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Electrical Machines

Electrical Machines
Which type of motors are preferred in lifts?

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

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Electrical Machines
Cross magnetization effects which of the following?

 commutation
 reduces the terminal voltage
 reduction in main field flux
 both 2 and 3

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Electrical Machines
Which of the following motor has more stability

None of these
 cylindrical motor
 both motors has same stability
 salient pole motor

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor will

 Decrease.d
 increase.
 none of these.
 remains same.

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Electrical Machines
Eddy current loss will depends on

All of these
 Flux density
 Thickness
 Frequency

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Electrical Machines
Which of following components of a DC generator plays vital role for providing direct electric current of a DC generator?

 Eye bolt.
 Commutator.
 Dummy coils.
 Equalizer rings.

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