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Download free mechanical engineering paper wise pdf ebook. Mechanical engineering principles, 3rd edition free pdf download here. Mechanical engineering objective r k jain. Mechanical engineering objective book by r k jain free. Refrigeration and air conditioning rac. The same volume of all gases would represent their a densities b specific weights c molecular weights d gas characteristic constants e specific gravities.
Which law states that the specific heat of a gas remains constant at all temperatures and pressures a Charles' Law b Joule's Law c Regnault's Law d Boyle's Law e there is no such law. An open system is one in which a mass does not cross boundaries of the system, though energy may do so b neither mass nor energy crosses the boundaries of the system c both energy and mass cross the boundaries of the system d mass crosses the boundary but not the energy e thermodynamic reactions do not occur.
Gases have a only one value of specific heat b two values of specific heat Like our facebook Page: According to Avogadro's Hypothesis a the molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature b the sum of partial pressure of mixture of two gases is sum of the two c product of the gas constant and the molecular weight of an ideal gas is constant d gases have two values of specific heat e all systems can be regarded as closed systems.
Extensive property of a system is one whose value a depends on the mass of the system like volume b does not depend on the mass of the system, like temperature, pressure, etc. The statement that molecular weights of all gases occupy the same volume is known as a Avogadro's hypothesis b Dalton's law c Gas law d Law of thermodynamics e Joule's law.
To convert volumetric analysis to gravimetric analysis, the relative volume of each constituent of the flue gases is a divided by its molecular weight b multiplied by its molecular weight c multiplied by its density d multiplied by its specific weight e divided by its specific weight.
If a gas is heated against a pressure, keeping the volume constant, then work done will be equal to Like our facebook Page: An isolated system is one in which a mass does not cross boundaries of the system, though energy may do so b neither mass nor energy crosses the boundaries of the system c both energy and mass cross the boundaries of the system d mass crosses the boundary but not the energy e thermodynamic reactions do not occur.
Properties of substances like pressure, temperature and density, in thermodynamic coordinates are a path functions b point functions c cyclic functions d real functions e thermodynamic functions. Which of the following quantities is not the property of the system a pressure b temperature c specific volume d heat e density. According to Avogadro's law, for a given pressure and temperature, each molecule of a gas a occupies volume proportional to its molecular weight b occupies volume proportional to its specific weight c occupies volume inversely proportional to its molecular weight d occupies volume inversely proportional to its specific weight e occupies same volume.
Mixture of ice and water form a a closed system b open system c isolated system d heterogeneous system e thermodynamic system. Which of the following is the property of a system Like our facebook Page: On weight basis, air contains following parts of oxygen a 21 b 23 c 25 d 73 e Which of the following is not the intensive property a pressure b temperature c density d heat e specific volume.
Which of the following items is not a path function a heat b work c kinetic energy d vdp e thermal conductivity. Work done in an adiabatic process between a given pair of end states depends on a the end states only b particular adiabatic process c the value of index n d the value of heattransferred e mass of the system.
Heat and work are a point functions b system properties c path functions d intensive properties e extensive properties. Which of the following parameters is constant for a mole for most of the gases at a given temperature and pressure a enthalpy Like our facebook Page: Solids and liquids have a one value of specific heat ft two values of specific heat c three values of specific heat d no value of specific heat e one value under some conditions and two values under other conditions.
Curve A in Fig. The index of compression n tends to reach ratio of specific heats y when a flow is uniform and steady Like our facebook Page: Change in enthalpy of a system is the heat supplied at a constant pressure b constant temperature c constant volume d constant entropy e N.
The term N. A heat exchange process in which the product of pressure and volume remains constant is known as a heat exchange process b throttling process c isentropic process d adiabatic process e hyperbolic process. Zeroth law of thermodynamics a deals with conversion of mass and energy b deals with reversibility and irreversibility of process c states that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other d deals with heat engines e does not exist.
The basis for measuring thermodynamic property of temperature is given by a zeroth law of thermodynamics b first law of thermodynamics c second law of thermodynamics d third law of thermodynamics e Avogadro's hypothesis. Work done is zero for the following process a constant volume b free expansion c throttling d all Of the above e none of the above. For which of the following substances, the gas laws can be used with minimum error a dry steam b wet steam c saturated steam d superheated steam e steam at atmospheric pressure.
The value of the product of molecular weight and the gas characteristic constant Like our facebook Page: On volume basis, air contains following parts of oxygen a 21 b 23 c 25 d 77 e Universal gas constant is defined as equal to product of the molecular weight of the gas and a specific heat at constant pressure b specific heat at constant volume c ratio of two specific heats d gas constant e unity.
