Q. Assertion (A): Two equal and opposite travelling waves result in a standing wave.

Reason (R): The ratio of maximum to minimum value of a standing wave is called SWR.

View solution

Q. When a wave reaches an open circuit

View solution

Q. Assertion (A): In circular waveguide the attenuation of TE01 mode decreases as the operating frequency increases.

Reason (R): The wall currents in a circular waveguide in TEQ1 mode are completely circumferential.

View solution

Q. Consider the following statements

1. Usable bandwidth of ridge wave guide is more than that of rectangular waveguide.
2. For a given value of TM₁₀ cutoff frequency the cross section of ridge wave guide is lesser that that of rect angular waveguide.
3. Ridge wave guide has higher conductor losser than a rectangular waveguide.
4. Ridge guide has higher conductor losser than a rectangular waveguide.

Which of the above statements are correct?

View solution

Q. Directive gain of elementary doublet is

View solution

Q. A directional coupler is used

View solution

Q. Assertion (A): In rectangular waveguide TE₀₁ mode is just TE₁₀ mode rotated by 90°.

Reason (R): When a rectangular waveguide is rotated by 90°, the broad and narrow dimensions get interchanged.

View solution

Q. Consider the following statements about a magic tee

1. The collinear arms are isolated from each other.
2. On of the collinear arms is isolated from E arm.
3. On of the collinear arms is isolated from H arm.
4. E and H arms are isolated from each other.

Of the above statements

View solution

Q. Assertion (A): Hollow waveguides are frequently used as transmission lines at microwave frequencies.

Reason (R): Waveguide has high power handling capacity, low loss and simple structure.

View solution

Q. In π mode of operation of magnetron the spikes due to phase focussing effect rotate at an angular velocity corresponding to

View solution

Q. In rectangular waveguides the ratio of width to height is about

View solution

Q. Which of these statements is correct?

View solution

Q. A rectangular waveguide has width a. Then at the cutoff frequency (with corresponding wave length λc)

View solution

Q. Ridge waveguide is essentially a form of capacitively loaded guide.

View solution

Q. In a rectangular waveguide

View solution

Q. Which of the following modes cannot exist in rectangular resonant cavity?

View solution

Q. In a Gunn diode oscillator drift velocity of electron is 10⁷ cm/s and active region length is 10 x 10‾⁴ cm. The natural frequency of oscillation is

View solution

Q. Assertion (A): An artificial transmission line can be used as a pulse generator.

Reason (R): A pulse function is used very frequently in network analysis.

View solution

Q. Consider the following statements about hybrid ring

1. Ports 1 and 2 are decoupled.
2. Port 3 and 4 are coupled.
3. A signal entering either port 1 or 2 splits equally between ports 3 and 4.
4. A signal entering either port 3 or 4 splits equally between ports 1 and 2.

Which of the above are correct?

View solution

Q. TM₀₁ mode in circular waveguide is analogous to

View solution