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Exam Instructions for Unit 64EE2061: Electronic Apps II at Manchester Met Uni, Exams of Electrical Engineering

Manchester Metropolitan University (MMU)Electrical Engineering

The instructions for an examination held at the manchester metropolitan university in 1999/2000 for unit 64ee2061: electronic applications ii at the bsc combined honours stage two. The examination covers various topics including sensors, smoke alarms, humidity, fuses, human body, electrical equipment testing, electricity at work regulations, automobile batteries, fuel level sender units, automatic braking systems, and ultrasonic intrusion detector systems.

Typology: Exams

2010/2011

Uploaded on 10/06/2011

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S853 30/08/02
THE MANCHESTER METROPOLITAN UNIVERSITY
SESSION 1999/2000
Examination for the
BSc COMBINED HONOURS
STAGE TWO
UNIT 64EE2061: ELECTRONIC APPLICATIONS II
Wednesday 17 May 2000
9.30 am to 12.30 pm
Instructions to Candidates
Answer ALL questions in Section A and ONE question in Section B.
Marks are shown in parentheses.
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S853 30/08/

THE MANCHESTER METROPOLITAN UNIVERSITY

SESSION 1999/

Examination for the BSc COMBINED HONOURS STAGE TWO

UNIT 64EE2061: ELECTRONIC APPLICATIONS II

Wednesday 17 May 2000

9.30 am to 12.30 pm

Instructions to Candidates

Answer ALL questions in Section A and ONE question in Section B.

Marks are shown in parentheses.

30/08/02 continued

SECTION A

  1. Explain the principle of operation and the application of the following types of sensor:

(a) magnetoresistive; [5]

(b) piezoelectric; [5]

(c) thermistor; [5]

(d) light dependant resistor; [5]

(e) gas pressure sensor. [5]

  1. Explain how a domestic smoke alarm detector works. [5]
  2. Explain the term Relative Humidity, and briefly describe the types of sensor available to measure such a quantity. Where would this type of sensor be useful and for what reason? [10]
  3. A fuse and an over-current circuit breaker, each rated 1 A, protect an electronic circuit. For the conditions listed below estimate which of the devices would operate first and explain the reason for your choice.

(i) A sustained overload, 2 A. (ii) A short circuit, 50 A. [5]

  1. (a) With regard to the human body state the approximate minimum current, passing through the heart, that will cause death and the maximum a.c. r.m.s. voltage that is considered safe to work with.

(b) Briefly describe the stroboscopic effect and how this can present danger in a laboratory or workshop. [6]

  1. (a) Outline the meaning of the term “earthed equipment” and “double insulated equipment”.

30/08/02 continued

  1. (a) Describe the principle of operation of an automatic braking system, ABS, and state the typical input and output signals of an ABS electronic control unit.

(b) Explain with the aid of a diagram how the speed control signal from a wheel is produced. [6]

S853 30/08/

SECTION B

  1. What are the advantages and limitations of Ultrasonic Intrusion Detector Systems? [5]

Explain:

(a) the difference between an ultrasonic wave and a radio wave; [3]

(b) how ultrasonic energy is generated practically; [3]

(c) the principle of operation of the two main types of ultrasonic transducers; [2]

(d) how ultrasonic waves are detected using a block diagram; [5]

(e) why a time delay is built into the practical circuitry of intrusion detectors. [2]

  1. (a) Describe the principle of operation of a tungsten halogen filament lamp and state two advantages of the lamp compared to the basic tungsten filament lamp.

(b) Describe the advantage of using a cluster of light emitting diodes as a vehicle brake lamp compared to using filament lamps.

(c) Sketch a schematic circuit diagram, component values not required, showing how a lamp can be automatically switched on when the ambient light is dark. Include in your circuit a light dependent resistor, resistance decreases when exposed to light, and “Darlington pair” transistors. Explain the inter-action of each stage of the circuit for both light and dark ambient conditions. [20]

END