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Electrical Machines

Electrical Machines
In dc motors, under leading pole tips flux density will--------?

 decrease
None of these
 either increase or decrease
 increase

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Electrical Machines
The brush-axis of a bipolar dc motor is rotated by 90°. The effect of this rotation on the back emf Eband the torque developed Tdwould be such that

 both Eb and Td are zero
 both Eb and Td are unchanged
 Eb is zero, but Td is unchanged
 Eb is unchanged, but Td is zero

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Electrical Machines
The application that need frequent starting and stopping is

  blowers.
  jaw crushers.
  paper mills.
  lifts and hoists.

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Electrical Machines
What is the frequency of a alternator, if P = number of poles and N = revolution made per second?

 120 / PN Hz.
  PN / 2 Hz.
 120P / N Hz.
 120N / P Hz.

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Electrical Machines
Armature reaction depends on which of the following?

None of these
 power factor of load
 both 1 and 2
 magnitude of load current

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Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is

 0.16 pu.
  0.08 pu.
  0.02 pu.
 0.01 pu.

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