Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% 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 identical as 4% 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?

200 MW and 400MW respectively

230.7 MW and 369.23 MW respectively

generator 1 gets over load

generator 2 gets over load

200 MW and 400MW respectively

230.7 MW and 369.23 MW respectively

generator 1 gets over load

generator 2 gets over load

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Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

0.96

0.87

1.06

0.95

0.96

0.87

1.06

0.95

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Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

increased by 20%

reduced by 10%

increased by 10%

reduced by 20%

increased by 20%

reduced by 10%

increased by 10%

reduced by 20%

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Electrical Machines
The result of slip test on a 3-phase, 20 KVA, 400 V, 50 Hz connected salient pole alternator is given below- Phase value: Vmax = 100 V, Vmin = 96 V, Imax = 10 A and I min = 7 A. The direct and quadranature axis reactances are respectively

14.28 and 5.54 ÃŽÂ©.

14.28 and 9.60 ÃŽÂ©.

8.248 and 9.60 ÃŽÂ©.

8.248 and 5.54 ÃŽÂ©.

14.28 and 5.54 ÃŽÂ©.

14.28 and 9.60 ÃŽÂ©.

8.248 and 9.60 ÃŽÂ©.

8.248 and 5.54 ÃŽÂ©.

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor will

Decrease.d

none of these.

remains same.

increase.

Decrease.d

none of these.

remains same.

increase.

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Electrical Machines
Which of the following is/are the advantages of carbon brush over the copper brush?

In case of any sparking they will be less damaged than copper brushes

All of these

They are not hard as copper brush

They are self lubricating in nature

In case of any sparking they will be less damaged than copper brushes

All of these

They are not hard as copper brush

They are self lubricating in nature

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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 identical as 4% 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 A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

Electrical Machines To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

Electrical Machines The result of slip test on a 3-phase, 20 KVA, 400 V, 50 Hz connected salient pole alternator is given below- Phase value: Vmax = 100 V, Vmin = 96 V, Imax = 10 A and I min = 7 A. The direct and quadranature axis reactances are respectively

Electrical Machines Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor will

Electrical Machines Which of the following is/are the advantages of carbon brush over the copper brush?

Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% 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
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

Electrical Machines
The result of slip test on a 3-phase, 20 KVA, 400 V, 50 Hz connected salient pole alternator is given below- Phase value: Vmax = 100 V, Vmin = 96 V, Imax = 10 A and I min = 7 A. The direct and quadranature axis reactances are respectively

Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor will

Electrical Machines
Which of the following is/are the advantages of carbon brush over the copper brush?