Electronics and Communication Engineering - Networks Analysis and Synthesis

46. 

A sinusoidal voltage has peak to peak value of 100 V. The rms value is

A. 50 V
B. 70.7 V
C. 35.35 V
D. 141.41 V

Answer: Option C

Explanation:

Peak value = 50 V, rms value = = 35.35 V.


47. 

A capacitor is needed for an ac circuit of 230 V, 50 Hz the peak voltage rating of the capacitor should be

A. 230 V
B. 0.5 x 230 V
C. 2 x 230V
D. 230/2V

Answer: Option C

Explanation:

Peak voltage rating = 2 (rms voltage rating).


48. 

The current wave shape shown in figure (1) is applied to a circuit element. The voltage across the element is shown in figure (2). The element is

A. R
B. L
C. C
D. Semiconductor

Answer: Option C

Explanation:

When a current pulse is applied to a capacitor the voltage rises linearly and becomes constant at the end of pulse.


49. 

In figure, the current supplied by battery immediately after switching on the circuit is

A. 1 A
B. 4 A
C. 10 A
D. 0

Answer: Option A

Explanation:

At t = 0, inductance behaves as open circuit.


50. 

RMS value of i(t) = 10[1 + sin (- t)] is

A. 10
B. 10/2
C. l50
D. 102

Answer: Option C

Explanation:

.


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