Electronics and Communication Engineering - Analog Electronics

21. 

In a good voltage amplifier, its input impedance

A. must be high compared to the resistance of the source
B. must be low compared to the resistance of the source
C. must be equal to the resistance of the source
D. must be half the resistance of the source

Answer: Option A

Explanation:

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22. 

A non-inverting voltage feedback amplifier is a

A. voltage amplifier
B. current amplifier
C. current to voltage converter
D. voltage to current converter

Answer: Option A

Explanation:

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23. 

A Colpitt's oscillator uses

A. a tapped inductor
B. an inductor and two capacitors
C. both (a) and (b)
D. either (a) or (b)

Answer: Option C

Explanation:

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24. 

In every practical oscillator, the loop gain is slightly larger than unity and the amplitude of the oscillations is limited by the

A. magnitude of the loop gain
B. onset if non-linearity
C. magnitude of gain of the amplifier
D. feedback transmission factor

Answer: Option B

Explanation:

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25. 

IF amplifiers for radio receivers are often tuned to

A. 456 Hz
B. 456 kHz
C. 3456 MHz
D. 456 GHz

Answer: Option B

Explanation:

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