The value of the product of molecular weight and the gas characteristic constant for all the gases in S. For which of the following substances, the internal energy and enthalpy are the functions of temperature only a any gas b saturated steam c water d perfect gas e superheated steam. In a free expansion process a work done is zero b heat transfer is zero c both a and b above d work done is zero but heat increases e work done is zero but heat decreases. If a gas vapour is allowed to expand through a very minute aperture, then such a process is known as a free expansion b hyperbolic expansion c adiabatic expansion d parabolic expansion e throttling.
The specific heat of air increases with increase in a temperature b pressure c both pressure and temperature d variation of its constituents e air flow Ans: If a fluid expands suddenly into vacuum through an orifice of large dimension, then such a process is called a free expansion b hyperbolic expansion c adiabatic expansion d parabolic expansion e throttling.
Which of the following processes is irreversible process a isothermal b adiabatic c throttling d all of the above e none of the above. For a thermodynamic process to be reversible, the temperature difference between hot body and working substance should be a zero b minimum d maximum d infinity e there is no such criterion. Minimum work in compressor is possible when the value of adiabatic index n is equal to a 0. A gas is compressed in a cylinder by a movable piston to a volume one-half its original volume.
During the process kJ heat left the gas and internal energy remained same. The more effective way of increasing efficiency of Carnot engine is to a increase higher temperature b decrease higher temperature c increase lower temperature d decrease lower temperature e keep lower temperature constant.
Entropy change depends on a heat transfer Like our facebook Page: For reversible adiabatic process, change in entropy is a maximum b minimum c zero d unpredictable e negative.
Isochoric process is one in which a free expansion takes place b very little mechanical work is done by the system c no mechanical work is done by the system d all parameters remain constant e mass and energy transfer do not take place.
According to first law of thermodynamics a work done by a system is equal to heat transferred by the system b total internal energy of a system during a process remains constant c internal energy, enthalpy and entropy during a process remain constant d total energy of a system remains constant e entropy of a system remains constant.
Energy can neither be created nor destroyed but can be converted from one form to other is inferred from a zeroth low of thermodynamic b first law of thermodynamics c second law to thermodynamics d basic law of thermodynamics e claussius statement. First law of thermodynamics furnishes the relationship between a heat and work b heat, work and properties of the system c various properties of the system d various thermodynamic processes e heat and internal energy.
Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant a pressure Like our facebook Page: In an isothermal process, the internal energy a increases b decreases c remains constant d first increases and then decreases e first decreases and then increases.
Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant a pressure b temperature c volume d internal energy e entropy. According to first law of thermodynamics a mass and energy are mutually convertible b Carnot engine is most efficient c heat and work are mutually convertible d mass and light are mutually convertible e heat flows from hot substance to cold substance.
Total heat of a substance is also known as a internal energy b entropy c thermal capacity d enthalpy e thermal conductance. First law of thermodynamics a enables to determine change in internal energy of the system b does not help to predict whether the system will or not undergo a change c does not enable to determine change in entropy d provides relationship between heat, work and internal energy e all of the above.
Addition of heat at constant pressure to a gas results in a raising its temperature b raising its pressure Like our facebook Page: Carnot cycle has maximum efficiency for a reversible engine b irreversible engine c new engine d petrol engine e diesel engine. Measurement of temperature is based on a thermodynamic properties b zeroth law of thermodynamics c first law of thermodynamics d second law of thermodynamics e joule's law. If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly a temperature b enthalpy Like our facebook Page: If a system after undergoing a series of processes, returns to the initial state then a process is thermodynamically in equilibrium b process is executed in closed system cycle c its entropy will change due to irreversibility d sum of heat and work transfer will be zero e no work will be done by the system.
An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is a feasible b impossible c possible d possible, but with lot of sophistications e desirable.
A manufacturer claims to have a heat engine capable of developing 20 h. His claim is a justified b not possible c may be possible with lot of sophistications d cost will be very high e theroretically possible. In a Carnot cycle, heat is transferred at a constant pressure b constant volume c constant temperature d constant enthaply e any one of the above.
A diathermic wall is one which a prevents thermal interaction Like our facebook Page: An adiabatic wall is one which a prevents thermal interaction b permits thermal interaction c encourages thermal interaction d discourages thermal interaction e dos not exist. The door of a running refrigerator inside a room was left open. Which of the following statements is correct? Water contained in a beaker can be made to boil by passing steam through it a at atmospheric pressure b at a pressure below the firuosphejric pressure c at a pressure greater than atmospheric pressure d any pressure e not possible.
During throttling process a heat exchange does not take place b no work is done by expanding steam c there is no change of internal energy of steam d all of the above e entropy decreases.
The energy of molecular motion appears as a heat Like our facebook Page: A sudden fall in the barometer reading is a sign of approaching a fine weather b rains c storm d cold wave e hot wave. Calorie is a measure of a specific heat b quantity of heat c thermal capacity d entropy e work. Barometric pressure is equal to a mm Hg b zero mm Hg c The first law of thermodynamics is the law of a conservation of mass b conservation of energy c conservation of momentum d conservation of heat e conservation of temperature.
