ic engines objective questions with answers part2

Q1. The specific fuel consumption per BHP hour for diesel engine is approximately
(A) 0.15 kg
(B) 0.2 kg
(C) 0.25 kg
(D) 0.35 kg

Q2. The temperature of interior surface of cylinder wall in normal operation is not allowed to exceed
(A) 80°C
(B) 120°C
(C) 180°C
(D) 240°C

Q3. Crankcase explosion in I.C. engines usually occurs as
(A) first a mild explosion followed by a bi explosion
(B) first a big explosion followed by a mil explosion
(C) both mild and big explosions occur simultaneously
(D) never occurs

Q4. Compression loss in I.C engines occurs due to
(A) leaking piston rings
(B) use of thick head gasket
(C) increase in clearance volume caused by bearing-bushing wear
(D) all of the above

Q5. The specific fuel consumption per BH hour for a petrol engine is approximately
(A) 0.15 kg
(B) 0.2 kg
(C) 0.25 kg
(D) 0.3kg

Q6. The air requirement of a petrol engine during starting compared to theoretical air required for complete combustion is
(A) more
(B) loss
(C) same
(D) may be more or less depending on engine capacity

Q7. The inlet value of a four stroke cycle I.C engine remains open for nearly
(A) 180°
(B) 125°
(C) 235°
(D) 200°

Q8. Which of the following is not an interns combustion engine
(A) 2-stroke petrol engine
(B) 4-stroke petrol engine
(C) diesel engine
(D) steam turbine

Q9. Pick up the false statement
(A) Theoretically correct mixture of air am petrol is approximately 15 : 1
(B) High speed compression engines operate on dual combustion cycle
(C) Diesel engines are compression ignition engines
(D) S.I. engines are quality-governed engines

Q10. If one cylinder of a diesel engine receives more fuel than the others, then for that cylinder the
(A) piston rings would stick into piston grooves
(B) exhaust temperature will be high
(C) engine starts overheating
(D) scavenging occurs

Q11. 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) scavenging
(D) supercharging

Q12. It the temperature of intake air in IC engines is lowered, then its efficiency will
(A) increase
(B) decrease
(C) increase upto certain limit and then decrease
(D) decrease upto certain limit and then in-crease

Q13. In a typical medium speed 4-stroke cycle diesel engine
(A) compression starts at 35° after bottom dead center and ends at top dead center
(B) compression starts at bottom dead center and ends at top dead center
(C) compression starts at 10° before bottom dead center and, ends just before top dead center
(D) may start and end anywhere

Q14. For the same compression ratio
(A) Otto cycle is more efficient than the Diesel
(B) both Otto and Diesel cycles are, equally efficient
(C) compression ratio has nothing to do with efficiency
(D) which is more efficient would depend on engine capacity.

Q15. The process of breaking up or a lipuid into fine droplets by spraying is called
(A) vaporisation
(B) carburetion
(C) injection
(D) atomisation.