Engineering :: Heat Engines

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141.

Out of the following diesel engine the minimum air consumption per B.H.P. will be in

A.	4 stroke, mech, injection	B.	4 stroke, air injection
C.	2 stroke, mech, injection, pump, scavenging	D.	2 stroke, air injection

142.

For spark ignition engines fuel in order of decreasing knock tendency are

A.	Paraffins, aromatics, naphthenes	B.	Paraffins, naphthenes, armatics
C.	Naphthenes, paraffins	D.	Naphthenes, aromatics, paraffins
E.	Aromatics, paraffins, naphthenes

143.

For combustion of one kg of carbon the quantity of oxygen required (air contains 23% by wight of oxygen) is

A.	2.62 kg	B.	3.67 kg
C.	8 kg	D.	11.6 kg
E.	12 kg

144.

Air required for complete combustion of 1 kg of carbon is 11.6 kg. If a fuel contains 88.6% Carbon and 11.4% Hydrogen, the air requirement will

A.	Remain unaltered	B.	Will decrease
C.	Will increase

145.

Air consumption of a four-stroke diesel engine per rated BHP/hr will be

A.	1 kg	B.	5 - 7 kg
C.	10 - 14 kg	D.	15 kg
E.	20 kg

146.

In spark ignition engines, the knocking tendency is reduced by

A.	Reduction of compression ratio	B.	Advancing ignition timing
C.	Increasing exhaust temperature	D.	Adding dope like tetra ethy lead to the fuel
E.	All of the above

147.

Which spark plug will have lower heat rating

A.	W 95 T1	B.	W 145 T1
C.	W 225 T1	D.	W 300 T1
E.	W 350 T1

148.

If after some use the lower part, electrodes and beathing space of a spark plug are found coated by deposits of soot and carbon, the conclusion will be

A.	Spark plug is of proper heat rating	B.	Composition of mixture in the engine is correct
C.	Spark plug is of too high heat rating	D.	Spark advance is incorrect
E.	Spark plug is short circuited

149.

Crankcase explosion occurs in

A.	Four stroke Cl engines	B.	Two stroke Cl engines
C.	Four stroke SI engines	D.	Two stroke SI engines
E.	Gas engines

150.

Crankcase dilution is

A.	Dilution of fuel in crank case	B.	Dilution of lubricating oil in crankcase
C.	Dilution of mixture while passing through crankcase in two stroke engines	D.	Addition of water in crankcase
E.	None of the above