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Practice for Chapter1,2,3- Wireless Communication/Adhoc

Total questions: 20

Worksheet time: 20mins

Name
Class
Date
1.

Which is the last component in the creation of the wireless medium?

a)

Receiver

b)

Transmitter

c)

Antenna

d)

radio waves

2.

Which is the component that do passive gain of the wireless medium?

a)

Receiver

b)

Transmitter

c)

Antenna

d)

radio waves

3.

Which is the component that do active gain and is the starting of the wireless medium?

a)

Receiver

b)

Transmitter

c)

Antenna

d)

radio waves

4.

How will be the Electrical (E) field of radio waves aligned if the antenna is vertically polarized ?

a)

E field will be parallel(same alignment) to the earth

b)

E field will be perpendicular(90 degrees) to the earth

c)

E field will be not aligned to the earth

d)

No E-field at all

5.

Which field of radio waves will be aligned for antenna polarizion ?

a)

E field

b)

M Field

c)

earth gravity

d)

North pole

6.

If a wireless signal is having the Electrical-field parallel

to the earth, which type of antenna you will purchase?

a)

Horizontal polarized antenna

b)

Vertical polarized antenna

c)

Any antenna

d)

No need for antenna

7.

When multiple RF signals arrive at the receiver at the same time and are in phase or partially out of phase with the primary wave, what can be the result?

a)

can be an increase or gain in amplitude

b)

can have decrease or attenuation in amplitude

c)

No change in amplitude

d)

No effect in amplitude

8.

During multipath if RF signals arrive at the receiver at the same time and are completely out of phase with the primary wave, what can be the result?

a)

can be an increase or gain in amplitude

b)

can have decrease or attenuation in amplitude

c)

No change in amplitude

d)

No effect in amplitude

9.

Which device operate at the lowest power?

a)

WiFi 802.11 devices

b)

Commercial radio stations

c)

Commercial TV stations

d)

Licensed walkie talkie broadcasts

10.

Unit of loss of signal is usually measured in?

a)

dB

b)

Watt

c)

Voltage

d)

Ampere

11.

Unit of power of signal is usually measured in?

a)

dB

b)

Watt

c)

Voltage

d)

Ampere

12.

Which is the property called as multiple reflection?

a)

Scattering

b)

Reflection

c)

Refraction

d)

Diffraction

13.

Which are the organizations that manage the radio spectrum frequencies in Oman?

a)

FCC

b)

ISO

c)

TRA

d)

Omantel

14.

Which is a theoretical reference antenna that radiates energy equally in all direction?

a)

Isotropic antenna

b)

Directional antenna

c)

Multipartite antenna

d)

Hertzian dipole

15.

Which is the process of adding the data to a carrier signal to form the modulated waveform?

a)

Encoding

b)

Decoding

c)

Demodulation

d)

Waveform

16.

What is the name of the chipping code that is used to achieve rates of 2 Mbps, and uses 11 chips when encoding the data?

a)

Barker code

b)

CCK

c)

Chips

d)

Data code encode

17.

What is the name of the chipping code that is used to achieve rates of 11 Mbps, and uses 64 unique code words when encoding the data?

a)

Barker code

b)

CCK

c)

Chips

d)

Data code encode

18.

Which encoding technique is used for 802.11 (WiFi), GPS, Cordless?

a)

DSSS

b)

FHSS

c)

OFTM

d)

MIMO

19.

Which are the organizations that manages and controls protocols like multimedia content over Wi-Fi networks- Wi-Fi Multimedia (WMM), WPA2, 802.11n etc?

a)

FCC

b)

ISO

c)

TRA

d)

WiFi alliance

20.

The timing of the signal between peaks is called by _________

a)

Phase

b)

Amplitude

c)

Frequency

d)

Power