Q.1
Name the circuit shown in the figure below.
Questionpower-electronics-questions-answers1.jpg
  • a) Single-phase circulating current type dual converter
  • b) Single-phase non-circulating current type dual converter
  • c) Three-phase circulating current type dual converter
  • d) None of the mentioned
Q.2
Dual converters handle ________ during no load.
  • a) very high temperature
  • b) no current
  • c) only circulating current
  • d) load current
Q.3
In a three phase dual converter, converter 1 is operating with α =and converter 2 is operating with α2 = 85°. Choose the correct statement.
  • a) Converter 1 is operating as a rectifier and converter 2 as an inverter
  • b) Both the converters are operating as a rectifier
  • c) Converter 1 is operating as a inverter and converter 2 as an rectifier
  • d) Both the converters are operating as an inverter
Q.4
The circuit shown below is that of a
Questionpower-electronics-questions-answers4.jpg
  • a) single-phase circulating current type dual converter
  • b) three-phase non-circulating current type dual converter
  • c) three-phase circulating current type dual converter
  • d) none of the mentioned
Q.5
In circulating current type of dual converters, the nature of voltage across the reactor is
  • a) triangular
  • b) pulsating
  • c) constant
  • d) alternating
Q.6
When a line commutated converter operates in the inverter mode then
  • a) it draws real and reactive power from the supply
  • b) it delivers both real and reactive power to the supply
  • c) it delivers real power to the supply
  • d) it delivers reactive power to the supply
Q.7
The reactor is required in a circulating current type dual converter to
  • a) improve the power factor
  • b) smooth-en the waveform of circulating current
  • c) limit the circulating current
  • d) increase the circulating current
Q.8
In the below given figure the converter 1 (to the right side) has firing angle = αconverter 2 has firing angle = αFor the dual converter to operate in the second quadrant.
Questionpower-electronics-questions-answers8.jpg
  • a) α1 > 90°
  • b) α2 > 90°
  • c) α1 < 90°
  • d) α2 < 90°
Q.9
If V1 and V2 are the converter output voltages then the reactor voltage is
  • a) V1 + V2
  • b) V1 – V2
  • c) V1 x V2
  • d) none of the mentioned
Q.10
In the below given figure, the converter 1 (to the right side) has firing angle = αconverter 2 has firing angle = αFor the dual converter to operate in the fourth quadrant.
Questionpower-electronics-questions-answers10.jpg
  • a) α1 > 90°
  • b) α2 > 90°
  • c) α1 < 90°
  • d) α2 < 90°
0 h : 0 m : 1 s