Q. The π mode of operation of magnetron signifies that

View solution

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?

View solution

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

View solution

Q. If a microstrip is enclosed in a metal enclosure

View solution

Q. Which of the following is a balanced line?

View solution

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

View solution

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

View solution

Q. Wave guides are pressurised above normal atmospheric pressure for

View solution

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

View solution

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

View solution

Q. In a TWT the loss in attenuator is

View solution

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

View solution

Q. Radar reciever has high sensitivity and low noise figure

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution