IC Engines and Nuclear Power Plants

Q1: The primary fuel used in nuclear power plants is

A U235

B U238

C Pu239

D Pu233

Q2: The detonation is also called knocking or pinking.

A Yes

B No

Q3: Each fission of U235 produces on the average __________ fast neutrons as a product of reaction.

A 2.46

B 24.6

C 246

D 2460

Q4: The object of supercharging the engine is

A to reduce mass ofthe engine per brake power

B to reduce space occupied by the engine

C to increase the power output of an engine when greater power is required

D all ofthe above

Q5: The pre-ignition occurs before the spark is produced whereas detonation develops after the introduction of spark.

A Agree

B Disagree

Q6: In a four stroke cycle petrol engine, the charge is compressed when both the valves (i.e. inlet valve and exit valve) are closed,

A Agree

B Disagree

Q7: The thermal efficiency of diesel engines on weak mixtures is

A unaffected

B lower

C higher

D dependent on other factors

Q8: The increase of cooling water temperature in petrol engine will __________ the knocking tendency.

A not effect

B decrease

C increase

Q9: The thermal efficiency of a standard Otto cycle for a compression ratio of 5.5 will be

A 25%

B 50%

C 70%

D 100%

Q10: The predominent isotope of the naturally occuring element is

A U235

B U238

C Pu233

D Pu239

Q11: The self ignition temperature of petrol is __________ as compared to diesel oil.

A same

B lower

C higher

Q12: The pressure inside the cylinder is __________ the atmospheric pressure during the exhaust stroke.

A equal to

B below

C above

Q13: The expansion of fuel in a four stroke cycle diesel engine

A starts at 15° before top dead centre and ends at 30° after top dead centre

B starts at top dead centre and ends at 30° after top dead centre

C starts at 15° after top dead centre and ends at 30° before bottom dead centre

D may start and end anywhere

Q14: In hit and miss governing, the fuel supply is cut-off completely during one or more number of cycles.

A Yes

B No

Q15: The reference fuels for knock rating of spark ignition engines would include

A iso-octane and alpha-methyl naphthalene

B normal octane and aniline

C iso-octane and normal hexane

D normal heptane and iso-octane

Q16: In diesel engines, the fuel is injected in the form of very fine spray, into the engine cylinder, which gets ignited due to high temperature of the compressed air.

A Agree

B Disagree

Q17: The detonating tendency in petrol engines increases with increase of compression ratio.

A True

B False

Q18: The energy released during the fission of one atom of Uranium - 235 in million electron volts is about

A 100

B 200

C 300

D 400

Q19: The purpose of testing an internal combustion engine is

A to determine the information, which can not be obtained by calculations

B to conform the data used in design, the validity of which may be doubtful

C to satisfy the customer regarding the performance of the engine

D all of the above

Q20: Where reactor operation is designed with fast neutrons such as in reactors using highly enriched fuel, the moderator used is

A heavy water

B graphite

C carbon dioxide

D no moderator is needed

Q21: In a four stroke cycle, the minimum temperature inside the engine cylinder occurs at the

A beginning of suction stroke

B end of suction stroke

C beginning of exhaust stroke

D end of exhaust stroke

Q22: In open combustion chamber in diesel engines, the shape and layout of the piston crown, the inlet port and the valve produce the turbulent effect of fuel mixture.

A True

B False

Q23: Ordinary water is sometimes used as moderator when enriched uranium is used as a fuel in nuclear power plants.