A perpetual motion machine is a a thermodynamic machine b a non-thermodynamic machine c a hypothetical machine d a hypothetical machine whose opera-tion would violate the laws of thermodynamics e an inefficient machine. Kelvin Planck's law deals with a conservation of heat b conservation of work c conversion of heat into work d conversion fo work into heat e conservation of mass.
According to Clausis statement of second law of thermodynamics a heat can't be transferred from low temperature source to high temperature source b heat can be transferred for low temperature to high temperature source by using refrigeration cycle. Thermal power plant works on a Carnot cycle b Joule cycle d Rankine cycle d Otto cycle e Brayton cycle. Which of the following is an irreversible cycle Like our facebook Page: Otto cycle consists of following four processes a two isothermals and two isentropics b two isentropics and two constant volumes c two isentropics, one constant volume and one constant pressure d two isentropics and two constant pres-sures e none of the above.
The efficiency of a Carnot engine depends on a working substance b design of engine c size of engine d type of fuel fired e temperatures of source and sink. For same compression ratio and for same heat added a Otto cycle is more efficient than Diesel cycle b Diesel cycle is more efficient than Otto cycle c efficiency depends on other factors d both Otto and Diesel cycles are equally efficient e none of the above.
The efficiency of Carnot cycle is maximum for a gas engine b well lubricated engine c petrol engine d steam engine e reversible engine. Carnot cycle is a a reversible cycle ft an irreversible cycle c a semi-reversible cycle d a quasi static cycle e an adiabatic irreversible cycle.
Diesel cycle consists of following four processes a two isothermals and two isentropics b two isentropics, and two constant volumes. If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle a more b less c equal d depends on other factors e none of the above.
Stirling and Ericsson cycles are a reversible cycles b irreversible cycles c quasi-static cycles d semi-reversible cycles e adiabatic irreversible cycles. A cycle consisting of two adiabatics and two constant pressure processes is known as a Otto cycle b Ericsson cycle c Joule cycle d Stirling cycle e Atkinson cycle. Brayton cycle consists' of following four processes a two isothermals and two isentropics b two isentropics and two constant volumes c two isentropics, one constant volume and one constant pressure d two isentropics and two constant pres-sures e none of the above.
Which of the following cycles is not a reversible cycle a Carnot b Ericsson c Stirling Like our facebook Page: The cycle in which heat is supplied at constant volume and rejected at constant pressure is known as a Dual combustion cycle b Diesel cycle c Atkinson cycle d Rankine cycle e Stirling cycle.
The efficiency of Diesei cycle with decrease in cut off a increases b decreases c remains unaffected d first increases and then decreases e first decreases and then increases. Which of the following cycles has maximum efficiency a Rankine b Stirling c Carnot d Brayton e Joule. The following cycle is used for air craft refrigeration a Brayton cycle b Joule cycle Like our facebook Page: Gas turbine cycle consists of a two isothermals and two isentropics b two isentropics and two constant volumes c two isentropics, one constant volume and one constant pressure d two isentropics and two constant pressures e none of the above.
The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that a carnot cycle can't work with saturated steam b heat is supplied to water at temperature below the maximum temperature of the cycle c a rankine cycle receives heat at two places d rankine cycle is hypothetical e none of the above.
Engines Questions and Answers pdf free download 1. In a diesel engine, the fuel is ignited by a spark b injected fuel c heat resulting from compressing air that is supplied for combustion d ignition e combustion chamber. Scavenging air in diesel engine means a air used for combustion sent under pres-sure Like our facebook Page: Supercharging is the process of a supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere b providing forced cooling air c injecting excess fuel for raising more load d supplying compressed air to remove combustion products fully e raising exhaust pressure.
Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged? The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called a net efficiency b efficiency ratio c relative efficiency d overall efficiency e cycle efficiency.
Compression ratio of LC. The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is a same b less c more d more or less depending on power rating e unpredictable. If the intake air temperature of I. All heat engines utilize a low heat value of oil b high heat value of oil c net claorific value of oil d calorific value of fuel e all of the above.
An engine indicator is used to determine the following a speed b temperature c volume of cylinder d m. Fuel oil consumption guarantees for I. In case of gas turbines, the gaseous fuel consumption guarantees are based on a high heat value b low heat value c net calorific value d middle heat value e calorific value. The maximum temperature in the I.
The thermal efficiecny of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will a increase b decrease c be independent d may increase or decrease depending on other factors e none of the above. Like our facebook Page: Pick up the wrong statement a 2-stroke engine can run in any direction b In 4-stroke engine, a power stroke is obtained in 4-strokes c thermal efficiency of 4-stroke engine is more due to positive scavenging d petrol engines work on otto cycle e petrol engines occupy more space than diesel engines for same power output.
