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ECE602S - ELECTRICAL CIRCUITS AND ELECTRONICS - 1ST OPP - NOVEMBER 2023 |
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nAmlBIA UntVERSITY
OF SCIEnCEAnDTECHnOLOGY
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Departmentof Biology,
ChemistryandPhysics
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QUALIFICATION: BACHELOR OF SCIENCE
QUALIFICATIONCODE: 07BOSC
COURSE:ELECTRICALCIRCUITS AND ELECTRONICS
DATE: NOVEMBER 2023
DURATION: 3 HOURS
LEVEL:6
COURSECODE: ECE602S
SESSION: 1
MARKS: 100
FIRST OPPORTUNITY: EXAMINATION QUESTION PAPER
EXAMINER:
MODERATOR:
PROF MUNAWAR KARIM
DR VAINO INDONGO
INSTRUCTIONS
1. Answer all questions on the separate answer sheet.
2. Please write neatly and legibly.
3. Do not use the left side margin of the exam paper. This must be allowed for the
examiner.
4. No books, notes and other additional aids are allowed.
5. Mark all answers clearly with their respective question numbers.
PERMISSIBLE MATERIAL:
Non-Programmable Calculator
This paper consists of 4 pages including this front page
Electrical Circuits and Electronics (ECE602S}
ist Opportunity November 2023 1
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1) A cell of emf£ has internal resistance r.
(a) Using a voltmeter, ammeter, variable resistor and wires set up an experiment to
measurer. Draw a circuit diagram.
(10)
:r E
(b) If current I flows in the circuit, and Vis the potential across the cell show that
= = £ V + Ir. Rewrite this as V -rl + £, which looks like the equation of a straight
line with sloper and intercept£.
(10)
(c)
= In an experiment the data fit the equation V -1.111 + 1.6. What is the value of r?
{10)
Electrical Circuits and Electronics (ECE602S)
1st opportunity November 2023 2
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(2) The output and input from a circuit are measured as a function ohime.
A graph of Vout(V) vs t (s) is shown below:
V out (V) vs time (s)
15
-15
The input Vin (V) vs t(s) is shown below:
Vin (V) vs time (s)
1.5
0.09
-1.5
(a) Design a circuit which has an output Vout given Vin as shown.
(15)
(b) Calculate the component values.
(15)
Electrical Circuits and Electronics (ECE602S)
pt Opportunity November 2023 3
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(3) Draw a circuit for a RC-bandpassfilter.
(10)
(a) Calculate Rand C-values when the low-frequency cut-off value
is 3000 Hz.
(10)
(b) Calculate the Rand C values when the high frequency cut-off value
is 10,000 Hz.
(10)
(c) Draw a graph of ln v 0 /vi vs ln(f).
(10}
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END OF QUESTION PAPER
Electrical Circuits and Electronics (ECE602S)
1st opportunity November 2023 4