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. What is the operating frequency, 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. What is the operating frequency, if the load is 600 MW?

48 Hz

50 Hz

45 HZ

48.5 Hz

48 Hz

50 Hz

45 HZ

48.5 Hz

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

10 volts.

40 volts.

30 volts.

20 volts.

10 volts.

40 volts.

30 volts.

20 volts.

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Electrical Machines
If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will (assuming that the magnetic circuit remains unsaturated)

changes to 1.5 times the original value

remain the same as the original

changes to 0.5 times the original value

changes to three times the original value

changes to 1.5 times the original value

remain the same as the original

changes to 0.5 times the original value

changes to three times the original value

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Electrical Machines
An unexcited single phase synchronous motor is

universal motor.

reluctance motor.

AC series motor.

repulsion motor.

universal motor.

reluctance motor.

AC series motor.

repulsion motor.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. Highest speed of alternator is

500 rpm.

3000 rpm.

3600 rpm.

600 rpm.

500 rpm.

3000 rpm.

3600 rpm.

600 rpm.

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Electrical Machines
In a synchronous generator, if mechanical input is increased with constant excitation, the load angle will

either increase or decrease

decrease

None of these

increase

either increase or decrease

decrease

None of these

increase

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Electrical Machines

Electrical Machines What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

Electrical Machines If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will (assuming that the magnetic circuit remains unsaturated)

Electrical Machines An unexcited single phase synchronous motor is

Electrical Machines Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. Highest speed of alternator is

Electrical Machines In a synchronous generator, if mechanical input is increased with constant excitation, the load angle will

Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

Electrical Machines
If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will (assuming that the magnetic circuit remains unsaturated)

Electrical Machines
An unexcited single phase synchronous motor is

Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. Highest speed of alternator is

Electrical Machines
In a synchronous generator, if mechanical input is increased with constant excitation, the load angle will