IE Engines Engineering Online Quiz Questions Test3

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1. A heat engine utilises the ______.
calorific value of oil	low heat value oil
high heat value of oil	mean heat value of oil

2. Gaseous-fuel guarantees are based on _____.
calorific value of oil	low heat value of oil
high heat value of oil	mean heat value of oil

3. Fuel consumption of diesef engines is not guaranteed at one quarter load because at such low loads
the friction is high	the friction is unpredictable
the small difference in cooling water temperature or in internal friction has a disproportionate effect	the engine is rarely operated

4. Polymerisation is a chemical process in which molecules of a compound become
larger	slowed down
smaller	liquid

5. The term scavenging is generally associated with
2-stroke cycle engines	4-stroke cycle engines
aeroplane engines	high efficiency engines

6. In diesel engine, the compression ratio in comparison to expansion ratio is _____.
same	less
more	variable

7. The cam shaft of a four stroke I.C. engine running at 1500 rmp will run at ______.
1500 rpm	750 rpm
3000 rpm	any value independent of engine speed

8. Engine pistons 'are usually made of aluminium alloy because it
is lighter	wears less
absorbs shocks	is stronger

9. Most high speed compression engines operate on
Otto cycle	Diesel cycle
Dual cycle	Carnot cycle

10. The specific fuel consumption of a petrol engine compared to diesel engine of same H.P. is _____.
same	more
less	less or more depending on operating conditions

11. A diesel engine as compared to petrol engine (both running ar rated load) is _____.
more efficient	less efficient
equally efficient	unperdictable

12. The size of inlet valve of.an engine in comparison to exhaust valve is _____.
more	less
same	more/less depending on capacity of engine

13. In a cycle, the spark lasts roughly for
1 sec	0.1 sec
0.01 sec	0.001 sec

14. Which of the following is false statement : Excess quantities of sulphur in diesel fuel are Objectionable because it may cause the following
piston ring and cylinder wear	formation of hard coating on piston skirts
oil sludge in the engine crank case	detonation

15. Which of the following is false statement. Some of the methods used to reduce diesel smoke are as follows
using additives in the fuel	engine derating i.e. reducing the maximum flow of fuel
increasing the compression ratio	adherence to proper fuel specification

16. The fuel air ratio in a petrol engine fitted with suction carburettor, operating with dirty air filter as compared to clean filter will be ______.
higher	lower
remain unaffected	unpredictable

17. Pick up the wrong statement about supercharging
supercharging reduces knocking in diesel engines	there can be limited supercharging in petrol engines because of detonation
supercharging at high altitudes is essential	supercharging results in fuel economy

18. The actual volume of fresh charge admitted in 4-stroke petrol engine is _____.
equal to stroke volume	equal to stroke volume and clearance volume
less than stroke volume	more than stroke volume

19. The magneto in an automobile is basically
transformer	d.c. generator
capacitor	magnetic circuit

20. The reason for supercharging in any engine is to _____.
increase efficiency	increase power
reduce weight and bulk for a given output	effect fuel economy