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Current Affairs January 2024

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4

The power source for a brake booster is

A. Exhaust manifold pressure

B. Electricity

C. The pressure difference between the atmospheric pressure and the vacuum pressure in the intake manifold

D. Hydraulic pump

Correct Answer :

C. The pressure difference between the atmospheric pressure and the vacuum pressure in the intake manifold


Related Questions

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4

In radial tyres

A. One ply layer runs diagonally one way and another layer runs diagonally the other way

B. All plies run parallel to one another and vertical to tyre bead

C. Inner tubes are always used

D. None of these

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4

With the increase of battery temperature, the specific gravity of electrolyte

A. Increases

B. Decreases

C. Remains the same

D. None of these

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4

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

A. Ball bearings

B. Plain bearings

C. Needle roller bearing

D. Taper roller bearing

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4

The Diesel engines are also known as

A. Spark ignition (S.I.) engines

B. Compression ignition (C.I.) engines

C. Steam engines

D. None of these

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4

The negative plates of a lead acid battery has

A. Lead peroxide (PbO₂)

B. Spongy lead (Pb)

C. Lead sulphate (PbSO₄)

D. Sulphuric acid (H₂SO₄)

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4

It is necessary to maintain the valve clearances as they

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

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

C. Increase the speed at which the valves move up and down

D. Make the crankshaft turn smoothly

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4

The temperature at which tyre inflation pressure should be checked is

A. 20°C

B. 25°C

C. 35°C

D. Ambient temperature

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4

When the battery is half (50%) charged, the specific gravity of acid in a battery is usually

A. 0.74

B. 1.00

C. 1.12

D. 1.19

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4

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

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

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

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

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

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4

The minimum parking brake force is generally ________ of gross vehicle mass (GVM).

A. 5 %

B. 10 %

C. 15 %

D. 20 %

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4

The function of an oil control orifice is that it

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

B. Turns oil into fine mist for spray lubrication

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

D. Removes impurities from cylinder head lubricating oil

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4

The auto ignition in a spark ignition engine means

A. Automatic ignition of the charge at the end of compression

B. Ignition induced by the passage of a spark

C. Ignition of the charge before the passage of flame front

D. Ignition induced to supplement the process of normal combustion

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4

If the spark plug deposit indicates black coating of soot, it indicates that the engine has been generally operating on

A. Too lean mixture

B. Stoichiometric mixture

C. Most economical mixture

D. Too rich mixture

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4

The crankcase dilution means

A. Dilution of fuel in the crankcase

B. Dilution of oil by water in the crankcase

C. Dilution of lubrication oil by fuel in the crankcase

D. Dilution of mixture passing through crankcase in two stroke engines

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4

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

A. Wheels

B. Front axle

C. Steering system

D. Seats

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4

The firing order for an inline four cylinder I.C. engine is

A. 1-2-3-4

B. 1-3-4-2

C. 1-2-4-3

D. 1-3-2-4

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4

The path taken by intake air is

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

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

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

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

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4

The temperature indicating instrument in vehicles indicates the temperature of

A. Engine piston

B. Engine cylinder

C. Lubricating oil

D. Jacket cooling water

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4

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

A. Increases the combustion temperature

B. Creates swirl

C. Maintains a seal and prevents the fuel leakage

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

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4

Which of the following symptom is caused as a result of brake disc run out?

A. Ineffectiveness of the brakes

B. Judder during braking

C. Localized wearing of the brake pads

D. Rapid wearing of the brake pads

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4

Cushioning springs in clutch plate reduces

A. Vehicle speed

B. Torsional vibrations

C. Jerky starts

D. None of these

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4

In Spark Ignition Engine

A. Only air is introduced into the cylinder

B. The mixture of air and fuel is introduced into the cylinder from carburettor

C. Both A and B

D. None of these

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4

Two advantages of using helical gears rather than spur gears in a transmission system are

A. Strength and cost

B. Strength and less end thrust

C. Noise level and strength

D. Noise level and economy

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4

The maximum torque multiplication ratio in a torque converter is about

A. 2.5

B. 10

C. 25

D. 40

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4

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

A. Less than 20 kmph

B. Less than 40 kmph

C. Less than 60 kmph

D. More than 60 kmph

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4

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

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

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

C. 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

D. Recharging of a maintenance free battery is neither required nor possible

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4

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

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

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

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

D. The internal gear is fixed to the planetary gear.

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4

The connecting rod connects the piston and the

A. Cylinder head

B. Cylinder block

C. Camshaft

D. Crankshaft

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4

The characteristic that is enhanced by the use of cylinder sleeves is

A. Cooling efficiency

B. Resistance to wear

C. Lubrication performance

D. None of these

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4

In a four stroke engine for each crankshaft revolution, the camshaft revolves

A. One half turn

B. One turn

C. Two turns

D. Four turns