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- 1. Multiple Choice
what is a diodes function
allows current to flow in one direction
allows current to flow in two directions
is a resistor
- 2. Multiple Choice
when a Diode is used as a half wave rectifier ....
It rectifies only one half of the input AC signal
It rectifies both the halves of the input AC signal
- 3. Multiple Choice
Which image shows the output of a sine-wave after it has gone through a diode? (Half-wave rectified)
- 4. Multiple Choice
What electrical component is used to smooth half wave current signals?
Resistor
Diode
Capacitor
Voltage regulator
- 5. Multiple Choice
halfwave rectified
fullwave rectified
sine wave
light bulb
- 6. Multiple Choice
Which component of a circuit is used to measure current?
- 7. Multiple Choice
The function of rectifier is
To increase or decrease the AC voltage in a circuit
Converting the AC voltage into pulse DC voltage
Smooth out the ripple contained in the pulses of pulse DC voltage
Maintain a constant DC voltage output across a load
- 8. Multiple Choice
The number of diodes used to build a bridge rectifier
1
2
3
4
- 9. Multiple Choice
A simple diode rectifier has ‘ripples’ in the output wave which makes it unsuitable as a DC source. To overcome this one can use
A capacitor in series with a the load resistance
A capacitor in parallel to the load resistance
Both of the mentioned situations will work
None of the mentioned situations will work
- 10. Multiple Choice
The applied input a.c. power to a half-wave rectifier is 100 watts. The d.c. output power obtained is 40 watts. What is the rectification efficiency ?
40%
60%
80%
90%
- 11. Multiple Choice
Efficiency of a centre tapped full wave rectifier is _________
a) 50%
b) 46%
c) 70%
d) 81.2%
50%
46%
70%
81.2%
- 12. Multiple Choice
If input frequency is 50Hz for a full wave rectifier, the ripple frequency of it would be _________
100Hz
50Hz
25Hz
500Hz
- 13. Multiple Choice
If the peak voltage on a centre tapped full wave rectifier circuit is 5V and diode cut in voltage is 0.7. The peak inverse voltage on diode is_________
4.3V
9.3V
5.7V
10.7V
- 14. Multiple Choice
The ripple factor of a bridge rectifier is
0.482
0.8l2
l.ll
1.21
- 15. Multiple Choice
A bridge rectifier is preferable to an ordinary two-diode full-wave rectifier because
It needs much smaller transformer for the same output.
It uses four diodes.
Its transformer does not require center-tap.
None of the above.
- 16. Multiple Choice
The basic purpose of a filter is to
Minimize variations in a.c. input signal.
Suppress harmonics in rectified output.
Remove ripples from the rectified output
Stabilize d.c. output voltage
- 17. Multiple Choice
. In a bridge type full wave rectifier, if Vm is the peak voltage across the secondary of the transformer, the maximum voltage coming across each reverse biased diode is
Vm
2 Vm
Vm/2
Vm/√2
- 18. Multiple Choice
To get a peak load voltage of 40V out of a bridge rectifier. What is the approximate rms value of secondary voltage?
0v
14.4v
28.3v
56.6v
- 19. Multiple Choice
In a LC filter, the ripple factor,
Increases with the load current
increases with the load resistance
remains constant with the load current
has the lowest value
- 20. Multiple Choice
In a rectifier, larger the value of shunt capacitor filter,
larger the peak-to-peak value of ripple voltage
larger the peak current in the rectifying diode
longer the time that current pulse flows through the diode
smaller the dc voltage across the load
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