Communication System Test

Result

Communication System Test - 12

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Weekly Quiz Competition

Question 1
4 / -1

Statement-1 :- sky wave communication is not suitable for frequencies greater than 30 MHz.
Statement-2 :- High frequency signals die out before reaching the ionosphere.
(a) Statement-1 is true, statement-2 is true. Statement-2 is a correct explanation for statement-1.
(b) Statement-1 is true, statement-2 is true, statement-2 is not a correct explanation for statement-1.
(c) Statement-1 is true, statement-2 is false
(d) Statement-1 is false, statement-2 is true.

A
a

B
b

C
c

D
d
Question 2
4 / -1

Statement-1 :- Modulated wave is received directly on a head phone
Statement-2 :- High frequency waves are beyond audible range.
(a) Statement-1 is true, statement-2 is true. Statement-2 is a correct explanation for statement-1.
(b) Statement-1 is true, statement-2 is true, statement-2 is not a correct explanation for statement-1.
(c) Statement-1 is true, statement-2 is false
(d) Statement-1 is false, statement-2 is true.

A
a

B
b

C
c

D
d
Question 3
4 / -1

The refractive inden of the ionosphere

A
Increase as we go from the lower to upper layer of the ionosphere

B
Decrease as we go from the lower to upper layer of the ionosphere

C
Remain the same through out the ionosphere

D
Is equal to unity
Question 4
4 / -1

A
16 km

B
32 km

C
80 km

D
160 km
Question 5
4 / -1

A receiving station on the ground is receiving a signal of frequency 10 MHz, then the mode of transmission is

A
Ground wave propagation

B
Sky wave propagation

C
Both ground wave and sky wave propagation

D
Neither ground wave nor sky wave propagation
Question 6
4 / -1

On a particular day, the maximum frequency reflected from the ionosphere is 8 MHz. On another day it was found to increase to 9 MHz. The ratio of the minimum electron densities of ionosphere on the two days is

A

B

C

D
Question 7
4 / -1

Consider an optical communication system operating at λ = 800 nm. Suppose only 1% of the optical source frequency is the available channel bandwidth for optical communication. No. of channels that can be accomodated for transmitting video T.V signals requiring an approximate band width of 4.5 MHz is __________

A

B

C

D
Question 8
4 / -1

A
25%

B
0.25%

C
400%

D
40%
Question 9
4 / -1

A transmitting antenna at the top of a tower has a height of 50m and the height of the receiving antenna is 32m. The maximum distance between them for satisfactory communication in line of right mode is___________ Given radius of earth R = 6400 km

A

B

C
45.5 km

D
None of these
Question 10
4 / -1

The characteristic impedance of a co-axial cable is between ______________

A
10 Ω to 20 Ω

B
20 Ω to 30 Ω

C
30 Ω to 60 Ω

D
50 Ω to 70 Ω