Q. SWR for a transmission line is infinity when the load is

1. Short circuit
2. Complex impedance
3. Open circuit
4. Pure reactance

Of the above statements:

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Q. The discone antenna is

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Q. The direction of pick up in a CD is

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Q. A (75 - j 50) Ω load is connected to a coaxial line of Z0 = 75 Ω at 10 GHz. The best method of matching consists of using

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Q. Consider the following test signal patterns

1. Ramp
2. Grill
3. Grey shades
4. Sine pulse
5. Picture line up generating equipment

Which of the above are used in TV studios?

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Q. If aspect ratio is 4/3 and number of lines in each frame is 625, the number of picture elements in one frame is

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Q. Indicate the false statement: If SWR on a transmission line is infinite, the line is terminated in

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Q. In TV signals colour burst is used

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Q. The resonant frequency of an RF amplifier is 1 MHz and its bandwidth is 10 kHz. The Q factor will be

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Q. Two sinusoidal signals of same amplitude and frequencies 10 kHz and 10.1 kHz are added together. The combined signal is given to an ideal frequency detector. The output of the detector is

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Q. In Vidicon camera tube, the resistance of photoconductive material on the target plate

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Q. Which of the following are useful in comparing the noise performance of receivers?

1. Input noise voltage
2. Noise figure
3. Noise resistance
4. Noise temperature

Select answer as per the following codes:

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Q. Push pull amplifier is

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Q. The tape recorders used in homes have

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Q. In a communication system, noise is most likely to affect the signal

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Q. Each frequency in the modulating wave gives rise to four side bands.

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Q. Assertion (A): CCIR-B system has 625 scanning lines per frame and 2 : 1 interlace.

Reason (R): The aspect ratio is 4 : 3

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Q. At night the ionosphere can be considered to be consisting of

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Q. A balun transformer gives an impedance transformation of

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Q. Which one of the following is true?

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