Power Electronics (3140915) MCQs

MCQs of DC-AC converters – Inverters

Showing 21 to 30 out of 100 Questions
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21.
A single phase half bridge inverter has load R = 2 Ω and a dc voltage source Vs/2 = 115 V. Find the rms value of the fundamental load current.
(a) 10.25 A
(b) 51.7 A
(c) 86 A
(d) 24.8 A
Answer:

Option (b)

22.
A single phase half bridge inverter has load R = 2 Ω and a dc voltage source Vs/2 = 115 V. Find the power delivered to the load due to the fundamental component.
(a) 536 kW
(b) 53.61 kW
(c) 5.361 kW
(d) 536 W
Answer:

Option (c)

23.
A single phase full bridge inverter has a dc voltage source Vs = 230 V. Find the rms value of the fundamental component of output voltage.
(a) 90 V
(b) 207 V
(c) 350 V
(d) 196 V
Answer:

Option (b)

24.
A single phase full bridge inverter has load R = 2 Ω, and dc voltage source Vs = 230 V. Find the rms value of the fundamental load current.
(a) 96 A
(b) 0 A
(c) 103 A
(d) none of the mentioned
Answer:

Option (c)

25.
A certain full bridge type inverter circuit has its rms value of fundamental load current component given by W. The fundamental frequency component of the load current would be given by
(a) W sin ωt
(b) (W/√2) sin ωt
(c) √2 W sin ωt
(d) sin ωt
Answer:

Option (c)

26.
In a half wave bridge inverter circuit, the power delivered to the load by each source is given by
(a) Vs x Is
(b) (Vs x Is)/2
(c) 2(Vs x Is)
(d) None of the mentioned
Answer:

Option (b)

27.
In a half wave circuit, forced commutation is essential when the
(a) load is inductive
(b) load is resistive
(c) source voltage is below 150 V
(d) none of the mentioned
Answer:

Option (b)

28.
A single phase full bridge inverter circuit, has load R = 2 Ω and dc source Vs = 230 V. Find the value of power delivered to the load in watts only due to the fundamental component of the load current.
(a) 5361.5 W
(b) 2142.5 W
(c) 21424.5 W
(d) 214.2 W
Answer:

Option (c)

29.
A single phase full bridge inverter is fed from a dc source such that the fundamental component of output voltage = 230 V. Find the rms value of SCR and diode current respectively, for a R load of 2 &)mega;.
(a) 115 A, 80 A
(b) 81.33 A, 36.2 A
(c) 36.2 A, 0 A
(d) 81.33 A, 0 A
Answer:

Option (d)

30.
For a full bridge inverter with the following load: R = 2 Ω, XL = 8 Ω and XC = 6 Ω.
(a) The output voltage lags the current by 45°
(b) The output current lags the voltage by 45°
(c) The output current lags the voltage by 90°
(d) The output current lags the voltage by more than 90°
Answer:

Option (b)

Showing 21 to 30 out of 100 Questions
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