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If the prime mover of an alternator supplying load to an infinite bus is suddenly shut down, it will
- a)stop
- b)continue to run as an alternator
- c)continue to run as synchronous motor running in the reverse direction
- d)continue to run as a synchronous motor running in the same direction
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
If the prime mover of an alternator supplying load to an infinite bus...
Explanation:
When the prime mover of an alternator supplying load to an infinite bus is suddenly shut down, the alternator will continue to run as a synchronous motor running in the same direction. This can be explained as follows:
1. Synchronous Motor Operation: An alternator can operate as a synchronous motor if it is connected to an AC power source and the rotor is excited with DC power. The motor will rotate at the synchronous speed, which is determined by the frequency of the AC power source and the number of poles of the machine.
2. Infinite Bus: An infinite bus is an idealized power system that is assumed to have an infinite capacity to supply or absorb power. In other words, the voltage and frequency of the infinite bus remain constant, regardless of the amount of power drawn from or supplied to it.
3. Shutdown of Prime Mover: If the prime mover of an alternator supplying load to an infinite bus is suddenly shut down, the rotor of the alternator will still be excited with DC power. As a result, the alternator will continue to run as a synchronous motor, but its speed will gradually decrease due to the mechanical losses and the power drawn by the load.
4. Synchronous Motor in the Same Direction: Since the alternator was running in the same direction as the prime mover, it will continue to run in the same direction as a synchronous motor. This is because the direction of rotation of a synchronous machine is determined by the direction of the DC excitation current in the rotor.
Conclusion:
In summary, when the prime mover of an alternator supplying load to an infinite bus is suddenly shut down, the alternator will continue to run as a synchronous motor running in the same direction. This is because the rotor is still excited with DC power and the infinite bus maintains a constant voltage and frequency.
When the prime mover of an alternator supplying load to an infinite bus is suddenly shut down, the alternator will continue to run as a synchronous motor running in the same direction. This can be explained as follows:
1. Synchronous Motor Operation: An alternator can operate as a synchronous motor if it is connected to an AC power source and the rotor is excited with DC power. The motor will rotate at the synchronous speed, which is determined by the frequency of the AC power source and the number of poles of the machine.
2. Infinite Bus: An infinite bus is an idealized power system that is assumed to have an infinite capacity to supply or absorb power. In other words, the voltage and frequency of the infinite bus remain constant, regardless of the amount of power drawn from or supplied to it.
3. Shutdown of Prime Mover: If the prime mover of an alternator supplying load to an infinite bus is suddenly shut down, the rotor of the alternator will still be excited with DC power. As a result, the alternator will continue to run as a synchronous motor, but its speed will gradually decrease due to the mechanical losses and the power drawn by the load.
4. Synchronous Motor in the Same Direction: Since the alternator was running in the same direction as the prime mover, it will continue to run in the same direction as a synchronous motor. This is because the direction of rotation of a synchronous machine is determined by the direction of the DC excitation current in the rotor.
Conclusion:
In summary, when the prime mover of an alternator supplying load to an infinite bus is suddenly shut down, the alternator will continue to run as a synchronous motor running in the same direction. This is because the rotor is still excited with DC power and the infinite bus maintains a constant voltage and frequency.
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Community Answer
If the prime mover of an alternator supplying load to an infinite bus...
On many different pieces of machinery or vehicles, there is a generator. The object that turns the generator is called the prime mover. There also may be an alternator. A generator takes the mechanical energy from turning or something and then converts it into the electricity that is needed to make the machine function. The alternator may be used to use a different or alternate electrical current.
Sometimes, the generator and alternator are used to describe the same part on the machine. These words may be used interchangeably. Sometimes, the alternator or generator shuts down while the vehicle is still in motion. If the prime mover of an alternator in which it is supplying a load does shut down, it will continue to run as a synchronous motor in the same direction.
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If the prime mover of an alternator supplying load to an infinite bus is suddenly shut down, it willa)stopb)continue to run as an alternatorc)continue to run as synchronous motor running in the reverse directiond)continue to run as a synchronous motor running in the same directionCorrect answer is option 'D'. Can you explain this answer?
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