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MCQs 1: Piston rings are plated with chromium,cadmium or phosphate in order to__________________?

reduce cost improve surface finish prevent clogging reduce wear and eliminate scuffing improve heat transfer
Answer Explanation

MCQs 2: To reduce the possibility of knock in the C.I. engines, the first elements of fuel and air should have_______________?

high temperature high density short delay reactive mixture all of the above
Answer Explanation

MCQs 3: In order to prevent knock in the S.I. engines, the charge away from the spark plug should have___________________?

low temperature low density long ignition delay rich mixture all of the above
Answer Explanation

MCQs 4: Diesel engines have low specific fuel consumption compared to petrol engine. This statement is____________________?

not true true at full load true at part load true at both part and full load there could not be any such criterion
Answer Explanation

MCQs 5: Carbon residue in diesel oil should not be more than___________________?

1% 0.5% 0.1% 0.01% 0.001%
Answer Explanation

MCQs 6: Injection lag is_________________?

the time taken by fuel after injection (before top dead center) to reach upto auto-ignition temperature time before actual fuel injection and the pump pluger starts to pump fuel time corresponding to actual injection and top dead center time corresponding to actual ignition and top dead center none of the above
Answer Explanation

MCQs 7: The knocking in diesel engines for given fuel, will be__________________?

enhanced by increasing compression ratio enhanced by decreasing compression ratio unaflected by compression ratio first enhanced by increasig compression ratio upto a limit beyond which it will be suppressed dependent on other factors
Answer Explanation

MCQs 8: According to Recardo’s theory, detonation occurs due to______________________?

instantaneous auto-ignition of last part of charge to be burnt improper mixing of air and fuel improper combustion self ignition temperature has nothing to do with detonation none of the above
Answer Explanation

MCQs 9: The ignition of charge by some hot surface in the engine cylinder before operation of spark plug is known as________________?

auto ignition preignition retarded ignition accelerated ignition detonation
Answer Explanation

MCQs 10: Ignition quality of diesel-fuel oil is expressed by an index called__________________?

octane number cetane number calorific value carbon content ignition temperature
Answer Explanation

MCQs 11: The compression ratio of motor cars is___________________?

5 7 10 13 16
Answer Explanation

MCQs 12: Freezing temperature of petrol is usually__________________?

0°C – 10°C 10°C less than – 30°C less than – 273°C
Answer Explanation

MCQs 13: The most popular firing order in case of four cylinder in-line I.C. engine is__________________?

1-2-3-4 1-3-2-4 1-4-2-3 1-2-4-3 1-3-4-
Answer Explanation

MCQs 14: The specific gravity of diesel oil Is_________________?

1 0.7 0.85 0.5 1.25
Answer Explanation

MCQs 15: Detonation can be controlled by_____________________?

varying compression ratio using lian mixture retarding the spark timing reducing the r.p.m. increasing inlet pressure
Answer Explanation

MCQs 16: The m.e.p. of a diesel cycle having fixed compression ratio with increase in cut-off will_________________?

increase decreae be unaffected depend on other factors unpredictable
Answer Explanation

MCQs 17: The firing order in a six stroke I.C. engine is_________________?

1-3-6-5-2-4 1-4-2-5-6-3 1-6-2-5-4-3 1-5-2-6-3-4 1-5-3-4-2-6
Answer Explanation

MCQs 18: The efficiency of I.C. engines normally is of the order of_________________?

15-20% 20-25% 25-30% 30-35% 35-50%
Answer Explanation

MCQs 19: Sulphur content in diesel oil should not be more than_________________?

10% 5% 1% 0.1% 0.01%
Answer Explanation

MCQs 20: Pick up the false statement ?

Thermal efficiency of diesel engine i about 34% Theoretically correct mixture of air am petrol is approximately 15 : 1 High speed compression engines operate on dual combustion cycle Diesel engines are compression ignition engines S.I. engines are quality-governed engines
Answer Explanation

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