Exercise: Analog Electronics

Questions for: Analog Electronics

A transistor has a power rating of 8 W for a case temperature of 25°C. If derating factor is 30 mW/°C, the power rating for 55°C, case temperature is
A:
8 W
B:
7.5 W
C:
7.1 W
D:
6.8 W
Answer: C

Power rating = 8 - (55 - 25)(30 x 10-3) = 7.1 W.

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The disadvantage of direct coupled amplifiers is
A:
drift
B:
large size of transistor
C:
low voltage gain
D:
both (b) and (c)
Answer: A

The drift is amplified by different stages.

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A full wave bridge diode rectifier uses diodes having forward resistance of 50 ohms each. The load resistance is also 50 ohms. The voltage regulations is
A:
20%
B:
50%
C:
100%
D:
200%
Answer: D

No load output voltage =

Output voltage at full load =

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An oscillator requires an amplifier
A:
with negative feedback
B:
with positive feedback
C:
with either positive or negative feedback
D:
none of the above
Answer: B

Positive feedback is necessary for sustained oscillations.

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Assertion (A): In CE amplifier the emitter is at ground potential for ac signals

Reason (R): A CE amplifier has near unity voltage gain

A:
Both A and R are correct and R is correct explanation for A
B:
Both A and R are correct but R is not correct explanation for A
C:
A is correct R is wrong
D:
A is wrong R is correct
Answer: C

CE amplifier has good voltage gain.

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