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WorksheetsSingle-phase Controlled Rectifiers (Part 6)
Total questions: 10
Worksheet time: 49mins
Choose power switches used in controlled rectifier circuits.
BJTs
Diodes
IGBTs
Thyristors
During the positive half-cycle of the supply voltage, the power switches of controlled rectifiers are automatically turn-on.
True
False
Choose the requirements to turn-on the thyristors in a controlled full-wave rectifiers.
The anode terminal of the thyristors is positive.
The cathode terminal of the thyristor is positive.
The half-cycle of the AC supply voltage is positive.
Applying a control signal to the gate terminal of the thyristors.
The function of controlled rectifiers is to vary the DC power supplied to the load.
True
False
Under typical operation, the current conduction range of controlled rectifiers is larger than uncontrolled rectifiers.
True
False
Calculate the RMS output current if the firing angle is 28⁰
3.57 A
3.61 A
5.05 A
5.11 A
Determine the average value of vo(t) if the firing angle, α is 35⁰. Note: Vm = 100 V.
28.95 V
31.83 V
40.95 V
57.91 V
Find the R value if the average output voltage of the rectifier is 57 W, and the firing angle is 20⁰.
16.72 Ω
33.44 Ω
66.88 Ω
133.76 Ω
The figure shows the output voltage vo(t) waveform of a controlled full-wave rectifier with a resistive load. The input voltage equation is 150 sin (ωt), and the firing angle is 140⁰. Determine the rectification ratio, η.
8%
17%
41%
81%
A single-phase controlled bridge rectifier is converting 230 V, 50 Hz AC voltage. The rectifier is supplying 780 W average power to a 50 Ω resistive load. Identify the conduction angle of each thyristor.
155.1⁰
180⁰
335.1⁰
360⁰
