Power Electronics (3140915) MCQs

MCQs of DC-AC converters – Inverters

Showing 41 to 50 out of 100 Questions
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41.
The total harmonic distortion (THD) is the measure of
(a) input vs output power factor
(b) temperature sensitivity
(c) waveform distortion
(d) contribution of each harmonic to the total output
Answer:

Option (c)

42.
The distortion factor is the ratio of
(a) total rms output voltage to fundamental rms output voltage
(b) fundamental rms output voltage to fundamental average output voltage
(c) total rms output voltage to rms value of all the harmonic components
(d) fundamental rms output voltage to total rms output voltage
Answer:

Option (d)

43.
A single-phase half bridge inverter is connected to a 230 V dc source which is feeding a R load of 10 Ω. Determine the fundamental power delivered to the load.
(a) 1.07 W
(b) 107.2 W
(c) 1.07 kW
(d) 107.2 kW
Answer:

Option (c)

44.
A single-phase half bridge inverter is connected to a 230 V dc source which is feeding a R load of 10 Ω. Determine the average current through each SCR inverter switch.
(a) 11.5 A
(b) 5.75 A
(c) 23 A
(d) none of the mentioned
Answer:

Option (b)

45.
Find the distortion factor (μ), for a single phase half wave bridge inverter with dc source Vs = 1 kV.
(a) 0.87
(b) 1
(c) 0.9
(d) 0.7
Answer:

Option (c)

46.
A single phase inverter gives rms value of output voltage as 115 V and the fundamental output voltage of as 103.5 V. Find the THD (Total Harmonic Distortion).
(a) 0.4 %
(b) 40.8 %
(c) 48.3 %
(d) 4.83 %
Answer:

Option (c)

47.
A three-phase bridge inverter requires minimum of _____________ switching devices.
(a) 3
(b) 4
(c) 6
(d) 8
Answer:

Option (c)

48.
In the three-phase bridge inverter, each step consists of
(a) 30°
(b) 60°
(c) 90°
(d) will depend on the value of the firing angle
Answer:

Option (b)

49.
In inverters, to make the supply voltage constant
(a) an inductor is placed in series with the load
(b) capacitor is connected in parallel to the load side
(c) capacitor is connected in parallel to the supply side
(d) none of the mentioned
Answer:

Option (c)

50.
In the 180° mode VSI, ___________ devices conduct at a time.
(a) 5
(b) 2
(c) 3
(d) 4
Answer:

Option (c)

Showing 41 to 50 out of 100 Questions
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