Combustion in compression ignition engines is a homogeneous b heterogeneous c both a and b d laminar e turbulent. The specific fuel consumption per BHP hour for diesel engine is approximately a 0. Crankcase explosion in I. Compression loss in I. C engines occurs duto a leaking piston rings b use of thick head gasket c clogged air-inlet slots d increase in clearance volume caused b bearing-bushing wear e all of the above.
The specific fuel consumption per BH hour for a petrol engine is approximately a 0. The air requirement of a petrol engine during starting compared to theoretical airequired for complete combustion is a more b loss c same d may be more or less depending on engine capacity e unpredictable.
The inlet value of a four stroke cycle I. Which of the following is not an interns combustion engine a 2-stroke petrol engine b 4-stroke petrol engine c diesel engine d gas turbine e steam turbine.
If one cylinder of a diesel engine receives more fuel than the others, then for that cylinder the a exhaust will be smoky b piston rings would stick into piston grooves c exhaust temperature will be high d engine starts overheating e scavenging occurs.
The output of a diesel engine can be increased without increasing the engine revolution or size in following way a feeding more fuel b increasing flywheel size c heating incoming air d scavenging e supercharging. It the temperature of intake air in IC engines is lowered, then its efficiency will a increase b decrease c remain same d increase upto certain limit and then decrease e decrease upto certain limit and then in-crease.
For the same compression ratio a Otto cycle is more efficient than the Diesel b Diesel cycle is more efficient'than Otto c both Otto and Diesel cycles are, equally efficient d compression ratio has nothing to do with efficiency e which is more efficient would depend on engine capacity. The precess of breaking up or a lipuid into fine droplets by spraying is called a vaporisation b carburetion c ionisation d injection e atomisation. As a result of detonation in an I. Most high speed compression engines operate on a Diesel cycle b Otto cycle c Dual combustion cycle d Special type of air cycle e Carnot cycle.
The accunmulation of carbon in a cylinder results in increase of a clearance volume b volumetric efficiency c ignition time d effective compression ratio e valve travel time. Which of the following medium is compressed in a Diesel engine cylinder a air aione b air and fuel c air and lub oil d fuel alone e air, fuel and lub oil. The air-fuel ratio of the petrol engine is controlled by a fuel pump b governor c injector d carburettor Like our facebook Page: Diesel fuel, compared to petrol is a less difficult to ignite b just about the same difficult to ignite c more difficult to ignite d highly ignitable e none of the above.
When crude oil is heated, then which of the following hydrocarbon is given off first. The rating of a diesel engine, with increase in airintlet temperature, will a increase linearly b decrease linearly c increase parabolically d decrease parabolically e first decrease linearly and then increase parabolically.
A 75 cc engine has following parameter as 75 cc a fuel tank capacity b lub oil capacity c swept volume Like our facebook Page: A heat engine utilises the a calorific value of oil b low heat value of c high heat value of oil d mean heat value of oil e all of the above. Gaseous-fuel guarantees are based on a calorific value of oil b low heat value of oil c high heat value of oil d mean heat value of oil e all of the above. Fuel consumption of diesef engines is not guaranteed at one quarter load because at such low loads a the friction is high b the friction is unpredictable c the small difference in cooling water temperature or in internal friction has a disproportionate effect d the engine is rarely operated e none of the above.
Polymerisation is a chemical process in which molecules of a compound become a larger b slowed down c smaller d liquid e gaseous. The term scavenging is generally associated with a 2-stroke cycle engines b 4-stroke cycle engines c aeroplane engines d diesel engines e high efficiency engines. In diesel engine, the compression ratio in comparison to expansion ratio is a same b less G more Like our facebook Page: The cam shaft of a four stroke I.
Engine pistons 'are usually made of aluminium alloy because it a is lighter b wears less c absorbs shocks d is stronger e does not react with fuel and lub oil.
Most high speed compression engines operate on a Otto cycle b Diesel cycle c Dual cycle d Carnot cycle e Two stroke cycle.
The specific fuel consumption of a petrol engine compared to diesel engine of same H. A diesel engine as compared to petrol engine both running ar rated load is a more efficient b less efficient c equally efficient d unperdictable e other factors will decide it.
The size of inlet valve of. In a cycle, the spark lasts roughly for a 1 sec b 0. Which of the following is false statement: Excess quantities of sulphur in diesel fuel are Objectionable because it may cause the following a piston ring and cylinder wear b formation of hard coating on piston skirts c oil sludge in the engine crank case d detonation e forms corrosive acids.
Which of the following is false statement. Some of the methods used to reduce diesel smoke are as follows a using additives in the fuel b engine derating i. The fuel air ratio in a petrol engine fitted with suction carburettor, operating with dirty air filter as compared to clean filter will be a higher b lower c remain unaffected d unpredictable e none of the above.
