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Electrical Machines

Electrical Machines
Which of the following represents the pitch factor?

 Cos (α/2)
 Cos α²
 Cos α
 sin (α/2)

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Electrical Machines
The armature of a DC motor is laminated to reduce

 copper loss.
 friction and windage loss.
 hysteresis loss.
 eddy current loss.

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms is connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 340 A.
 570 A.
 460 A.
 250 A.

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

 less and thin
 less and thick
 large and thick
 large and thin

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Electrical Machines
In electric locomotives which of the following motor are used ?

 DC Shunt motor.
 DC series motor.
 Synchronous motor.
 DC compound motor.

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Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 0.9 lag
 0.2 lag
 0.2 lead
 unity

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