Electronics and Communication Engineering - Analog Electronics

36. 

The noise figure is

A. 3 dB
B. 6 dB
C. 6.6 dB
D. 12 dB

Answer: Option A

Explanation:

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37. 

A Darlington pair is used for

A. low distortion
B. high frequency range
C. high power gain
D. high current gain

Answer: Option D

Explanation:

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38. 

In a shunt-shunt negative feedback amplifier, as compared to the basic amplifier

A. both input and output impedances, decrease
B. input impedance decreases but output impedance increase
C. I/P impedance increases but O/P impedance decreases
D. both input and O/P impedance increases

Answer: Option B

Explanation:

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39. 

In rectifiers the use of RC filters is recommended when

A. load current is high
B. load current is small
C. load current is neither high nor small
D. either (a) or (c)

Answer: Option B

Explanation:

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40. 

The coupling capacitor mainly affects

A. bandwidth
B. lower cut-off frequency
C. higher cut-off frequency
D. both lower as well as higher cut-off frequency

Answer: Option B

Explanation:

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