Power Electronics (3140915) MCQs

MCQs of DC-AC converters – Inverters

Showing 11 to 20 out of 100 Questions
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11.
Find the conduction time of the diodes if the SCRs are fired at 0 and T/2 respectively in a single phase half wave inverter with R load.
(a) 0
(b) T/2
(c) 2/T
(d) insufficient data
Answer:

Option (a)

12.
The output current wave of a single-phase full bridge inverter on RL load is
(a) a sine wave
(b) a square wave
(c) a triangular wave
(d) constant dc
Answer:

Option (c)

13.
Single-phase full bridge inverters requires
(a) 4 SCRs and 2 diodes
(b) 4 SCRs and 4 diodes
(c) 2 SCRs and 4 diodes
(d) 2 SCRs and 2 diodes
Answer:

Option (b)

14.
The output voltage from a single phase full wave bridge inverter varies from
(a) Vs to –Vs
(b) Vs to zero
(c) Vs/2 to zero
(d) –Vs/2 to Vs/2
Answer:

Option (a)

15.
In a single phase full wave bridge inverter, when the output is Vs or –Vs
(a) one SCR and one diode are conducting
(b) four SCRs are conducting
(c) two SCRs are conducting
(d) two diodes are conducting
Answer:

Option (c)

16.
For a full wave bridge inverter, the output voltage (Vo)
(a) Vo = Vs/2 for 0 < t < T/2
(b) Vo = Vs for 0 < t
(c) Vo = Vs for T/2< t < T
(d) Vo = -Vs for T/2< t < 3T/2
Answer:

Option (b)

17.
For a half wave bridge inverter, the output voltage
(a) Vo = – Vs/2 for 0 < t < T/2
(b) Vo = – Vs/2 for T/2< t
(c) Vo = – Vs for 0 < t < T/2
(d) Vo = Vs/2 for T/2< t < T
Answer:

Option (b)

18.
The fundamental component of output voltage for a half wave bridge inverter is given by
(a) (4Vs/π) sinωt
(b) (2Vs/π) sinωt
(c) (Vs/2π) sinωt
(d) (Vs)
Answer:

Option (b)

19.
The fundamental component of output voltage for a full wave bridge inverter is given by
(a) (2Vs/π) sinωt
(b) (4Vs/π) sinωt
(c) (Vs/2π) sinωt
(d) (Vs)
Answer:

Option (b)

20.
A single phase half bridge inverter has a dc voltage source Vs/2 = 115 V. Find the rms value of the fundamental component of output voltage.
(a) 510 V
(b) 103.5 V
(c) 120 V
(d) 96 V
Answer:

Option (b)

Showing 11 to 20 out of 100 Questions
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