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Electronics Engineering Objective Questions { Operational Amplifier and Its Applications  }



134.  In parallel resonance, there is
A. both voltage and current amplification
B. voltage amplification
C. current amplification
D. none of the above
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135. For frequencies below resonant frequency, a series LC circuit behaves as a load.
A. resistive
B. capacitive
C. inductive
D. none of the above
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136.  If a high degree of selectivity is desired, then double-tuned circuit should have ____ coupling.
A. loose
B. tight
C. critical
D. none of the above
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137. In the double tuned circuit, if the mutual inductance between the two tuned circuits is decreased, the level of resonance curve
A. remains the same
B. is lowered
C. is raised
D. none of the above
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138. For frequencies above the resonant frequency, a series LC circuit behaves as a __ load.
A. resistive
B. inductive
C. capacitive
D. none of the above
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139.  Double tuned circuits are used in ___ stages of a radio receiver
A. IF
B. audio
C. output
D. none of the above
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140. A class C amplifier always drives____ load.
A. a pure resistive
B. a pure inductive
C. a pure capacitive
D. a resonant tank
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