Automobile Engineering Questions and Answers – Performance of an Automobile

This set of Automobile Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Performance of an Automobile”.

1. What is the power delivered by the engine to the crankshaft called?
a) Shaft power
b) Horse power
c) Brake power
d) None of the mentioned
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2. If ‘T’ is torque(in Nm) and ‘N’ is speed(in rpm) then the required expression for Brake power ‘B.P’ in kWs is _________
a) 2πNT/6000
b) 2πNT/60000
c) πNT/6000
d) πNT/60000
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3. The torque available at the contact between road and driving wheel is called _________
a) Brake power
b) Friction power
c) Tractive effort
d) Engine torque
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4. If ‘V’ is vehicle speed(in metres/min) and ‘R’ is radius of driving wheel(in metres) then the rpm of the driving wheel is given by _______
a) rpm = V/2πR
b) rpm = 2πV/R
c) rpm = πR/V
d) rpm = πV/R
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5. Which of these is not a power loss which takes place between engine and driving wheel?
a) Power loss due to friction of piston bearings and gears
b) Power loss from clutch to drive wheel due to friction of various parts
c) Transmission line loss
d) None of the mentioned
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6. The force that opposes the motion of a vehicle is _______
a) Rolling resistance
b) Gradient resistance
c) Wind or air resistance
d) All of the mentioned
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7. Rolling resistance doesnot depend on which of the following factors?
a) Load on each road wheel
b) Radius of driving wheel
c) Wheel inflation pressure
d) Nature of road surface
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8. For an average type of road surface what percentage of vehicle’s weight constitutes rolling resistance?
a) 5 to 10%
b) 1 to 2%
c) 2 to 5%
d) 0 to 3%
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9. Wind or air resistance depends on which of the following factors?
a) Shape and size of vehicle body
b) Air velocity
c) Speed of vehicle
d) All of the mentioned
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10. If ‘k’ is coefficient of air resistance, ‘A’ is frontal area projected by the vehicle in square metres and ‘V’ is vehicle speed(in km/h) then the expession for air resistance ‘A.R’ on the vehicle is _________
a) A.R = k*A*V^2
b) A.R = k*A*V^3
c) A.R = 2k*A*V
d) A.R = k*A*V
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11. The value of coefficient of air resistance for average cars is approximately equal to __________
a) 0.32
b) 0.032
c) 0.0032
d) 1.32
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12. One Horse Power(H.P) is approximately equal to _____ Watts.
a) 810
b) 545
c) 634
d) 746
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13. Gradient resistance for a vehicle depends on which of the following factors?
a) Weight of the vehicle
b) Size of the vehicle
c) Width of tyres
d) Speed of the vehicle
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14. Power to weight ratio for high performance cars can range up to _______
a) 150
b) 190
c) 230
d) 280
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Sanfoundry Global Education & Learning Series – Automobile Engineering.

To practice all areas of Automobile Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers.