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Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is
50 Hz
25 Hz
40 HZ
60 Hz
50 Hz
25 Hz
40 HZ
60 Hz
Answer
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Related Question
Electrical Machines
The results of a slip test for determining direct axis (Xd) and quadrature axis (Xq) reactances of a star connected salient pole alternator are given below Phase values: Vmax = 108 V ; Vmin = 96 V Imax = 12 A ; Imin = 10 A Hence the two reactances will be
Xd = 8Ω and Xq = 10.8Ω
Xd = 9Ω and Xq = 9.6Ω
Xd = 10.8Ω and Xq = 8Ω
Xd = 9.6Ω and Xq = 9Ω
Xd = 8Ω and Xq = 10.8Ω
Xd = 9Ω and Xq = 9.6Ω
Xd = 10.8Ω and Xq = 8Ω
Xd = 9.6Ω and Xq = 9Ω
Answer
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Electrical Machines
As compared to an induction motor, the air gap in a DC motor is
between 50% and 90%.
more.
same.
less than 50%.
between 50% and 90%.
more.
same.
less than 50%.
Answer
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Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is
200 V
230 V
115 V
460 V
200 V
230 V
115 V
460 V
Answer
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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.
440 volt.
240 volt.
220 volt.
230 volt.
440 volt.
240 volt.
220 volt.
Answer
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Electrical Machines
Which of the following generators are used in arc welding?
differential compound generators
series generators
cumulative compound generators
shunt generators
differential compound generators
series generators
cumulative compound generators
shunt generators
Answer
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