Internal Combustion Engines MCQs

Question 1

Volatility of diesel fuel oil is

Accepted Answer

Indicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled off

Answer

Minimum temperature to which oil is heated in order to give off inflammable vapors in sufficient quantity to ignite momentarily when brought in contact with a flame

Answer

Temperature at which it solidifies or congeals

Answer

It catches fire without external aid

Question 2

Which is more viscous lub oil

Accepted Answer

SAE 80

Answer

SEA 30

Answer

SAE 50

Answer

SAE 70

Question 3

In the opposed piston diesel engine, the combustion chamber is located

Accepted Answer

Between the pistons

Answer

Above the piston

Answer

Below the piston

Answer

Anywhere

Question 4

In order to prevent formation of carbon on the injector, the temperature of nozzle tip should be

Accepted Answer

Between 250 - 300°C

Answer

Less than 100°C

Answer

Between 100 - 250°C

Answer

Between 400 - 500°C

Question 5

The thermal efficiency of a petrol engine of two stroke with crank case scavenging as compared to four stroke petrol engine with same comperssion ratio will be

Accepted Answer

Lower

Answer

Higher

Answer

Same

Answer

Depends on size of engine

Question 6

Ignition quality of petrol is expressed by

Accepted Answer

Octane number

Answer

Cetane number

Answer

Calorific value

Answer

Self ignition temperature

Question 7

Petrol is distilled at a temperature in range of

Accepted Answer

65 - 220°C

Answer

30 - 65°C

Answer

220 - 350°C

Answer

350 - 450°C

Question 8

Kerosene is distilled at

Accepted Answer

220 - 350°C

Answer

30 - 65°C

Answer

65 - 220°C

Answer

350 - 450°C

Question 9

Self-ignition temperature of petrol is of the order of

Accepted Answer

More than 500°C

Answer

150°C

Answer

370°C

Answer

450°C