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Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?
10 Hz.
2 Hz.
50 Hz.
3 Hz.
10 Hz.
2 Hz.
50 Hz.
3 Hz.
Answer
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Related Question
Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is
40 A.
440 A.
44 A.
400 A.
40 A.
440 A.
44 A.
400 A.
Answer
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Electrical Machines
A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is
some what more than 230 V
230 V
not possible
some what less than 230 V
some what more than 230 V
230 V
not possible
some what less than 230 V
Answer
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Electrical Machines
Ideal value of voltage regulation of a device is?
a positive finite value
a finite negative value
∞
0
a positive finite value
a finite negative value
∞
0
Answer
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Electrical Machines
If the excitation is reduced, the power factor is
None of these
lagging power factor
unity power factor
leading power factor
None of these
lagging power factor
unity power factor
leading power factor
Answer
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Electrical Machines
Cross magnetization effects which of the following?
reduction in main field flux
commutation
reduces the terminal voltage
both 2 and 3
reduction in main field flux
commutation
reduces the terminal voltage
both 2 and 3
Answer
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