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WorksheetsWCM Chapter 3
Total questions: 54
Worksheet time: 28mins
Which of the following is NOT an 'Unguided' media?
Optic Fibre
Satellite
Broadcast Radio
Infrared
Which of the following describes 'Shielded Twisted Pair' (STP) cables?
Has an inner conductor surrounded by a tubular insulting layer, surrounded by a tubular conducting shield.
Has an overall sheath shield across all cable pairs.
Has pairs of wires wrapped in metallic foil.
Has twisted cable pairs.
Which of the following type of cable offers highest data speed transmission?
Coaxial
UTP
STP
Fibre Optic
The frequency range of 30 MHz to 300 MHz is known as the ________ Frequency Band.
HF
VHF
UHF
SHF
An Antenna having a Gain of 25dBd has a gain of _____ dBi.
22.86 dBi
25 dBi
27.14 dBi
30 dBi
what is the process known for light can be trapped in the fiber core
Total internal reflection
Total external reflection
Total internal refraction
Total external refraction
Which frequency band support Line-of-Sight
Medium Frequency
High Frequency
Low Frequency
Super High Frequency
What are the two main categories of Polarization?
round, sharp
flat, long
Linear, Circular
square, hexagon
Beam Width of the antenna is the ___________within which the ____________ radiated above one-half of the preferential direction
theory, voltage
angle, power
value, current
axis, current
Isotropic antenna has a ____________________vertical and horizontal beam width
perfect 360 degree
straight
flat
round
Rank the cable from most economical to expensive.1 UTP2 Coaxial Cable3 Fibre Optic Cable4 STP
1, 4, 2, 3
1, 2, 3, 4
4, 1, 2, 3
4, 1, 3, 2
Rank the cable from difficult to easy to install1 UTP 2 STP3 Coaxial Cable4 Fibre Optic Cable
4, 3, 2, 1
1, 2, 3, 4
2, 1, 3, 4
4, 3, 1, 2
Based on Signal Attenuation, which guided medium will you choose?
Fibre Optic
Coaxial Cable
STP
UTP
Given that the cable will be running in parallel to area with high Electromagnetic Interference, which guided medium will you choose?
Fibre Optic
Coaxial Cable
STP
UTP
Which of the following is plastic jacket?
A
B
C
D
Which label is dielectric insulation?
A
B
c
D
Which of the following is metallic shield?
A
B
C
D
Which of the label is centre core?
A
B
C
D
Which label is Black Polyurethane jacket?
A
B
C
D
Which label is Strength Members?
A
B
C
D
Which of the label is core (silica)?
A
B
C
F
Which of the label is buffer jacket?
A
B
C
D
Which of the label is silicone coating?
C
D
E
F
Which of the label is Cladding (Silica)?
C
D
E
F
Twisted Pair Cable is most widely used as
it is the least expensive type of cable.
it is less susceptible to interference.
it allow higher frequency bandwidth.
it allow higher data rates.
Coaxial cable is used when ____ as compare to TP cable. (choose any two)
easier to install
higher frequency bandwidth
higher data rate
more economical
Which of the following is NOT advantages of fibre optic cable?
Tremendous capacity
Low Attenuation
Light weight
Easy to install
Which of the following is unguided medium?
fibre optic
Terrestrial Microwave
coaxial cable
STP
______ wave consist of Electrical and magnetic fields.
Sound
Radio
Seismic waves
Ocean
Which of the following is True on Electromagnetic wave?
The electrical and magnetic field are out of phase
The electrical and magnetic field are perpendicular.
The electrical and magnetic field are having opposite direction of propagation
The electrical and magnetic field have different frequency of propagation.
A transmitter antenna is fixed rigidly and focuses a narrow beam to achieve line-of-sight transmission to the receiving antenna, describe which type of radio waves transmission?
Satellite
broadcast radio
Terrestrial Microwave
infrared
Which of the following is True for satellite communication?
There are three stations in satellite communication
The satellite received through uplink and transmit through downlink
The uplink and downlink are having same frequency
One satellite can have only either uplink or downlink.
The different between radio wave and infrared transmission is?
Infrared and radio wave are transmit through different medium
Infrared reflect but radiowave does not
Infrared and radio wave having different speed for travelling
Infrared unable to transmits across the wall, but radio wave can
For infrared transmission, the receiver ____.
can be anywhere
need to be at line of sight or through diffuse ray from reflection through light-coloured surface.
No need to be at line of sight
can be anywhere
Which of the following is true for broadcast transmission?
The antenna need not be precisely mounted and aligned
The antenna need to be properly fixed to a certain height
The antenna need to be properly fixed to a certain direction
The antenna need to be properly fixed to certain height and direction.
MF is in the range of
300kHz to 3MHz
3MHz to 30MHz
30MHz to 300MHz
300MHz to 3GHz
HF frequency range is
30MHz to 300MHz
3MHz to 30MHz
3GHz to 30GHz
300MHz to 3GHz
VHF frequency range is
3MHz to 30MHz
30MHz to 300MHz
300MHz to 3GHz
3GHz to 30GHz
UHF frequency range is
3MHz to 30MHz
30MHz to 300MHz
300MHz to 3GHz
3GHz to 30GHz
SHF frequency range is
3MHz to 30MHz
30MHz to 300MHz
300MHz to 3GHz
3GHz to 30 GHz
Select the frequency that propagate through sky (more than 1)
MF
HF
VHF
UHF
Select the frequency range that propagate through line of sight. (more than 1)
MF
HF
UHF
SHF
Attenuation is known as the ratio of
Radiated power over power received by the antenna
Power received by the antenna over the radiated power
radiated power over the reflected radiated power at the same point
the different between the actual signal over the step size for quantisation
The higher the frequency,___
the lower the attenuation
the higher the attenuation
no difference for the attenuation, it depends on power
no difference for the attenuation, it depends on the medium it is tranmitting in.
In order to increase the distance of transmission, which of the following can be done?
increase antenna gain
Increase transmission power
Decrease the receiver sensitivity
Increase system losses
Radiation plot show the ____
power of radiation apply to the antenna over time
phaser representation of antenna transmission
intensity of radiation or reception in all direction of an antenna.
frequency representation of antenna transmission
Radiation plot does not provide additional meaningful information for which antenna?
omnidirectional
Parabolic dish
Yagi Antenna
Directional Antenna
Transmission can be best received under ____
Cross polarization
Vertical polarization
Horizontal polarization
same polarization
left-handed polarization is an example of
circular polarization
linear polarization
horizontal polarization
cross polarization
Bandwidth of antenna defines
The upper limit and lower limit of transmission set by the system
the range of frequency the antenna can perform within acceptable range
band that antenna is able to accept the energy from radiowave
width of the antenna
Beam Width is ___
used in omnidirectional antenna
angle of the antenna with 100% power
angle within which the power radiated is above onehalf (50%) of the value in the preferential (desired) direction
used in direction antenna to determine whether the antenna is working or not
___ antenna has perfect 360degrees horizontal and vertical beam width
Yagi
Isotropic
circular dish
Real
When reference antenna changes from dipole to isotropic antenna
substract 2.14dB from dBd
add 2.14dB from dBi
add 2.14dB from dBd
substract 2.14dB from dBi
When reference antenna change from isotropic to dipole?
substract 2.14dB from dBd
subtract 2.14dB from dBi
Add 2.14dB from dBi
add 2.14dB from dBd
