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Electrical Machines

Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1/(1-S)
 S
 1-S
 1/S

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Electrical Machines
Eb/Vt ratio of a DC motor is an indication of

 running torque.
 efficiency.
 speed regulation.
 starting torque.

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Electrical Machines
Minimum allowable resistivity of power transformer insulating oil is generally taken as

  1 X 1012 Ω - cm at 27°C and 0.1 X 1012
 2 X 1012 Ω - cm at 27°C and 0.2 X 1012
 3 X 1012 Ω - cm at 27°C and 0.3 X 1012
 4 X 1012 Ω - cm at 27°C and 0.4 X 1012

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Electrical Machines
On what factors the speed of dc motor depends?

 Armature current Ia.
 Applied voltage.
 Field flux.
 All of these.

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Electrical Machines
Transformer core is laminated to reduce

 eddy current loss.
 both 1 and 2.
 copper loss.
 hysteresis loss.

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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

None of these
 4.8% and -3.2%
 6% and -4%
 3.2% and -1.6%

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