Entry Test MCQ :: Electronics
|
|
|
|
|
21. |
In full wave rectification the output D.C. voltage across the load is obtained for |
A. |
The positive half cycle of input A.C. |
B. |
The negative half cycle of input A.C. |
C. |
The complete cycle of input A.C. |
D. |
All of the above. |
Answer: Option C
Explanation:
|
22. |
The semiconductor diode can be used as a rectifier because _ |
A. |
It has low resistance to the current flow when forward biased & high resistance when reverse biased. |
B. |
It has low resistance to the current flow when forward biased. |
C. |
It has high resistance to the current flow when reverse biased |
D. |
Its conductivity increases with rise of temperature. |
Answer: Option A
Explanation:
|
23. |
In half-wave rectification the output D.C. voltages is obtained across the load for |
A. |
The negative half cycle of A.C. |
B. |
The positive half cycle of A.C. |
C. |
The positive and negative half cycles |
D. |
Either positive or negative half of A.C. |
Answer: Option B
Explanation:
|
24. |
The device or circuit used for conversion of A.C. into D.C. is called |
A. |
An amplifier. |
B. |
A rectifier |
C. |
Filtering circuit |
D. |
Converter. |
Answer: Option B
Explanation:
|
25. |
The device used for conversion of D.C. to A.C. is called |
A. |
Converter |
B. |
A rectifier |
C. |
Inverter |
D. |
Oscillator |
Answer: Option D
Explanation:
|
26. |
The especially designed semiconductor diodes used as indicator lamps in electronic circuits are |
A. |
The switch |
B. |
The light emitting diode |
C. |
The photo diodes |
D. |
Solar cells. |
Answer: Option B
Explanation:
|
27. |
The specially designed semi-conductor diodes used as fast counters in electronic circuits are |
A. |
The light emitting diodes |
B. |
Photo diodes |
C. |
Photo voltaic cell |
D. |
Solar cells. |
Answer: Option B
Explanation:
|
28. |
The alternating voltage is an example of |
A. |
A digital waveform |
B. |
An analogue waveform |
C. |
Discrete waveform |
D. |
None at all |
Answer: Option B
Explanation:
|
29. |
The rectangular voltage is an example of |
A. |
An analogue waveform |
B. |
Continuous wave form |
C. |
Electronic waveform |
D. |
A digital waveform |
Answer: Option D
Explanation:
|
30. |
The operational amplifier is |
A. |
A high gain amplifier |
B. |
A high-power amplifier |
C. |
A high resistance amplifier |
D. |
A low resistance amplifier |
Answer: Option A
Explanation:
|
Read more:
|
|