Automobile Engineering Practice Set-8

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

An electric spark

The heat of compression

None of these

The hot exhaust

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

Contamination

Vibration

Temperature

Humidity

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

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

Reduces the stopping distance

Minimizes the brake fade

Maintains directional control during braking by preventing the wheels from locking

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

Oil pump

Oil pan

Cylinder head

Separate oil tank

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

(a) Both valves are closed

(b) Both valves are open

(d) None of these

(c) Both 'A' and 'B'

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

Cleaning

Tapping

Bleeding

Trapping

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

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

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

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

The internal gear is fixed to the planetary gear.

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

1

4

3

2

9. The oil pump is driven by the

Alternator shaft

Crankshaft directly

Crankshaft via drive belt

Camshaft

10. The crankcase dilution means

Dilution of mixture passing through crankcase in two stroke engines

Dilution of fuel in the crankcase

Dilution of oil by water in the crankcase

Dilution of lubrication oil by fuel in the crankcase

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

Low temperature combustion

Insufficient air during combustion

Insufficient fuel during combustion

High temperature combustion

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

Exhaust compression power suction

Suction exhaust power compression

Suction compression power exhaust

Suction power compression exhaust

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

500 rpm

4000 rpm

1000 rpm

2000 rpm

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

Taper roller bearing

Needle roller bearing

Ball bearings

Plain bearings

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

4

2

1

3

16. A maintenance free battery

Does not contain water

Has lead-calcium plate grid

Has lead-antimony plate grid

Does not contain acid

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

Piston walls

Crown of the piston

Piston rings

Skirt of the piston

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

Keeping the vehicle without use for an extended period

Overcooling of the brakes during high speed driving

An excessively high engine speed on a downhill road

Overheating of the fluid due to frequent brake application

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

1143 N

11.43 N

1.143 N

114.3 N

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

Octane number

Cetane number

Performance number

None of these

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

Steering wheel

Steering shaft

Steering gearbox

Tie rod

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

Front axle

Seats

Wheels

Steering system

23. The Diesel engines as compared to petrol engines require

No flywheel

Smaller flywheel

Bigger flywheel

Same size of flywheel

Automobile Engineering Practice Set-8

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Automobile Engineering Practice Set-8

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