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Electrical Machines
An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50Hz, the emf in the rotor will have a frequency of
51.5Hz
48.5Hz
2.5Hz
1.5Hz
51.5Hz
48.5Hz
2.5Hz
1.5Hz
Answer
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Related Question
Electrical Machines
A DC Shunt Motor having shunt field resistance of 250 Ω and armature resistance of 0.5 Ω is connected to 250 V supply and load current of 21 A. What is the back emf generated ?
240 V.
150 V.
210 V
230 V.
240 V.
150 V.
210 V
230 V.
Answer
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Electrical Machines
The inertia constant H of a synchronous condenser is
greater than that of hydro generator.
equal to that of the effective length of the line.
none of these.
greater than that of turbo alternator.
greater than that of hydro generator.
equal to that of the effective length of the line.
none of these.
greater than that of turbo alternator.
Answer
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Electrical Machines
Which of the following machine is invariably provided with forced ventilation?
50 MW generator in a power plant.
Fractional horse power high speed motor.
Fractional horse power slow speed motor.
Hermetically sealed motor of refrigerator.
50 MW generator in a power plant.
Fractional horse power high speed motor.
Fractional horse power slow speed motor.
Hermetically sealed motor of refrigerator.
Answer
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Electrical Machines
Which of the following DC Motor is used in paper machines?
DC compound motor.
DC series motor.
DC Shunt motor.
Separately excited DC motor.
DC compound motor.
DC series motor.
DC Shunt motor.
Separately excited DC motor.
Answer
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Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.
220 V.
222 V.
225 V.
230 V.
220 V.
222 V.
225 V.
230 V.
Answer
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