The aspect ratio (expressed in percentage) of the tyre is defined as the ratio of
A. Section width to section height
B. Section height to section width
C. Wheel diameter to section height
D. Wheel diameter to section width
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The composition of the electrolyte in a fully charged battery is that
A. The electrolyte is pure distilled water
B. The electrolyte is pure sulphuric acid
C. The electrolyte is a mixture of 64% distilled water and 36% sulphuric acid by weight
D. The electrolyte is a mixture of 90% distilled water and 10% sulphuric acid by weight
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The instrument used to check specific gravity of acid in a battery is
A. Hydrometer
B. Hygrometer
C. Anemometer
D. Multimeter
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The size of engine cylinder is referred in terms of its
A. Diameter and bore
B. Displacement and efficiency
C. Bore and stroke
D. Bore and length
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Clutch facings are usually attached to the plate by
A. Steel rivets
B. Brass rivets
C. Aluminium screws
D. Steel screws
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When the brake pedal free play is less than the specified value, then the
A. Brake drags
B. Brake fades
C. Vapour locking occurs in the brake lines
D. Antilock braking system malfunctions
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A petrol engine of a car develops 125 Nm torque at 2700 r.p.m. The car is driven in second gear having gear ratio of 1.75. The final drive ratio is 4.11. If the overall transmission efficiency is 90%, then the torque available at the driving wheels is
A. 8.091 Nm
B. 80.91 Nm
C. 809.1 Nm
D. 8091 Nm
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For the same maximum pressure and temperature
A. Diesel cycle is more efficient than Otto cycle
B. Otto cycle is more efficient than Diesel cycle
C. Both Otto cycle and Diesel cycle are equally efficient
D. None of the above
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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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The major purpose of an electronically controlled automatic transmission is that this type of transmission
A. Eliminates gear clutches
B. Eliminates the gear shaft lever
C. Reduces the number of automatic transmission components
D. Reduces shift shock and achieves more efficient transmission of engine torque
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The basic purpose of providing caster angle on wheels is to
A. Prevent uneven tyre wear
B. Maintain directional control
C. Bring the road contact of the tyre under the point of load
D. Compensate for wear in the steering linkage
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The coefficient of rolling resistance for a truck weighing 63,500 N is 0.018. The rolling resistance to the truck is
A. 1.143 N
B. 11.43 N
C. 114.3 N
D. 1143 N
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Instead of valves, the ports are used in case of
A. Four stroke I.C. engines
B. Two stroke I.C. engines
C. V6 engines
D. None of these
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An overinflated tyre will wear the tread most near the
A. Edges
B. Corners
C. Centre
D. None of these
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The connecting rods are generally made of __________ shaped cross-section.
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The problems caused by the wheel imbalance are
A. Hard steering and hard ride
B. Poor acceleration and hard steering
C. Steering wheel vibrations and uneven tyre wear
D. Poor acceleration and reduced fuel efficiency
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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
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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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If the air-fuel mixture in a spark ignition engine is too rich, then air-fuel ratio is about
A. 17 : 1
B. 15 : 1
C. 13 : 1
D. 10 : 1
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The service brakes employed in cars are generally operated
A. Mechanically
B. Hydraulically
C. Pneumatically
D. None of these
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