PHY301 Final Term Past Paper Fall 2004

FINAL TERM EXAMINATION · SEMESTER (Fall 2004) · PHY-301 CIRCUIT THEORY · Instructions · CQ carries 1 Marks

c. While attempting descriptive question do not miss any step so that you could get

better marks.

d. Do not ask about the contents of any question of this examination from anyone.

e. If you think that there is something wrong with any of the

questions, attempt it to

the best of your understanding.

g. On the other hand, if you believe that all of the choices provided for a particular

question are the wrong ones, select the one that appears to you as being the least

wrong.

h. The duration of this examination is 120 minutes.

ID · Exam Center · 11-02-2005

i. This examination is closed book, closed notes, closed neighbors.

k. Draw Circuit diagrams (where necessary) for each step.

**WARNING: Please note that Virtual University takes serious note of unfair

means. Anyone found involved in cheating will be given grade `F` in this course.

Question Total Signature

Marks

Q1. Marks: 5

For each question given below, encircle the option that in your opinion represents the best/ correct

Answer: I) Choose the correct term, an electronic device that is capable of storing a charge for a long time. a) Transistor b) Semi-conductor c) Capacitor d) Diode

II) The unit of electrical potential difference is

a) watt b) Volt c) ohm d) ampere

III) Resistances R1 and R2 are in series with 90 V applied. If V1 is 30 V then V2 must be

a) 30 V b) 90 V c) 45 V d) 60 V

IV) In an N –type semiconductor materials, the majority carrier are

a) Holes b) Electrons c) Ions d) Protons V) When a current of 20 milliamps flows through a 50 ohm resistor the voltage drop across the resistor will be: a) 100 mill volts b) 10 mill volts c) 1 volt d) 10 volts

Q2. Marks: 15

Use Mesh analysis to find currents through all Meshes. Label circuit diagram properly. Write each step of the calculation to get maximum marks.

Q3. Marks: 12

Find Vo in the network using Source Transformation. Draw and label the circuit diagram of each step, otherwise you will lose your marks. Write each step of calculation to get maximum marks.