Name: ______________________________ ID:________________________________

FACULTY OF ENGINEERING TECHNOLOGY

TEST

COURSE : ELECTRICAL FUNDAMENTALS

COURSE CODE : BTP1523

LECTURER : Mohammed Hayyan ALSIBAI

DATE : 26 May 2015

DURATION : 30 MINUTES

SESSION/SEMESTER : SESSION 2014/2015 SEMESTER II

PROGRAM : BTP

INSTRUCTIONS TO CANDIDATES

1. Answer in the given space after each of the questions.

2. Answer ALL the questions in both parts.

EXAMINATION REQUIREMENTS

DO NOT TURN THIS PAGE UNTIL YOU ARE TOLD TO DO SO

This examination paper consists of 6 SIX printed pages including front pages

CONFIDENTIAL BTP1523

2

Question 1 [CO2] (10 Marks)

Circle the correct answer:

The expression to determine the total resistance in the figure Q1 below is

a) R1+R2+R3+R4//R6+R5//R7

b) R1//R2+R3+R4//R6+R5//R7

c) R1+[(R2+R3+R4)//(R5+R6)]+R7

d) R1+[(R2+R3+R4)//(R5+R6)]//R7

Figure Q1

Question 2 [CO2] (10 Marks)

In Figure Q2 If current through the 4Ω resistor is 4 A, determine the current through the 6Ω resistor

Figure Q2

16/6 = 2.66 A

RT

CONFIDENTIAL BTP1523

3

Question 3 [CO2] (30 marks)

For the Figure Q3 calculate: (30 marks)

Figure Q3

a) Total resistance RT (10 Marks)

b) Currents I1, I2 and I3 (15 Marks)

c) Voltage Vab (5 Marks)

a) RT = (10//5)+ 15 = 18.3333Ω

b) I3 = IT = E/RT = 0.545A

I2 = 0.18A

I1= 0.36A

c)Vab = 1.8V

CONFIDENTIAL BTP1523

4

Question 4 [CO1] (50 marks)

For the Figure Q4 calculate: (50 marks)

Figure Q4

a) Calculate XC, XL, Z and write the answer in rectangular and polar form.

(25 Marks) b) Calculate I

(10 Marks) d) Calculate VR, VL, VC.

(15 Marks)

CONFIDENTIAL BTP1523

5

I = IR = IL = IC = E/Z = (12.589 + j76.7)mA = 77.7mA∟80o

VR = I ZR = 19.4V∟80.6o or (3.14 + j 19.177) V

VL = I ZL = 19.04V∟170.68o or (-18.79.14 + j 3.08) V

VC = I ZC = 137.46V∟-9.3o or (135.65 - j 22.26) V

Remark:

END OF QUESTION PAPER