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Electrical Machines

Electrical Machines
The heat generated in the transformer is dissipated mainly by

 conduction.
All of these
 radiation.
  convection.

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

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

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Electrical Machines
Which of the following motor is not suitable for frequent starting and stopping?

All of these
 Resistance split phase motor
 Capacitor run motor
 Capacitor split phase motor

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Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

  2 Hz.
  3 Hz.
 50 Hz.
 10 Hz.

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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

 44 A.
 440 A.
 400 A.
 40 A.

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Electrical Machines
If a shunt generator delivers 100 A at 200 V, and the resistances of the shunt field and armature are 100 ohms and 0.01 ohms respectively, the generator emf will be

  parallel.
  series.
  no resistance is connected.
  any one of the connection.

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