Broadband Communication Systems 1

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Electronic Engineering MCQ Question Papers: ENTC, IT Interview Placement

Subject: Broadband Communication Systems 1

Part 1: List for questions and answers of Broadband Communication Systems


Q1. Broadband long-distance communications were made possible by the advent of

a) Telegraph cables

b) repeater amplifiers

c) Hf radi

d) Geostationary satellites


Q2. A scheme in which several channels are interleaved and then transmitted together is known as

a) frequency-division multiplex

b) Time-division multiplex

c) A group

d) A supergroup


Q3. A basic group b

a) occupies the frequency range from 60 to 108 khz

b) Consists of erect channels only

c) Is formed at the group translating equipment

d) Consists of five supergroups


Q4. Time-division multiplex

a) Can be used with pcm only

b) Combines five groups into a supergroup

c) Stacks 24 channels in adjacent frequency slots

d) interleaves pulses belonging to different transmissions


Q5. The number of repeaters along a coaxial cable link depends on

a) Whether separate tubes are used for the two directions of transmission

b) the bandwidth of the system

c) The number of coaxial cables in the tube

d) The separation of the equalizers


Q6. A supergroup pilot is

a) Applied at each multiplexing bay

b) Used to regulate the gain of individual repeaters

c) Applied at each adjustable equalizer

d) fed in at a gte 


Q7. Microwave link repeaters are typically 50 km apart

a) Because of atmospheric attenuation

b) Because of output tube power limitations

c) because of the earth’s curvature

d) To ensure that the applied dc voltage is not excessive


Q8. Microwave links are generally preferred to coaxial cable for television transmission because

a) they have less overall phase distortion

b) They are cheaper

c) Of their greater bandwidths

d) Of their relative immunity to impulse noise


Q9. Armored submarine cable is used

a) To protect the cable at great depths

b) To prevent inadvertent ploughing-in of the cable

c) for the shallow shore ends of the cable

d) To prevent insulation breakdown from the high feed voltages


Q10. A submarine cable repeater contains, among other equipment

a) A dc power supply and regulator

b) filters for the two directions of transmission

c) Multiplexing and demultiplexing equipment

d) Pilot injected pilot extract equipment


Q11. A geostationary satellite

a) Is motionless in space (except for its spin)

b) is not really stationary at all, but orbits the earth within a 24-hr period

c) Appears stationary over the earth’s magnetic pole

d) Is located at a height of 35,800 km to ensure global coverage


Q12. Indicate the correct statement regarding satellite communications

a) If two earth stations do not face a common satellite, they should communicate via a double-satellite hop

b) Satellites are allocated so that it is impossible for two earth stations not to face the same satellite

c) Collocated earth stations are used for frequency diversity

d) a satellite earth station must have as many receive chains as there are carriers

transmitted to it 


Q13. Satellite used for intercontinental communications are known as

a) Comsat

b) Domsat

c) Marisat

d) intelsat


Q14. Identical telephone numbers in different parts of a country are distinguished by their

a) Language digits

b) Access digits

c) area codes

d) Central office codes


Q15. Telephone traffic is measured

a) With echo cancellers

b) By the relative congestion

c) In terms of the grade of service

d) in erlangs


Q16. In order to separate channels in a tdmreceiver, it is necessary to use

a) and gates

b) Bandpass filters

c) Differentiation

d) Integration


Q17. To separatechannels in an fdm receiver, it is necessary to use

a) and gates

b) Bandpass filters

c) Differentiation

d) Integration


Q18. Higher order tdm levels are obtained by

a) dividing pulse widths

b) Using the a-law

c) Using the µ-law

d) Forming supermastergroups


Q19. Losses in optical fibers can be caused by (indicate the false statement)

a) Impurities

b) Microbending

c) Attenuation in the glass

d) stepped index operation 


Q20. The 1.55 µm “window” is not yet in use with fiber optic systems because

a) The attenuation is higher than at 0.85 µm

b) The attenuation is higher that at 1.3 µm

c) Suitable laser devices have not yet been developed

d) it does not lend itself to wave 


Part 1: List for questions and answers of Broadband Communication Systems


Q1. Answer: b


Q2. Answer: a


Q3. Answer: a


Q4. Answer: d


Q5. Answer: b


Q6. Answer: d


Q7. Answer: c


Q8. Answer: a


Q9. Answer: c


Q10. Answer: b


Q11. Answer: b


Q12. Answer: d


Q13. Answer: d


Q14. Answer: c


Q15. Answer: d


Q16. Answer: a


Q17. Answer: a


Q18. Answer: a


Q19. Answer: b


Q20. Answer: d