Automobile Engineering Practice Set-5

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1. The ignition in a spark ignition engine takes place when the piston is

Exactly at the T.D.C. position on its compression stroke

Approaching the T.D.C position on its exhaust stroke

Leaving the T.D.C. position on its compression stroke

Approaching the T.D.C. position on its compression stroke

2. The main function of a resonator is that it

Regulates the intake air temperature

Regulates the intake air flow rate

Reduces the intake air noise

Enhances intake efficiency

3. The mechanical efficiency (ηm) of an I.C. engine is equal to (where I.P. = Indicated power, B.P. = Brake power and F.P. = Frictional power)

F.P/B.P.

B.P/F.P.

I.P/B.P.

B.P/I.P.

4. The lubrication oil flow in an engine is in the order as

Oil strainer, oil pump, relief valve, oil filter, cylinder head, cylinder block and oil pan

Oil pump, oil strainer, relief valve, oil filter, cylinder block, cylinder head and oil pan

Oil strainer, oil pump, relief valve, oil filter, cylinder block, cylinder head and oil pan

Oil strainer, oil filter, relief valve, oil pump, cylinder block, cylinder head and oil pan

5. The purpose of a cylinder head gasket is to

Prevent the combustion gases from leaking from the joint between the cylinder block and the cylinder head

None of the above

Removes impurities from cylinder head lubricating oil

Prevent engine oil from going into combustion chamber

6. Damper is also known as

Torsion bar

Radius rod

Spring

Shock absorber

7. The starting system includes

A battery, a distributor, and an ignition switch

A battery, a starter, and an ignition switch

A battery, a starter, and a distributor

A distributor, a starter, and an ignition switch

8. A three way catalytic converter

Burns fuel vapour gases

Reduces N₂, H₂O, and CO₂ emission levels

Removes CO, HC, and NO₂ from the exhaust gases passing through it

Re-circulates exhaust gases

9. A laminated glass upon cracking

Breaks into the form of crystals

Bursts into granular pieces

Bursts into sharp edged fragments

Sandwiched layer traps the fragments

10. The damper fluid leakage typically occur from

Bottom of damper

Upper damper mounting

Clearance between inner and outer tubes of damper

Coil spring mounting

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11. The best fuels for compression ignition engines are

Naphthalene

Aromatics

Branched chain paraffin

Straight chain paraffin

12. The main characteristics of a maintenance free (MF) battery is that

A maintenance free battery has a relatively short shelf life when compared with standard batteries

A maintenance free battery requires little maintenance during normal use and it is sufficient to add water instead of an electrolyte containing sulphuric acid

Recharging of a maintenance free battery is neither required nor possible

Since it is sealed, the water in maintenance free battery is not lost through evaporation thus accordingly it is not necessary to top up the cells with water

13. Vulcanizing means

Melting rubber while stirring it

Spraying with special paint

Heating rubber under pressure

None of these

14. Which of the following is not an automobile?

Aeroplane

Truck

Passenger car

Motor cycle

15. The tyre rotation is generally done at

1000 km

4000 km

6000 km

10,000 km

16. The purpose of adding pigment to the paint is that it

Optimises the viscosity of paint

Makes paint film hard

None of the above

Gives colour and filling up effect to the paint

17. The function of an oil control orifice is that it

Returns cylinder head lubricating oil to the oil pan at high speed

Regulates the pressure of engine oil supplied by the oil pump for the lubrication of cylinder head mechanism and other purposes

Turns oil into fine mist for spray lubrication

Removes impurities from cylinder head lubricating oil

18. The materials used for cylinder block are

Cast iron and aluminium alloy

Steel and aluminium alloy

Brass and steel

Cast iron and steel

19. Which of the following parameter can be adjusted by modifying the tie rod attachment length?

Steering gear ratio

Camber

Caster

Toe

20. The order in which effort applied to the steering wheel is transferred to the front wheel is

Steering wheel, tie rod, steering gearbox, steering shaft, steering knuckle, front wheels

