Internal Combustion Engines MCQs

Question 1

Four-wheel drive implies

Accepted Answer

All the four wheels can't be steered

Answer

Vehicle has 4 wheels

Answer

All the four wheels can be steered

Answer

Rear of vehicle has four wheels which . are powered

Question 2

Automobile engines are usually designed as multi-cylinder engines because of

Accepted Answer

Better balance, uniform torque output

Answer

Economy reasons

Answer

Higher efficiency

Answer

Lower fuel consumption

Question 3

The commonly used ignition accelerators are

Accepted Answer

Any one of the above

Answer

Acetone peroxide

Answer

Ethyl nitrate

Answer

Isoamyl nitrate

Question 4

Ignition accelerators in a compression ignition engine reduce or eliminate

Accepted Answer

Combustion knock

Answer

Preignition

Answer

Detonation

Answer

Spontaneous combustion

Question 5

Ignition accelerators are substances which

Accepted Answer

Increase the rate of pre-flame reaction and reduce the ignition lag

Answer

Increase knock

Answer

Reduce detonation

Answer

Increase thermal efficiency

Question 6

Pick up the correct statement

Accepted Answer

Normal-heptane accelerates auto-ignition and iso-octane helps to resist auto-igntion

Answer

Both iso-octane and normal-heptane help in prolonging the reaction time for auto-ignition at a particular pressure and temperature

Answer

Both iso-octane and normal heptane help to resist auto-ignition

Answer

Iso-octane accelerates auto ignition and normal-heptane helps to resist auto-ignition

Question 7

Petrol engines are not suitable for part load operation, because

Accepted Answer

Mechanical efficiency is poor due to increasing internal losses at increased throttling

Answer

Of fear of pre-ignition

Answer

Of huge knocking

Answer

Of increased detonation tendency

Question 8

The power to weight ratio of diesel engine compared to petrol engine is

Accepted Answer

Low

Answer

High

Answer

Same

Answer

High in some cases and low in other cases

Question 9

Flash point for diesel fuel oil should be

Accepted Answer

Minimum 49°C

Answer

Maximum 49°C

Answer

Minimum 99°C

Answer

Maximum 99°C