Question 1

__________has a constant power spectral density.

Accepted Answer

A) white noise 
B) gaussian noise 
C) thermal noise 
D) shot noise 
A) white noise 
B) gaussian noise 
C) thermal noise 
D) shot noise A

Question 2

Link budget consists of calculation of

Accepted Answer

A) useful signal power 
B) interfering noise power 
C) useful signal & interfering noise power 
D) none of the mentioned 
A) useful signal power 
B) interfering noise power 
C) useful signal & interfering noise power 
D) none of the mentioned C

Question 3

What happens when the radiation resistance of the antenna matches the characteristic impedance of the transmission line?

Accepted Answer

A) no transmission occurs 
B) no reception occurs 
C) swr is maximum 
D) swr is minimum 
A) no transmission occurs 
B) no reception occurs 
C) swr is maximum 
D) swr is minimum D

Question 4

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

Accepted Answer

A) increases 
B) decreases 
C) remains constant 
D) remains unaffected 
A) increases 
B) decreases 
C) remains constant 
D) remains unaffected

Question 5

Antenna's efficiency is given by the ratio of

Accepted Answer

A) effective aperture to physical aperture 
B) physical aperture to effective aperture 
C) signal power to noise power 
D) losses 
A) effective aperture to physical aperture 
B) physical aperture to effective aperture 
C) signal power to noise power 
D) losses

Question 6

If the normalized load impedance of a transmission line is 2, then the reflection co- efficient is:

Accepted Answer

A) 0.33334 
B) 1.33334 
C) 0 
D) 1 
A) 0.33334 
B) 1.33334 
C) 0 
D) 1

Question 7

Mechanism contributing to a reduction in efficiency is called as

Accepted Answer

A) amplitude tapering 
B) blockage 
C) edge diffraction 
D) all of the mentioned 
A) amplitude tapering 
B) blockage 
C) edge diffraction 
D) all of the mentioned

Question 8

If the standing wave ratio for a transmission line is 1.4, then the reflection coefficient for the line is:

Accepted Answer

A) 0.16667 
B) 1.6667 
C) 0.01667 
D) 0.96 
A) 0.16667 
B) 1.6667 
C) 0.01667 
D) 0.96

Question 9

A rectangular horn antenna has an aperture area of 3? × 2?. If the aperture efficiency of an antenna is 90%, then the directivity of the antenna is:

Accepted Answer

A) 19 db 
B) 17.1 db 
C) 13 db 
D) 21.1 db 
A) 19 db 
B) 17.1 db 
C) 13 db 
D) 21.1 db

Question 10

Which is the primary cost for degradation of error performance?

Accepted Answer

A) loss in signal to noise ratio 
B) signal distortion 
C) signal distortion & loss in signal to noise ratio 
D) none of the mentioned 
A) loss in signal to noise ratio 
B) signal distortion 
C) signal distortion & loss in signal to noise ratio 
D) none of the mentioned

Question 11

The radiation pattern of a half-wave dipole has the shape of a __________

Accepted Answer

A) doughnut 
B) sphere 
C) hemisphere 
D) circular 
A) doughnut 
B) sphere 
C) hemisphere 
D) circular

Question 12

Antennas are used

Accepted Answer

A) as transducer 
B) to focus 
C) as transducer & to focus 
D) none of the mentioned 
A) as transducer 
B) to focus 
C) as transducer & to focus 
D) none of the mentioned

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

Space loss occurs due to a decrease in

Accepted Answer

A) electric field strength 
B) efficiency 
C) phase 
D) signal power 
A) electric field strength 
B) efficiency 
C) phase 
D) signal power

Question 15

A dipole antenna is also called as?

