Free Printable Three-phase Controlled Rectifiers (Part 11)

1.

A half-wave rectifier can reduce DC voltage by regulating its firing angle. Choose two correct ranges of the firing angle in operating the rectifier.

a)

$0\le\alpha<30\degree$

b)

$0<\alpha<30\degree$

c)

$30\degree<\alpha\le120\degree$

d)

$30\degree<\alpha<120\degree$

2.

Choose the correct equation to calculate the average output voltage, $V_{DC}$ of a half-wave rectifier if the firing angle is 25°.

a)

$\frac{3V_{\phi}}{2\pi}\int_{0.96}^{\pi}\ \sin\left(\omega t\right)d\omega t$

b)

$\frac{3V_{\phi}}{\pi}\int_{0.96}^{\pi}\ \sin\left(\omega t\right)d\omega t$

c)

$\frac{3V_{\phi}}{2\pi}\int_{0.96}^{3.054}\ \sin\left(\omega t\right)d\omega t$

d)

$\frac{3V_{\phi}}{\pi}\int_{0.96}^{3.054}\ \sin\left(\omega t\right)d\omega t$

3.

A half-wave rectifier is supplying a resistive load from a three-phase 200 V, 50 Hz programmable supply voltage. The firing angle for the rectifier is 35 degrees. Determine the RMS output voltage.

a)

78.22 V

b)

78.43 V

c)

110.62 V

d)

110.92 V

4.

Choose the correct statements related to the operation of a half-wave rectifier when the firing angle, α is injected within 0 < α < 30°.

a)

The conduction range of each thyristor is shifting to the right.

b)

The conduction angle of each thyristor is remaining unchanged.

c)

The conduction angle of each thyristor is reducing.

d)

Continuous output voltage and current waveforms.

e)

Discontinuous output voltage and current waveforms.

5.

Choose the correct statements related to the operation of a half-wave rectifier when the firing angle, α is injected within 30° < α < 120°.

a)

The conduction range of each thyristor is shifting to the right.

b)

The conduction angle of each thyristor is remaining unchanged.

c)

The conduction angle of each thyristor is reducing.

d)

Continuous output voltage and current waveforms.

e)

Discontinuous output voltage and current waveforms.

6.

The maximum firing angle of a full-wave rectifier is 60°.

a)

True.

b)

False.

7.

By using the same firing angle, the wave shape of the output voltage of a full-wave rectifier with resistive load is similar to the output voltage waveform of the rectifier supplying a highly inductive load.

a)

True.

b)

False.

8.

A full-wave rectifier is supplying a highly inductive load from a three-phase 415 V, 50 Hz supply voltage. If the firing angle is 35 degrees, calculate the RMS output voltage of the rectifier.

a)

202.91 V

b)

332.37 V

c)

351.44 V

d)

470.04 V

9.

A highly inductive load draws 10 A current from a half-wave rectifier connected to a three-phase 415 V, 50 Hz supply voltage. The firing angle of the rectifier is 25°. If the source inductance is 5 mH per phase, calculate the average output voltage.

a)

172.1 V

b)

246.5 V

c)

344.2 V

d)

492.9 V

10.

A full-wave rectifier with a large inductive load converts the grid AC power to DC power. The voltage drop across a 10 mH source inductance is 50 V per phase. Determine the average output current supplied by the rectifier.

a)

17 A

b)

33 A

c)

50 A

d)

100 A

Three-phase Controlled Rectifiers (Part 11)

Total questions: 10

Worksheet time: 3hrs 30mins

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