Automobile Engineering in ME
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

8.091 Nm
809.1 Nm
80.91 Nm
8091 Nm

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Automobile Engineering in ME
The condition that causes vapour locking in a brake system is

Keeping the vehicle without use for an extended period
Overheating of the fluid due to frequent brake application
An excessively high engine speed on a downhill road
Overcooling of the brakes during high speed driving

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Automobile Engineering in ME
In a ventilated disc brake

Disc contains many small holes for optimum cooling performance
Disc contains radial vanes between its rubbing surfaces for optimum cooling performance
A duct directs air towards the caliper for cooling while the vehicle is moving
Caliper is covered with cooling fins

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