A Yes

B No

Q24: The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the

A jet area is automatically varied depending on the suction

B the flow from the main jet is diverted to the compensating jet with increase in speed

C the diameter of the jet is constant and the discharge coefficient is invariant

D flow is produced due to the static head in the float chamber

Q25: The exhaust valve in a four stroke cycle petrol engine

A opens at 50° before bottom dead centre and closes at 15° after top dead centre

B opens at bottom dead centre and closes at top dead centre

C opens at 50° after bottom dead centre and closes at 15° before top dead centre

D may open and close anywhere

Q26: Pre-ignition is caused by the spontantaneous combustion of the mixture before the end of the compression stroke, and is due to

A cylinder walls being too hot

B overheated spark plug points

C red hot carbon deposits on cylinder walls

D any one of these

Q27: The basic requirement of a good combustion chamber is

A minimum turbulence

B low compression ratio

C high thermal efficiency and power output

D low volumetric efficiency

Q28: Morse test can be conducted for

A petrol engines

B diesel engines

C multi-cylinder engines

D all of these

Q29: In a diesel engine, the duration between the time of injection and ignition, is known as

A pre-ignition period

B delay period

C period of ignition

D burning period

Q30: The nuclear power station at Tarapur has the reactor of the __________ type.

A pressurized water

B boiling water

C gas cooled

D liquid metal cooled

Q31: In nuclear power plants, due to reflector, less fuel is needed to generate sufficient neutrons to sustain a chain reaction.

A Yes

B No

Q32: The brake power of a diesel engine, keeping other parameters constant, can be increased by

A decreasing the density of intake air

B increasing the temperature of intake air

C increasing the pressure of intake air

D decreasing the pressure of intake air

Q33: U233 is produced

A artificially

B as basic raw material

C when thorium is irradiated by neutrons

D by fission of U238

Q34: Nuclear reactors are used

A to produce heat for thermoelectric power

B to produce fissionable material

C to propel ships, submarines, aircrafts

D all of these

Q35: A carburettor is used to supply

A petrol, air and lubricating oil

B air and diesel

C petrol and lubricating oil

D petrol and air

Q36: The pressure at the end of compression, in diesel engines, is approximately

A 10 bar

B 20 bar

C 25 bar

D 35 bar

Q37: A moderator generally used in nuclear power plants is

A graphite

B heavy water

C concrete

D graphite and concrete

Q38: The effective inhibitor of pre-ignition is

A alcohol

B water

C lead

D none of these

Q39: The ratio of the volume of charge admitted at N.T.P. to the swept volume of the piston is called

A mechanical efficiency

B overall efficiency

C volumetric efficiency

D relative efficiency

Q40: The diesel engines are also known as __________ engines.

A compression ignition

B spark ignition

Q41: A moderator, in nuclear power plants, is a medium introduced into the fuel mass in order to

A slow down the speed of fast moving neutrons

B control the reaction

C reduce the temperature

D extract heat from nuclear reaction

Q42: The thermal efficiency of diesel engines is about

A 15%

B 30%

C 50%

D 70%

Q43: Reactors for propulsion applications are designed for

A any form of uranium

B natura uranium

C enriched uranium

D plutonium

Q44: In a four stroke cycle petrol engine, the charge is ignited at

A 30° before top dead centre

B 30° after top dead centre

C 30° before bottom dead centre

D 30° after bottom dead centre

Q45: High speed compression engines operate on

A Otto cycle

B Diesel cycle

C Dual-combustion cycle

D all of these

Q46: A diesel engine has

A one valve

B two valves

C three valves

D four valves

Q47: In petrol engine, using a fixed octane rating fuel and fixed compression ratio, supercharging will __________ the knocking tendency.

A not effect

B decrease

C increase

Q48: The secondary fuel used in nuclear power plants is

A U233 and Pu239

B U235 and Th232

C U235 and Pu238

D U233 and Pu238

Q49: The injection pressure in a diesel engine is about

A 10 bar

B 100 bar

C 150 bar

D 500 bar

Q50: In a four stroke cycle petrol engine, the inlet valve

A opens at top dead centre and closes at bottom dead centre

B opens at 20° before top dead centre and closes at 40° after bottom dead centre

C opens at 20° after top dead centre and closes at 20° before bottom dead centre id) may open or close anywhere

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