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Electrical Machines

Electrical Machines
Regenerative braking is not found in which motor?

 DC shunt.
  DC series.
 DC compound.
 Induction motor.

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Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

 T∝ P
 T is independent of P
 T∝ P²
 T∝ P³

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Electrical Machines
What will be the e.m.f. generated by a 4 pole lap connected DC Generator rotating at 1500 r.p.m.? Its flux per pole is 0.4 mWb and total no of armature conductors is 1000.

 10 volts.
 40 volts.
 20 volts.
 30 volts.

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Electrical Machines
A single phase transformer has specifications as 250 KVA, 11000 V/415 V, 50 Hz. What are the values of primary and secondary currents?

 primary = 11.4 A, secondary = 301 A
 primary = 301 A, secondary = 22.7 A
 primary = 22.7 A, secondary = 602.4 A
 primary = 602 A, secondary = 22.7 A

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Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then

 I1 = KI2 + Iμ.
 I1 = KI2.
 I1 = KI2 + Iw.
  I1 = KI2 + Iw + Iμ.ok

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

 increase.
None of these
 decrease.
 either of these.

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