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Electronics And Communication Engineering

In a series ac circuit a voltage of 20 V at 25 Hz causes a current of 0.20 A, while the same voltage at 75 Hz causes a current of 0.12 A. The circuit consists of

Electronics And Communication Engineering, Networks Analysis And Synthesis /
Question: In a series ac circuit a voltage of 20 V at 25 Hz causes a current of 0.20 A, while the same voltage at 75 Hz causes a current of 0.12 A. The circuit consists of
[A].

R and C in parallel

[B].

R and C in series

[C].

R and L in series

[D].

either (a) or (b)

Answer: Option B

Explanation:

As f increases impedance increases and current decreases in RL circuit.

In a series ac circuit a voltage of 20 V at 25 Hz causes a current of 0.20 A, while the same voltage at 75 Hz causes a current of 0.12 A. The circuit consists of Read More »

Electronics And Communication Engineering, Networks Analysis And Synthesis

In a series L-C circuit fed by ac voltage, voltage drops across L and C are 40 V and 30 V respectively. The supply voltage is

Electronics And Communication Engineering, Networks Analysis And Synthesis /
Question: In a series L-C circuit fed by ac voltage, voltage drops across L and C are 40 V and 30 V respectively. The supply voltage is
[A].

70 V

[B].

10 V

[C].

50 V

[D].

1.333 V

Answer: Option C

Explanation:

|V| = IXL – IXC.

In a series L-C circuit fed by ac voltage, voltage drops across L and C are 40 V and 30 V respectively. The supply voltage is Read More »

Electronics And Communication Engineering, Networks Analysis And Synthesis

In class C operation of an amplifier circuit, the collector current exists for

Analog Electronics, Electronics And Communication Engineering /
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.

In class C operation of an amplifier circuit, the collector current exists for Read More »

Analog Electronics, Electronics And Communication Engineering

A current 10 sin (200t) A flows through a 5 mH inductance. The expression for voltage is

Electronics And Communication Engineering, Networks Analysis And Synthesis /
Question: A current 10 sin (200t) A flows through a 5 mH inductance. The expression for voltage is
[A].

10 sin (200t + 90°)

[B].

10 sin (200t – 90°)

[C].

10 sin(1000t + 90°)

[D].

10 sin (1000t – 90°)

Answer: Option D

Explanation:

Z = jXL = jωL = = 1∠90° and V = IXL

A current 10 sin (200t) A flows through a 5 mH inductance. The expression for voltage is Read More »

Electronics And Communication Engineering, Networks Analysis And Synthesis

For the given truth table, the correct Boolean expression is

Digital Electronics, Electronics And Communication Engineering /
Question: For the given truth table, the correct Boolean expression is
[A].

XYZ + X YZ + X Y Z

[B].

X Y Z + XYZ + X YZ

[C].

X Y Z + XYZ + XY Z

[D].

XYZ + XYZ + XY Z

Answer: Option B

Explanation:

No answer description available for this question.

For the given truth table, the correct Boolean expression is Read More »

Digital Electronics, Electronics And Communication Engineering