Mechanical Engineering Objective Questions { Internal Combustion Engines }

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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

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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

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269. The commonly used ignition accelerators are

A. Acetone peroxide

B. Ethyl nitrate

C. Isoamyl nitrate

D. Any one of the above

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270. Ignition accelerators in a compression ignition engine reduce or eliminate

A. Combustion knock

D. Spontaneous combustion

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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

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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

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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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