dien tu va may tinh le chi thong 2014 10 ece midterm (2) cuuduongthancong com

HO CHI MINH CITY UNIVERSITY OF TECHNOLOGY – FACULTY OF ELECTRICAL AND ELECTRONICS ENGINEERING

INTRO TO ELECTRICAL AND COMPUTER ENGINEERING (ECE110)
MIDTERM EXAMINATION
Semester 1 (2014-2015)
Duration: 60 min

Student’s Name

Score

Student ID Number

Department of Electronics Engineering

Lecturer

Dr. Le Chi Thong
INSTRUCTIONS:
 Answer on this question sheet.
 Lectures, class notes, books, laptops, iPads, … are NOT accepted.
 Arithmetic-only calculators are accepted.
 Show all your work, e.g., your solution process, the equation(s) that you use, the values of the
variables used the equation(s), …
 Include the unit of measurement in each answer.
 Do NOT communicate with any other students.
Problem 1
a) Compute the variation of charge from 0 to 11 sec for the following current:
(i) I = 5 mA

(ii)

(0.5 points)

(1.0 point)
7

I [mA]

3
6

9 11

t [sec]

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HO CHI MINH CITY UNIVERSITY OF TECHNOLOGY – FACULTY OF ELECTRICAL AND ELECTRONICS ENGINEERING

b) Compute the period,
6
4
2

of the following signal.

(1.5 points)

V [V]

3

T=

and

9

t [sec]

12 15

VAve =

VRMS =

Problem 2
Find the resistance between A and B.

(1.5 points)

RAB =
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HO CHI MINH CITY UNIVERSITY OF TECHNOLOGY – FACULTY OF ELECTRICAL AND ELECTRONICS ENGINEERING

Problem 3. Use the following circuit for this problem.

a) Find the value of V1, V2, I1, I2 and I.

V1=

V2=

I1 =

I2 =

(1.5 points)

I=

b) Compute the power of all elements in this circuit and specify the elements are source or load. (1.0
point)

10V
element

5Ω
element

Power
Source/Load
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5V
element

10Ω
element


HO CHI MINH CITY UNIVERSITY OF TECHNOLOGY – FACULTY OF ELECTRICAL AND ELECTRONICS ENGINEERING

Problem 4.
a) Find the IV characteristic of the circuit below.
Given V1= 9 V; R1= 4 Ω; R2= 6 Ω; R3= 8 Ω.

b) Find the IV characteristic of the circuit below.
Given I4 = 5 A; R4= 3 Ω; R5= 7 Ω

(1.5 points)

(0.5 points)

c) Find the values of I2 and V2 when circuit in a) and circuit in b) are connected together. (1.0 point)

V2 =

I2 =

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