DGVCL Exam Paper (11-12-2011)
The bus bar zone faults are generally

Three phase short ciruits
Phase to phase faults
Double line to ground faults
Single line to ground faults

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

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

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DGVCL Exam Paper (11-12-2011)
The motor used in celling fans is

Capacitor start motor
Capacitor start capacitor run motor
Split phase motor
Universal motor

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