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Electrical Machines

Electrical Machines
Diverters are used only in

 shunt motors
 series motors
 either of these
None of these

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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.

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Electrical Machines
The condition for maximum running torque is

 0.707 lagging
 R = S.X
 unity
 zero
 0.5 lagging

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.02, 0.98
 0.02, 1.98
 0.04, 0.96
 0.04, 1.96

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor is clockwise when it is supplied with 3 - Φ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be

 B - C - A or C - A - B.
 C - A - B.
 B - C - A.
  A - C - B.

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Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

 T∝ P
 T is independent of P
 T∝ P²
 T∝ P³

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