Q.1
For α > 90°, 3-Φ Full wave bridge rectifier acts as a natural commutated inverter.
  • a) True
  • b) False
Q.2
What is the formula for output voltage for 3-Φ Full wave bridge rectifier for R-L load?
  • a) 3Vml(cos(∝))÷2π
  • b) 3Vml(cos(∝))÷π
  • c) 2Vml(cos(∝))÷π
  • d) 6Vml(cos(∝))÷π
Q.3
The output voltage of 3-Φ Full wave bridge rectifier is six times of 3-Φ Half-wave rectifier.
  • a) True
  • b) False
Q.4
What is the formula for output voltage for 3-Φ Full wave bridge rectifier for R load for α < 60°?
  • a) 2Vml(cos(∝))÷π
  • b) 3Vml(cos(∝))÷2π
  • c) 3Vml(cos(∝))÷π
  • d) 6Vml(cos(∝))÷π
Q.5
____________ is the boundary for C.C.M and D.C.M mode in 3-Φ Full wave bridge rectifier for R load.
  • a) 60°
  • b) 10°
  • c) 80°
  • d) 50°
Q.6
What is the formula for output voltage for 3-Φ Full wave bridge rectifier for R load for α > 60°?
  • a) 2Vml(1+cos(∝+60°))÷π
  • b) 3Vml(1+cos(60°+∝))÷2π
  • c) 3Vml(1+cos(60°+∝))÷π
  • d) 6Vml(cos(∝))÷π
Q.7
Calculate the r.m.s value of thyristor current in 3-Φ Full wave converter for the load current=4 A and α=12°.
  • a) 2.3 A
  • b) 2.5 A
  • c) 2.7 A
  • d) 2.9 A
Q.8
Calculate the average value of thyristor current in 3-Φ Full wave converter for the load current=9 A and α=26°.
  • a) 4 A
  • b) 5 A
  • c) 7 A
  • d) 3 A
Q.9
Calculate the De-rating factor if the string efficiency is%.
  • a) .84
  • b) .44
  • c) .5
  • d) .6
Q.10
Full form of MOSFET is ___________
  • a) Metal oxide silicon field effect transistor
  • b) Metal oxide semiconductor field effect transistor
  • c) Metal oxide settle field effect transistor
  • d) Metal oriented silicon field effect transistor
Q.11
Full form of FET is ___________
  • a) Field effect transistor
  • b) Field engage transistor
  • c) Field effect terminal
  • d) Fire engage transistor
Q.12
Calculate the compensator rating required for sin(Φ)=.13.
  • a) 0.45 P.U
  • b) 0.12 P.U
  • c) 0.13 P.U
  • d) 0.82 P.U
Q.13
Full form of DIAC is ___________
  • a) Digital Alternating current
  • b) Discrete Alternating current
  • c) Diode for Alternating current
  • d) Digital Alternating counter
Q.14
Which harmonic is not present in 3-Φ fully controlled rectifier?
  • a) 81st harmonic
  • b) 15th harmonic
  • c) 17th harmonic
  • d) 11th harmonic
Q.15
Fifth lowest order harmonic present in 3-Φ fully controlled rectifier is __________
  • a) 15th
  • b) 17th
  • c) 13th
  • d) 12th
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