DGVCL Exam Paper (11-12-2011)
Distribution transformers have good all day efficiency due to

Low voltage
Low copper as well as iron loss
Low iron loss
Low copper loss

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DGVCL Exam Paper (11-12-2011)
DC series motors are best suited for traction work because

Torque and speed are inversely proportional to the square of the armature current
Torque and speed are proportional to the square of the armature current
Its torque is proportional to the square of the armature current and speed is inversely proportional to torque
Its torque is proportional to the square of the armature current and speed is directional proporational to torque

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DGVCL Exam Paper (11-12-2011)
The advantage of slipring induction motor over the squirrel cage induction motor is

It is suitable for higher speeds
It can be started with the help of rotor resistances
It has a higher efficiency
It's power factor is higher

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