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Power Electronics
Tricky Power Electronics
Quiz 1
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Q.1
In the figure shown below, the capacitor C is used to
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
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
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
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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