127. At parallel resonance, the phase angle between the applied voltage and circuit current is
A. 90?
B. 180?
C. 0?
D. none of the above

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128. In a parallel LC circuit, if the signal frequency is decreased below the resonant frequency, then
A. X decreases and ; increases
B. X increases and ; decreases
C. line current becomes minimum
D. none of the above

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129. In series resonance, there is
A. voltage amplification
B. current amplification
C. both voltage and current amplification
D. none of the above

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130. The Q of a tuned amplifier is generally
A. less than 5
B. less than 10
C. more than 10
D. none of the above

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131. The Q of a tuned amplifier is 50 If the resonant frequency for the amplifier is 1000 kHz, then bandwidth is
A. 10 kHz
B. 40 kHz
C. 30 kHz
D. 20 kHz

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132. In the above question, what are the values of cut-off frequencies?
A. 140 kHz, 60 kHz
B. 1020 kHz, 980 kHz
C. 1030 kHz, 970 kHz
D. none of the aboe

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133.  For frequencies above theresonant frequency, a parallel LC circuit behaves as a ____load.
A. capacitive
B. resistive
C. inductive
D. none of the above

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