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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Q. Radar reciever has high sensitivity and low noise figure

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Q. For a waveguide, which of the following statements is wrong?

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Q. A circular waveguide has an infinite set of TE and TM modes.

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Q. In TE and TM modes of rectangular waveguides having propagation in z direction

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Q. The manufacturing technique used to manufacture strip type transmission line is

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Q. An electromagnetic wave can be completely guided by a dielectric rod or slab.

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Q. A transmission line discontinuity is defined as any interruption in the uniformity of the line.

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Q. Interference generated by electrical equipment and automobile ignition systems when observed closed to earth is

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Q. The earliest uses of electromagnetic waves were

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