Electronics and Communication Engineering - Exam Questions Papers

41. 

Consider the following statements
A 4 : 16 decoder can be constructed (with enable i/p) by

  1. Using four 2 : 4 decoders (each with an enable i/p) only
  2. Using five 2 : 4 decoders (each with an enable i/p) only
  3. Using two 3 : 8 decoders (each with an enable i/p) only
  4. Using two 3 : 8 decoders (each with an enable i/p) only
Which of the statements given above is/are correct?

A. 2 and 3
B. 1 only
C. 2 and 4
D. none

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

42. 

If the carrier modulated by a digital bit stream has one of the possible phases of 0°, 90°, 180° and 270°. Then the modulation is called

A. BPSK
B. QPSK
C. QAM
D. MSK

Answer: Option B

Explanation:

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43. 

The internal resistance of a current source used in the model of a BJT while analyzing a circuit using BJT is :

A. very high
B. very low
C. zero
D. of the order of a few mega ohms

Answer: Option A

Explanation:

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44. 

Consider the network: Impedance of this network as a function of the complex frequency is consists of a certain number of zeros and poles. What is the location of poles?

A. -2
B. -2, ∞
C. 2
D. 2, ∞

Answer: Option B

Explanation:

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45. 

For the circuit shown in the given figure, assuming ideal op-amps, the output corresponding to the given input will be :

A.
B.
C.
D.

Answer: Option A

Explanation:

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