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WorksheetsCommunication Systems, 18P4PH11
Total questions: 25
Worksheet time: 50mins
A satellite signal transmitted from a satellite transponder to earth’s station is ……….
A) Downlink
B) Uplink
C) Terrestrial
D) Earthbound
What band does VSAT first operate?
A) L - Band
B) C - Band
C) X - Band
D) Ku - Band
A satellite beam that covers almost 42.4% of the earth’s surface is called ……………
A) Zone beam
B) Hemispheric beam
C) Global beam
D) Spot beam
Of the four INSAT-I satellites planned by India so for, only …………… has proved to be successful.
A) INSAT-IA
B) INSAT-ID
C) INSAT-IC
D) INSAT-IB
At present, the radio-frequency band mainly used by most satellites is ……….
A) UHF
B) VHF
C) EHF
D) SHF
A geostationary satellite is one which ......
A) Hangs motionless in space about 36000 km about Earth
B) Travels around the Earth in 24 hours
C) Appears stationary to everybody on Earth
D) Remains stationary above the Earth
Which technique uses spot beam antenna to divide the area covered by the satellite into smaller segments?
A) Frequency reuse
B) Spatial isolation
C) Multiplexing
D) Modulation
The Area on the earth that is “Covered” by a Satellite Is Called ........
A) Foot Print
B) Plate
C) Earth Station
D) DownLink
DBS Stands for...........
A) Decibels - Band Signals
B) Down - Beam Signal
C) Direct - Broadcast System
D) Direct - Broadcast Satellite
The carrier to noise ratio for a satellite depends upon .........
A) Bandwidth
B) Free Space Path Losses
C) Effective Isotropic Radiated Power
D) All of them
What is an polar antenna?
A) An double actuator is used which moves the antenna in a circular arc ie known as polar mount
antenna
B) A single actuator is used which moves the antenna in a elliptical arc ie known as polar mount antenna
C) A single actuator is used which moves the antenna in a circular arc ie known as polar mount
antenna
D) None of above
What is an OMT?
A) The polarization seperation takes place in a device known as an ortho-coupler or orthogonal
mode transducer
B) The polarization combiner takes place in a device known as an ortho-coupler or orthogonal mode
transducer
C) Either A or B
D) None of Above
What are the types of antenna losses?
A) Sky Noise
B) Both A & C
C) Antenna Losses
D) Modulation Noise
.............. multiple access is a spread-spectrum transmission technology.
A) Frequency Band
B) Frequency Hopping
C) Frequency Spectrum
D) Frequency Modulation
The number of days when Earth’s shadow falls on a geosynchronous satellite is ........
A) 88
B) 97
C) 87
D) 98
VSAT was made available in ……...
A) 1979
B) 1989
C) 1999
D) 1978
The angle subtended by earth at geostationary communication satellite is ......... degree.
A) 15.34
B) 60
C) 120
D) 17.34
The quality of a space - link is measured in terms of the ………. ratio.
A) EIRP
B) S / N
C) C / N
D) G / T
Orbital disturbances of a geosynchronous satellite are caused by the.........
A) Moon
B) Sun
C) Earth
D) All of the above
Repeaters inside communication satellites are known as ………
A) Transducers
B) Transponders
C) Transceivers
D) TWT
INTELSAT stands for ………….
A) Intel Satellite
B) International Telecommunications Satellite
C) International Satellite
D) International Telephone Satellite
………… is defined as the use of orbiting satellites to receive, amplify and retransmit data to earth stations.
A) Satellites Communication
B) Digital Communication
C) Analog Communication
D) Optical Communication
What is meant by GPRS ?
A) Global Packet Radio Service
B) General Packet Radio Service
C) General Packet Receiver Service
D) Global Packet Receiver Service
Calculate the radius of a circular orbit for which the period is 1 day ?
A) 4.2241 m
B) 42.241 m
C) 42.241Km
D) 4.2241 Km
What is application of satellite ?
A) Terrestrial Communication
B) Point to Point Communication
C) Signal Transmission
D) Whether Forecasting
