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Electrical Machines
Which of the following motor is used in grinders?
Capacitor start capacitor run IM.
Synchronous motor.
Split phase IM.
Capacitor start IM.
Capacitor start capacitor run IM.
Synchronous motor.
Split phase IM.
Capacitor start IM.
Answer
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Related Question
Electrical Machines
When a synchronous motor is running at synchronous speed, the damper winding produces
eddy current torque.
damping torqe.
no torque.
both 1 and 2.
eddy current torque.
damping torqe.
no torque.
both 1 and 2.
Answer
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Electrical Machines
A dc motor with armature resistance of 0.5 ohms connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is
570 A.
340 A.
250 A.
460 A.
570 A.
340 A.
250 A.
460 A.
Answer
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Electrical Machines
Interpoles in a DC motor must be
Series excited and should have the same polarity as that of the ahead main pole in the direction of rotation of armature.
Shunt excited and should have the same polarity as that of the ahead main pole in the direction of rotation of armature.
Shunt excited and should have the same polarity as that of the behind main pole in the direction of rotation of armature.
Series excited and should have the same polarity as that of the behind main pole in the direction of rotation of armature.
Series excited and should have the same polarity as that of the ahead main pole in the direction of rotation of armature.
Shunt excited and should have the same polarity as that of the ahead main pole in the direction of rotation of armature.
Shunt excited and should have the same polarity as that of the behind main pole in the direction of rotation of armature.
Series excited and should have the same polarity as that of the behind main pole in the direction of rotation of armature.
Answer
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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?
1960 Watt.
1920 Watt.
1800 Watt.
980 Watt.
1960 Watt.
1920 Watt.
1800 Watt.
980 Watt.
Answer
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Electrical Machines
The inertia constant H of a synchronous condenser is
greater than that of hydro generator.
greater than that of turbo alternator.
equal to that of the effective length of the line.
none of these.
greater than that of hydro generator.
greater than that of turbo alternator.
equal to that of the effective length of the line.
none of these.
Answer
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