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Electrical Machines

Electrical Machines
Which type of motors are preferred in lifts?

 DC shunt motors.
 DC series motors.
None of these
 DC compound motors.

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Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

 double.
 4 times.
 half.
 one fourth.

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Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 rectangular
 sinusoidal
 co- sinusoidal
 flat-topped

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

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Electrical Machines
Voltage regulation can be determined by which of the following?

All of these
 MMf method.
 ZPF method.
 Synchronous impedance method.

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Electrical Machines
Direction of the current in the compensating winding is________ to the direction of current in the armature conductors?

None of these
 exactly opposite
 either of these
 same

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