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 directional proporational to torque
Its torque is proportional to the square of the armature current and speed is inversely proportional 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)
A Mho relay is a

Directional restrained over current relay
Directional restrained over voltage relay
Voltage restrained directional relay
Voltage controlled over current relay

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DGVCL Exam Paper (11-12-2011)
Due to skin effect

Portion of the conductor near the surface carries more current and the core of the conductor carries less current
Current flows through the half cross section of the conductor
Portion of the conductor near the surface carries less current and the core of the conductor carries more current
Uniform current flows through the conductor

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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
Amount of copper in the winding
Size of the machine
Cost of the machine

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DGVCL Exam Paper (11-12-2011)
The corona effect can be minimized by increasing

The length of the conductor
Both spacing between the conductors and diameter of the conductor
Diameter of the conductor
Spacing between the conductors

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