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Electrical Machines

Electrical Machines
Hopkinson test is conducted under which of the following condition?

 any of the above
 no load
 full load
 half load

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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. Calculate the back emf produced when it is running at a speed of 1500 rpm.

 230 volt.
  220 volt.
 240 volt.
 440 volt.

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Electrical Machines
The polarity of a DC generator can be reversed by

 any of above.
 reversing the field current.
 increasing field current.
 reversing field electric current as well as direction of rotation.

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Electrical Machines
In electric locomotives which of the following motor are used ?

 DC compound motor.
 DC series motor.
 Synchronous motor.
 DC Shunt motor.

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Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

 1000W
 3000W
 500W
 100W

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

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