IE Engines Mechanical Online Quiz Questions Test4

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1. Compression loss in I.C engines occurs duto ____.
leaking piston rings	use of thick head gasket
clogged air-inlet slots	all of the above

2. The specific fuel consumption per BH hour for a petrol engine is approximately ______.
0.15 kg	0.2 kg
0.25 kg	0.3kg

3. The air requirement of a petrol engin during starting compared to theoretical airequired for complete combustion is _____.
more	loss
same	may be more or less depending on engine capacity

4. The inlet value of a four stroke cycle I.C engine remains open for nearly
180°	125°
235°	200°

5. Which of the following is not an interna combustion engine
2-stroke petrol engine	4-stroke petrol engine
diesel engine	steam turbine

6. 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	S.I. engines are quality-governed engines

7. If one cylinder of a diesel engine receives more fuel than the others, then for that cylinder the
exhaust will be smoky	piston rings would stick into piston grooves
exhaust temperature will be high	engine starts overheating

8. The output of a diesel engine can be increased without increasing the engine revolution or size in following way
feeding more fuel	increasing flywheel size
heating incoming air	supercharging

9. It the temperature of intake air in IC engines is lowered, then its efficiency will
increase	decrease
remain same	increase upto certain limit and then decrease

10. In a typical medium speed 4-stroke cycle diesel engine
compression starts at 35° after bottom dead centre and ends at top dead centre	compression starts at bottom dead centre and ends at top dead centre
compression starts at 10° before bottom dead centre and, ends just before top dead centre	may start and end anywhere

11. For the same compression ratio
Otto cycle is more efficient than the Diesel	Diesel cycle is more efficient'than Otto
both Otto and Diesel cycles are, equally efficient	compression ratio has nothing to do with efficiency

12. The precess of breaking up or a lipuid into fine droplets by spraying is called
vaporisation	carburetion
ionisation	atomisation

13. As a result of detonation in an I.C. engine, following parameter attains very high value
peak pressure	rate of rise of pressure
rate of rise of temperature	peak temperature

14. Which of the following statements is correct?
All the irreversible engines have same efficiency	All the reversible engines have same efficiency
Both Rankine and Caront cycles have same efficiency between same temperature limits	All reversible engines working between same temperature limits have same efficiency

15. Most high speed compression engines operate on
Diesel cycle	Otto cycle
Dual combustion cycle	Special type of air cycle

16. The accunmulation of carbon in a cylinder results in increase of
clearance volume	volumetric efficiency
ignition time	effective compression ratio

17. Which of the following medium is compressed in a Diesel engine cylinder
air aione	air and fuel
air and lub oil	fuel alone

18. The air-fuel ratio of the petrol engine is controlled by
fuel pump	governor
injector	carburettor

19. In a typical medium speed, 4-stroke cycle diesel engine
fuelinjection starts at 10° before toj dead centre and ends at 20° after tor dead centre	fuel injection starts at top dead centre and ends at 20° after top dead centre
fuel injection starts at just before top dead centre and ends just after top deac centre	may start and end anywhere

20. Diesel fuel, compared to petrol is ______.
less difficult to ignite	just about the same difficult to ignite
more difficult to ignite	highly ignitable