DGVCL Exam Paper (11-12-2011)
The form factor in AC means the ration of

R.M.S. value to average value
R.M.S. value to peak value
Peak value to r.m.s value
Peak value to average value

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DGVCL Exam Paper (11-12-2011)
The main advantage of using fractional pitch winding is to refuce

Amount of copper in the winding
Harmonics in the generated emf
Cost of the machine
Size of the machine

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DGVCL Exam Paper (11-12-2011)
Two parallel conductors are carrying the current in the same direction. Which of the following statements is correct?

There is an attracting force between the conductors
The force increases when the distance between the conductors is increased
There is a repelling force between the conductors
The force increases when the distance between the conductors is decreased

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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
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
Torque and speed are proportional to the square of the armature current

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