267. Four-wheel drive implies
A.Vehicle has 4 wheels
B.All the four wheels can't be steered
C.All the four wheels can be steered
D.Rear of vehicle has four wheels which . are powered
268. Automobile engines are usually designed as multi-cylinder engines because of
A.Economy reasons
B.Higher efficiency
C.Better balance, uniform torque output
D.Lower fuel consumption
269. The commonly used ignition accelerators are
A.Acetone peroxide
B.Ethyl nitrate
C.Isoamyl nitrate
D.Any one of the above
270. Ignition accelerators in a compression ignition engine reduce or eliminate
A.Combustion knock
B.Preignition
C.Detonation
D.Spontaneous combustion
271. Ignition accelerators are substances which
A.Increase the rate of pre-flame reaction and reduce the ignition lag
B.Increase knock
C.Reduce detonation
D.Increase thermal efficiency
272. Pick up the correct statement
A.Both iso-octane and normal-heptane help in prolonging the reaction time for auto-ignition at a particular pressure and temperature
B.Both iso-octane and normal heptane help to resist auto-ignition
C.Normal-heptane accelerates auto-ignition and iso-octane helps to resist auto-igntion
D.Iso-octane accelerates auto ignition and normal-heptane helps to resist auto-ignition
273. Petrol engines are not suitable for part load operation, because
A.Mechanical efficiency is poor due to increasing internal losses at increased throttling
B.Of fear of pre-ignition
C.Of huge knocking
D.Of increased detonation tendency
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