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Electrical Machines
Which of the following motor is more expensive for same KW output rating ?
DC Shunt Motor
Synchronous motor.
AC single phase motor.
Induction motor.
DC Shunt Motor
Synchronous motor.
AC single phase motor.
Induction motor.
Answer
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Related Question
Electrical Machines
The direction of rotation of a 3 - Φ induction motor can be reversed by
disconnecting any one phase.
transposing all the three leads from the supply.
transposing any two leads from supply.
transposing any two leads from slip rings.
disconnecting any one phase.
transposing all the three leads from the supply.
transposing any two leads from supply.
transposing any two leads from slip rings.
Answer
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Electrical Machines
Lap winding is prefered for which type of machines?
low current and low voltage
high current and low voltage
low current and high voltage
high current and high voltage
low current and low voltage
high current and low voltage
low current and high voltage
high current and high voltage
Answer
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Electrical Machines
The 3 - Φ induction motor with rotor circuit open will
run normally.
get over heated.
not run.
make noise.
run normally.
get over heated.
not run.
make noise.
Answer
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Electrical Machines
A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is
400W
300 W
500 W
250 W
400W
300 W
500 W
250 W
Answer
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Electrical Machines
What is the effect of armature reaction ?
Both option B and C.
None of the options.
Armature flux weakens the main field flux.
Armature flux distorts the main field flux.
Both option B and C.
None of the options.
Armature flux weakens the main field flux.
Armature flux distorts the main field flux.
Answer
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