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Electrical Machines

Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 high and low
 low and low
 low and high
 high and high

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Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

 2 alone
 1 and 2
 1, 2 and 3
 1 and 3

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Electrical Machines
Ratio of starting torque to full load torque is minimum in

  Differential compound motor.
  Cumulative compound motor.
  Shunt motor.
  Series motor.

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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

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

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Electrical Machines
A 3 - Φ, 4 pole IM is supplied from a 50 Hz source. Calculate rotor frequency when rotor runs 600 rpm?

 20 Hz.
  Can be determined.
 35 Hz.
  30 Hz.

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Electrical Machines
The slot edges in a DC machine are made of

 Silicon steel.
 Cast iron.
 Mild steel.
  Fibre.

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