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Home⇒ Engineering⇒
Satellite communication
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q1 ⇒ Rotation of a geosynchronous satellite means its wobbling [other wrong options] [Discuss in forum] drift from stationary position three-axis stabilization three-dimensional stabilization |
Q2 ⇒ To make antenna more directional, either its size must be increased or the frequency of its transmission must be increased [other wrong options] [Discuss in forum] the number of its feed horns must be increased its effective isotropic radiated power (EIRP) must be increased its footprint must be increased |
Q3 ⇒ Which one of the following statements regarding compandor is FALSE? For weaker signals it gives a poor ratio of signal strength to quantizing error [other wrong options] [Discuss in forum] It compresses the higher-amplitude parts of a signal before modulation and expands them back to normal again after demodulation. It gives preferential treatment to the weaker parts of the signal Weaker signals, traverse more quantum steps than they would do otherwise and so quantizing error is reduced. |
Q4 ⇒ In a stop-and-wait ARQ system, the transmitting terminal does not wait for acknowledgement after sending a block [other wrong options] [Discuss in forum] waits for positive or negative acknowled-gement from the receiving terminal after sending a block sends another block if positive acknowledge is received through ACK character resends the previous block if negative acknowledgement is received through a NAK character |
Q5 ⇒ For satellite communication, standard Earth stations have antenna diameters in the range of __________ metre. 27.5 to 30 [other wrong options] [Discuss in forum] 10 to 15 30 to 50 5 to 10 |
Q6 ⇒ In the context of error detection in satellite transmission, ARQ stands for Automatic Repeat Request [other wrong options] [Discuss in forum] Automatic Relay Request Accelerated Recovery Request Automatic Radiation Quenching |
Q7 ⇒ In synchronous detection of an AM signal Only one side band and part of carrier is suppressed [other wrong options] [Discuss in forum] Carrier is completely suppressed Both side hands are suppressed One side band and full carrier is suppressed |
Q8 ⇒ Depending on the technique used, digitized television requires a bit rate between __________ millions. 40 and 92.5 [other wrong options] [Discuss in forum] 25 and 60 30 and 82.5 2 |
Q9 ⇒ A satellite link uses different frequencies for receiving and transmitting in order to avoid interference between its powerful transmitted signal and weak in coming signal [other wrong options] [Discuss in forum] avoid interference from terrestrial microwave links minimise free-space losses maximise antenna gain |
Q10 ⇒ The distance of a synchronous satellite from Earth's surface is __________ km. 35900 [other wrong options] [Discuss in forum] 300 10000 5 |
Q11 ⇒ The maximum signal propagation time of a geosynchronous satellite transmission is about __________ millisecond. 270 [other wrong options] [Discuss in forum] 540 135 1080 |
Q12 ⇒ The discussing sharing of a communication satellite by many geographically dispersed Earth station, DAMA means Demand-Assigned Multiple Access [other wrong options] [Discuss in forum] Decibel Attenuated Microwave Access Digital Analog Master Antenna Dynamically-Assigned Multiple Access |
Q13 ⇒ The number of days when Earth's shadow falls on a geosynchronous satellite is 88 [other wrong options] [Discuss in forum] 277 5 10 |
Q14 ⇒ A certain sound has 10000 times more energy than another sound. The number of times it would sound stronger to a listener is 40 [other wrong options] [Discuss in forum] 10000 100 10 |
Q15 ⇒ Which of the following factor does NOT contribute to the drift of a geostationary satellite from its stationary position in space? Weight of the satellite [other wrong options] [Discuss in forum] Pressure of solar radiations Gravitational changes due to Sun and Moon Oblateness of the Earth |
Q16 ⇒ In envelope detection of an AM waveform Both side bands and full-amplitude carrier are needed [other wrong options] [Discuss in forum] One side band and full-ampiitude carrier are needed Only two side bands are needed Upper side band and part of carrier are needed |
Q17 ⇒ Mark out the WRONG statem Is less flexible so that channels of widely different capacities cannot used and intermixed [other wrong options] [Discuss in forum] Needs very high-speed burst modems Faces no problems caused by intermodulation of carriers so that transponder can be used at its full power Needs high-speed manipulation of bit streams |
Q18 ⇒ Most of the communication satellites are stationed to the West of their service areas in order to reduce their battery power provision [other wrong options] [Discuss in forum] eclipse period loss of power mass of station-keeping fuel |
Q19 ⇒ The average noise temperature of Earth, as viewed from space, is __________ °K. 254 [other wrong options] [Discuss in forum] 303 100 500 |
Q20 ⇒ The lowest frequency used in satellite communications is __________ GHz. 0.8 [other wrong options] [Discuss in forum] 3 18 30 |
Or |