Steering wheel, steering shaft, steering gearbox, steering knuckle, tie rod, front wheels

Steering wheel, steering gearbox, steering shaft, tie rod, steering knuckle, front wheels

Steering wheel, steering shaft, steering gearbox, tie rod, steering knuckle, front wheels

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21. The fuel pump in the programmed fuel injection (PFI) system is located

On the distributor mounting in the engine compartment

In the fuel tank

On the engine compartment bulkhead

Between the fuel filler pipe and fuel tank

22. The material generally used for cylinder sleeves is

Aluminium

Ceramic

Cast iron

Fibre reinforced plastic

23. The rolling resistance is because of the friction between the

Wheel rim and tyre

Wheel rim and road surface

None of these

Tyre and the road surface

24. A battery can be charged by

Applying voltage in the reverse direction to that of charging

Adding sulphuric acid

Adding distilled water

Applying a voltage in the same direction to that of charging

25. An under-inflated tyre will wear the tread most

Near the edges

Near the centre

In the cross direction

In the lateral direction

26. When turning a corner

All of the above

The front wheels are toeing out

The front wheels are turning on different angles

The inside front wheels has a greater angle than the outside wheel

27. When the front wheels of a vehicle are locked during braking, then

Driver loses control over the steering, and the vehicle continues moving in its current direction

Front tyres skid across the road surface, and the vehicle spins around

Stopping distance becomes extremely long

Rear tyres skid across the road surface, and the vehicle spins around

28. A front stabilizer bar is used to

Increase vehicle load carrying capacity

All of the above

Control suspension movement and body roll

Provide a softer ride

29. The timing belt is attached to the camshaft pulley and

Alternator pulley

Timing belt drive pulley

Radiator fan pulley

Distributor

30. The basic purpose of tyre rotation on automobiles is to

Get better ride

Avoid ply separation

Equalize wear

None of these

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31. During suction stroke, the inside pressure of cylinder is

None of these

More than the atmospheric pressure

Equal to the atmospheric pressure

Less than the atmospheric pressure

32. The most accurate ignition system of a spark ignition engine is

Battery system

Magneto and electronic system

Magneto system

Electronic control unit system

33. An oil filter bypass valve opens when the

Engine is cold

Engine overheats

Engine runs at high speed

Oil filter becomes clogged

34. Instead of valves, the ports are used in case of

None of these

Four stroke I.C. engines

V6 engines

Two stroke I.C. engines

35. In which of the following conditions, the idle CO percentage should be measured with the vehicle?

Headlights and other electrical devices are switched on

Headlights and other electrical devices are switched off

Headlights and other lights are switched off

Headlights are switched on

36. Caster is a

(B) Backward tilt of the kingpin

(A) Forward tilt of the kingpin

(D) None of these

37. The combustion process in a Diesel engine is a

Adiabatic process

Constant volume process

Constant pressure process

Constant temperature process

38. The included angle is the sum of the

Camber and S.A.I.

Camber and toe in

Camber and castor

Castor and S.A.I.

39. The function of a proportioning control valve (PCV) in a brake system is to

Cause less brake fluid pressure to act on the rear brakes than on the front brakes when the fluid pressure exceeds a predetermined level

Reduce the brake fluid pressure when the brakes approach their lockup point

Cause less brake fluid pressure to act on the front brakes than on the rear brakes when the fluid pressure exceeds a predetermined level

Ensure that equal pressure is supplied to the front and rear brakes throughout every braking operation

40. When a gear box has four forward speeds and one reverse speed, it is said to be a

3-speed gear box

4-speed gear box

5-speed gear box

6-speed gear box

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41. The fuel pump of a programmed fuel injection (PFI) system operate for two seconds when the ignition is turned to the start position to

Enable the pump's fault diagnosis function to operate

Warm up and lubricate the pump

Supplies a large amount of fuel and thereby creates a choke effect

Pressurise the fuel system before the engine is started

Automobile Engineering Practice Set-5

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