Pick up the wrong statement about supercharging a supercharging reduces knocking in diesel engines b there can be limited supercharging in petrol engines because of detonation c supercharging at high altitudes is essential d supercharging results in fuel economy e supercharging is essential in aircraft engines.
The actual volume of fresh charge admitted in 4-stroke petrol engine is a equal to stroke volume b equal to stroke volume and clearance volume Like our facebook Page: The magneto in an automobile is basically c transformer b d. The reason for supercharging in any engine is to a increase efficiency b increase power c reduce weight and bulk for a given out-put d effect fuel economy e none of the above.
The operation of forcing additional air under pressure in the engine cylinder is known as a scavenging b turbulence c supercharging d pre-ignition e dissociation and carburretion of fuel. Supercharging is essential in a diesel engines b gas turbines c petrol engines d aircraft engines e marine engines.
The minimum cranking speed in case of petrol engine is about a half the operating speed b one-fourth of operating speed c rpm d rpm e rpm Ans: The mean effective pressure obtained from engine indicator indicates the a maximum pressure developed b minimum pressure c instantaneous pressure at any instant d exhaust pressure e average pressure.
For the same power developed in I. Scavenging is usually done to increase a thermal efficiency b speed c power output d fuel consumption e all of the above. Which of the following is the lightest and most volatile liquid fuel a diesel b kerosene c fuel oil d gasoline e lub oil.
The theoretically correct air fuel ratio for petrol engine is of the order of a 6: Air fuel ratio for idling speed of a petrol engine is approximately a 1: Air fuel ratio at which a petrol engine can not work is a 8: For maximum power generation, the air fuel ratio for a petrol engine for vehicles, is of the order of a 9: The following volume of air is required for consuming 1 liter of fuel by a four stroke engine a 1 m3 b 5 m3 c m3 d m3 e m3.
A 5 BHP engine running at full load would consume diesel of the order of a 0. Diesel engine can work on very lean air fuel ratio of the order of A petrol engine can also work on such a lean ratio provided a it is properly designed b best quality fuel is used c can not work as it is impossible d flywheel size is proper e engine cooling is stopped.
A diesel engine has a 1 valve b 2 valves b 3 valves d 4 valves e no valve. The knock in diesel engine occurs due to a instantaneous and rapid burning of the first part of the charge b instantaneous atuo iginition of last part of charge c delayed burning of the first part of the charge d reduction of delay period e all ot the above.
A stoichiometric air-fuel ratio is a chemically correct mixture b lean mixture c rich mixture for idling d rich mixture for over loads e the ratio used at full rated parameters. In a naturally aspirated diesel engine, the air is supplied by a a supercharger b a centrifugal blower c a vacuum chamber d an injection tube e forced chamber Like our facebook Page: In loop scavenging, the top of the piston is a flat b contoured c slanted d depressed e convex shaped.
In the crankcase method of scavenging, the air pressure is produced by a supercharger b centrifugal pump c natural aspirator d movement of engine piston e reciprocating pump. Ignition quailty of petrol is expressed by a octane number b cetane number c calorific value d self ignition temperature e distillation temperature.
Iso-oct ,ne a has octane number of 0 b has octane number of 50 c has octane number of d is an index of detonation quality e is an index of knocking quality. Octane number is determined by comparing the performance of the petrol with the following hydrocarbons a iso-octane b mixture of normal heptane and iso-oc-tane c alpha methyl napthalene d mixture of methane and ethane e mixture of paraffins and aromatics. Cetane a has zero cetane number b has cetane number c helps detonation d is a straight chain paraffin e determines the efficiency of an I.
Ethyl fluid is used a to increase the octane rating of the fuel b to increase the cetane rating of the fuel c as a defrosting agent d as a superior type of fluid compared to others e to improve lubricating quality of fuel. The self-ignition temperature of diesel oil compared to petrol is a higher b lower c same d depends on quality of fuel e unpredictable?
Normal heptane a accelerates auto-ignition Like our facebook Page: Cetane number is determined by comparing the performance of diesel oil with the following hydrocarbons a cetane b mixture of cetane and alphamethyl napthalene c ethylene dibromide d mixture of aldehydes and ketones e mixture of cetane with tetra-ethyl lead Which is correct statement about reaction time for autoignition of fuel and the fuel air ratio a lean mixture has high reaction time b rich mixture has high reaction time c chemically correct mixture has mini-mum reaction time d all of the above.
Violent sound pulsations within the cylinder of an I. Ignition lag is a the time taken by fuel after injection before top dead center to reach upto auto- ignition temperature b time before actual fuel injection and the pump plunger starts to pump fuel c time corresponding to actual injection and top dead center d time corresopnding to actual ingition and top dead center e none of the above.
