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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 23
26.
Which of the following microphones has lowest output impedance?
Moving coil
Ribbon
Crystal
Condenser
Answer: Option
Explanation:
No answer description is available. Let's discuss.
27.
High frequency waves are
absorbed by F2 layer
affected by solar cycle
reflected by D layer
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
28.
During fast forward operation of a tape recorder
all heads are withdrawn
all amplifiers are shut off
tape is not pressed against capstan
all of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
29.
Homodyne detection means
coherent detection
non-coherent detection
asynchronous detection
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
30.
A radio station works at 800 kHz and uses AM. If this is a public broadcast system, it should transmit using
parabolic reflector to transmit all round
turnstile antenna for the required land
half wave long horizontal wave
a vertical antenna less than quarter for practical reasons
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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