Q. Which of the following modes in circular waveguides are circularly symmetric?

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Q. Which of the following lines behaves as infinite line?

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Q. A rectangular waveguide has two stubs each length λ/4 connected at the source end. The stubs are short circuted. Then

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Q. Performance of a PIN diode switch is represented by

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Q. As frequency is increased, the skin effect

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Q. In a rectangular waveguide there is one half wave variation of electric field across the narrow dimension and two half wave variations of electric field across wider dimension. The dominant mode is

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Q. VTM stands for voltage tunable magnetron.

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Q. Which of the following is used in integrated circuits?

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Q. The π mode of operation of magnetron signifies that

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Q. Consider the following statements (L is the length of array between centres of end antennas and A is wave-length)

1. Width of major lobe between nulls of broad side array and end fire array are different.
2. Directive gain of broadside array and end fire array are different.
3. Directive gain of broadside array is 4(L/λ) .

Which of the above statements are correct?

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Q. The electrical requirement on wall thickness of rectangular wave guide is

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Q. If a microstrip is enclosed in a metal enclosure

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Q. Which of the following is a balanced line?

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Q. A line of characteristic impedance 400 Ω is terminated by a resistance of 400 Ω. The reflected quantities are

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Q. A magic tee is to be used as CW duplexer. Then port 1, port 2, port 3 (E arm), port 4 (H arm) respectively should be connected to

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Q. Wave guides are pressurised above normal atmospheric pressure for

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Q. Assertion (A): In a power divider SH = 0, S21 = 0.707 = S3.

Reason (R): In a power divider the input port (i.e., port 1) is matched and incident power is equally divided in output ports 2 and 3

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Q. Which mode is called dominant mode in rectangular wave guide?

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Q. In a TWT the loss in attenuator is

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Q. To study electromagnetic radiations from astronomical objects, radio astronomers use

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