Electric Drives Questions and Answers – Solid-State Switching Circuits – Three Phase, Half-Wave, AC/DC Conversion for Resistive Loads

This set of Electric Drives Multiple Choice Questions & Answers (MCQs) focuses on “Solid-State Switching Circuits – Three Phase, Half-Wave, AC/DC Conversion for Resistive Loads”.

1. Calculate the V_o(avg) for the 3-Φ phase Half-wave uncontrolled rectifier if the supply value is 440 V.
a) 297.25 V
b) 298.15 V
c) 298.11 V
d) 300.15 V
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2. Calculate the pulse number if the supply frequency is 2π and the output frequency is 2π÷3.
a) 4
b) 5
c) 6
d) 3
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3. Calculate the average value of current for the 3-Φ phase Half-wave uncontrolled rectifier if the supply value is 400 V and resistive load value is 5 Ω.
a) 54.04 A
b) 57.26 A
c) 51.64 A
d) 58.15 A
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4. In 3-Φ Fully controlled rectifier calculate the average value of the voltage if the supply is 400 V and firing angle is 45°.
a) 381.15 V
b) 382.16 V
c) 383.19 V
d) 384.25 V
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5. Calculate the V_o(r.m.s) (Highly inductive load) for the 3-Φ phase Half-wave uncontrolled rectifier if the supply value is 441 V.
a) 297.25 V
b) 298.15 V
c) 298.11 V
d) 300.15 V
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6. Calculate the V_o(avg) for the 3-Φ phase Half-wave controlled rectifier if the supply value is 364 V and the value of firing angle is 2°.
a) 247.62 V
b) 245.76 V
c) 214.26 V
d) 233.26 V
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7. Calculate the value of the Input power factor for 3-Φ Fully controlled rectifier if the firing angle value is 16°.
a) .96
b) .91
c) .93
d) .94
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8. In 3-Φ Semi-controlled rectifier calculate the average value of the voltage if the supply is 299 V and firing angle is 56.15°.
a) 311.26 V
b) 304.26 V
c) 314.51 V
d) 312.45 V
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9. Calculate the circuit turn-off time for 3-Φ Fully controlled rectifier if the firing angle is 13° and supply frequency is 49.5 Hz.
a) 730.2 msec
b) 740.8 msec
c) 754.5 msec
d) 755.1 msec
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10. Calculate the circuit turn-off time for 3-Φ Fully controlled rectifier if the firing angle is 170° and supply frequency is 50.5 Hz.
a) 32.4 msec
b) 35.2 msec
c) 39.3 msec
d) 31.5 msec
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11. Calculate the form factor if V_(r.m.s)=45 V, V_(avg)=15 V.
a) 2
b) 5
c) 3
d) 8
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12. Calculate the V_o(avg) for the 3-Φ phase Half-wave controlled rectifier if the supply value is 480 V and the value of firing angle is 92°.
a) 264.02 V
b) 487.26 V
c) 858.26 V
d) 248.25 V
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13. Full form of SCR is ____________
a) Silicon controlled rectifier
b) State-controlled rectifier
c) State cover rectifier
d) State-controlled reset
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14. Full form of TRIAC is __________
a) Triode for Alternating current
b) Tri for Alternating current
c) Triode for Alternating counter
d) Tri for Alternating counters
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15. TRIAC is a unipolar switch.
a) True
b) False
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Sanfoundry Global Education & Learning Series – Electric Drives.

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