21. |
Three-phase induction motor is mainly suitable for which of the following application
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Answer:
Option (a) |
22. |
An induction motor is running at its rated torque and rated applied voltage of 440 volts. The effect of reducing the applied voltage to say 350 volts is
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Answer:
Option (d) |
23. |
If the frequency of input power to an induction motor increases, the rotor copper loss
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Answer:
Option (b) |
24. |
If the stator voltage and frequency of an induction motor are reduced proportionately, its
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Answer:
Option (d) |
25. |
The concept of V/f control of inverters driving induction motors resuls in
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Answer:
Option (a) |
26. |
Full form of VVVF control
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Answer:
Option (d) |
27. |
While operating on variable frequency supplies, the AC motor requires variable voltage in order to
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Answer:
Option (b) |
28. |
AC power in a load can be controlled by using
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Answer:
Option (c) |
29. |
The square wave operation of 3 phase VSI line contains harmonic. The amplitudes are
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Answer:
Option (a) |
30. |
Very large values of modulation index
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Answer:
Option (c) |