MCQs of AC-DC Converters (Power Electronics - 3140915)

Power Electronics (3140915) MCQs

MCQs of AC-DC Converters

Showing 31 to 40 out of 107 Questions

31.

A single-phase full controlled converted with RLE load will act like a line-commutated inverter when the firing angle α

(a)	α > 180°
(b)	α > 90°
(c)	α < 90°
(d)	α = 90°

32.

In converter operation, with output voltage = Vo and RLE load.

(a)	Vo < E
(b)	Vo = E
(c)	Vo > E
(d)	None of the mentioned

33.

Choose the correct statement

(a)	M-2 type connection requires SCRs with higher PIV as compared to those in a B-2 type
(b)	M-2 type connection requires SCRs with lower PIV as compared to those in a B-2 type
(c)	The average output voltage in M-2 type is more than that obtained from a B-2 type configuration of the same rating
(d)	The average output voltage in M-2 type is less than that obtained from a B-2 type configuration of the same rating

34.

A single-phase full converter bridge, is connected to a RLE load. The source has a rms voltage of 230 V and the average load current is 10 A. Find the firing angle for which the power flows from AC source to the DC load. Consider E = 120 V, R = 0.4 Ω.

(a)	26.4°
(b)	53.2°
(c)	142°
(d)	39°

35.

A single-phase full converter bridge, is connected to a RLE load. The source has a rms voltage of 230 V and the average load current is 10 A. Find the firing angle for which the power flows from the DC load to the AC source. Consider E = 120 V, R = 0.4 Ω, L = 2 H.

(a)	124°
(b)	153°
(c)	142°
(d)	309°

36.

A single phase full controlled bridge converter is connected to load having R = 0.4 Ω, E = 120, L = 0.2 mH, Vs = 230V. The RMS value of load current is 10 A for a firing angle of 53.21°. Find the input power factor.

(a)	0.5043 lag
(b)	0.5391 lag
(c)	0.6120 lag
(d)	1

37.

A single phase full converter feeds power to a RLE load with R = 6 Ω and E = 60 V. Find the average value of the load current when the supply voltage is 230 V rms AC and a firing angle = 50°.

(a)	0
(b)	3.9A
(c)	12.1 A
(d)	6.05 A

38.

In case of controlled rectifiers, the nature of the load current (continues or discontinuous) depends upon the

(a)	type of load and firing angle
(b)	only on the type of load
(c)	only on the firing angle
(d)	it is independent of all the parameters

39.

A single phase full converter, feeds power to a RLE load with R = 6 Ω and E = 60 V. The supply voltage is 230 V AC and the firing angle is 50°. Find the power delivered to the battery.

(a)	542 W
(b)	100 W
(c)	960 W
(d)	730 W

40.

In a single phase semi converter with resistive load and a firing angle α, each SCR and freewheeling diode would conduct for

(a)	α, 0°
(b)	π-α, α
(c)	π+α, α
(d)	π-α, 0°

Showing 31 to 40 out of 107 Questions