Cochin University of Science and Techology (CUST) 2006 B.Tech Civil Engineering Electrical Engineering - Question Paper

BTS(C - I - 06 - 008 (A)

B. Tech Degree I & II Semester (Combined) Examination June 2006

IT/CS/EC/CE/ME/SE/EB/EI/EE 108 FUNDAMENTALS OF ENGINEERING II

(a) ELECTRICAL ENGINEERING

(All Questions Carry EQUAL marks)

Maximum Marks : 100

(a) Electrical Engineering

(All questions cany equal marks)

I. (a) Stale the three forms of Ohms law relating V, 1 and R.

(b) In the following circuit what is the net resistance across the voltage source? Also calculate ;he voltage across and R_fv

V1
	R2 3.2ohm

OR

II. (a) Solve Vrj, the voltage across R2 using s tper position theorem.

(b) State and explain Norton,s theorem with an arbitrary example of your own.

III. (a) The flux density of 0.002 T in the air core of an electromagnet. When an iron core is inserted, i he flux density in the core is 0 6 f. How much is the relative permeability jii_r of the iron core?

(b) Explain the working principle of a D* Arsonval movement. A 50 jiA movement: has r_M of 100 3 Q. What R_s is needed to extend the range to 500 f.tA?

OR

IV.    (a) Explain hew magnetic materials are classified? Give example materials and (.irvalues.

(b) Calculate the rate of flux change    Wb/Sec for, 6 Wb increasing to 8 Wb in

one second and 8 Wb decreasing to 6 Wb in 1 s. Calculate the voltage induced in 400 turns by each of the flux change.

V.    (a)What R is needed in series with a 0.01 jliF for a phase angle of-64, with f of 800 Hz? (b) Draw a sei ies R-L-C circuit and derive the resonance frequency. Also obtain

expressiors for the Q-factor and voltage across each of the component.

OR

VI.    (a) Define anc explain the time constants of RC and RL circuits.

(b) Show that the line current drawn by a balanced A-connected load from a balanced

3-phase scurce is V3 times the phase current. Draw the current phasor diagram for ABC sequence.

(b) Electronics Engineering

VII.    (a) Explain the working principle of Zener diodes with the help of its V-f characteristics.

Which is t le material used for its fabrication? Why?

(b) Compare t lie general electrical features o 'Si and Ge diodes.

() Draw the lull wave bridge rectifier circui:. Give its output with and without capacitor filter and explain the role of filters.

OR

VIII.    (a) Compare ('E and CC transistor configurations with respect to current gain, voltage

gain, inpul impedance and output impedance. Which is suitable for amplifier design? (b) Explain the temperature dependence of electrical conductivity of intrinsic

semicondt ctors. Mention one use for intrinsic semiconductors. Explain how- doping will affect the conductivity.

IX.    (a) Differentiate between active and passive :ransduceis with examples for each. What is

thermocouple? Explain the principle of operation. List the materials for fabrication.

(b) Explain hew LCDs are classified? Explain the principles of operation. Compare LEDs

and LCDs as display devices.

/    OR

X.    (a) Explain tho methods for phase and frequency measurement using CRO.

(b)    Draw the eharacteristies of a P-channel FET and explain. Define fx and g,

(c)    What is stiain gauge? Define gauge factor. List the advantages of semiconductor strain gauges.

XI. (a) Define and explain modulation index in AM and FM. Compare the features of frequency and amplitude modulation schemes.

(b) What are t le essential components of a d gital communication system? Explain.

OR

XII. (a) Compare digital and analog coivumrnication systems.

(b) Explain liie principle of AVI and FM demodulation.

Attachment: cochin-university-of-science-and-techology--cust--2006-b-tech-civil-engineering-36804-1.pdf

Earning:   Approval pending.