Communications Question Bank

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1. The maximum distance  upto which TV transmission from a TV tower of height h can be received is proportional to
A.
B.
C.
D.
2. In the communication systems, AM is used for broadcasting  because
A.
B.
C.
D.
3. The waves relevant to telecommunications are
A.
B.
C.
D.
E.
4. The relation between the maximum electron density N_{max} and the critical frequency f_{c} for the ionosphere can be given as
A.
B.
C.
D.
5. What should be the maximum acceptance angle at the air core interface of an optical fibre if n_{1} and n_{2} are the refractive indices of the core and the cladding, respectively
A.
B.
C.
D.
6. In Statellite communication

1 . the frequency used  lies between 5\,MHz and 10\,MHz

2 . The uplink and downlink frequencies are different.

3 . The orbit of geostationary satellite lies in the equatorial plane at an inclination of 0^{o}.

In the above statements
A.
B.
C.
D.
E.
7. Which of the following statement is wrong ?
A.
B.
C.
D.
E.
8. For sky wave propagation of 10MHz signal, what should be the minimum electron density in ionosphere?
A.
B.
C.
D.
9. A laser beam is used from locating distant object because
A.
B.
C.
D.
10. A broken ligament is being ‘welded’ back in place using 20ms pulses from a 0.5 W laser operating at a wavelength of 632nm. The number of photons in 5 pulses of laser are
A.
B.
C.
D.