Electronics and Communication Engineering - Analog Electronics

21. 

The pinch-off voltage is the drain voltage on the shorted gate drain curve above which the drain current becomes

A. almost negligible
B. very high
C. almost constant
D. highly variable

Answer: Option C

Explanation:

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22. 

Which of the following plot can be used to show the input volt-ampere characteristics of a common-emitter configuration?

A. VBE versus iB for constant values of VCE
B. VCE versus iC for constant values of IB
C. VCE versus iC for constant values of IE
D. None of the above

Answer: Option A

Explanation:

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23. 

A transconductance amplifier has

A. high input impedance and low output impedance
B. low input impedance and high output impedance
C. high input and output impedance
D. low input and output impedance

Answer: Option C

Explanation:

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24. 

The signal input to a given amplifier is made up of 100 mΩ signal power and 1 mΩ noise power. The amplifier contributes an additional 100 mΩ of noise and has a power gain of 20 dB. The output signal-to-noise ratio is

A. 100
B. 50
C. 10
D. 5

Answer: Option B

Explanation:

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25. 

In order to protect a MOSFET against damage from any stray voltage at the gate

A. grounding rings are provided
B. terminals are shorted
C. source terminal is earthed during transit
D. none of these

Answer: Option C

Explanation:

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