Free Printable Advanced 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 thermal efficiency of diesel engines on weak mixtures is

a)

unaffected

b)

lower

c)

higher

d)

dependent on other factor

6.

The theoretically correct mixture of air and petrol is

a)

10:1

b)

15:1

c)

20:1

d)

25:1

7.

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

a)

Fuel pump

b)

Fuel injector

c)

Governor

d)

Carburettor

8.

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

9.

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.

10.

The ratio of the brake power to the indicated power is called

a)

mechanical efficiency

b)

overall efficiency

c)

indicated thermal efficiency

d)

volumetric efficiency

11.

The inlet valve of a four stroke cycle internal combustion engine remains open for

a)

130°

b)

180°

c)

230°

d)

270°

12.

The correct mixture strength (by weight) for petrol is about

a)

14.6:1

b)

18.5:1

c)

20.4:1

d)

22.6:1

13.

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

14.

The combustion in compression ignition engines is

a)

homogeneous

b)

hetrogeneous

c)

both (a) and (b)

d)

none of these

15.

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

16.

The operation of forcing additional air under pressure into the engine cylinder is known as

a)

supercharging

b)

carburetion

c)

turbulence

d)

delay period

17.

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

18.

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

19.

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

20.

The fuels in order of decreasing knock tendency for spark ignition engines are

a)

Paraffin, aromatic, napthene

b)

Paraffin, napthene, aromatic.

c)

Napthene, aromatics, paraffin

d)

Napthene, paraffin, aromatic.

21.

The loud pulsating noise heard within the cylinder of an internal combustion engine is known as

a)

Detonation

b)

Turbulence

c)

Pre-ignition

d)

Supercharging

22.

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

23.

The loud pulsating noise heard within the cylinder of an internal combustion engine is known as

a)

detonation

b)

turbulence

c)

pre-ignition

d)

supercharging

24.

The primary component of natural gas is

a)

Methane

b)

Ethane

c)

Pentane

d)

Octane

25.

Which biofuel has the highest motor octane number

a)

Unleaded Gasoline

b)

Methanol

c)

Ethanol

d)

Butanol

26.

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

27.

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

28.

A mixture of theoretical air and fuel for complete combustion of fuel is called

a)

Rich mixture

b)

Lean mixture

c)

Air-fuel mixture

d)

Stoichiometric mixture

29.

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

30.

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

31.

Combustion in compression ignition engines is.

a)

homogeneous

b)

heterogeneous

c)

laminar

d)

turbulent

32.

Polymerization is a chemical process in which molecules of a compound become

a)

larger

b)

slowed down

c)

smaller

d)

liquid

33.

The injection pressure in a diesel engine is about

a)

10 bar

b)

100 bar

c)

150 bar

d)

.500 bar

34.

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

a)

4 cams

b)

8 cams

c)

16 cams

d)

2 cams

35.

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

36.

n 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

37.

The mean effective pressure obtained from engine indicator indicates the

a)

Maximum pressure developed

b)

Minimum pressure

c)

Instantaneous pressure at any instant

d)

Average pressure

38.

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

a)

is lighter

b)

wears less

c)

absorbs shocks

d)

stronger

39.

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

a)

naturally aspirated

b)

supercharged

c)

centrifugal pump

d)

turbo charger

40.

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

41.

The following is the chemical formula for petrol

a)

C7H16

b)

C8H18

c)

C9H20

d)

C10H22

42.

In two stroke engine there is one power stroke in _____ of crankshaft rotation.

a)

90°

b)

180°

c)

270°

d)

360°

43.

Which is more viscous lub oil

a)

SEA 30

b)

SAE 40

c)

SAE 50

d)

SAE 80

44.

Horsepower is a measure of

a)

The amount of work done

b)

The rate of doing work

c)

The speed of shaft rotation

d)

The amount of heat generated.

45.

The thermal efficiency of a standard Otto cycle for a compression ratio of 5.5 will be

a)

25%

b)

50%

c)

75%

d)

100%

46.

Polymerisation is a chemical process in which molecules of a compound become

a)

larger

b)

slowed down

c)

smaller

d)

liquid

47.

As a result of detonation in an I.C. engine, following parameter attains very high value

a)

peak pressure

b)

rate of rise of pressure

c)

rate of rise of temperature

d)

peak temperature

48.

As a result of detonation in an I.C. engine, following parameter attains very high value

A.

B.

C.

D.

a)

peak pressure

b)

rate of rise of pressure

c)

rate of rise of temperature

d)

peak temperature

49.

Mixture strength is defined as the ratio of

a)

Stoichiometric Air-fuel ratio / Actual Air-fuel ratio

b)

Stoichiometric Air-fuel ratio / Theoretical Air-fuel ratio

c)

Actual Air-fuel ratio / Stoichiometric Air-fuel ratio

d)

Theoretical Air-fuel ratio / Stoichiometric Air-fuel ratio

50.

The actual volume of fresh charge admitted in 4-stroke petrol engine is

.

a)

equal to stroke volume

b)

equal to stroke volume and clearance volume

c)

less than stroke volume

d)

more than stroke volume

Advanced IC Engine

Total questions: 50

Worksheet time: 47mins

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