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Power Electronics

Power Electronics
Question:-
Option (A)
3/2
Option (B)
2/3
Option (C)
5/2
Option (D)
15/2
Correct Option:
B
Question Solution:
Boost regulator is a step-up chopper
V0 = Vs/(1-α)
=> 1 – α = 5/15
=> α=2/3
Question:-
Option (A)
6 μs
Option (B)
4 μs
Option (C)
2 μs
Option (D)
1 μs
Correct Option:
B
Question Solution:
E = L . di/dt
Hence T = i.t/E = 4×10-3×0.1/100 = 4 μs
Question:-
Option (A)
1-Φ diode rectifier with dc inductive filter
Option (B)
3-Φ diode rectifier with dc inductive filter
Option (C)
3-Φ thyristor rectifier with inductive filter
Option (D)
1-Φ diode rectifier with capacitive filter
Correct Option:
D
Question Solution:
AC input current waveform is not smooth in 1- diode rectifier with capacitive filter. Presence of an inductor makes the current waveform smoother.