In the circuit of figure the voltage across capacitor when switch is closed at t

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Question
In the circuit of figure the voltage across capacitor when switch is closed at t = ? is
Options
A. 0 V
B. 20 V
C. very large
D. 7.5 V

Correct Answer

7.5 V

Explanation

Voltage across capacitor = voltage across 3? resistance =

In the circuit of figure the voltage across capacitor when switch is closed at t = ? is 0 V 20 V ver

Networks Analysis and Synthesis problems

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1. The degree of the nodes 1, 2, 3, 4 is
Options
A. 2
B. 3
C. 2 for 1, 2, 3, and 3 for 4
D. all 3

2. The driving-point impedance Z(s) of a network has a pole-zero locations as shown in the figure. If Z(0) = 3, then Z (s) is
Options
A.
B.
C.
D.

3. A 3 phase balanced supply feeds 3 phase unbalanced load. Power supplied to the load can be measured by using
1. 2 wattmeter
2. one wattmeter
3. 3 wattmeter
Which of the above statements is correct?
Options
A. 1 and 2
B. 1 and 3
C. 2 and 3
D. 3 alone

4. A series RC circuit has R = 5 ? and C = 10 ?F. The current in the circuit is 5 sin 20000t. The applied voltage is
Options
A. 252 sin (20000t + 45�)
B. 252 sin (20000t - 45�)
C. 252 sin 20000t
D. 252 sin (20000t - 90�)

5. A sinusoidal voltage has peak to peak value of 100 V. The rms value is
Options
A. 50 V
B. 70.7 V
C. 35.35 V
D. 141.41 V

9. The impedance of an RC series circuit is 12 ? at f= 50 Hz. At f= 200 Hz, the impedance will be
Options
A. more than 12
B. less than 3
C. more than 3 ? but less than 12 ?
D. more than 12 ? but less than 24 ?

10. In the series circuit shown in figure, for series resonance, the value of the coupling coefficient, K will be
Options
A. 0.25
B. 0.5
C. 0.1
D. 1

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