Engine cranks do no start during winter because of
1. Battery discharge
2. Weak spark
3. Worn out engine
4. Lean mixture
A. 1, 2 and 3 are correct
B. 2, 3 and 4 are correct
C. 3, 4 and 1 are correct
D. 4, 1 and 2 are correct
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The device for smoothing out the power impulses from the engine is called
A. Flywheel
B. Clutch
C. Torque converter
D. Differential
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The tractive effort increases if the wheel diameter is
A. Increased
B. Decreased
C. Not changed
D. None of these
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If BP of a four-stroke petrol engine is 28 kW and mechanical efficiency is 80%, then IP is . . . . . . . . .
A. 3.5 kW
B. 35 kW
C. 22.4 kW
D. None of the above
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The main purpose of inspection is-
A. Electrical equipment
B. Mechanical build up of chassis or frame
C. Complaints rectification and repairs
D. All are correct
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The testing equipment which gives a very close approximation of a road test in garage is called
A. Engine dynamometer
B. Chassis dynamometer
C. Engine tester
D. Tachometer
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Morse test is carried out to determine the IP of a . . . . . . . .
A. Single cylinder petrol engine
B. Single cylinder diesel engine
C. Multi cylinder engine
D. Double acting steam engine
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Which one of the following method for determination of engine friction is only applicable for diesel engines and also the gross fuel consumption is plotted against brake power and it is extended backwards to zero fuel consumption?
A. Morse test
B. Motoring method
C. Deceleration method
D. William's line method
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High performance sports car with active exhaust system allows . . . . . . . .
A. Larger flow area, reduces the restriction in the exhaust system
B. To maintain the flow area without affecting the restriction in the exhaust system
C. Smaller flow area, reduces the restriction in the exhaust system
D. None of the above
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The ratio of brake power to indicated power of an IC engine is called
A. Mechanical efficiency
B. Thermal efficiency
C. Volumetric efficiency
D. Relative efficiency
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The vibration damper on a crankshaft reduces the:
A. Longitudinal vibrations
B. Transverse vibrations
C. Torsional vibrations
D. All of these
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Mean effective pressure at a given compression ratio is maximum when the air-fuel ratio is
A. Higher than stoichiometric
B. Lower than stoichiometric
C. Equal to stoichiometric
D. None of the above
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The brake specific fuel consumption is expressed as the fuel consumed . . . . . . . .
A. Per unit time
B. Per hour per unit brake horsepower
C. Per km distance covered
D. Per hour per unit indicated horsepower
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Compression ratio of a petrol engine is
A. Higher than that of diesel engine
B. Lower than that of diesel engine
C. Equal to that of diesel engine
D. None of the above
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When two rubber blocks are inclined to each other to a 'V' mounting, the rubber will be loaded in . . . . . . . .
A. Only compression force
B. Both compression and shear forces
C. Only shear force
D. None of the above
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If the tractive effort of the vehicle at any point of time during motion is more than the resistance of vehicle, then the vehicle will be under
A. Acceleration
B. Deceleration
C. Uniform speed
D. None of these
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Relative efficiency is the ratio of
A. Brake Power to Indicated Power
B. Mechanical efficiency to Thermal efficiency
C. Actual thermal efficiency to Volumetric efficiency
D. Actual thermal efficiency to Air-standard efficiency
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For checking the performance of an automobile which of the following test is necessary?
A. Laboratory testing
B. Test bed
C. Road testing
D. All are correct
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The ratio of mass of air (or mixture) retained to the mass of trapped cylinder charge is called as . . . . . . . .
A. Trapping efficiency
B. Scavenging efficiency
C. Charging efficiency
D. Volumetric efficiency
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About how much percentage of heat energy equivalent is overcoming engine friction?
A. 30% - 40%
B. 20% - 30%
C. 15% - 25%
D. 5% - 10%
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