Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are 4% and 5% from no load to full load. Consider the governors operating at 50Hz on no load. How will the machine share, if the load is 600 MW?

Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are 4% and 5% from no load to full load. Consider the governors operating at 50Hz on no load. How will the machine share, if the load is 600 MW?

generator 1 gets over load

generator 2 gets over load

200 MW and 400MW

None of these

generator 1 gets over load

generator 2 gets over load

200 MW and 400MW

None of these

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Electrical Machines
Hunting in a synchronous motor takes place

when supply voltage fluctuates.

when power factor is unity.

when load varies.

motor is under loaded.

when supply voltage fluctuates.

when power factor is unity.

when load varies.

motor is under loaded.

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Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

T ∝ 1/V²

T ∝ 1/V

T∝ V²

T ∝ V

T ∝ 1/V²

T ∝ 1/V

T∝ V²

T ∝ V

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Electrical Machines
How can the synchronous speed of a 3 - ÃŽÂ¦ IM be varied?

By varying number of poles.

Both (A) and (B).

By varying the supply frequency.

By varying supply voltage.

By varying number of poles.

Both (A) and (B).

By varying the supply frequency.

By varying supply voltage.

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

synchronizing power co efficient.

restoring torque.

mechanical rotatory system.

damping torque.

synchronizing power co efficient.

restoring torque.

mechanical rotatory system.

damping torque.

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Electrical Machines
Which of the following factors improve commutation in a dc machine ? 1. High contact resistance of brushes 2. High inductance of the coils undergoing commutation 3. Shifting of brushes in the direction of rotation for a generator and in the opposite direction For a motor 4. Narrow width for the commutation bars Select the correct answer using the codes given below : Codes :

1 and 3

1, 2, and 3

1, 2 and 4

2, 3 and 4

1 and 3

1, 2, and 3

1, 2 and 4

2, 3 and 4

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Electrical Machines

Electrical Machines Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are 4% and 5% from no load to full load. Consider the governors operating at 50Hz on no load. How will the machine share, if the load is 600 MW?

Electrical Machines Hunting in a synchronous motor takes place

Electrical Machines In a 3-phase induction motor, torque and supply voltage are related as

Electrical Machines How can the synchronous speed of a 3 - ÃŽÂ¦ IM be varied?

Electrical Machines In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are 4% and 5% from no load to full load. Consider the governors operating at 50Hz on no load. How will the machine share, if the load is 600 MW?

Electrical Machines
Hunting in a synchronous motor takes place

Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

Electrical Machines
How can the synchronous speed of a 3 - ÃŽÂ¦ IM be varied?

Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.