Electric Drives Questions and Answers – Solid-State Switching Circuits – DC/AC Conversion

This set of Electric Drives Multiple Choice Questions & Answers (MCQs) focuses on “Solid-State Switching Circuits – DC/AC Conversion”.

1. Inverters are used to convert DC power into variable AC power.
a) True
b) False
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2. Short circuit problem is severe in case of Voltage source inverter.
a) True
b) False
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3. Switches used in VSI are ___________
a) Unipolar & Unidirectional
b) Bipolar & Bidirectional
c) Unipolar & Bidirectional
d) Unidirectional
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4. Switches used in CSI are ____________
a) Bipolar & Unidirectional
b) Bipolar & Bidirectional
c) Unipolar & Unidirectional
d) Bidirectional
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5. Full form of VSI is ___________
a) Voltage source inverter
b) Volume source inverter
c) Voltage severe inverter
d) Voltage source inserter
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6. Full form of CSI is ___________
a) Counter source inverter
b) Counter severe inverter
c) Current source inverter
d) Current severe inverter
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7. Number of switches turned on in 3-phase 180° VSI at a single time are __________
a) 3
b) 2
c) 1
d) 4
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8. Number of switches turned on in 3-phase 120° VSI at a single time are __________
a) 2
b) 4
c) 5
d) 3
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9. Calculate the phase voltage for 3-∅ 180° VSI if the value of DC supply is 20 V.
a) 9.40 V
b) 9.42 V
c) 9.18 V
d) 9.78 V
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10. Calculate the line voltage for 3-∅ 180° VSI if the value of DC supply is 22 V.
a) 18.52 V
b) 18.12 V
c) 17.96 V
d) 15.48 V
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11. Calculate the line voltage for 3-∅ 120° VSI if the value of DC supply is 24 V.
a) 16.52 V
b) 16.97 V
c) 12.96 V
d) 12.48 V
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12. Calculate the phase voltage for 3-∅ 120° VSI if the value of DC supply is 26 V.
a) 10.52 V
b) 10.97 V
c) 10.96 V
d) 10.61 V
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13. Calculate power absorbed by 5 Ω load in 3-∅ 120° VSI if the value of DC supply is 16 V.
a) 17.06 W
b) 15.15 W
c) 18.25 W
d) 19.26 W
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14. Calculate power absorbed by 10 Ω load in 3-∅ 180° VSI if the value of DC supply is 36 V.
a) 20.6 W
b) 24.5 W
c) 26.4 W
d) 28.8 W
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15. T.H.D value for 3-∅ 180° VSI is ________________
a) 36 %
b) 31 %
c) 39 %
d) 46 %
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Sanfoundry Global Education & Learning Series – Electric Drives.

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