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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 20
21.
A heavily doped semiconductor exhibits a __________ such a device is called sensistors.
negative temperature coefficient of resistance
positive temperature coefficient of resistance till a particular value of temperature and then it shown negative temperature coefficient of resistance
positive temperature coefficient of resistance
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
Sampling frequency of
sin 100pt + cos 200pt + sin 100pt + cos 200pt is:
100 Hz
200 Hz
400 Hz
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
For real and odd signals, the Fourier series coefficient ak is __________ .
purely imaginary and even
purely real and even
purely imaginary and odd
purely real and odd
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
The magnitude of frequency response of an underdamped second order system is 5 at 0 rad/sec and peaks to at 52rad/sec. The transfer function of the system is
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
Who developed the concept of time varying electric field producing a magnetic field?
Gauss
Faraday
Hertz
Maxwell
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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