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Electrical Machines

Electrical Machines
The output voltage of a DC generator is

 E = V – IaRa.
 E = V + Ra.
 E = V + Ia.
  E = V + IaRa.

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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 Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly

 240 V
 140 V
 120 V
 175 V

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Electrical Machines
The output power of any electrical motor is taken from the

 Coupling mounted on the shaft.
 Motor frame.
 Field.
 Armature.

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Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

 36.36% increase
 18.18% increase
 36.36% decrease
 36.36% increase

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Electrical Machines
The functions of inter poles are

 both 1 and 2
 nullify reactance voltage and improve the commutation.
None of these
 reduce cross magnetization effect and improve commutation

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