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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 21
16.
Consider the transmission line of length 37.5 cm, which is terminated into zero resistance. This line is being exited by a source of 1 GHz which has an internal impedance of 50 Ω. What is the input impedance of the line as seen by the source?
50 Ω
Zero Ω
100 Ω
Infinite Ω
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
The junction capacitance of a linearly graded pn junction (with applied voltage = VB) is proportional to
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
Consider the following statements:
For a square waveguide of cross-section 3m x 3m it has been found
  1. At 6 GHz dominant mode will propagate
  2. At 4 GHz only dominant modes and evanescent
  3. At 11 GHz all the modes and no higher order mode will propagate
  4. At 7 GHz degenerate modes will propagate
Which of the above statements are correct?
1 and 2 only
1, 2 and 4
2 and 3 only
2, 3 and 4
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
The circuit shown depicts :
voltage series negative feedback
voltage shunt negative feedback
current series negative feedback
current shunt negative feedback
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
Which of the transistor models is most preferred for the analysis of a transistor circuit both at mid-band and at high frequencies?
h-parameter model
y-parameter model
s-parameter model
hybrid-p model
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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