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Power Electronics
Tough Power Electronics
Quiz 1
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Q.1
The below given circuit can
a) operate in all the four quadrants
b) operate in only the first and second quadrant
c) operate in only the fourth and third quadrant
d) operate in only the first and fourth quadrant
Q.2
In the below shown chopper circuit, when CH3 is on
a) both load voltage and current are zero
b) both load voltage and current are positive
c) both load voltage and current are negative
d) none of the mentioned
Q.3
In the below given type E chopper circuit, when CH3 and CH2 are switched on and then CH3 is switched off after some time, then
a) load current falls to zero
b) negative current freewheels through CH2, D4
c) positive current freewheels through CH2, D4
d) none of the mentioned
Q.4
For the type E chopper to be operated in the fourth quadrant
a) only one switch is operated
b) two switches are operated
c) three switches are operated
d) all the switches are operated
Q.5
For the fourth quadrant operation, the current flows through
a) CH1, D2, L and D1
b) CH4, D3, L and D4
c) CH4, D2, L and E
d) CH1, D2, L and D3
Q.6
When CH4 is turned on and then off
a) load current falls to zero
b) negative current freewheels through D2, D3
c) positive current freewheels through D2, D3
d) none of the mentioned
Q.7
Find the expression for the ripple factor in terms of duty cycle α for a type A step down chopper
a) √(1-α/α)
b) α2/2
c) √α/2
d) √(1-α)
Q.8
The AC ripple voltage is given by
a) Vrms/Vo
b) Vrms2/π
c) √(Vrms2 – Vo2)
d) √(Vrms + Vo)
Q.9
The expression for the thyristor (chopper switch) current is given by
a) 2Vs/π
b) 180°
c) E/2Vs
d) Vs/R
Q.10
In a type E chopper, if all the four chopper switches are closed simultaneously then
a) load is short circuited
b) supply is short circuited
c) both load and supply are shorted
d) none of the mentioned.
Q.11
A type A step down chopper has Vs =V and is connected to RLE load. With R = 1 Ω, E =V and L large enough to maintain continuous conduction. Find the average value of load current for a duty cycle of%.
a) 100 A
b) 22 A
c) 42 A
d) 16.5 A
Q.12
A step down chopper has Vs =V and is connected to RLE load. With R = 1 Ω, E =V and L = 5 mH. The chopping period isμs and the on-period isμs. Find the value of minimum steady state output current.
a) 33 A
b) 42 A
c) 0 A
d) 51 A
0 h : 0 m : 1 s
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