The spark plug gap is normally maintained at a 0. The function of a fuel pump in a petrol pump is to a inject fuel in cylinder b supply fuel when carburettor fails c pump fuel so that it reaches carburettor to improve thermal efficiency d does not exist. The delay period in petrol engine is of the order of a 0. Detonation is caused by the following unstable compounds a peroxides, aldehydes and ketones b peroxides, aldehydes, oxides and sul-phides c aldehydes, oxides and ketones d ketones and sulphur compounds e none of the above.
Which is false statement about advantages of V-type engine a compact design requiring lesser space b improved distribution of air to cylinder c casting less liable to distortion d reduced torsional vibration because of shorter crankshaft e less overhead clearance. The pistons are usually given a coating such as tin plating in order to a reduce weight b conduct heat efficiently c reduce possibility of scoring d reduce friction e increase lubrication effect.
Piston rings are usually made of a cast iron b aluminium c phosphor bronze d babbitt e carbon steel. Piston rings are plated with chromium,cadmium or phosphate in order to a reduce cost b improve surface finish c prevent clogging d reduce wear and eliminate scuffing e improve heat transfer. The top piston ring nearer to the piston crown is known as a compression ring b oil ring c scrapper ring d groove ring e leading ring.
In order to prevent knock in the S. Diesel engines have low specific fuel consumption compared to petrol engine. This statement is a not true b true at full load c true at part load d true at both part and full load e there could not be any such criterion. To reduce the possibility of knock in the C. The detonation tendency in petrol engines for specified conditions of fuel rating, compression ratio, speed etc. According to Recardo's theory, detonation occurs due to a instantaneous auto-ignition of last part of charge to be burnt b improper mixing of air and fuel Like our facebook Page: A fuel will detonate less if it has a higher self ignition temperature b lower self ignition temperature c proper self ignition temperature d self ingition temperature has nothing to do with detonation e none of the above.
The knocking in diesel engines for given fuel, will be a enhanced by increasing compression ratio b enhanced by decreasing compression ratio c unaflected by compression ratio d first enhanced by increasig compression ratio upto a limit beyond which it will be suppressed e dependent on other factors. Injection lag is a the time taken by fuel after injection before top dead center to reach upto auto- ignition temperature b time before actual fuel injection and the pump pluger starts to pump fuel c time corresponding to actual injection and top dead center d time corresponding to actual ignition and top dead center e none of the above.
Ignition quality of diesel-fuel oil is expressed by an index called a octane number b cetane number c calorific value d carbon content e ignition temperature. For best results of efficient combustion, high speed diesel engines need an approximate cetane number of a b 10 c 50 d 5 e 1.
The most popular firing order in case of four cylinder in-line I. The specific gravity of diesel oil Is a 1 b 0. The specific gravity of petrol is about a 0. Pick up the correct statement. Detonation can be controlled by Like our facebook Page: The efficiency of I. The firing order in a six stroke I. The m. High carbon content in diesel oil used for diesel engine leads to Like our facebook Page: Exhaust pipes of engines are covered with insulating marterial in order to a keep the exhaust pipes warm b reduce formation of condenstae c reduce heat transfer to the engine room d increase engine efficiency e conserve heat.
Ignition timing of a multicylider petrol engine can be adjusted by a rotating the crank b adjusting the spark plug gap c adjusting ignition coil position d rotating the distributor e delaying the spark by increasing capacitor in ignition circuit.
Fuel consumption with increase in back pressure will a increase b decrease c remain unaffected d depend on other factors e none of the above. The cooling water requirement for diesel engine is of the order of a 0. A 4-stroke diesel engine needs about following amount of air a 75 cc per min.
Leakage past the piston rings and valve seats in I. With increa. The ratio of useful power; engine friction exhaust gas losses; cooling water, air and oil losses for a diesel engine is of the order of a 5: For same power and same speed, the flywheel of a four stroke engine as compared to two-stroke I.
Air injection in I. Solid injection in I. The specific fuel consumption for a petrol engine first decreases with increase in fuel air ratio and then increases with further increase in fuel air ratio.
The minimum value occurs in the range of a lean mixture b chemically correct mixture c rich mixture d unpredictable e none of the above. The thermal efficiency of a two cycle engine as compared to four cycle engine is a more b less c same d more upto some load and then less e it may be less or more depending on several other factors. Diesel engines as compared to petrol engines require a bigger flywheel b smaller flywheel c same size flywheel d no flywheel e flywheel whose size may be less or more depending on several other fac-tors.
The tendency of a diesel engine to knock increases, if a engine speed is increased b engine H. The tendency of a petrol engine to knock increases by a supercharging b scavenging Like our facebook Page: P, d reducing the spark advance e increasing cetane number of fuel.
Free acids in diesel oil for diesel engine lead to a production of highly corrosive gases corroding the cylinder walls and exhaust system b excessive engine wear c damaging of both the storage tank and the engine d deposition on engine parts e excessive fuel consumption. The thermostat in I. The brake mean effective pressure of an I. High ash and sediment in diesel oil used in diesel engine lead to a production of highly corrosive gases corroding the cylinder walls and ex-haust system b excessive engine wear c damaging of both the storage tank and the engine d deposition on engine parts e blocking of exhaust pipes.
