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Communication Engineering Exam Instructions - Unit 64EE2071, Manchester Met Uni, 1999/2000, Exams of Electrical Engineering

Manchester Metropolitan University (MMU)Electrical Engineering

The instructions for an examination in communication engineering for students pursuing beng (hons) electrical and electronic engineering and beng (hons) electronic engineering (part-time) at the manchester metropolitan university. The examination covers unit 64ee2071 and includes questions related to digital transmission, am radio, microwave ground links, optical fibre transmission, and transmission mediums. Students are required to answer four questions, each worth a specific number of points.

Typology: Exams

2010/2011

Uploaded on 10/06/2011

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S400 30/08/02
THE MANCHESTER METROPOLITAN UNIVERSITY
FACULTY OF SCIENCE AND ENGINEERING
DEPARTMENT OF ENGINEERING AND TECHNOLOGY
SESSION 1999/2000
Examination for the
BEng (HONS) ELECTRICAL AND ELECTRONIC ENGINEERING
BEng (HONS) ELECTRONIC ENGINEERING (PART-TIME)
YEAR TWO
UNIT 64EE2071: COMMUNICATION ENGINEERING
Monday 8 May 2000
2.00 pm to 4.00 pm
Instructions to Candidates
Answer FOUR questions.
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S400 30/08/

THE MANCHESTER METROPOLITAN UNIVERSITY

FACULTY OF SCIENCE AND ENGINEERING

DEPARTMENT OF ENGINEERING AND TECHNOLOGY

SESSION 1999/

Examination for the BEng (HONS) ELECTRICAL AND ELECTRONIC ENGINEERING BEng (HONS) ELECTRONIC ENGINEERING (PART-TIME) YEAR TWO

UNIT 64EE2071: COMMUNICATION ENGINEERING

Monday 8 May 2000

2.00 pm to 4.00 pm

Instructions to Candidates

Answer FOUR questions.

30/08/02 continued

  1. a) Discuss the major advantages of digital transmission in telecommunications systems. [4]

b) Indicate the limitations of such transmission when compared to analogue systems. [4]

c) State the Nyquist sampling theorem used during analogue to digital conversion, and comment on the result if it is not adhered to. [4]

d) A UK-32 channel bipolar PCM system has the following parameters:

Maximum baseband frequency = 3.4 KHz Maximum decoded voltage at Receiver = 2.55 V Minimum dynamic range = 40 dB.

Calculate:

(i) the sampling rate required; [2] (ii) the minimum number of bits used in the PCM coding; [9] (iii) the quantization error. [2]

  1. a) Using a block diagram explain the basic operation of a typical AM radio High Level Transmitter, and corresponding Superheterodyne Receiver. Indicate briefly the function of each block. [12]

b) An AM transmitter has an output of 50 kW with a modulation of 100% applied to the carrier. Calculate the output power after the modulation is reduced to 45%, one sideband is suppressed and the carrier is reduced by 15 dB. [10]

c) Sketch and label the spectral content of the transmitted wave, if the carrier frequency is 1MHz and the audio 4 kHz. [3]

S400 30/08/

  1. A communications satellite has a 20 dB aerial for reception of a 0.05m wavelength microwave signal from an earth station radiating 1.2 kW. The 120 dB gain satellite is 30,000 km from the earth transmitter and receiver stations, each having a 60 dB aerial. The power density at the satellite can be assumed to be 6 x 10-8^ W/m^2.

Calculate:

a) the power transmitted from the satellite to earth via its 30 dB aerial, at 0.08m wavelength; [9]

b) the ground station signal power; [10]

c) the S/N ratio in dBs at the ground station. [6]

Assume:- Aperture A =

G

λ^2 π

Signal Bandwidth = 50 MHz

Noise power/Hz = 0.4 x 10-20W

END