Free Printable IC Engine

1.

In a diesel engine, the duration between the time of injection and ignition, is known as

a)

pre-ignition period

b)

delay period

c)

period of ignition

d)

burning period

2.

The thermal efficiency of diesel engines is about

a)

15%

b)

30%

c)

50%

d)

70%

3.

The pressure inside the cylinder is __________ the atmospheric pressure during the exhaust stroke

a)

equal to

b)

below

c)

above

d)

Zero

4.

The basic requirement of a good combustion chamber is

a)

minimum turbulence

b)

low compression ratio

c)

high thermal efficiency and power output

d)

low volumetric efficiency

5.

The theoretically correct mixture of air and petrol is

a)

10:1

b)

15:1

c)

20:1

d)

25:1

6.

Which of the following does not relate to a compression ignition engine

a)

Fuel pump

b)

Fuel injector

c)

Governor

d)

Carburettor

7.

In compression ignition engines, swirl denotes a

a)

haphazard motion of the gases in the chamber

b)

rotary motion of the gases in the chamber

c)

radial motion of the gases in the chamber

d)

none of the above

8.

Which of the following statement is wrong

a)

In compression ignition engines, detonation occurs near the beginning of combustion

b)

Since the fuel, in compression ignition engines, is injected at the end of compression stroke, therefore, there will be no pre-ignition.

c)

To eliminate knock in compression ignition engines, we want to achieve auto-ignition not early and desire a long delay period.

d)

In compression ignition engines, because of hetrogeneous mixture, the rate of pressure rise is comparatively lower.

9.

A higher compression ratio causes

a)

pre-ignition

b)

increase in detonation

c)

an acceleration in the rate of combustion

d)

any one of these

10.

The knocking tendency in spark ignition engines may be decreased by

a)

controlling the air-fuel mixture

b)

controlling the ignition timing

c)

controlling the exhaust temperature

d)

reducing the compression ratio

11.

If petrol is used in a diesel engine, then

a)

low power will be produced

b)

efficiency will be low

c)

higher knocking will occur

d)

black smoke will be produced

12.

In reciprocating type of internal combustion engine

a)

Linear motion converted into rotary motion

b)

Rotational motion converted into linear motion

c)

Linear motion converted into rotary motion

d)

Rotary motion converted into linear motion

13.

Stoichiometric ratio is

a)

chemically correct air-fuel ratio by weight

b)

chemically correct air-fuel ratio by volume

c)

actual air-fuel ratio for maximum efficiency

d)

none of the above

14.

The ignition of the charge by some hot surface within the engine before the passage of spark is called

a)

pre-ignition

b)

detonation

c)

ignition delay

d)

auto-ignition

15.

The primary component of natural gas is

a)

Methane

b)

Ethane

c)

Pentane

d)

Octane

16.

The condition that results in large quantities of HC emission is

.

a)

high temperature combustion

b)

incomplete combustion

c)

low temperature combustion

d)

high atmospheric temperature combustion

17.

The function of automobile catalytic converter is to control emissions of

a)

carbon dioxide and hydrogen

b)

carbon monoxide and hydrogen

c)

carbon monoxide and carbon dioxide

d)

carbon monoxide and nitrogen dioxide

18.

Dark, black smoke from diesel engines usually results when the engine is

a)

Running at slow speeds

b)

Running at light loads

c)

Running at full load and full speed

d)

Running at full speed but under no load conditions

19.

The discharge of hydrocarbons from an automobile exhaust is minimum when the vehicle is

a)

Idling

b)

Cruising at low speeds

c)

Cruising at high speeds

d)

Accelerating

20.

The injection pressure in a diesel engine is about

a)

10 bar

b)

100 bar

c)

150 bar

d)

.500 bar

21.

The camshaft of an eight-cylinder, four-cycle engine has

a)

4 cams

b)

8 cams

c)

16 cams

d)

2 cams

22.

Engine pistons ‘are usually made of aluminium alloy because it is

a)

is lighter

b)

wears less

c)

absorbs shocks

d)

stronger

23.

For the same power developed in I.C. engines, the cheaper system is

a)

naturally aspirated

b)

supercharged

c)

centrifugal pump

d)

turbo charger

24.

Following is the correct order in which fuel is injected

a)

Fuel tank – Fuel filter – Fuel feed pump – Fuel injection pump – injector

b)

Fuel tank – Fuel feed pump – Fuel filter – Fuel injection pump – injector

c)

Fuel tank – Fuel filter – Fuel injection pump – Fuel feed pump – injector

d)

Fuel tank – Fuel injection pump – Fuel filter – Fuel feed pump – injector

25.

Which is more viscous lub oil

a)

SEA 30

b)

SAE 40

c)

SAE 50

d)

SAE 80

26.

Name a gas which enters a catalytic converter.

a)

Methane

b)

Hexane

c)

Nitrogen Monoxide

d)

Carbon Monoxide

27.

Name a gas which exits a catalytic converter.

a)

Hexane

b)

Octane

c)

Helium

d)

Oxygen

28.

A catalytic converter in a car uses 2 types of catalysts: a reduction catalyst, and an oxidization catalyst.

a)

True

b)

False

29.

The lubricants commonly used in the automobiles are

a)

animal oils

b)

vegetable oils

c)

synthetic oils

d)

cooking oils

30.

Most commonly used lubrication system in automobiles is the

a)

splash system

b)

pressure system

c)

petrol system

d)

gravity system

IC Engine - Revision 3

Total questions: 30

Worksheet time: 15mins

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