Mixing of fuel and air in case of dies engine occurs in a injection pump b injector c inlet manifold d carburettor e engine cylinder. The advantage of reversing the flow of a in an air cleaner is to a increase velocity of air b increase air flow c reduce the velocity of air d throw out a large percentage of foreig matter e cool the air. Fins are provided over engine cylinder scooters for a higher strength of cylinder b better cooling c good appearance d higher efficiency e easier handling and ease in manufacturing.
The elements of most concern in regard pollution caused by engines are a CO and C02 b CO and hydrocarbons c C02 and hydrocarbons d carbon and dust e hot products of combustion The preferred location of an oil cooler is a before the filters b after the filters c between the filters d before and after the filters e any where. The petrol from tank to the automotive ergine is fed by a gravity b pump run by engine c suction pressure created by, suctio stroke d capillary action e fuel pump.
In petrol engine, increase of cooling water temperature will a increase the knocking tendency b decrease the knocking tendecny c not affect the knocking tendency d increase or decrease knocking tendency depedning on strength and time of spark e unpredictable.
In carburettors, the top of the fuel jet with reference to the level in the float Like our facebook Page: Carburretion is done to a feed petrol into cylinder b govern the engine c break up and mix the petrol with air d heat up the charge to cylinder e scavenge the cylinder.
Power impulses from an I. The theoretically correct mixture of air and petrol is approximately a 8: The following type of carburettor is preferred a concentric type b eccentric type c horizontal type d vertical type e none of the above.
In the passanger cars, the following type of carburettor is preferred a horizontal type b downward draught type c upward draught type c inclined draught type e any one of the above types. The essential equipment for producing high vlotage for sparking in petrol engines with battery is a ignition coil b ignition coil and distributor c ignition coil and condenser d ignition coil and contact breaker e ignition coil, contact breaker and con-denser. The ignition coil in diesel engines produces voltage of the order of a 6 to 12 volts b volts c volts d 20, volts e 80, volts.
If the door of a diesel engine crankcase is opened just after shutdown before cooling of engine, then a efficiency of engine will be poor b there is a risk of explosion taking place c it is the safest practice d some parts may be subjected e some lub oil may be wasted.
Theoretically, the following engine should have maximum efficiency a gas engine b 2-stroke S. In petrol engine using a fixed octane rating fuel and fixed compression ratio, super charging will a increase the knocking tendency b decrease the knocking tendency c not affect the knocking tendency d increase or decrease knocking tendency depending on strength and time of spark e unpredictable. High sulphur content in diesel oil used for diesel engines leads to a production of highly corrosive gases corroding the cylinder walls and exhaust system b excessive engine wear c damaging of both the storage tank and the engine d deposition on engine parts e reduction in thermal efficiency.
The basic requirement of a good combustion chamber is a high compression ratio b low compression ratio c low volumetric efficiency d minimum turbulence e high power output and high thermal efficiency.
Deposition of carbon in petrol engine cylinder would result in increase of a clearance volume b swept volume c compression ratio d volumetric efficiency e mean effective pressure. Which of the following engines can work on very lean mixture a S.
If petrol is used in a diesel engine, then Like our facebook Page: In turbulence chamber in diesel engine a the shape and layout of the piston crown, the inlet port, and the valve produce the turbulent effect of fuel mixture b fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat c only a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency mixes thoroughly into main cylinder charge d there are no valves e fuel is partly burnt by spark.
For low load operation, more suitable economical engine is a S. A two stroke crank compressed engine has following ports in the cylinder a suction port and exhaust port b transfer port only c suction port and transfer port d transfer port and exhaust port e suction port, exhaust port and transfer port.
For the same size and weight, a two stroke engine as compared to four stroke engine will generate power a about twice b about 0. A two stroke engine is usually identified by a size of flywheel b weight of engine c type of lubrication system Like our facebook Page: If diesel is fed by mistake in the oil tank of a petrol engien, then engine will a give lot of smoke b detonate c knock d not run e run for some time and then stop.
Method of governing used in petrol engine is a quantity governing b quality governing c combined governing d partial governing e hit and miss governing. Pick up false statement a For petrol and large gas engines, quantity governingds preferred b In quantity governing, air fuel ratio is almost constant and quantity of charge is changed depending on load c In hit and miss governing, fuel supply is completely cut off during one or more number of cycles d In quality governing, quantity of fuel is varied to suit the load and total charge of air is varied e For close regulation of speed, combination of both quality and quantity governing is used.
