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49.

For a series R-L-C resonant circuit, which one of the following gives the impedances at the lower and upper half power frequencies, respectively?
a. √2R ∠45°; √2R ∠-45°
b. R/√2 ∠-45°; R/√2 ∠45°
c. R ∠45°; R ∠-45°
d. √2R ∠-45°; √2R ∠45°

asked in Electrical Paper-1, 2007

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50.

Consider the following statements.
If a high-Q parallel resonant circuit loaded, then
1. the circuit impedance reduces.
2. the resonant frequency reduces.
3. the bandwidth reduces.
Which of the statements given above is/are correct?
(a) 1 and 2
(b) 1 only
(c) 2 and 3
(d) 1, 2 and 3

asked in Electrical Paper-1, 2007

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51.

An impedance function has poles and zeros as follows:
poles -1, - 3; zeros - 2, - 4 and impedance has its value Z(0) =8. Then which one of the following expresses Z(s)?
a. (s²+4s+3)/(s²+6s+8)
b. (3s²+12s+9)/(s²+6s+8)
c. (s²+6s+8)/(s²+4s+3)
d. (3s²+18s+24)/(s²+4s+3)

asked in Electrical Paper-1, 2007

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52.

In the given network,S is closed for a long time till steady state is attained. S is opened at t =0. What are the value of voltage V at t = 0⁺ and t = ∞?

(a) 8 V, 8 V
(b) 4 V, 8 V
(c) 8 V, 4 V
(d) 4 V, 4 V

asked in Electrical Paper-1, 2007

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53.

The circuit shown in the given figure is in steady state with switch S open. The switch is closed at t =0. What are the values of V_c(0⁺) and V_c(∞) , respectively?

(a) 0V, 1V
(b) 0 V, 2 V
(c) 2 V, 0 V
(d) 2 V, 2 V

asked in Electrical Paper-1, 2007

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54.

Assertion (A): Dual slope ADC is the most preferred digital conversion approach in digital multimeters.
Reason (R): Dual slope ADC provides high accuracy in A/D conversion which at the same time suppressing the hum effect on the input signal.
(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

asked in Electrical Paper-1, 2007

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