Electronics And Communication Engineering

If it is desired to have low output impedance in an amplifier circuit then we should use

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Question: If it is desired to have low output impedance in an amplifier circuit then we should use
[A].

common collector circuit

[B].

common base circuit

[C].

common emitter circuit

[D].

either (b) or (c)

Answer: Option A

Explanation:

Therefore CC configuration is used for impedance matching.

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

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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.

In a series RLC circuit the phase angle θ of impedance Z ∠θ is positive. The circuit will behave as

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Question: In a series RLC circuit the phase angle θ of impedance Z ∠θ is positive. The circuit will behave as
[A].

resistive circuit

[B].

RC circuit

[C].

RL circuit

[D].

either RL or RC circuit

Answer: Option B

Explanation:

In RL circuits phase angle of Z is positive.

In figure the switch has been in position 1 for a long time. At t = 0, the switch is moved to position 2. The equation for transient current is

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Question: In figure the switch has been in position 1 for a long time. At t = 0, the switch is moved to position 2. The equation for transient current is
[A].

[B].

[C].

[D].

Answer: Option C

Explanation:

When switch is in position 2, time constant is

Assertion (A): As the length of the resonant antenna is increased, the number of lobes increases and the direction of the major lobes is closer and closer to the direction of the diode.Reason (R): As the length increases, the current distribution along the wire becomes more and more uniform.

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Question: Assertion (A): As the length of the resonant antenna is increased, the number of lobes increases and the direction of the major lobes is closer and closer to the direction of the diode.Reason (R): As the length increases, the current distribution along the wire becomes more and more uniform.
[A].

Both A and R are individually true and R is the correct explanation of A

[B].

Both A and R are individually true but R is not the correct explanation of A

[C].

A is true but R is false

[D].

A is false but R is true

Answer: Option C

Explanation:

No answer description available for this question.