Some types of traps used in video IF amplifier of colour TV are shunt traps seri

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Question
Some types of traps used in video IF amplifier of colour TV are
Options
A. shunt traps
B. series traps
C. absorption traps
D. all of the above

Correct Answer

all of the above

Explanation

All these are used.

Communication Systems problems

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1. Signal to noise ratio of microphone is defined as the ratio of output when the sound pressure is __________ to the output in the absence of any sound signal.
Options
A. 0.5 Pa
B. 0.2 Pa
C. 0.1 Pa
D. 0.01 Pa

2. A cordless telephone using separate frequencies for transmission in base and portable units is known as
Options
A. duplex arrangement
B. half duplex arrangement
C. either (a) or (b)
D. neither (a) nor (b)

3. In CCIR-B system, the time between start of one H syn. pulse and next is
Options
A. 64 ?s
B. 6.4 ?s
C. 640 ?s
D. 0.64 ?s

4. An earth mat for a communication tower consists of
Options
A. one or two radials extending from base of tower at a depth of about 5 cm below ground
B. a large number of radials extending from base of tower at a depth of about 3 m
C. a large number of radials extending from base of tower at a depth of about 30 cm
D. none of the above

6. Consider the following statements
1. The amplitude of an FM wave is constant
2. FM is more immune to noise than AM
3. FM broadcasts operate in upper VHF and UHF frequency ranges
4. FM transmitting and receiving equipments are simpler as compared to AM transmitting and receiving equipments
Which of the above are correct?
Options
A. 1, 2, 3, 4
B. 1, 2, 3
C. 2, 3, 4
D. 1, 3, 4

7. The colour subcarrier and sidebands produced by its modulation with the chrominance signals are accommodated in the standard channel width by the process of
Options
A. frequency adjustment
B. frequency interleaving
C. frequency changing
D. frequency amalgamation

8. As the frequency increases, the absorption of ground wave by earth's surface
Options
A. decreases
B. increases
C. remains the same
D. either (a) or (c)

9. The velocity of sound waves in air
Options
A. is constant at all temperatures
B. varies directly as temperature
C. varies inversely as absolute temperature
D. varies directly as square root of absolute temperature

10. Counterpoise is used in coils having
Options
A. high resistivity
B. low resistivity
C. medium resistivity
D. both (b) and (c)

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