Faculty of Computer Science & Engineering Chapter 02. Radio

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FACULTY OF
COMPUTER SCIENCE &
ENGINEERING
Chapter 02. Radio
Frequency
QUESTION 1

1. When visual line of sight (LOS) is present, RF
LOS will always be present.

A. This statement is always true

B. This statement is always false

C. It depends on the configuration of the antennas
QUESTION 2

2. When RF LOS is present, visual LOS will
always be present.

A. This statement is always true

B. This statement is always false

C. It depends on the specific factors
QUESTION 3

3. What unit of measurement is used to quantify
the power gain or loss of an RF signal? Choose all
that apply.

A. dBi

B. dBm

C. Watts

D. dB
QUESTION 4

4. Using which of the following will reduce VSWR?
Choose all that apply.

A. Cables and connectors that all have an impedance of 50
Ohms

B. Cables with a 50 Ohm impedance and connectors with
75 Ohm impedance

C. Cables and connectors that all have an impedance of 75
Ohms

D. Cables with 75 Ohm impedance and connectors with 50
Ohm impedance
QUESTION 5

5. In an RF circuit, what is the intentional
radiator defined as?

A. The output of the transmitting device

B. The output of the last connector before the signal
enters the antenna

C. The output as measured at the antenna element

D. The output after the first length of cable attached
to the transmitting device
QUESTION 6

6. dBi is a relative measurement of decibels to
which one of the following?

A. Internet

B. Intentional radiator

C. Isotropic radiator

D. Isotropic radio
QUESTION 7

7. Which one of the following is considered
impedance in an RF circuit?

A. The inability to transmit RF signals

B. Interference of an RF signal during foul weather

C. Resistance to current flow, measured in Ohms

D. The frequency on which an RF transmitter sends
signals
QUESTION 8

8. In RF mathematics, 1 watt equals what
measurement of dBm?

A. 1

B. 3

C. 10

D. 30

E. 100
QUESTION 9

9. Which one of the following RF behaviors is
defined as “the bending of a wave as it passes
through a medium of different density”?

A. Diffraction

B. Reflection

C. Refraction

D. Distraction
QUESTION 10

10. Given an access point with 100 mW of output
power connected through a 50-foot cable with 3
dB of loss to an antenna with 10 dBi of gain,
what is the EIRP at the antenna in mW?

A. 100 mW

B. 250 mW

C. 500 mW

D. 1 W
QUESTION 11

11. Given a wireless bridge with 200 mW of
output power connected through a 100 foot cable
with 6 dB of loss to an antenna with 9 dBi of
gain, what is the EIRP at the antenna in dBm?

A. 20 dBm

B. 26 dBm

C. 30 dBm

D. 36 dBm
QUESTION 12

12. Given an access point with an output power of
100 mW connected through a cable with a loss of
2 dB to antenna with a gain of 11 dBi, what is the
EIRP in mW?

A. 200 mW

B. 400 mW

C. 800 mW

D. 1 W
QUESTION 13

13. Given an access point with an output power of
20 dBm connected through a cable with a loss of
6 dB to an amplifier with a 10 dB gain, then
through a cable with 3 dB of loss to an antenna
with 6 dBi of gain, what is the EIRP in dBm?

A. 18 dBm

B. 23 dBm

C. 25 dBm

D. 27 dBm
QUESTION 14

14. What is the net gain or loss of a circuit if it is
using two cables with 3 dB loss each, one
amplifier with a 12 dB gain, 1 antenna with 9 dBi
gain, and an attenuator with a loss of 5 dB?

A. 5 dB

B. 10 dB

C. 15 dB
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D. 20 dB
QUESTION 15

15. Which of the following is a cause of VSWR?

A. Mismatched impedances between wireless LAN
connectors

B. Too much power being radiated from the antenna
element

C. The incorrect type of antenna used to transmit a
signal

D. Use of the incorrect RF frequency band
QUESTION 16

16. Radio waves propagate (move) away from the
source (the antenna) in what manner?

A. In a straight line in all directions at once within
the vertical and horizontal beamwidths

B. In circles spiraling away from the antenna

C. In spherical, concentric circles within the
horizontal beamwidth

D. Up and down across the area of coverage
QUESTION 17

17. Why is the Fresnel Zone important to the integrity of
the RF link?

A. The Fresnel Zone defines the area of coverage in a typical
RF coverage cell

B. The Fresnel Zone must always be 100% clear of any and all
blockage for a

wireless LAN to operate properly

C. The Fresnel Zone defines an area around the LOS that can
introduce RF signal

interference if blocked

D. The Fresnel Zone does not change with the length of the RF
link
QUESTION 18

18. The FCC allows how many watts of power to
be radiated from an antenna in a point to
multipoint wireless LAN connection using
unlicensed 2.4 GHz spread spectrum equipment?

A. 1 watt

B. 2 watts

C. 3 watts

D. 4 watts
QUESTION 19

19. In regards to gain and loss measurements in
wireless LANs, the statement that gains and
losses are additive is:

A. Always true

B. Always false

C. Sometimes true

D. Sometimes false

E. It depends on the equipment manufacturer
The
END

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