Free Printable Three-phase Uncontrolled Rectifiers (Part 8)

1.

When we want to sketch the three-phase voltage waveforms, which parameter helps us to identify the starting point of each waveform?

a)

Voltage amplitude

b)

Sine function

c)

Phase angle

d)

Non

2.

What is the connection of the three-phase voltage supply shown in the figure?

a)

Delta

b)

Wye or star

3.

How many diodes in the half-wave rectifier circuit?

a)

1

b)

2

c)

3

d)

4

4.

In the operation of a half-wave rectifier, how many diode turn-on at one time?

a)

1

b)

2

c)

3

d)

Non

5.

Which diode will turn-on during $\frac{5\pi}{6}\le\omega t\le\frac{3\pi}{2}$

a)

D1

b)

D2

c)

D3

d)

Non

6.

During $\frac{\pi}{6}\le\omega t\le\frac{5\pi}{6}$ , diode ____ turn-on and conduct the ____ line current.

a)

D1

b)

D2

c)

RED

d)

YELLOW

7.

Choose the output current equation.

a)

$i_o\left(t\right)=i_R\left(t\right)+i_Y\left(t\right)$

b)

$i_o\left(t\right)=i_Y\left(t\right)+i_B\left(t\right)$

c)

$i_o\left(t\right)=i_R\left(t\right)+i_B\left(t\right)$

d)

$i_o\left(t\right)=i_R\left(t\right)+i_Y\left(t\right)+i_B\left(t\right)$

8.

A half-wave rectifier connected to a three-phase 50 Hz voltage supply. If the rectifier operates for 40 ms, how many voltage pulses in the output voltage waveform of the rectifier?

a)

3

b)

6

c)

9

d)

12

9.

A half-wave rectifier is supplying a 25 Ω resistor from a three-phase 400 V, 50 Hz voltage supply. What is the peak amplitude, VΦ of the phase voltage?

a)

230.9 V

b)

326.6 V

c)

400 V

d)

565.7 V

10.

A half-wave rectifier is supplying a 25 Ω resistor from a three-phase 400 V, 50 Hz voltage supply. Calculate the average output voltage.

a)

191 V

b)

194.2 V

c)

270.1 V

d)

274.6 V

Three-phase Uncontrolled Rectifiers (Part 8)

Total questions: 10

Worksheet time: 2hrs 16mins

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