Electronics And Communication Engineering | Networks Analysis And Synthesis

A variable resistance R and capacitive reactance XC are connected in series. As R is varied, the locus of Z is

Byadmin July 25, 2022

Question: A variable resistance R and capacitive reactance XC are connected in series. As R is varied, the locus of Z is
[A].

a straight line parallel to Y axis in 4th quadrant

[B].

a straight line parallel to X axis in 4th quadrant

[C].

a straight line parallel to Y axis in second quadrant

[D].

a straight line parallel to Y axis in first quadrant

Answer: Option C

Explanation:

No answer description available for this question.

Electronics And Communication Engineering | Networks Analysis And Synthesis

A coil of resistance R and inductance L is connected in series with 10 mF capacitor. The resonant frequency is 1000 Hz. Another 10 F capacitor is connected in parallel with the above capacitor. The new resonance frequency will be

Question: A coil of resistance R and inductance L is connected in series with 10 mF capacitor. The resonant frequency is 1000 Hz. Another 10 F capacitor is connected in parallel with the above capacitor. The new resonance frequency will be
[A].

1000 Hz
[B].
more than 1000 Hz
[C].
less than 1000 Hz
[D].
may be more or less than 10000 Hz

Answer: Option C

Explanation:

Total capacitance increases and therefore ωr decreases.

Read More A coil of resistance R and inductance L is connected in series with 10 mF capacitor. The resonant frequency is 1000 Hz. Another 10 F capacitor is connected in parallel with the above capacitor. The new resonance frequency will be
Electronics And Communication Engineering | Exam Questions Papers

Consider the following statements:The bias stability of an emitter-bias amplifier circuit improves by

Question: Consider the following statements:The bias stability of an emitter-bias amplifier circuit improves by
[A].

1 and 2
[B].
2 and 3
[C].
3 and 4
[D].
4 and 5

Answer: Option A

Explanation:

No answer description available for this question.

Read More Consider the following statements:The bias stability of an emitter-bias amplifier circuit improves by
Electronics And Communication Engineering | Networks Analysis And Synthesis

A series resonant circuit has inductance L. If L is increased, the resonant frequency

Question: A series resonant circuit has inductance L. If L is increased, the resonant frequency
[A].

increases
[B].
decreases
[C].
remains constant
[D].
may increases or decreases

Answer: Option B

Explanation:

. As L increases ωr decreases.

Read More A series resonant circuit has inductance L. If L is increased, the resonant frequency
Electronics And Communication Engineering | Networks Analysis And Synthesis

A variable resistance R and capacitive reactance XC are fed by an voltage. The current locus is

Question: A variable resistance R and capacitive reactance XC are fed by an voltage. The current locus is
[A].

a semi circle in 4th quadrant
[B].
a semi circle in first quadrant
[C].
a straight line in 4th quadrant
[D].
a straight line first quadrant

Answer: Option B

Explanation:

No answer description available for this question.

Read More A variable resistance R and capacitive reactance XC are fed by an voltage. The current locus is
Analog Electronics | Electronics And Communication Engineering

An RC oscillator uses

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.

Read More An RC oscillator uses
Digital Electronics | Electronics And Communication Engineering

Inputs A and B of the given figure are applied to a NAND gate. The output is LOW

Question: Inputs A and B of the given figure are applied to a NAND gate. The output is LOW
[A].

from 0 to 6
[B].
from 0 to 2
[C].
from 0 to 1 and 2 to 3
[D].
from 1 to 2 and 3 to 4

Answer: Option C

Explanation:

NAND gate gives Low output if all inputs are High. For other combinations of inputs, output is High.

Read More Inputs A and B of the given figure are applied to a NAND gate. The output is LOW

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