Method of governing used in diesel engine is a quantity governing b quality governing c combined governing d partial governing e nit and miss governing. An engine has a normal speed of r. The efficiency of a nuclear power plant in comparsion to a conventional thermal power plant is a same b more c less d may be less or mote depending on size e unpredictable.
Isotopes of same elements have a same atomic number and different masses b same chemical properties but different atomic numbers c different masses and different atomic numbers d different chemical properties and same atomic numbers e same chemical properties and same atomic numbers. Atomic number of an element in the periodic table represents the numbers of a protons in the nucleus b electrons in me nucleus c neutrons in the nucleus d electrons in the atom e neutrons in the atom.
The mass number of a substance represents the sum of total number of Like our facebook Page: Which is not identical for an atom and an isotope a mass number b atomic number c chemical properties d position in periodic table e all of the above. A nuclear unit becoming critical means a it is generating power to rated capacity b it is capable of generating much more than rated capacity c there is danger of nuclear spread d chain reaction that causes automatic splitting of the fuel nuclei has been established e it generates no heat.
Moderator in nuclear plants is used to a reduce temperature b extract heat from nuclear reaction c control the reaction d cause collision with the fast moving neutrons to reduce their speed e moderate the radioactive pollution. The most commonly used moderator in nuclear plants is a heavy water b concrete and bricks c graphite and concrete d deutrium e graphite.
The nuclear energy is measured as a MeV Like our facebook Page: Breeder reactor has a conversion ratio of a unity b more than unity c less than unity d zero e infinity. Boiling water reactor employs a boiler b direct cycle of coolant system c double circuit system of coolant cycle d multi pass system e single circuit system. Fast breeder reactor uses a boiler b direct cycle of coolant system c double circuit system of coolant cycle d multi pass system e single circuit system.
One gram of uranium will produce energy equivalent to approximately a 1 tonne of high grade coal b 4. Which of the following nuclear reactor does not need a heat exchanger for generation of steam a gas cooled b liquid metal cooled Like our facebook Page: The number of isotopes of hydrogen are a 1 b 2 c U c 3 e 0 Ans: The commonly used material for shielding is a lead or concrete b lead and tin c graphite or cadmium d thick galvanised sheets e black carbon papers.
The main interest of shielding in nuclear reactor is protection against a X-rays b infra-red rays c a, P, and y rays d neutrons and gamma rays e electrons. Reflector in nuclear plants is used to a return the neutrons back into the core b shield the radioactivity completely c check polllution d conserve energy e is not used.
The energy required to be applied to a radioactive nucleus for the emission of a neutron is a 1 MeV b 2. Ferrite material is a the most fissionable material b the basic fuel for nuclear paints c basic raw material for nuclear plants d the material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material e none of the above. Which of the following particles is the lightest a nucleus b electron c proton d meson e neutron.
Which of the following is the heaviest a neutron b proton c atom d electron e nucleus. In fast breeder reactors a any type of moderator can be used b graphite is used as the moderator c heavy water is used as the moderator d moderator may or may not be used e moderator is dispensed with.
In nuclear fission each neutron that causes fission releases a no new neutron b at least one new neutron c one new neutron d more than one new neutrons Like our facebook Page: Gas cooled reactor uses following materials as moderator, and coolant a graphite, C02 b graphite, air c heavy water, C02 d lead, H2 e concrete, N2.
A nuclear fission produces energy of following order in MeV a 20 b c d 20, e 2 x The process by which a heavy nucleus is splitted into two light nuclei is known as a splitting b fission c fusion d disintegration e chain reaction.
A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is a same b more c less d there is no such criterion e none of the above. The fast breeder reactor uses the following moderator a demineralised water b carbon dioxide c heavy water d graphite Like our facebook Page: The nuclear power plant at Tarapur has the following reactor a fast breeder b pressurised water c boiling water d sodium graphite e none of the above.
Boiling water reactor uses the following as moderator, coolant and working fluid a ordinary fluid b heavy water c molten lead d hydrogen gas e none of the above. Ideally the neutron flux in reactor should be a maximum in center and zero at side b maximum at side and zero in center c uniform throughout d zero throughout e none of the above. U will undergo fission by a high energy fast neutrons alone b low energy slow neutrons alone c either fast or slow neutrons d medium energy neutrons e none of the above.
A reactor capable of converting a ferrite material into fissile isotopes is called a regenerative reactor b fast breeder reactor c breeder reactor d boiling water reactor e ferrite reactor. Hydrogen is preferred as better coolant in comparison to C02 because former a is lighter b is inert c has high specific heat d is a good conductor e all of the above.
Natural uranium is made up of a The risk of radioactive hazard is greatest in the turbine with following reactor a pressurised water b boiling water c gas cooled d liquid metal cooled e all of the above.
Plutonium is produced a as basic raw material b by neutron irradiation of Uz c by neutron irradiation of throium d artificially e in high capacity furnace.
Electron-volt is the unit of Like our facebook Page: