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

View solution

Q. The earliest uses of electromagnetic waves were

View solution

Q. At millimeter wavelength the favoured mode in circular wave guide is

View solution

Q. In laboratory experiment the output from reflex klystron is moderated by square wave because

View solution

Q. In microwave detector used in laboratory measurements of relative power levels, standing wave ratio is about

View solution

Q. Microwaves

View solution

Q. In microstrip line has dielectric material most commonly used is

View solution

Q. In fibre optics the use is made of thin glass fibres for efficient transmission of light.

View solution

Q. Fields are said to be circularly polarized if

View solution

Q. Most electromagnetic transmission in rectangular wave-guide uses

View solution

Q. Loading of a line means

View solution

Q. The frequency of oscillations obtained from a reflex klystron depends mainly on

View solution

Q. The main advantage of TWT over klystron is

View solution

Q. In a TWT the phase velocity of the axial component of the field on the slow wave structure is kept

View solution

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