DGVCL Exam Paper (11-12-2011)
All the peripheral devices connected to a computer require power to work. Which of the following voltages is required for the motherboard to work?

DC
Negative cycle of sine wave
Positive cycle of sine wave
AC

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

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

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

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

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