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61.

Which one of the following is caused by reflection from stratified atmosphere or from the surface or land conditions along the path?
a. Multipart fading
b. Selective fading
c. Duo fading
d. Reflection fading

asked in Electronics Paper-2, 1997

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62.

Consider the following statements:
Losses in optical firbres are caused by
1. Impurities in the fibre material
2. Micro bending
3. splicing
4. step index profile
Of these statements
a. 1,3 and 4 are correct
b. 2,3 and 4 are correct
c. 1,2 and 3 are correct
d. 1,2 and 4 are correct

asked in Electronics Paper-2, 1997

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63.

In satellite communication, highly directional antennas are used to
a. Direct the spot beam to a particular region of space on Earth
b. Strengthen the beam to overcome the cosmic noise
c. Make corrections in change of polarization of the beam
d. Select particular channel in transmission and reception

asked in Electronics Paper-2, 1997

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64.

Preset equalization follows the same processes as adaptive equalization except that the equalization is set prior to transmission and then updated during breaks in transmission using
a. Special test sequences
b. Block codes
c. BCD
d. Correlators

asked in Electronics Paper-2, 1997

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65.

For reliable “beyoad-the-horizon” microwave communication, with out using repeaters, the frequency of choice would be:
a. 1MHz
b. 30MHz
c. 2000 MHz
d. 30,000 MHz

asked in Electronics Paper-2, 1997

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66.

Two carriers 40 MHz and 80 MHz respectively are frequency, modulated by a signal of frequency 4 Khz, such that the bandwidths of the FM signal in the two cases are the same. The peak deviation in the two cases are in the ratio of
a. 1:4
b. 1:2
c. 1:1
d. 2:1

asked in Electronics Paper-2, 1997

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