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4

The octane rating of petrol commercially available is

A. 85-95

B. 95-100

C. 100-110

D. 110-125

Correct Answer :

A. 85-95


Related Questions

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4

In petrol engines, during suction stroke, ________ is drawn in the cylinder

A. Air and fuel

B. Only fuel

C. Only air

D. None of these

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4

The piston compression rings are made of

A. Cast iron

B. Steel

C. Aluminium

D. Bronze

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4

The main feature of Macpherson strut suspension is that

A. The vertical size of the suspension can be made more compact

B. Non vertical external forces are supported by the suspension arms

C. The unsprung mass in lighter

D. The assembly is slightly more complicated in design

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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

The condition that results in large quantities of HC emission is

A. High temperature combustion

B. Incomplete combustion

C. Low temperature combustion

D. High atmospheric temperature combustion

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4

The main function of intake manifold is that it

A. Promotes the mixture of air and fuel

B. Reduces intake noise

C. Cools the intake air to a suitable temperature

D. Distributes intake air equally to the cylinders

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4

The battery is an electrochemical device, which means battery

A. Makes chemicals by mechanical means

B. Uses chemical action to provide electricity

C. Has curved plates instead of flat plates

D. Does not use an electrolyte

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4

A clutch is usually designed to transmit maximum torque which is

A. Equal to the maximum engine torque

B. 80 % of the maximum engine torque

C. 150 % of the maximum engine torque

D. None of these

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4

The function of antilock brake system (ABS) is that is

A. Reduces the stopping distance

B. Minimises the brake fade

C. Maintains directional control during braking by preventing the wheels from locking

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

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4

The function of an alternator in an automobile is to

A. Supply electric power

B. Converts mechanical energy into electrical energy

C. Continually recharges the battery

D. Partly converts engine power into electric power

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4

Two speed reverse gear arrangements is generally provided in case of

A. Passenger cars

B. Matadors

C. Tractors

D. Trucks

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4

In case of a Diesel car, the pressure at the end of compression is of the order of

A. 15 bar

B. 25 bar

C. 35 bar

D. 45 bar

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4

The indicated power of a four stroke engine (in watts) is equal to (where P = Mean effective pressure in N/m², L = Length of stroke in metres, A = Cross-sectional area of the piston in m², and N = Speed of the engine in revolutions per second (r.p.s)

A. P.L.A.N/2

B. P.L.A.N

C. 2 × P.L.A.N

D. P.L.A.N/4

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4

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

A. Cooling efficiency

B. Resistance to wear

C. Lubrication performance

D. None of these

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4

In a single dry plate clutch, torsional vibrations are absorbed by

A. Coil springs known as torsional springs

B. Cushion springs

C. Central hub

D. Clutch pedal

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4

The advantage of having a tandem master cylinder arrangement in automobiles is that it

A. Enhances safety by serving two independent lines in a divided line brake circuit

B. Enhances safety by activating the brakes using vacuum pressure in the event of brake fluid loss

C. Supplies equal fluid pressure to each line of a divided line brake circuit, thereby preventing the brakes from dragging on one side

D. Boosts the brake fluid pressure to reduce the force required to depress the brake pedal

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4

If the air-fuel mixture in a spark ignition engine is too rich, then airfuel ratio is about

A. 17 : 1

B. 15 : 1

C. 13 : 1

D. 10 : 1

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4

The function of oil control rings is that it

A. Lubricates the cylinder wall by releasing oil from its hole

B. Keeps the cylinder wall lubricated by holding oil in its channel

C. Prevents engine oil from going into the combustion chamber and returns excess lubricating oil off the cylinder wall through the return holes in the piston to the oil pan

D. Maintains a seal and prevents escape of burned gases and oil leakage

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4

The ease with which petrol vaporizes is called its

A. Oxidation

B. Octane number

C. Volatility

D. Cetane number

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4

The compression ratio for Diesel engines usually lies in the range of

A. 6-10

B. 10-1

C. 15-25

D. 25-40

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4

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

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

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

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

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

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4

Wheel base of a vehicle is the

A. Distance between the centres of the front and rear wheels

B. Distance between the centres of the front tyres

C. Distance between the centres of the rear tyres

D. Extreme length of the vehicle

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4

The discharged lead acid battery has on its plates

A. Lead peroxide (PbO₂)

B. Spongy lead (Pb)

C. Lead sulphate (PbSO₄)

D. Sulphuric acid (H₂SO₄)

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4

The advantage of the fuel injection system over the carburettor system is

A. Improved fuel efficiency

B. Improved emission

C. Improved power output

D. All of these

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4

The connecting rods are generally made of ________ shaped crosssection.

A. I

B. C

C. L

D. H

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4

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

A. 1

B. 2

C. 3

D. 4

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4

The torque converter uses ________ to transfer torque.

A. Air

B. Automatic transmission fluid (ATF)

C. Gears

D. Steel belt

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4

The function of a connecting rod is

A. To turn the flywheel

B. To drive the drive plate

C. To drive the fuel pump

D. To transmit motion of the piston to the crankshaft

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4

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

A. R

B. 2 R

C. 4R

D. 4 R²

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4

In automobiles G.V.W. refers to

A. Gross vehicle width

B. Gross vehicle weight

C. Gross vehicle wheel base

D. Gross vehicle wheel track