Communication System (AIIMS Physics): Questions 10 - 12 of 12

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Question number: 10

» Communication System » Sky and Space Wave Propagation

MCQ▾

Question

For sky wave propagation of a 14 MHz signal, what should be the minimum electron density in ionosphere –

Choices

Choice (4) Response

a.

2.4×1012m3

b.

1014m3

c.

2.4×106m3

d.

1022m3

Question number: 11

» Communication System » Sky and Space Wave Propagation

MCQ▾

Question

In short wave communication waves of which of the following frequencies will be reflected back by the ionosphere layer having electron density 108 per m3?

Choices

Choice (4) Response

a.

9 KHz

b.

90 KHz

c.

45 KHz

d.

4.5 KHz

Question number: 12

» Communication System » Basic Elements of Communication System

MCQ▾

Question

If the T. V. telecast is to cover a radius of 130km , than the height of transmitting antenna is –

Choices

Choice (4) Response

a.

1300.7m

b.

1400m

c.

1320.3m

d.

1260.5m

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