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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 22
1.
The minimum energy of a photon required for intrinsic excitation is equal to
energy of bottom of conduction band
energy of top of valence band
forbidden gap energy
Fermi energy
Answer: Option
Explanation:
No answer description is available. Let's discuss.
2.
The circuits with active pull up are preferred because of their stability for
wired - AND operation
wired - OR operation
bus operated system
reasonable dissipation and speed of operation
Answer: Option
Explanation:
No answer description is available. Let's discuss.
3.
A scheme shown below is to generate a wide band FM modulate signal.

Narrow band FM has carrier frequency = 400 KHz
Deviation ratio = 0.2
Wide band FM has carrier frequency = 100 MHz
Deviation ratio = 6
Local oscillator frequencies can be
88 MHz, 112 MHz
96 MHz, 104 MHz
92 MHz, 108 MHz
90 MHz, 110 MHz
Answer: Option
Explanation:
No answer description is available. Let's discuss.
4.
How many maximum number of functions can be defined with two symbols which are Boolean in nature:
4
8
2
16
Answer: Option
Explanation:
No answer description is available. Let's discuss.
5.
The characteristic equation of a control system is given as s4 + 4s3 + 4s2 + 3s + K = 0.
What is the value of K for which this system is marginally stable?
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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