1.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%

Answer: b
Explanation: On an average road surface rolling resistance is 1 to 2% of vehicle’s weight.

2. 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

Answer: d
Explanation: Air resistance on a vehicle depends on all the above mentioned factors.

3. 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

Answer: a
Explanation: The correct expression for air resistance is A.R = k*A*V2.

4. 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

Answer: c
Explanation: For average cars, value of coefficient of air resistance is approx 0.0032.

5. One Horse Power(H.P) is approximately equal to _____ Watts.
a) 810
b) 545
c) 634
d) 746

Answer: d
Explanation: 1 H.P = 746 Watts.

6. 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

Answer: a
Explanation: Gradient resistance depends on weight of the vehicle.

7. Power to weight ratio for high performance cars can range upto
a) 150
b) 190
c) 230
d) 280

Answer: c
Explanation: The ratio of power to weight of high performance cars can range as high as 230.

8. In a four stroke engine each cylinder has
a) One valve
b) Two valves
c) Three valves
d) Four valves

Answer: b
Explanation: A four stroke engine cylinder has one intake and one exhaust valve.

9. In a diesel engine the fuel injection pressure is in the range
a) 100 to 170 atm
b) 60 to 70 atm
c) 30 to 40 atm
d) 20 to 25 atm

Answer: a
Explanation: The pressure of fuel injection is very high for a diesel engine.

10. The valve is opened as the cam lobe on the cam raises the
a) Bearing
b) Piston
c) Valve lifter
d) Valve seat

Answer: c
Explanation: Valve opens when valve lifter is raised.