Power Electronics (3140915) MCQs

MCQs of DC-AC converters – Inverters

Showing 1 to 10 out of 100 Questions
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1.
Inverters converts
(a) dc power to dc power
(b) dc power to ac power
(c) ac power to ac power
(d) ac power to dc power
Answer:

Option (b)

2.
Line-commutated inverters have
(a) AC on the supply side and DC on the load side
(b) AC on both supply and load side
(c) DC on both supply and load side
(d) DC on the supply side and AC on the load side
Answer:

Option (b)

3.
In a VSI (Voltage source inverter)
(a) the internal impedance of the DC source is negligible
(b) the internal impedance of the DC source is very very high
(c) the internal impedance of the AC source is negligible
(d) the IGBTs are fired at 0 degrees.
Answer:

Option (a)

4.
A VSI is the one in which the internal impedance of the source is negligible. It has a stiff DC source at its input.
(a) load commutation
(b) line commutation
(c) applying a negative gate pulse
(d) removing the base signal
Answer:

Option (c)

5.
VSIs using IGBTs are turned off by
(a) load commutation
(b) line commutation
(c) applying a negative gate pulse
(d) removing the base signal
Answer:

Option (d)

6.
__________ based inverters do not require self-commutation.
(a) IGBT
(b) GTO
(c) PMOSFET
(d) SCR
Answer:

Option (d)

7.
Single phase half bridge inverters requires
(a) two wire ac supply
(b) two wire dc supply
(c) three wire ac supply
(d) three wire dc supply
Answer:

Option (d)

8.
In a single-phase half wave inverter ________ SCR(s) are/is gated at a time.
(a) 1
(b) 2
(c) 3
(d) none of the mentioned
Answer:

Option (a)

9.
The voltage in a single phase half wave inverter varies between
(a) Vs and 0
(b) Vs/2 and 0
(c) Vs/2 and –Vs/2
(d) Vs and –Vs
Answer:

Option (c)

10.
The output of a single-phase half bridge inverter on R load is ideally
(a) a sine wave
(b) a square wave
(c) a triangular wave
(d) constant dc
Answer:

Option (b)

Showing 1 to 10 out of 100 Questions
1 2 3 4 5 6