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Aps 1003: Fundamentals Of Physics Question Paper

Aps 1003: Fundamentals Of Physics

Course:Information Technology

Institution: Technical University Of Mombasa question papers

Exam Year:2013

END OF SEMESTER EXAMINATION
SERIES: AUGUST 2013
TIME: 2HOURS

SECTION A
(COMPULSORY)

Question One

a) State the following:
(i) Kirchoff Law on current (KLC)

(ii) Kirchoff Law on voltage (KLV)
(4Marks)

b) Describe the factor that affect resistance of a wire.
(4Marks)

c) Define the following terms stating their SI units:
(i) Charge
(ii) Electromotive force
(iii) Capacitance
(iv) Resistivity
(8Marks)

d) Calculate the resistance of a copper wire of 240m with a cross-section area of 1.5mm² ( p for copper=0.0175x10-6O)
(4Marks)

SECTION B
(Answer any TWO
questions from this
section)

Question Two

a) Using graphical illustrations state and explain the Ohm''s Law
(6Marks)

b) Two resistors of 100O and 150O are connected in series and the connected in parallel to a 130O resistor. The circuit is supplied with 15V D.C Determine:

(i) Total current in the circuit
(ii) Current through 130O resistor
(iii) Voltage drop accross 150O resistor
(iv) Total power in the circuit
(8Marks)

c) With the aid of a circuit diagram, explain the operation of a half-wave rectifier circuit.
(6Marks)

Question Three

a) Explain the following:
(i) Rectification
(2Marks)
(ii) Voltage regulation
(2Marks)

b) With the aid of symbolic diagrams, explain the following with regard to diodes.
(i) Forward biasing
(2Marks)
(ii) Reverse biasing
(2Marks)

c) Three capacitor of 470 µF 300µF and 150µF are connected in series and then connected in paralle to a 100µF capacitor. The circuit is supplied with 12V D.C.. Determine:

(i) Total capacitance in the circuite
(ii) Charge across the circuite
(iii) Current through 100µF capacitor
(iv) Total energy in the circuit
(10Marks)

Question Four

a) With the aid of a symbolic diagrams, describe:
(i) Step-up transformer
(ii) Step-down transformer
(4Marks)

b) Explain the following:
(i) Frequency
(ii) Period
(iii) Amplitude
(6Marks)

c) A transformer 8:1 turns ratio is supplie with 110V produces 200w at the output. Calculate;
(i) Primary current
(ii) Secondary current
(iii) Secondary voltage
(6Marks)

d) Using symbols differenciate between P-N-P and N-P-N transistors.
(4Marks)

Question Five

a) Explain the factor which affects he capacitance of a capacitor. (4Marks)

b) Describe the following terms:
(i) Mutual induction
(ii) Self induction
(6Marks)

c) With the aid of a circuit diagram, explain the operation of a temperature stabilized sing stage transistor amplifier. Show that Vcc =IcRc+Vce+Ie Re
(10Marks)

Aps 1003: Fundamentals Of Physics Question Paper

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