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Electronic Devices - Power Amplifiers

Exercise : Power Amplifiers - General Questions
21.
Determine what maximum dissipation will be allowed for a 70-W silicon transistor (rated at 25ºC) if derating is required above 25ºC by a derating factor of 0.6 W/ºC at a case temperature of 100º.
25 W
30 W
35 W
40 W
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
How many transistors must be used in a class B power amplifier to obtain the output for the full cycle of the signal?
0
1
2
3
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
What transformer turns ratio is required to match an 8- speaker load so that the effective load resistance seen at the primary is 12.8 k?
20:1
40:1
50:1
60:1
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
Which of the following is (are) power amplifiers?
Class A
Class B or AB
Class C or D
All of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
Refer to the figure. The maximum efficiency of this amplifier is

about 25%.
about 78%.
about 70%.
about 100%.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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