Automobile Engineering Practice Set-8

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1. The main cause for the change in engine oil viscosity is

Humidity

Temperature

Contamination

Vibration

2. The rating of C.I. engine fuel (Diesel) is given by

Performance number

Cetane number

None of these

Octane number

3. Valve overlap is the number of degrees of camshaft rotation during which

(d) None of these

(a) Both valves are closed

(c) Both 'A' and 'B'

(b) Both valves are open

4. A maintenance free battery

Has lead-antimony plate grid

Does not contain acid

Does not contain water

Has lead-calcium plate grid

5. The condition that causes vapour locking in a brake system is

An excessively high engine speed on a downhill road

Keeping the vehicle without use for an extended period

Overcooling of the brakes during high speed driving

Overheating of the fluid due to frequent brake application

6. The sequence order of events in a four stroke engine is

Suction exhaust power compression

Suction power compression exhaust

Suction compression power exhaust

Exhaust compression power suction

7. The oil pump is driven by the

Alternator shaft

Camshaft

Crankshaft via drive belt

Crankshaft directly

8. The component that is responsible for converting the rotation of the steering wheel into lateral motion is the

Steering gearbox

Steering wheel

Tie rod

Steering shaft

9. Which of the following is not a part of the chassis?

Seats

Wheels

Steering system

Front axle

10. Which one of the following statements correctly describes the construction of a planetary gear type differential?

Each planetary pinion gear meshes with both the central gear and the internal gear.

The internal gear is fixed to the planetary gear.

The six planetary pinions rotate in constant mesh with the internal gears.

One drive shaft is splined to the central gear and the other to the planetary gear.

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11. In a four cylinder inline engine, the number of firing strokes in one revolution of the crank is

4

1

3

2

12. The condition that results in large quantities of CO emission is

High temperature combustion

Insufficient air during combustion

Insufficient fuel during combustion

Low temperature combustion

13. The operation of removing trapped air from the hydraulic braking system is known as

Tapping

Trapping

Cleaning

Bleeding

14. The function of anti-lock brake system (ABS) is that is

Prevents nose dives during braking and thereby postpones locking of the wheels

Minimizes the brake fade

Maintains directional control during braking by preventing the wheels from locking

Reduces the stopping distance

15. In an engine, the temperature of the piston will be more at the

Crown of the piston

Piston walls

Piston rings

Skirt of the piston

16. The coefficient of rolling resistance for a truck weighing 63,500 N is 0.018. The rolling resistance to the truck is

11.43 N

1.143 N

114.3 N

1143 N

17. In a four wheel drive (4WD), the numbers of gear boxes are

1

3

4

2

18. What type of bearing is used for main bearings and connecting rod bearings?

Ball bearings

Taper roller bearing

Plain bearings

Needle roller bearing

19. In a Diesel engine, the fuel is ignited by

The heat of compression

An electric spark

None of these

The hot exhaust

20. The engine oil is stored in _________ when the engine is not running.

Separate oil tank

Oil pan

Cylinder head

Oil pump

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21. The camshaft of a four stroke Diesel engine running at 1000 rpm will run at

4000 rpm

2000 rpm

1000 rpm

500 rpm

22. The crankcase dilution means

Dilution of lubrication oil by fuel in the crankcase

Dilution of mixture passing through crankcase in two stroke engines

Dilution of oil by water in the crankcase

Dilution of fuel in the crankcase

23. The Diesel engines as compared to petrol engines require

Smaller flywheel

Bigger flywheel

No flywheel

Same size of flywheel

Automobile Engineering Practice Set-8

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Automobile Engineering Practice Set-8

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