Q.1
In the figure shown below, the capacitor C is used to
Questionpower-electronics-questions-answers1.jpg
  • a) maintain the load voltage constant
  • b) protect the load
  • c) protect the chopper switch (SW)
  • d) maintain the load current constant
Q.2
In the below shown step-up/step-down chopper circuit, when the switch (SW) is on
  • a) current through inductor rises and the load voltage is zero
  • b) current through inductor rises and the load voltage is Vs
  • c) current through inductor decays and the load voltage is zero
  • d) current through inductor decays and the load voltage is Vs
Q.3
For a step-up/step-down chopper, if α (duty cycle) < 0.5 then
  • a) Vo = Vs
  • b) Vo < Vs
  • c) Vo > Vs
  • d) none of the mentioned
Q.4
In the below shown step-up/step-down chopper circuit, when the chopper switch (SW) if first on and then off, then the current flows from path
  • a) Vs-CH-L-Vs
  • b) L-Load-D-L
  • c) L-D-Load-L
  • d) no current flows
Q.5
For a step-up/step-down chopper, if current increases from I1 to I2 linearly during Ton, then find the energy stored in the inductor during Ton
  • a) zero
  • b) Vs x (I1 + I2)
  • c) Vs x [ (I1 + I2)/2 ] x Ton
  • d) Vs x [ (I1 + I2)/2 ] x T
Q.6
A step-down chopper is also called as a
  • a) first-quadrant chopper
  • b) second-quadrant chopper
  • c) third-quadrant chopper
  • d) fourth-quadrant chopper
Q.7
For the type-B chopper shown below
Questionpower-electronics-questions-answers7.jpg
  • a) during Ton, Vo = 0 and L stores energy
  • b) during Ton, Vo is not 0 and L stores energy
  • c) during Ton, Vo = 0 and L releases energy
  • d) during Ton, Vo is not 0 and L releases energy
Q.8
For the type-B chopper shown below
Questionpower-electronics-questions-answers8.jpg
  • a) during Toff, Vo = (E + Ldi/dt) and D is conducting
  • b) during Toff, Vo = (E + Ldi/dt) and D is not-conducting
  • c) during Toff, Vo = 0
  • d) during Toff, Vo = Vs
Q.9
The below given chopper is that of a
Questionpower-electronics-questions-answers9.jpg
  • a) step-up chopper
  • b) step-down chopper
  • c) step-up/step-down chopper
  • d) depends on the duty cycle
Q.10
The type-C chopper or two quadrant type-A chopper has
  • a) type-A and type-B choppers in series
  • b) type-A and type-B choppers in parallel
  • c) two type-A choppers in series
  • d) two type-A choppers in parallel
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