Electronics and Communication Engineering - Exam Questions Papers

36. 

Consider the voltage transfer characteristic of a standard CMOS inverter

where region A corresponds to

A. NMOS and PMOS triode
B. Both are saturation
C. NMOS saturated PMOS linear
D. None of these

Answer: Option C

Explanation:

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37. 

Assertion (A): Ideal current sources and ideal voltage sources do not exist in reality.

Reason (R): All sources have finite internal impedances.

A. Both A and R are individually true and R is the correct explanation of A
B. Both A and R are individually true but R is not the correct explanation of A
C. A is true but R is false
D. A is false but R is true

Answer: Option A

Explanation:

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38. 

A signal occupies a band 5 kHz to 10 kHz. For proper error free reconstruction at what rate it should be sampled?

A. 10 kHz
B. 20 kHz
C. 5 kHz
D. (10 + 5) x 2 kHz

Answer: Option A

Explanation:

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39. 

Which of the following circuits come under the class of combinational logic circuits?

  1. Full adder
  2. Full subtractor
  3. Half adder
  4. J-K flip-flop
  5. Counter
Select the correct answer from the codes given below:

A. 1 only
B. 3 and 4
C. 4 and 5
D. 1, 2 and 3

Answer: Option D

Explanation:

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40. 

Consider a 565 PLL with RT = 10 kΩ and CT = 0.01 μF. What is the output frequency of the VCO?

A. 10 kHz
B. 5 kHz
C. 2.5 kHz
D. 1.25 kHz

Answer: Option A

Explanation:

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