WorksheetsPower Electronics - 2
Total questions: 10
Worksheet time: 6mins
A single-phase full-bridge diode rectifier feeds a resistive load of 50 Ω from a 200V,
50Hz single-phase AC supply. If the diodes are ideal, then the active power drawn by the
load is ………... (round of nearest integer)
200
1600
500
800
RC-IGCTs are known as
Symmetrical IGTCs can be fabricated with reverse conducting
diode in the same package.
Symmetrical IGCTs can be fabricated with reverse conducting SCR in the same
package.
Asymmetrical IGCTs can be fabricated with high leakage inductance in the same
package.
Asymmetrical IGCTs can be fabricated with reverse conducting diode in the
same package
dv/dt protection is provided to the SCR by
dv/dt protection is provided to the SCR by
connecting an inductor in series with the load
connecting a capacitor & resister in parallel with the device
connecting an inductor & resister in parallel with the device
An SCR has a half-cycle surge current rating of 3000 A for 50 Hz. Calculate its
one-cycle surge current rating
3121.32 A
2121.32 A
3131.32 A
2131.32 A
Choose the correct statement
MOSFET has a positive temperature co-efficient
MOSFET has a high gate circuit impedance
MOSFET is a voltage controlled device
All of the mentioned
A single-pulse transformer with secondary voltage of 230 V, 50 Hz, delivers power
to bulb of R = 10 Ω through a half-wave- controlled rectifier circuit. For α = 60°
and output AC power of 2127 Watts, find the rectification efficiency
98.6 %
42 %
28 %
19 %
A single-phase full converter bridge is connected to the RLE load. The source
voltage is 230 V, 50 Hz. The average load current of 10 A is continuous over the
working range. For R=0.4 ohm and L = 2mH, find the firing angle delay (in
degree) for E=120 V
32.12°
43.51°
53.21°
71.21°
A single phase fully controlled bridge rectifier is operated from 240 V, 50 Hz ac mains
with firing angle 30°. Load draws a continuous and ripple free current of 12 A. Then
which of the following is correct
Average output voltage is 187.12 V
Rms value of source current is 6 A
Reactive power drawn from the supply is 1296 kVAR
Real power drawn from the supply is 3245.4 W
A 230 V, 50 Hz, one-pulse SCR controlled converter has extinction angle β = 200°.
Find the circuit turn-off time
10 m-sec
0
8.9 m-sec
5.4 m-sec
Which of the following is a common technique to enhance the performance of gate
drivers?
Using low power supply voltage
Increasing the gate resistance
Adding a bootstrap circuit for high-side drive
Using a single-ended configuration
