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

Electrical Machines
The direction of rotation of a 3 - ÃŽÂ¦ induction motor is clockwise when it is supplied with 3 - ÃŽÂ¦ 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.

A - C - B.

B - C - A.

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

C - A - B.

A - C - B.

B - C - A.

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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

1.5Hz

51.5Hz

2.5Hz

48.5Hz

1.5Hz

51.5Hz

2.5Hz

48.5Hz

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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

T2 ∝ P3.

T ∝ P.

T ∝ √P.

T is independent of P.

T2 ∝ P3.

T ∝ P.

T ∝ √P.

T is independent of P.

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Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is

0.01 pu.

0.08 pu.

0.02 pu.

0.16 pu.

0.01 pu.

0.08 pu.

0.02 pu.

0.16 pu.

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Electrical Machines
Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :

1 and 2

1, 2 and 3

2 and 3

1 and 3

1 and 2

1, 2 and 3

2 and 3

1 and 3

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Electrical Machines
In a DC machine, for the same value of Ãâ€ , Z and N; which one of the following statements is correct?

Armature emf is more with wave winding than with lap winding.

Armature emf is less with wave winding than with lap winding.

Armature emf is same as long as the flux density in the air gap remains the same.

Armature emf depends on weather the machine is running as a motor or generator.

Armature emf is more with wave winding than with lap winding.

Armature emf is less with wave winding than with lap winding.

Armature emf is same as long as the flux density in the air gap remains the same.

Armature emf depends on weather the machine is running as a motor or generator.

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Electrical Machines

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

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

Electrical Machines Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

Electrical Machines In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is

Electrical Machines In a DC machine, for the same value of Ãâ€ , Z and N; which one of the following statements is correct?

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

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

Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is

Electrical Machines
In a DC machine, for the same value of Ãâ€ , Z and N; which one of the following statements is correct?