1) In a 3 phase CSI, if the required line output voltages are balanced and 120 degree out of phase, then the chopping angles are used to eliminate only the harmonics at frequencies
a. 5
b. 7
c. 11
d. All of these
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Answer
Explanation
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ANSWER: All of these
Explanation:
No explanation is available for this question!
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2) For similar carrier and modulating signals, the line current used in CSI is
a. Identical to line voltage in a VSI
b. Identical to line current in VSI
c. Identical to phase voltage in VSI
d. Identical to phase voltage in CSI
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Answer
Explanation
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ANSWER: Identical to line voltage in a VSI
Explanation:
No explanation is available for this question!
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3) Under harmonic free load voltages, the 3 phase VSI
a. Does not contains second harmonic
b. Does not contains third harmonic
c. Does not contains fifth harmonic
d. Does not contains seventh harmonic
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Answer
Explanation
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ANSWER: Does not contains second harmonic
Explanation:
No explanation is available for this question!
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4) The square wave operation of 3 phase VSI lines contains the harmonics. The amplitudes are
a. Directly proportional to their harmonic order
b. Inversely proportional to their harmonic order
c. Not related to their harmonic order
d. None of these
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Answer
Explanation
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ANSWER: Inversely proportional to their harmonic order
Explanation:
No explanation is available for this question!
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5) In a square - wave operation of 3 phase CSIs, the power values are on for
a. 60 degree
b. 90 degree
c. 120 degree
d. 150 degree
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Answer
Explanation
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ANSWER: 120 degree
Explanation:
No explanation is available for this question!
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6) A carrier based PWM technique in CSI is composed of
a. A switching pulse generator and a shorting pulse generator
b. A shorting pulse distributor
c. A switching and shorting pulse combination
d. All of these
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Answer
Explanation
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ANSWER: All of these
Explanation:
No explanation is available for this question!
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7) In square wave operation mode of 3 phase VSI, the VSI
a. Can control the load voltage
b. Cannot control the load voltage
c. Cannot control the load voltage except by means of dc link voltage
d. Cannot control the load voltage except by means of dc link current
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Answer
Explanation
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ANSWER: Cannot control the load voltage except by means of dc link voltage
Explanation:
No explanation is available for this question!
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8) In a 3 phase VSI SPWM to use a single carrier signal and preserve the features of PWM technique, the normalized carrier frequency should be
a. Multiple of two
b. Odd multiple of three
c. Odd multiple of five
d. Odd multiple of seven
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Answer
Explanation
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ANSWER: Odd multiple of three
Explanation:
No explanation is available for this question!
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9) In a three phase voltage source inverters
a. Only amplitude of voltage is controllable
b. Only phase is controllable
c. Both amplitude and phase is controllable
d. Amplitude, phase and frequency of voltages should always be controllable
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Answer
Explanation
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ANSWER: Amplitude, phase and frequency of voltages should always be controllable
Explanation:
No explanation is available for this question!
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