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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 20
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?
2 and 3
1 only
2 and 4
none
Answer: Option
Explanation:
No answer description is available. Let's 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
BPSK
QPSK
QAM
MSK
Answer: Option
Explanation:
No answer description is available. Let's discuss.
43.
The internal resistance of a current source used in the model of a BJT while analyzing a circuit using BJT is :
very high
very low
zero
of the order of a few mega ohms
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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?
-2
-2, ∞
2
2, ∞
Answer: Option
Explanation:
No answer description is available. Let's discuss.
45.
For the circuit shown in the given figure, assuming ideal op-amps, the output corresponding to the given input will be :
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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