Microwave Engineering MCQ Questions Answers Electronics ECE

11) The type of antenna to be used for producing circularly polarized beams is

a) pyramidal horn

b) log-periodic array

c) paraboloid

d) helical antenna

View Answer
Option – d)

12) In LOS-line of sight propagation systems, to take account of normal refraction, an effective earth radius factor k is used whose value is

a) 4/3

b) 4

c) ¾

d) ½

View Answer
Option – a)

13) Which is the most common antenna to obtain a predetermined radiation pattern ?

a) Array antenna

b) Corner reflector

c) Sectoral horn

d) Helical antenna

View Answer
Option – a)

14) Why is an attenuator used in a TWT ?

a) To help bunching

b) To prevent oscillations

c) To prevent saturation

d) To increase gain

View Answer
Option – b)

15) For a parabolic reflector of 5 meter diameter, the far field pattern measurement at 6 GHz should be carried out a distance of at least

a) o.5 km

b) 1.0 km

c) 1.5 km

d) 2.0 km

View Answer
Option – b)

16) Which of the following are microwave sources ?

a) klystron

b) Magnetron



View Answer
Option – b)

17) X-band frequencies are in which one of the following ranges?

a) 3.5 to 5.5 GHz

b) 5.5 to 8.0 GHz

c) 8.0 to 12.0 GHz

d) 12.4 to 16.4 GHz

View Answer
Option – c)

18) In microwave communication links, what causes intense fading in the 18GHz band ?

a) Snow

b) Rain

c) Fog

d) Dust

View Answer
Option – b)

19) A amplifier has  a  power gain of 200. What is its gain in dB? (log10 2 = 0.30)

a) 14 dB

b) 17 dB

c) 20 dB

d) 23 dB

View Answer
Option – d)

20) Which of the following modes can exist in a rectangular wave guide ?

a) TM10

b) TE10

c) TM00

d) TM01

View Answer
Option – b)

21) Which one of the following is a transferred electron device ?

a) BARITT diode
b) IMPATT diode

c) TRAPATT diode

d) Gunn DIODE

View Answer
Option – d)

22) Which of the following is a circularly polarized antenna ?

a) Horn

b) Dipole

c) Helical

d) Pyramidal

View Answer
Option – c)

23) The main disadvantage of using coaxial cable for microwave signals is its

a) Low selectivity

b) Low distortion

c) High attenuation

d) High sensitivity

View Answer
Option – c)

24) Which is the dominant mode in rectangular waveguides ?

a) TE10

b) TE11

c) TM01

d) TM11

View Answer
Option – a)

25) A Gunn diode is a negative resistance device, which is used as source of microwaves. What is the number of p-n junctions ?

a) 1

b) 2

c) 3

d) 0

View Answer
Option – d)

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