# Microwave Engineering MCQ Questions & Answers

Microwave Engineering MCQs : This section focuses on the "Microwave Engineering". These Multiple Choice Questions (MCQs) should be practiced to improve the Microwave Engineering skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

Gain of an antenna is always greater than the directivity of the antenna.

A. True
B. False

Question 2

If an antenna has a directivity of 16 and radiation efficiency of 0.9, then the gain of the antenna is:

A. 16.2
B. 14.8
C. 12.5
D. 19.3

Question 3

_________ antennas consist of a regular arrangement of antenna elements with a feed network

A. Aperture antennas
B. Array antennas
C. Printed antennas
D. Wire antennas

Question 4

Dipole antennas are an example for:

A. Wire antennas
B. Aperture antennas
C. Array antennas
D. None of the mentioned

Question 5

Antennas are bidirectional devices.

A. True
B. False

Question 6

If the beam width of an antenna in two orthogonal planes are 300 and 600. Then the directivity of the antenna is:

A. 24
B. 18
C. 36
D. 12

Question 7

Normalized impedance of 0.3+j0.4 lies in the:

A. Upper half of the impedance smith chart
B. Lower half of the impedance smith chart
C. Horizontal line of the chart
D. None of the above

Question 8

Beamwidth and directivity are both measures of the focusing ability of an antenna.

A. True
B. False

Question 9

The noise temperature of an antenna is given by the expression:

D. None of the above

Question 10

Antennas having a constant pattern in the azimuthal plane are called _____________

A. High gain antenna
B. Omni directional antenna
C. Unidirectional antenna
D. Low gain antenna

Question 11

Low is the G/T ratio of an antenna, higher is its efficiency.

A. True
B. False

Question 12

Smith chart is based on the polar plot of:

A. Reactance
B. Voltage
C. Current
D. Voltage reflection co-efficient

Question 13

_________ has a constant power spectral density.

A. White noise
B. Gaussian noise
C. Thermal noise
D. Shot noise

Question 14

With an increase in operating frequency, the background noise temperature:

A. Increases
B. Decreases
C. Remains constant
D. Remains unaffected

Question 15

_________ of an antenna is a plot of the magnitude of the far field strength versus position around the antenna.

B. Directivity
C. Beam width
D. None of the mentioned