Accepted Answer

A) marconi antenna 
B) yagi antenna 
C) bidirectional antenna 
D) hertz antenna 
A) marconi antenna 
B) yagi antenna 
C) bidirectional antenna 
D) hertz antenna

Question 16

Slotted line is a transmission line configuration that allows the sampling of:

Accepted Answer

A) electric field amplitude of a standing wave on a terminated line 
B) magnetic field amplitude of a standing wave on a terminated line 
C) voltage used for excitation 
D) current that is generated by the source 
A) electric field amplitude of a standing wave on a terminated line 
B) magnetic field amplitude of a standing wave on a terminated line 
C) voltage used for excitation 
D) current that is generated by the source

Question 17

A rectangular horn antenna has an aperture area of 3? × 2?. Then the maximum directivity that can be achieved by this rectangular horn antenna is:

Accepted Answer

A) 24 db 
B) 4 db 
C) 19 db 
D) insufficient data 
A) 24 db 
B) 4 db 
C) 19 db 
D) insufficient data

Question 18

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

Accepted Answer

A) radtb + (1-rad) tp 
B) (1-rad) tp 
C) radtb 
D) none of the mentioned 
A) radtb + (1-rad) tp 
B) (1-rad) tp 
C) radtb 
D) none of the mentioned

Question 19

If the reflection coefficient of a transmission line is 0.4, then the standing wave ratio is:

Accepted Answer

A) 1.3333 
B) 2.3333 
C) 0.4 
D) 0.6 
A) 1.3333 
B) 2.3333 
C) 0.4 
D) 0.6

Question 20

The type of dipole antenna that has a higher band width is called as?

Accepted Answer

A) conical antenna 
B) yagi antenna 
C) helical antenna 
D) marconi antenna 
A) conical antenna 
B) yagi antenna 
C) helical antenna 
D) marconi antenna

__________has a constant power spectral density.

Link budget consists of calculation of

What happens when the radiation resistance of the antenna matches the characteristic impedance of the transmission line?

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

Antenna's efficiency is given by the ratio of

If the normalized load impedance of a transmission line is 2, then the reflection co- efficient is:

Mechanism contributing to a reduction in efficiency is called as

If the standing wave ratio for a transmission line is 1.4, then the reflection coefficient for the line is:

A rectangular horn antenna has an aperture area of 3? × 2?. If the aperture efficiency of an antenna is 90%, then the directivity of the antenna is:

Which is the primary cost for degradation of error performance?

The radiation pattern of a half-wave dipole has the shape of a __________

Antennas are used

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

Space loss occurs due to a decrease in

A dipole antenna is also called as?

Slotted line is a transmission line configuration that allows the sampling of:

A rectangular horn antenna has an aperture area of 3? × 2?. Then the maximum directivity that can be achieved by this rectangular horn antenna is:

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

If the reflection coefficient of a transmission line is 0.4, then the standing wave ratio is:

The type of dipole antenna that has a higher band width is called as?

Antennas and Frequency Multipliers

Antenna Fundamentals and Characteristics

Antenna Arrays, Power Amplifiers, and Gunn Diodes

Microwave Devices and Their Operation: Gunn Diodes, Impatt Diodes, Klystron Tubes

RF Devices and Circuits

Microwave Network Noise Figure, Oscillator Circuits, and Negative Resistance Devices

Filters

Exam 2: Antenna and Transmission Line

__________has a constant power spectral density.

Link budget consists of calculation of

What happens when the radiation resistance of the antenna matches the characteristic impedance of the transmission line?

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

Antenna's efficiency is given by the ratio of

If the normalized load impedance of a transmission line is 2, then the reflection co- efficient is:

Mechanism contributing to a reduction in efficiency is called as

If the standing wave ratio for a transmission line is 1.4, then the reflection coefficient for the line is:

A rectangular horn antenna has an aperture area of 3? × 2?. If the aperture efficiency of an antenna is 90%, then the directivity of the antenna is:

Which is the primary cost for degradation of error performance?

The radiation pattern of a half-wave dipole has the shape of a __________

Antennas are used

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

Space loss occurs due to a decrease in

A dipole antenna is also called as?

Slotted line is a transmission line configuration that allows the sampling of:

A rectangular horn antenna has an aperture area of 3? × 2?. Then the maximum directivity that can be achieved by this rectangular horn antenna is:

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

If the reflection coefficient of a transmission line is 0.4, then the standing wave ratio is:

The type of dipole antenna that has a higher band width is called as?

Antennas and Frequency Multipliers

Antenna Fundamentals and Characteristics

Antenna Arrays, Power Amplifiers, and Gunn Diodes

Microwave Devices and Their Operation: Gunn Diodes, Impatt Diodes, Klystron Tubes

RF Devices and Circuits

Microwave Network Noise Figure, Oscillator Circuits, and Negative Resistance Devices

Filters