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Automobile Engineering MCQs
0

Automobile Engineering Practice Set-1

May 2, 2021

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1. The auto ignition in a spark ignition engine means

Automatic ignition of the charge at the end of compression

Ignition of the charge before the passage of flame front

Ignition induced by the passage of a spark

Ignition induced to supplement the process of normal combustion

2. In a square type engine

Stroke length and cylinder bore are same

Geometrical shape is square

Two cylinders are placed horizontal and two vertical

Diameter and length of piston are same

3. The coefficient of friction for the clutch facing is approximately

1.2

0.4

0.8

0.1

4. The stroke of an engine is the

Length of the connecting rod

Volume of the cylinder

Internal diameter of the cylinder

Distance between T.D.C. and B.D.C.

5. The condition that results in large quantities of HC emission is

High temperature combustion

Low temperature combustion

Incomplete combustion

High atmospheric temperature combustion

6. If the air-fuel mixture ignites before the spark takes place at spark plug, the condition is called

Ignition

Detonation

Pre-ignition

Rumble

7. The instrument used to check specific gravity of acid in a battery is

Hygrometer

Hydrometer

Multimeter

Anemometer

8. The engine oil viscosity is defined by ___________ ratings.

Automatic transmission fluid (ATF)

Gross vehicle weight (GVW)

American petroleum institute (API)

Society of automotive engineers (SAE)

9. The calorific value of petrol is about

45.5-47 MJ/kg

39.4-42.5 MJ/kg

42.7-43.5 MJ/kg

36.5-38.5 MJ/kg

10. The function of a first compression ring (top ring) is that it

Creates swirl

Maintains a seal and prevents the fuel leakage

Maintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber

Increases the combustion temperature

Page 2 of 3

11. The vehicle ride will be comfortable if

Sprang mass is kept minimum

All of these

Vehicle mass is kept minimum

Unsprung mass is kept minimum

12. The drive-shafts are connected to the differential and wheel hubs through universal joints because the universal joints

Compensate for variations in the relative positions of the differential and the wheels which result from bumpy road surfaces or other similar driving conditions.

Absorb any difference in speed between the left and right wheels when the vehicle is turning

Absorb the vibrations transferred from the surface of the road

None of the above

13. The capacity of a battery is usually expressed in terms of

Amperes

Ampere hours

Volts

Weight

14. The path taken by intake air is

Air cleaner carburettor (or throttle body) intake manifold intake ports cylinders

Air cleaner carburettor (or throttle body) intake ports intake manifold cylinders

Carburettor (or throttle body) air cleaner intake manifold intake ports cylinders

Air cleaner intake manifold carburettor (or throttle body) intake ports cylinders

15. The crankshaft of a typical inline four cylinder engine has ________ balance weights.

8

16

12

4

16. The cetane number of a Diesel fuel is a measure of

Volatility

Ignition quality

Delay period

Viscosity

17. The brake warning light warns the driver of

Air in the hydraulic system

Water in the master cylinder

Power brake failure

Failure of the primary or secondary circuit of hydraulic system

18. When the brake pedal free play is less than the specified value, then the

Brake drags

Brake fades

Antilock braking system malfunctions

Vapour locking occurs in the brake lines

19. The air resistance to a car at 20 kmph is R. The air resistance at 40 kmph will be

4R²

4R

2R

R

20. The octane rating of petrol commercially available is

95-100

100-110

110-125

85-95

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21. The connecting rods are generally made of __________ shaped cross-section.

L

H

C

I

22. The component that connects the steering rack to the knuckles is

Tie rod

Pivot

Spline

Sector gear

23. The braking control type traction control system (TCS) generally operates in the speed range of

More than 60 kmph

Less than 40 kmph

Less than 60 kmph

Less than 20 kmph

24. It is necessary to maintain the valve clearances as they

Increase the speed at which the valves move up and down

Reduce the resistance to sliding that occurs between the cam and the tappet

Make the crankshaft turn smoothly

Allow for lengthening of the valves owing to the heat of combustion

25. The negative plates of a lead acid battery has

Spongy lead (Pb)

Sulphuric acid (H₂SO₄)

Lead sulphate (PbSO₄)

Lead peroxide (PbO₂)

26. The main feature of Macpherson strut suspension is that

The vertical size of the suspension can be made more compact

The assembly is slightly more complicated in design

Non vertical external forces are supported by the suspension arms

The unsprung mass in lighter

27. The painting of automobiles is done to

All of these

Prevent rust from growing on the body

Improve its external appearance

Retain the characteristics of steel for long

28. The most commonly used power plant in automobiles is

Battery

None of these

Gas turbine

I.C. engine

29. The characteristic that is enhanced by the honing of cylinder sleeves inner surface is

Lubrication performance

None of these

Resistance to wear

Cooling efficiency

30. In petrol engines, during suction stroke, _________ is drawn in the cylinder

Air and fuel

Only air

None of these

Only fuel

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A Demrot is the founder of VideRime Online Learning, a leading engineering website. He did his BE Civil and M.Tech Structure from RGPV University, Bhopal and has been working as an Assistant Professor in a reputed college.

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