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The compression ratio in petrol engine is kept less than in Diesel engine because

A. It makes petrol engines lighter

B. Higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition

C. Less compression ratio gives better performance

D. It is just customary to have less compression ratio in petrol engines

Correct Answer :

B. Higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition


Related Questions

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4

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

A. 3-speed gear box

B. 4-speed gear box

C. 5-speed gear box

D. 6-speed gear box

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4

In aluminium cylinder blocks, the cylinder liners are made of

A. Aluminium

B. Ceramic

C. Brass

D. Cast iron

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4

The most commonly used power plant in automobiles is

A. Gas turbine

B. I.C. engine

C. Battery

D. None of these

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4

The gradient resistance to a vehicle having a mass of 980 kg moving on an incline of 10° is

A. 1.6694 N

B. 16.694 N

C. 166.94 N

D. 1669.4 N

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4

In vehicles with tilt steering, the steering column is pivoted in

A. Upper bracket

B. Lower bracket

C. Tilt bracket

D. Steering yoke joint

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4

Which of the following indicates multigrade oil?

A. SAE 30

B. API SF

C. SAE 20 W50

D. API 50

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4

In a Diesel engine, the function of a fuel injector is to

A. Mix the fuel and air

B. Ignite the air-fuel mixture

C. Provide flame front for ignition

D. Spray atomized fuel in the cylinder

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4

In a ventilated disc brake

A. A duct directs air towards the caliper for cooling while the vehicle is moving

B. Caliper is covered with cooling fins

C. Disc contains many small holes for optimum cooling performance

D. Disc contains radial vanes between its rubbing surfaces for optimum cooling performance

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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

The engine oil is stored in __________ when the engine is not running.

A. Oil pan

B. Cylinder head

C. Oil pump

D. Separate oil tank

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4

The information provided by the oxygen (O₂) sensor to the feedback control system is about the

A. Air-fuel ratio

B. Air temperature

C. Air flow speed

D. Exhaust gas volume

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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

In a petrol engine, the high voltage for spark plug is in the order of

A. 1000 volts

B. 2000 volts

C. 11 kilovolts

D. 22 kilovolts

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4

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

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

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

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

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

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4

The motion of the cam is transferred to the valves through

A. Pistons

B. Rocker arms

C. Camshaft pulley

D. Valve stems

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4

The octane number of compressed natural gas (CNG) is

A. 90

B. 100

C. 110

D. 120

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4

The diagram which shows the correct crank positions corresponding to the opening and closing of the valves, is known as

A. Indicator diagram

B. Axial force diagram

C. Valve timing diagram

D. None of these

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4

The connecting rod is attached to the piston by the

A. Cap bolt

B. Piston pin

C. Cap roller bearing

D. Rod cap

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4

The purpose of a balancer shaft is to

A. Balance the timing in the movement of the two groups of pistons

B. Increase inertia force of the rotating crankshaft

C. Reduce vibrations caused by the crankshaft rotation

D. Adjusts the timing of the intake and exhaust valve openings

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4

Engine misfiring is likely to result from

A. Spark plug gap too small

B. Spark plug gap too wide

C. Vapours lock in the fuel only

D. Incorrect fuel air mixture

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4

The most accurate ignition system of a spark ignition engine is

A. Magneto system

B. Battery system

C. Electronic control unit system

D. Magneto and electronic system

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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 purpose of turning radius gauges is to measure the

A. Contact areas of the tyres

B. Free plays of the steering wheel

C. Turning radius of the left and right wheels

D. Difference in the toe angles of the left and right wheels

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4

The ignition coil is used to

A. Step up current

B. Step down current

C. Step up voltage

D. Step down voltage

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4

The parking brake generally acts on

A. Front wheels

B. Rear wheels

C. Front and rear wheels

D. Propeller shaft

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4

An overinflated tyre will wear the tread most near the

A. Edges

B. Corners

C. Centre

D. None of these

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4

Bead wires are made of

A. Steel

B. Copper

C. Zinc

D. Aluminium

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4

The exhaust gas from petrol engine contains

A. Petrol vapours

B. Water vapours

C. Carbon monoxide

D. All 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 ball joints are used on the tie rod ends, because they

A. Reduce the amount of noise generated

B. Reduce the amount of sliding resistance

C. Can deal with movement of the suspension both vertically and in other directions

D. Improve the force transmission speed