Electronics And Communication Engineering Archives

A Wien bridge is suitable for

September 30, 2022 by admin

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.

A Wien bridge oscillator uses Wien bridge for

September 29, 2022 by admin

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.

A dc machine has 6 poles all connected in series. Each pole has 9 H inductance and field current is 2 A. Total inductance and total energy stored are

September 29, 2022 by admin

Question: A dc machine has 6 poles all connected in series. Each pole has 9 H inductance and field current is 2 A. Total inductance and total energy stored are
[A].

9 H and 18 J

[B].

18 H and 36 J

[C].

54 H and 108 J

[D].

108 H and 216 J

Answer: Option C

Explanation:

Total L = 6 x 9 = 54 H.

Energy = x 54 x 22 = 108 J.

An RC oscillator uses

September 29, 2022 by admin

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.

A NOR gate has 3 inputs A, B, C. For which combination of inputs is output HIGH

September 29, 2022 by admin

Question: A NOR gate has 3 inputs A, B, C. For which combination of inputs is output HIGH
[A].

A = B = C = 0

[B].

A = B = C = 1

[C].

A = B = 1 and C = 0

[D].

A = C = 1 and B = 0

Answer: Option A

Explanation:

NOR gate gives High output when all inputs are Low.

A Clapp’s oscillator is

September 21, 2022 by admin

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.

K maps can be drawn

September 21, 2022 by admin

Question: K maps can be drawn
[A].

only for 2 variables

[B].

only for 3 variables

[C].

only for 4 variables

[D].

for any number of variables

Answer: Option D

Explanation:

No answer description available for this question.

A series resonant circuit has R = 2 Ω, L = 0.1 H and C =10 μF. At resonance applied voltage = 10 ∠0 V. Voltage across inductance is likely to be

September 21, 2022 by admin

Question: A series resonant circuit has R = 2 Ω, L = 0.1 H and C =10 μF. At resonance applied voltage = 10 ∠0 V. Voltage across inductance is likely to be
[A].

10 ∠0 V

[B].

10 ∠45° V

[C].

100 ∠90° V

[D].

100 ∠-90° V

Answer: Option C

Explanation:

Voltage across inductance = QV and leads the applied voltage.

A Colpitt’s oscillator uses

September 25, 2022September 21, 2022 by admin

Question: A Colpitt’s oscillator uses?

[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.

A two branch parallel tuned circuits has a coil of resistance R and inductance L in one branch and capacitance C in the second branch. The bandwidth is 200 radians/sec. A load of resistance RL is connected in parallel. The new bandwidth will be

September 21, 2022 by admin

Question: A two branch parallel tuned circuits has a coil of resistance R and inductance L in one branch and capacitance C in the second branch. The bandwidth is 200 radians/sec. A load of resistance RL is connected in parallel. The new bandwidth will be
[A].

200 rad/sec

[B].

more than 200 rad/sec

[C].

less than 200 rad/sec

[D].

200 rad/sec or less

Answer: Option B

Explanation:

Loading increases bandwidth of parallel tuned circuii.