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WorksheetsMod 3,4,5
Total questions: 39
Worksheet time: 23mins
Which is NOT a benefit of the spread spectrum?
Fading of Signal
Relatively high security
Coexistence of several signal
Hard to detect
Which method of encoding is also known as biphase encoding?
Manchester
Clock
Data
Differential Manchester Encoding
What is the minimum sampling frequency from analog to digital frequency known as?
Nyquist Rule
Harry Nyquist
Nyquist Frequency
Nyquist Sampling
What is sent at the end of each PCM transmit frame?
Horizontal Signal
Sync Signal
Sync Pulse
Vertical Signal
Where is the program that performs mathematical operations and other manipulators are stored?
RAM
ROM
CPU
DISK
In synchronous transmission what is sent at the start of the transmission?
2 8bit synoronous code
8bit synoronous code
2 6bit synoronous code
8 2bit synoronous code
How long will serial transmitter take to transfer 4 bytes of data if each bit is transmitted at 5 us?
160 µ
160 n
160
160 m
In a frequency hopping spread spectrum the rate of synthesizer frequency change is higher or lower than data rate?
Lower
Higher
What is the number of voltage level increments for an 8 bit analog to digital converter?
256
255
215
257
Photodiode converts ______ into electrical signal?
Sound Energy
Thermal Energy
Light Energy
Kinetic Energy
In what orbit the satellite travels against the Earth rotation?
Geostationary orbit
Retro-grade orbit
Low Earth orbit
Polar orbit
In what transmission the bits in the data word are transmitted at the same time?
Parallel Data Transmission
Serial Data Transmission
FM audio broadcast signal is from 300 to 3k hz, what's the minimum analog sampling frequency?
6Hz
6 MHz
6 kHz
60 Hz
What angle is measured clockwise with respect to the north?
Altitude
Azimuth
Observer
Horizon
Complete optical spectrum consists of what?
Infrared , visible and ultraviolet
Infrared Only
Gamma Rays and infrared
Far infrared , visible and ultraviolet
Lasers are used as what in Optical communications?
Sound Source
Light Source
The main reason for fibre optical communication is because of _________?
Expensive to install
Low Power Loss
Increase bandwidth
Flexibility
Principle of behind of fibre optical is?
Total External Reflection
Total Internal Refraction
Total Internal Reflection
Total External Refraction
The ______ of fibre optical cable is made of Kevlar?
Strength Material
Strength Member
Flexible Material
The index of reflection of outer cladding N2 is ______ than the index of reflection N1 of the core?
Higher
Slightly Lower
Slightly Higher
Lower
Index of refraction of a graded cable is it _________ of the core?
Same at the centre
Minimum at the centre
Maximum at the centre
Most widely used light sensor is _______?
Phototransistor
Photodiode
LDR
When the angle of inclination is 0 degree where would the satellite be?
Directly below the Equator
Directly above the Equator
On the Equator
Time taken to complete one orbit is?
Satellite Days
Days
Satellite Period
Ability of satellite systems to use exactly the same frequency using polarization technique?
Frequency Resolution
Frequency Reuse
Frequency Response
Each C band uplink or downlink has a bandwidth range of how many MHz?
0.5 MHz
50 MHz
5 MHz
500 MHz
The heart of a transmission satellite is __________?
Communication Subsystem
Solar Sonars
Transponder
A ku satellite band is referred to 14/12bit, what does it mean?
14 Uplink , 12 downlink
12 Uplink , 14 downlink
Which of the following options is the solution to the communication loss of satellites when it's below the horizon?
Polar satellite
Geostationary satellite
Geosynchronous satellite
Which statement is not correct about GPS?
Altitude
Attitude
Aptitude
Which of the following statements is false regarding frequency reuse?
Improve the spectral Efficiency and Signal Quality
Total Bandwidth is divided into different sub
2 set of transponder that transmit in same frequency spectrum
The reason transponders perform frequency translation is because ________?
Transponder can transmit and receive at the same time
Transponder cannot transmit and receive on same frequency
Transponder cannot transmit and receive at the same time
Satellites with orbits with inclination of 90 degree are referred to as?
Geostationary orbits
Polar orbits
Transfer orbits
How does satellite systems overcome problems with land base navigation?
Satellite system can perform global coverage by 1 satellite
Satellite system can perform global coverage by multiple satellite
orbit system can perform global coverage by multiple satellite
What satellites act as relay stations in the sky?
Polar satellite
Remote Sensing satellite
Communication satellite
Which of the following multiplexing methods provide security?
FDM
CDMA
WDM
Which of the following is not a ground station subsystem?
Power
Transmitter
Communication Subsystem
What are the 4 benefits of fibre optic?
What are the 3 common applications for satellite?
