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Electrical Machines

Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

 decrease
 increase
 either increase or decrease
None of these

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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
 36.36% increase
 36.36% decrease
 18.18% increase

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

  600 rpm.
  3600 rpm.
  500 rpm.
  3000 rpm.

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Electrical Machines
Demagnetization effects which of the following?

 commutation
 both B and C
 reduction in main field flux
 reduces the terminal voltage

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Electrical Machines
Copper brushes in DC machine are used

 where low voltage and high currents are involved.
 in both of above cases.
 where high voltage and low current.
None of these

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

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

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