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41.

The octane rating of petrol commercially available is usually

A.	85 - 90	B.	90 - 100
C.	100 - 105	D.	110 - 125
E.	125 - 140

42.

Theoretically air required for the combustion of one kg of fuel is

A.	10 kg	B.	14.5 kg
C.	16.7 kg	D.	17.4 kg
E.	18.9 kg

43.

The heating value of petrol is

A.	7650 kcal/kg	B.	8000-8500 kcal/kg
C.	10,000-10400 kcal/kg	D.	12750-13850 kcal/kg
E.	15000-16000 kcal/kg

44.

The heating value of diesel is approximately

A.	6500 kcal/kg	B.	7500 kcal/kg
C.	8500 kcal/kg	D.	10,000 kcal/kg
E.	125000 kcal/kg

45.

The freezing temperature of ordinary petrol is

A.	10?C	B.	0?C
C.	? 5?C to ? 10?C	D.	? 30?C to ? 50?C
E.	? 100?C to ? 117?C

46.

The boiling point of Diesel fuel may be expected to be in the range

A.	70?C to 100?C	B.	100?C to 112?C
C.	125?C to 135?C	D.	150?C to 200?C
E.	220?C to 375?C

47.

Cetane number of Diesel oil normally available in market is in the range.

A.	45 -- 50	B.	60 -- 65
C.	75 -- 80	D.	90 -- 100
E.	90 -- 105

48.

Air supply in case of Diesel engines is usually

A.	10 percent deficient	B.	Stoichometric
C.	5 to 10 percent surplus	D.	15 to 20 percent surplus
E.	About 40 percent surplus

49.

In a four stroke S.I engine the exhaust valve usually opens

A.	At BDC	B.	At TDC
C.	35? to 60? after BDC	D.	35? to 60? before BDC
E.	10? to 20? before TDC

50.

In a S.I. engine the intake valve closes

A.	At BDC	B.	At TdDC
C.	35? to 80? after BDC	D.	25? to 80? before BDC
E.	10? to 20? before

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