Analog Electronics

Question: A Wien bridge is suitable for
[A].

audio frequencies only

[B].

radio frequencies only

[C].

both audio and radio frequencies

[D].

very low frequencies only

Answer: Option A

Explanation:

No answer description available for this question.

Question: A Wien bridge oscillator uses Wien bridge for
[A].

tuning and phase shift

[B].

tuning

[C].

phase shift

[D].

either tuning or phase shift

Answer: Option A

Explanation:

No answer description available for this question.

Question: An RC oscillator uses
[A].

one RC combination

[B].

two RC combinations

[C].

at least three RC combinations

[D].

either (a) or (b)

Answer: Option C

Explanation:

One RC combination can give a phase shift of less them 90°. Therefore 3 RC combinations are required for 180° phase shift.

Question: A Clapp’s oscillator is
[A].

a modified Hartley oscillator

[B].

a modified Colpitt’s oscillator

[C].

a modified RC oscillator

[D].

none of the above

Answer: Option B

Explanation:

No answer description available for this question.

[A]. a tapped inductor[B]. an inductor and two capacitors

[C].both (a) and (b)

[D]. either (a) or (b)

Answer: Option C

Explanation:

No answer description available for this question.

Question: A Hartley oscillator uses
[A].

a tapped inductor

[B].

a tapped capacitor

[C].

both (a) and (b)

[D].

neither (a) nor (b)

Answer: Option A

Explanation:

No answer description available for this question.

Question: An RC coupled amplifier has an open loop gain of 200 and a lower cutoff frequency of 50 Hz. If negative feedback with β = 0.1 is used, the lower cut off frequency will be
[A].

about 50 Hz

[B].

about 5 Hz

[C].

about 2.38 Hz

[D].

about 70.5 Hz

Answer: Option C

Explanation:

New lower cutoff frequency = .

Question: A rectifier circuit has load resistance R. It uses a capacitance filter having capacitance C. For low ripple in the output
[A].

RC should be 1

[B].

RC should be low

[C].

RC should be high

[D].

RC should be neither low nor high

Answer: Option C

Explanation:

No answer description available for this question.

Question: A full wave rectifier using centre tapped transformer and a bridge rectifier use similar diodes and have equal no load output voltage. Under equal load conditions
[A].

Output voltage of bridge rectifier

[B].

Output voltage of bridge rectifier will be more than that of other

[C].

Output voltage of both will be exactly equal

[D].

Output voltage of any one may be more than that of other

Answer: Option A

Explanation:

Since two diodes are in series bridge rectifier, voltage drop is more.

Question: As compared to full wave rectifier, a half wave rectifier
[A].

has higher ripple factor

[B].

has lower ripple factor

[C].

may have higher or lower ripple factor

[D].

has same ripple factor

Answer: Option A

Explanation:

No answer description available for this question.