Automobile Engineering Practice Set-2

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

2000 volts

1000 volts

22 kilovolts

11 kilovolts

12. When the battery is half (50%) charged, the specific gravity of acid in a battery is usually

0.74

1.12

1.19

1.00

13. The petrol engine works on

Rankine cycle

Otto cycle

Diesel cycle

Carnot cycle

14. The rigid suspension is beneficial when

It is desired to have more flexibility in design

Large changes in load make it necessary to have a large suspension stroke

It is desired to improve tyre to ground contact characteristics

It is desired to reduce the unsprung mass

15. The difference between DOT 3 and DOT 4 brake fluids is

DOT 4 fluids have a lower boiling point than DOT 3 fluid

DOT 4 fluid is more resistant to freezing than DOT 3 fluid

DOT 4 fluids have a higher boiling point than DOT 3 fluid

DOT 3 and DOT 4 fluids have the same boiling point, but DOT 4 fluid has a longer service life

16. Thinner is added to the paint in order to

Make paint film hard

Optimise its viscosity

None of these

Make pigments and resin mix easily

17. The air gap between the central electrode and ground (or side) electrode of a spark plug is around

0.5 mm

1 mm

1.5 mm

0.2 mm

18. 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

8091 Nm

80.91 Nm

8.091 Nm

809.1 Nm

19. In radial tyres

None of these

Inner tubes are always used

One ply layer runs diagonally one way and another layer runs diagonally the other way

All plies run parallel to one another and vertical to tyre bead

20. The problems caused by the wheel imbalance are

Poor acceleration and hard steering

Steering wheel vibrations and uneven tyre wear

Poor acceleration and reduced fuel efficiency

Hard steering and hard ride

Automobile Engineering Practice Set-2

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