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Automobile Engineering MCQs
0

Automobile Engineering Practice Set-1

May 2, 2021

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

0.8

0.4

1.2

0.1

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

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

Increase the speed at which the valves move up and down

Make the crankshaft turn smoothly

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

3. 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

4. The path taken by intake air is

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

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

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

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

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

2R

4R

R

4R²

6. The brake warning light warns the driver of

Power brake failure

Failure of the primary or secondary circuit of hydraulic system

Water in the master cylinder

Air in the hydraulic system

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

Absorb the vibrations transferred from the surface of the road

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

None of the above

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

8. The calorific value of petrol is about

36.5-38.5 MJ/kg

42.7-43.5 MJ/kg

45.5-47 MJ/kg

39.4-42.5 MJ/kg

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

8

16

4

12

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

Ignition

Rumble

Pre-ignition

Detonation

Page 2 of 3

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

Maintains a seal and prevents the fuel leakage

Creates swirl

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

Increases the combustion temperature

12. The painting of automobiles is done to

All of these

Prevent rust from growing on the body

Retain the characteristics of steel for long

Improve its external appearance

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

Volatility

Delay period

Viscosity

Ignition quality

14. The auto ignition in a spark ignition engine means

Ignition induced to supplement the process of normal combustion

Ignition of the charge before the passage of flame front

Automatic ignition of the charge at the end of compression

Ignition induced by the passage of a spark

15. The stroke of an engine is the

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

Volume of the cylinder

Length of the connecting rod

Internal diameter of the cylinder

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

Incomplete combustion

Low temperature combustion

High atmospheric temperature combustion

High temperature combustion

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

Sector gear

Pivot

Spline

Tie rod

18. The vehicle ride will be comfortable if

Sprang mass is kept minimum

Vehicle mass is kept minimum

All of these

Unsprung mass is kept minimum

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

Amperes

Volts

Weight

Ampere hours

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

Less than 20 kmph

More than 60 kmph

Less than 40 kmph

Less than 60 kmph

Page 3 of 3

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

H

L

C

I

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

Multimeter

Hygrometer

Hydrometer

Anemometer

23. 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

24. The negative plates of a lead acid battery has

Lead peroxide (PbO₂)

Spongy lead (Pb)

Lead sulphate (PbSO₄)

Sulphuric acid (H₂SO₄)

25. The octane rating of petrol commercially available is

85-95

110-125

100-110

95-100

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

None of these

Lubrication performance

Cooling efficiency

Resistance to wear

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

Automatic transmission fluid (ATF)

Society of automotive engineers (SAE)

Gross vehicle weight (GVW)

American petroleum institute (API)

28. The most commonly used power plant in automobiles is

None of these

I.C. engine

Gas turbine

Battery

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

Only air

None of these

Air and fuel

Only fuel

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

Vapour locking occurs in the brake lines

Brake drags

Brake fades

Antilock braking system malfunctions

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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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