Main traction systems used in India are, those using

Which of the following is the disadvantage of electric traction over other systems of traction?

A

Corrosion problems in the underground pipe work

B

Short time power failure interrupts traffic for hours

C

High capital outlay in fixed installations beside route limitation

D

Interference with communication lines

Which of the following is an advantage of electric traction over other methods of traction?

A

Faster acceleration

B

No pollution problems

C

Better braking action

D

All of the above

Which one of the following surfaces will give highest coefficient of traction while using crawler track tractors?

A

Ice

B

Concrete

C

Loose sand

D

Earth

_______ was the first city in India to adopt electric traction.

A

Delhi

B

Madras (Chennai)

C

Calcutta (kolkata)

D

Bombay (Mumbai)

Skids occur when the brakes are applied so hard that the front or rear wheels lose traction are called as

A

Cornering

B

BLowout

C

Power

D

Braking

Which of the following motors is preferred for traction work?

A

Universal motor

B

D.C. series motor

C

Synchronous motor

D

Three-phase induction motor

Why are the D.C. motors preferred for traction applications?

A

Torque and speed are inversely proportional to armature current

B

Torque is proportional to armature current

C

Torque is proportional to square root of armature current

D

The speed is inversely proportional to the torque and the torque is proportional to square of armature current

Series motor is not suited for traction duty due to which of the following account?

A

Less current drain on the heavy load torque

B

Current surges after temporary switching off supply

C

Self relieving property

D

Commutating property at heavy load

_________ frequency is not common in low frequency traction system

A

40 Hz

B

25 Hz

C

16 Hz

D

None of these

An ideal traction system should have

A

Easy speed control

B

High starting tractive effort

C

Equipment capable of withstanding large temporary loads

D

All of the above

Main traction systems used in India are, those using

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