50. At parallel resonance, the circuit offers impedance equal to

A. UCR

B. LC/R

C.RL/C

D.CR/L

51. The Q-factor of a parallel resonant circuit is given by

A. RC

B. R L

C. RLC

D. none of the above

52. At parallel resonance, the circuit draws a current of 2 mA. If the Q of he circuit is 100, then current through the capacitor is

A. 2 mA

B. 1 mA

C. 200 mA

D. none of the above

53. In a parallel RC circuit with R> Xc, the phase angle will be

A.450

B. greater than 450

C.900

D. insufficient data

54. When it is not appropriate to use the formula fr = 1/2E ,r1.7 for a practical parallel LC circuit?

A. when Q of inductor is less than 10

B. when Q of inductor is more than 10

C. when Q of inductor is less than 100

D. none of above

55. In a practical parallel resonant circuit

A. IL = lc

B. IL > Ic

C. IL < lc

D. IL = 100 lc

56. In a parallel resonant LC circuit, the line current is

A. equal to IL or lc

B. much greater than IL or lc

C. much less than IL or lc

D. none of above

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