1. Microwave links are preferred for TV transmission because ?

they produce less phase distortion

easy to transmit

there is small S/N ratio

there is no impulse noise

Answer: easy to transmit


2. Microwave frequencies are used for communication with deep space probes primarily because they do not suffer ?

attenuation in space


velocity distortion and phase distortion

refraction by ionosphere

Answer: refraction by ionosphere


3. Microwave links are generally transmission because preferred to coaxial cable for TV ?

they are cheaper

of their greater bandwidth

of their relative immunity to impulse noise

they have less overall phase distortion

Answer: they are cheaper


4. The main difference between the operation of transmission lines and waveguides is that ?

terms such as impedance notching and standing wave ratio cannot be applied to waveguides

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

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

the latter are not distributed like transmission lines

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


5. A rectangular waveguide supports ?


only TM

TE and TM

only TE

Answer: TE and TM


6. The ratio of the transverse electric field to the transverse magnetic field is called as ?

Poynting vector

phase velocity

waveguide impedance

waveguide wavelength

Answer: waveguide impedance


7. A waveguide section in a microwave circuit will act as a ?

high-pass filter

band-stop filter

band-pass filter

low-pass filter

Answer: high-pass filter


8. In a rectangular wave guide, the phase velocity ?

is constant

decreases with increasing frequency

is independent of frequency

increases with increasing frequency

Answer: increases with increasing frequency


9. A waveguide operated below cut-off frequency can be used ?

an attenuator

an isolator

a phase shifter

None of the above

Answer: an attenuator


10. The dominant mode in a waveguide is characterized by ?

infinite attenuation

zero attenuation

short cut-off wavelength

longest cut-off wavelength

Answer: short cut-off wavelength