Analog Electronics

Question: A transistor has two p-n junctions. The batteries should be connected such that
[A].

both junctions are forward biased

[B].

both junctions are reverse biased

[C].

one junction is forward biased and the other is reverse biased

[D].

either (a) or (b)

Answer: Option C

Explanation:

Emitter base junction is forward biased and base-collector junction is reverse biased.

Question: As compared to a BJT amplifier circuit, a JFET amplifier circuit
[A].

has low input impedance

[B].

has high input impedance

[C].

has very low input impedance

[D].

may have either low or high input impedance

Answer: Option B

Explanation:

No answer description available for this question.

Question: At midband frequencies the coupling capacitor in RC coupled CE amplifier may be considered as
[A].

open circuit

[B].

short circuit

[C].

a reactance equal to load resistance

[D].

none of the above

Answer: Option B

Explanation:

No answer description available for this question.

Question: A transistor amplifier is operating in class A mode. If a transformer is connected for impedance matching, the efficiency will
[A].

increase

[B].

decrease

[C].

not be affected

[D].

increase or decrease

Answer: Option A

Explanation:

No answer description available for this question.

Question: If the midband gain of an amplifier is 40 dB, the gain at half power frequency is
[A].

37 dB

[B].

30 dB

[C].

20 dB

[D].

13 dB

Answer: Option A

Explanation:

Half power frequency is -3 dB frequency.

Question: A push pull amplifier is a
[A].

power amplifier

[B].

voltage amplifier

[C].

current amplifier

[D].

both power and current amplifier

Answer: Option A

Explanation:

No answer description available for this question.

Question: For class B operation the theoretical maximum efficiency is
[A].

100%

[B].

78.5%

[C].

50%

[D].

27.5%

Answer: Option B

Explanation:

No answer description available for this question.

Question: In class C operation of an amplifier circuit, the collector current exists for
[A].

360° of input wave

[B].

180° of input wave

[C].

more than 180° of input wave

[D].

less than 180° of input wave

Answer: Option D

Explanation:

In class C operation output is in the form of short duration pulses.

Question: In the analysis of common emitter amplifier we may neglect
[A].

hre

[B].

hoe

[C].

hfe

[D].

hie

Answer: Option A

Explanation:

No answer description available for this question.

Question: In the graphical analysis of an amplifier circuit, the slope of dc load line depends on
[A].

load resistance only

[B].

collector supply voltage only

[C].

both load resistance and collector supply voltage

[D].

none of the above

Answer: Option A

Explanation:

Slope is .