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MCQs 1: Leakage past the piston rings and valve seats in I.C. engines with increase in speed_______________?

increases decreases remains same unpredictable none of the above
Answer Explanation

MCQs 2: The cooling water requirement for diesel engine is of the order of________________?

0.2 to 1.0 liter per minute per h.p. 1 to 3 liters per minute per h.p. 5 to 10 liters per minute per h.p 10 to 20 liters per minute per h.p. 20-30 liters per minute per h.p
Answer Explanation

MCQs 3: Ignition timing of a multicylider petrol engine can be adjusted by_________________?

rotating the crank adjusting the spark plug gap adjusting ignition coil position rotating the distributor delaying the spark by increasing capacitor in ignition circuit
Answer Explanation

MCQs 4: High carbon content in diesel oil used for diesel engine leads to_________________?

production of highly corrosive gases corroding the cylinder walls and exhaust system excessive engine wear damaging of both the storage tank and the engine deposition on engine parts none of the above
Answer Explanation

MCQs 5: The pour point of diesel oil must be_________________?

lower than the coldest atmospheric temperature at which oil is to be pumped higher than above has no such relation more than 100°C none of the above
Answer Explanation

MCQs 6: In petrol engine, increase of cooling water temperature will_________________?

increase the knocking tendency decrease the knocking tendecny not affect the knocking tendency increase or decrease knocking tendency depedning on strength and time of spark unpredictable
Answer Explanation

MCQs 7: In petrol engines, the maximum power is developed corresponding to relative fuel air ratio of________________?

0.85 1 1.1 to 1.3 1.2 to 1.5
Answer Explanation

MCQs 8: In carburettors, the top of the fuel jet with reference to the level in the float chamber is kept at_________________?

same level slightly higher level slightly lower level may be anywhere varies from situation to situation
Answer Explanation

MCQs 9: Power impulses from an I.C. engine are somoothed out by__________________?

governor crank shaft gear box flywheel timing spark properly
Answer Explanation

MCQs 10: For low speed operation or for idling in petrol engines, the engine requirements are for_______________?

lean mixture theoretically correct mixture rich mixture any type of mixture lean/rich mixture depending upon capacity of engine
Answer Explanation

MCQs 11: The essential equipment for producing high vlotage for sparking in petrol engines with battery is_______________?

ignition coil ignition coil and distributor ignition coil and condenser ignition coil and contact breaker ignition coil, contact breaker and con-denser
Answer Explanation

MCQs 12: In petrol engines, advancing the spark timing will_______________?

increase the knocking tendency decrease the knocking tendency not affect the knocking tendncy increase or decrease knocking tendency depending on strenght and time of spark unpredictable
Answer Explanation

MCQs 13: The ignition coil in diesel engines produces voltage of the order of________________?

6 to 12 volts 240 volts 1000 volts 20,000 volts 80,000 volts
Answer Explanation

MCQs 14: The thermal efficiency of a diesel engine is of the order of_________________?

92% 68% 52% 34% 25%
Answer Explanation

MCQs 15: Theoretically, the following engine should have maximum efficiency________________?

gas engine 2-stroke S.I. engine 4-stroke S.I. engine steam engine 4-stroke C.I. engine
Answer Explanation

MCQs 16: In petrol engine using a fixed octane rating fuel and fixed compression ratio, super charging will_________________?

increase the knocking tendency decrease the knocking tendency not affect the knocking tendency increase or decrease knocking tendency depending on strength and time of spark unpredictable
Answer Explanation

MCQs 17: 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 on fuel mixture fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat 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 fuel is injected at atmospheric pres¬sure there are no valves
Answer Explanation

MCQs 18: Which of the following engines can work on very lean mixture__________________?

S.I. engine C.I. engine two stroke engine four stroke engine all of the above
Answer Explanation

MCQs 19: Hot air standard diesel cycle efficiency with increase in value of C„_______________?

increases decreases remains unaffected depends on other factors unpredictable
Answer Explanation

MCQs 20: For low load operation, more suitable (economical) engine is_______________?

S.I. engine C.I. engine both are equally good multicylinder engine two stroke engine
Answer Explanation

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