Electronics - Diode Applications
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It covers diode applications.
- 1.The average value of a half-wave rectified voltage with a peak value of 200V is
- A.
63.7V
- B.
127.3 V
- C.
141 V
- D.
0 V
- 2.When a 60Hz sinusoidal voltage is applied to the input of a half-wave rectifier, the output frequency is
- A.
120 Hz
- B.
30 Hz
- C.
60 Hz
- D.
0 Hz
- 3.The peak value of the input to the half-wave rectifier is 10V. The approximate peak value of the output is
- A.
10 V
- B.
3.18 V
- C.
10.7 V
- D.
9.3 V
- 4.The diode, in a half wave rectifier with a peak input of 10V, must be able to withstand a reverse voltage of
- A.
10 V
- B.
5 V
- C.
20 V
- D.
3.18 V
- 5.The average value of a full-wave rectified voltage with a peak value of 75V is
- A.
53 V
- B.
47.8 V
- C.
37.5 V
- D.
23.9 V
- 6.When a 60Hz sinusoidal voltage is applied to the input of a full-wave rectifier, the output frequency is
- A.
120 Hz
- B.
60 Hz
- C.
240 Hz
- D.
0 Hz
- 7.The total secondary voltage in a center-tapped full-wave rectifier is 125Vrms. Neglecting the diode drop, the rms output voltage is
- A.
125 V
- B.
177 V
- C.
100 V
- D.
62.5 V
- 8.When the peak output voltage is 100V, the PIV for each diode in a center-tapped full-wave rectifier is (neglecting the diode drop)
- A.
100 V
- B.
200 V
- C.
141 V
- D.
50 V
- 9.When the rms output voltage of a bridge full-wave rectifier is 20V, the peak inverse voltage across the diodes is (neglecting the diode drop)
- A.
20 V
- B.
40 V
- C.
28.3 V
- D.
56.6 V
- 10.The ideal dc output voltage of a capacitor-input filter is equal to
- A.
The peak value of the rectified voltage
- B.
The average value of the rectified voltage
- C.
The rms value of the rectified voltage
- D.
Twice the value of the rectified voltage
- 11.A certain power-supply filter produces an output with a ripple of 100mV peak-to-peak and a dc value of 20V. The ripple factor is
- A.
0.05
- B.
0.005
- C.
0.00005
- D.
0.02
- 12.A 60V peak full-wave rectified voltage is applied to a capacitor-input filter. If f = 120 Hz, RL=10 kΩ and C=10 µF, the ripple voltage is
- A.
0.6 V
- B.
6 mV
- C.
5.0 V
- D.
2.88 V
- 13.If the load resistance of a capacitor-filtered full-wave rectifier is reduced, the ripple voltage
- A.
Increases
- B.
Is not affected
- C.
Decreases
- D.
Has a different frequency
- 14.Line regulation is determined by
- A.
Load current
- B.
Zener current and load current
- C.
Changes in load resistance
- D.
Changes in zener current and load current
- 15.Load regulation is determined by
- A.
Changes in load current and input voltage
- B.
Changes in load current and output voltage
- C.
Changes in load resistance and input voltage
- D.
Changes in zener current and load current
- 16.A 10 V peak-to-peak sinusoidal voltage is applied across a silicon diode and series resistor. The maximum voltage across the diode is
- A.
9.3 V
- B.
5 V
- C.
0.7 V
- D.
10 V
- E.
4.3 V
- 17.In the input voltage to a voltage tripler has an rms value of 12 V, the dc output voltage is approximately
- A.
36 V
- B.
50.9 V
- C.
33.9 V
- D.
32.4 V
- 18.If one of the diode in a bridge full-wave rectifier opens, the output is
- A.
0 V
- B.
A half-wave rectified voltage
- C.
One-fourth the amplitude of the input voltage
- D.
A 120 Hz voltage
- 19.If you are checking a 60Hz full-wave bridge rectifier and observe that the output has a 60Hz ripple,
- A.
The circuit is working properly
- B.
The transformer secondary is shorted
- C.
There is an open diode
- D.
The filter capacitor is leaky
- 20.If one of the diode in a half-wave rectifier opens, the output is
- A.
0 V
- B.
A half-wave rectified voltage
- C.
One-fourth the amplitude of the input voltage
- D.
A 120 Hz voltage
- 21.If one of the diodes in a bridge rectifier shorts,
- A.
The shorted diode may still function
- B.
The transformer will be damaged
- C.
The circuit will be half-wave rectifier
- D.
Load current will be minimum
- 22.When the primary winding of the transformer in a power supply opens, output voltage is
- A.
0 V
- B.
A half-wave rectified voltage
- C.
One-fourth the amplitude of the input voltage
- D.
A 120 Hz voltage
- 23.In a half-wave rectifier, the current through the load is approximately
- A.
The same as the input cycle
- B.
50% of the input cycle
- C.
One-fourth the amplitude of the input current
- D.
A 60Hz current
- 24.
- A.
A full-wave voltage occurs on each half of the input cycle and has the frequency of twice the input frequency.
- B.
A half-wave voltage occurs once each input cycle and has the frequency equal to the half of the input frequency.
- C.
A full-wave voltage occurs on each half of the input cycle and has the period twice the input period.
- D.
A half-wave voltage occurs once each half of the input cycle and has the frequency equal to the half of the input frequency.
- 25.Which type of full-wave rectifier has the greater output voltage for the same input voltage and transformer turns ratio?
- A.
Center-tapped full-wave rectifier
- B.
Bridge full-wave rectifier
- C.
Non-center-tapped full-wave rectifier
- D.
All (a), (b) and (c) have the same output voltage
- 26.What is the average value of a full-wave rectified voltage with a peak value of 60V?
- A.
19.1 V
- B.
38.1 V
- C.
84.8 V
- D.
42.4 V
- 27.
- A.
+1.4 V
- B.
+0.7 V
- C.
-1.4 V
- D.
-0.7 V
- 28.Diode _____ add a dc level to an ac voltage.
- A.
Limiters
- B.
Clampers
- C.
Voltage multipliers
- D.
Rectifiers
- 29.Which of the following is true?
- A.
The smaller the ripple voltage, the better the filter.
- B.
The higher the ripple voltage, the better the filter.
- C.
The quality of filter does not depend on the ripple voltage.
- D.
High ripple voltage is caused by the power dissipated in the load resistor.
- 30.Diode _______ cut off voltage above or below specified levels.
- A.
Limiters
- B.
Clampers
- C.
Voltage multipliers
- D.
Rectifiers
- 31.A capacitor in a power supply used to reduced the variation of the output voltage from a rectifier.
- A.
Filter
- B.
Mica
- C.
Ceramic
- D.
Mylar
- 32.A circuit that converts an ac sinusoidal input voltage into a pulsating dc voltage with two output pulses occurring for each input cycle.
- A.
Half-wave rectifier
- B.
Full-wave rectifier
- C.
Clipper
- D.
Clamper
- 33.A circuit that converts an ac sinusoidal input voltage into a pulsating dc voltage with one output pulse occurring for each input cycle.
- A.
Half-wave rectifier
- B.
Full-wave rectifier
- C.
Clipper
- D.
Clamper
- 34.The maximum value of reverse voltage which occurs at the peak of the input cycle when the diode is reversed-biased.
- A.
Rms voltage
- B.
Peak voltage
- C.
Average voltage
- D.
Peak inverse voltage
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