Internal Combustion Engines MCQs

Question 1

Which of the following engines can work on very lean mixture

Accepted Answer

C.I. engine

Answer

S.I. engine

Answer

Two stroke engine

Answer

Four stroke engine

Question 2

Hot air standard diesel cycle efficiency with increase in value of C

Accepted Answer

Decreases

Answer

Increases

Answer

Remains unaffected

Answer

Depends on other factors

Question 3

In turbulence chamber in diesel engine

Accepted Answer

Fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat

Answer

The shape and layout of the piston crown, the inlet port, and the valve produce the turbulent effect of fuel mixture

Answer

Only a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency mixes thoroughly into main cylinder charge

Answer

There are no valves

Question 4

For low load operation, more suitable (economical) engine is

Accepted Answer

C.I. engine

Answer

S.I. engine

Answer

Both are equally good

Answer

Multi-cylinder engine

Question 5

A two stroke crank compressed engine has following ports in the cylinder

Accepted Answer

Suction port, exhaust port and transfer Port

Answer

Suction port and exhaust port

Answer

Suction port and transfer port

Answer

Transfer port and exhaust port

Question 6

For the same size and weight, a two stroke engine as compared to four stroke engine will generate power

Accepted Answer

About 1.7 times

Answer

About twice

Answer

About 0.5 times

Answer

Nearly equal

Question 7

A two stroke engine is usually identified by

Accepted Answer

Absence of valves

Answer

Size of flywheel

Answer

Weight of engine

Answer

Type of lubrication system

Question 8

If diesel is fed by mistake in the oil tank of a petrol engine, then engine will

Accepted Answer

Not run

Answer

Give lot of smoke

Answer

Detonate

Answer

Knock

Question 9

The thermal efficiency of a semi-diesel cycle having fixed compression ratio and fixed quantity of heat, with increase in pressure ratio will

Accepted Answer

Increase

Answer

Decrease

Answer

Remain unaffected

Answer

Increase/decrease depending upon engine capacity