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Electrical Machines

Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 25 Hz
 0 Hz
 50 Hz
 100 Hz

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Electrical Machines
A motor operates in stable region at which of the following slip?

 high slip region
 both 1 and 2
 unity slip
 low slip region

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Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

 0.25.
 0.72.
 0.62.
 1.24.

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Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

 RBY
 BYR
All of these
 BRY

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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, 2 and 3
 1 and 2
 1 and 3

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Electrical Machines
A DC series motor must started on no load because it would

 Fail to start without load.
 Not develop starting torque.
 Draw more current without producing sufficient torque.
  Run at dangerously high speed.

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