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Electrical Machines

Electrical Machines
What are slot wedges in a DC machine made of?

 Mild steel.
 Silicon steel.
 Fibre.
 Cast iron.

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 440 A.
 44 A.
 400 A.
 40 A.

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Electrical Machines
Open circuit in a transformer is prefered with

 rated transformer current
 rated transformer voltage
 direct current
 high frequency supply

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Electrical Machines
The leakage reactance of a 3-phase alternator is determined by performing

 open circuit and zero power factor tests.
 short circuit and slip tests.
 zero power factor and slip tests.
 open circuit and short circuit tests.

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Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 hyperbola
 parabola
 any of the above
 linearised

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

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

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