Transmission Lines and Waveguides MCQs

Question 1

The wavelength of a wave in a waveguide is greater than in free space

Accepted Answer

is inversely proportional to the phase velocity

Answer

depends on the wavelength dimensions and the free space wavelength

Answer

is directly proportional to the group velocity

Question 2

The main difference between the operation of transmission lines and waveguide is that

Accepted Answer

the former can use stubs and quarter wave transformers, unlike the latter

Answer

the latter are not distributed like transmission lines

Answer

transmission lines use the principle mode of propagation, and therefore do not suffer from low frequency cut-off

Answer

terms such as stub matching standing wave ratio cannot be applied to wave guides

Question 3

The dominant mode of propagation is preferred with rectangular waveguides because (indicate false statement)

Accepted Answer

propagation of it without any spurious generation can be ensured

Answer

it leads to the smallest waveguide dimensions

Answer

the resulting impedance can be matched directly to coaxial lines

Answer

it is easier to excite than the other modes

Question 4

A signal propagated in a waveguide hasa full wave of electric intensity change between the two further walls, and no component of the electric field in the direction of propagation, The mode is

Accepted Answer

TM2,2

Answer

TE 1, t

Answer

TE"

Answer

TE2,2

Question 5

Propagation constant of a line is

Accepted Answer

y = 4(R + koL) (G + jwC)

Answer

Y = (R jo)L) (G + jco

Answer

(R + jo.)L)

Answer

none of these

Question 6

On a transmission line with standing waves, the distance between a voltage maximum and adjacent current maximum is

Accepted Answer

ia2

Answer

V8

Answer

V4

Answer

none of the above

Question 7

Matching stub should be

Accepted Answer

nearest to load

Answer

nearest to transmitter

Answer

midway between load and transmitter

Answer

on transmitter

Question 8

For transmission-line load matching over a range of frequencies, it is best to use

Accepted Answer

broad band directional coupler

Answer

balun

Answer

double stub

Answer

single stub of adjustable position.

Question 9

The velocity factor of a transmission line

Accepted Answer

Depends on the dielectric constant of the material used

Answer

Increases the velocity along the transmission line

Answer

Is governed by the skin effect

Answer

Is higher for a solid dielectric than for