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Automobile Engineering MCQs
0

Automobile Engineering Practice Set-1

May 2, 2021

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1. The calorific value of petrol is about

36.5-38.5 MJ/kg

45.5-47 MJ/kg

39.4-42.5 MJ/kg

42.7-43.5 MJ/kg

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

16

12

8

4

3. The negative plates of a lead acid battery has

Lead peroxide (PbO₂)

Spongy lead (Pb)

Lead sulphate (PbSO₄)

Sulphuric acid (H₂SO₄)

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

0.1

1.2

0.4

0.8

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

R

4R²

4R

2R

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

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

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

Increase the speed at which the valves move up and down

Make the crankshaft turn smoothly

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

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

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

None of the above

Absorb the vibrations transferred from the surface of the road

8. The brake warning light warns the driver of

Failure of the primary or secondary circuit of hydraulic system

Air in the hydraulic system

Water in the master cylinder

Power brake failure

9. The vehicle ride will be comfortable if

All of these

Sprang mass is kept minimum

Vehicle mass is kept minimum

Unsprung mass is kept minimum

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

Vapour locking occurs in the brake lines

Brake fades

Brake drags

Antilock braking system malfunctions

Page 2 of 3

11. The painting of automobiles is done to

Prevent rust from growing on the body

Retain the characteristics of steel for long

All of these

Improve its external appearance

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

Tie rod

Pivot

Spline

Sector gear

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

Ampere hours

Weight

Volts

Amperes

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

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

Creates swirl

Maintains a seal and prevents the fuel leakage

Increases the combustion temperature

15. The stroke of an engine is the

Internal diameter of the cylinder

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

Length of the connecting rod

Volume of the cylinder

16. 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

The unsprung mass in lighter

Non vertical external forces are supported by the suspension arms

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

Volatility

Ignition quality

Viscosity

Delay period

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

Air and fuel

Only air

None of these

Only fuel

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

Ignition

Pre-ignition

Rumble

Detonation

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

Society of automotive engineers (SAE)

American petroleum institute (API)

Gross vehicle weight (GVW)

Automatic transmission fluid (ATF)

Page 3 of 3

21. The octane rating of petrol commercially available is

100-110

95-100

85-95

110-125

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

Incomplete combustion

High temperature combustion

High atmospheric temperature combustion

Low temperature combustion

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

Anemometer

Hygrometer

Hydrometer

Multimeter

24. The auto ignition in a spark ignition engine means

Automatic ignition of the charge at the end of compression

Ignition induced by the passage of a spark

Ignition of the charge before the passage of flame front

Ignition induced to supplement the process of normal combustion

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

Lubrication performance

Cooling efficiency

None of these

Resistance to wear

26. The most commonly used power plant in automobiles is

Gas turbine

Battery

I.C. engine

None of these

27. In a square type engine

Diameter and length of piston are same

Geometrical shape is square

Stroke length and cylinder bore are same

Two cylinders are placed horizontal and two vertical

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

I

L

C

H

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

Less than 60 kmph

Less than 40 kmph

More than 60 kmph

Less than 20 kmph

30. The path taken by intake air is

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

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

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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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