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Electrical Machines

Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

  0.54.
 0.3.
 0.7.
  1.

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Electrical Machines
If in DC Shunt Motor the flux is reduced suddenly to zero, then

 the speed of motor will be reduced.
 the armature current will reduce.
 the motor will attain dangerously high speed.
 the motor will come to stop.

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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

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

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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

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

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors with armature resistance of 0.6 ohm. Calculate the starting current flowing through the armature if the supply voltage is 240 volt.

  0.5 Amp.
 320 Amp.
 800 Amp.
  400 Amp.

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Electrical Machines
Series field consists of--------number of turns and ---------- conductors respectively

 large and thick
 less and thin
 large and thin
 less and thick

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