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Posted By: dattu Member Level: Bronze Posted Date: 28 May 2008
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2000 Osmania University B.C.A semester exams Question paper
OU BCA IInd Year IInd Semester July 2000 - Electrical and Electronics Engineering - July 2000
PART - A
Answer the questions. Each question carries one mark.
1. what is the atomic number of an element with 14 protons and 14 electrons ?
2. What is the conductance of a resistance of 500 Ohms.
3. What is the total resistance and combined power a ratings of two K Ohms resistors rated at 2 W connected in parallel ?
4. A carbon-film resistor is color coded with red, green, black and gold stripes. What are its resistance and tolerance ?
5. How much will it cost to operate a 150 W Television for 24 hrs if the cost of electricity is 5 rupees per KWH ?
6. What is the ohm meter reading for an open circuit ?
7. What is the shunt resistance Rs needed to extend the range of 50 Ohms 1-mA movement to 100 mA ?
8. State Kirchoff's current law.
9. How many connections are there on an DPDT switch ?
10. Define impedance.
11. How much is the output voltage of a lead-acid cell ?
12. Cells are connected in _________ to increase the current capacity.
13. Give an example of a material with negative temperature coefficient.
14. Define wave length of a signal.
15. For a peak value of AC voltage of 100V, what is the value of rms value ?
16. What is the frequency of power lines in india ?
17. A constant current of 5 mA charges a 10-uF capacitor for 2 seconds. How much is the voltage across the capacitance ?
18. What is the capacitance and working voltage of the combination of two 0.02 uF 500v capacitors in series ?
19. A magnet produces 5000 field tines. What is value of magnetic flux in webers ?
20. Define coefficient of coupling.
21. What is the electronic valance of Silicon.
22. Expand FET.
23. Which electrode controls the output current for junction transistor ?
24. What is meant by modulation ?
25. A negative edge trigged flip flop has the following input ? J=0 and K=1. What are the Q and Q outputs after the clock input receives a negative-going clock pulse ?
PART - B
UNIT - I
2. a) Show the atomic structure of the element sodium (Na) with atomic number 11. What is its electron valance ? 4m
b) State the three forms of Ohm's law relating V, I and R. 3m
c) List the differences between a potentiometer and a rheostat. 3m
or
3 a) List and explain merits and demerits of five different types of fixed resistors. 5m
b) A 1000 ft length of wire has a conductance G of 0.4S. If the wire is carrying a current I of 10A, calculate I) the resistance of the wire
ii) the voltage drop across the wire iii) the power dissipated by the length of wire. 5m
UNIT - II
4 a) Explain the construction and operation of a basic moving-coil meter.6m
b) Draw a circuit with two bulbs, a battery and an SPDT switch that determines which bulb lights 4m
OR
5 a) List out the main features of a digital multimeter. 4m
b) Using Kirchoff's voltage law, calculate Vt, Rt, I, Vr1 and Vr2 in the following circuit 6m
UNIT - III
6 a) Explain why the terminal voltage of a battery drops with more load current. 4m
b) Explain the main parts of the electric motors. 6m
OR
7 a) List five types of chemical cells, giving two features of each 5m
b) How many cells are necessary in a battery to double the voltage and current ratings of a single cell ? Show the wiring diagram. 5m
UNIT - IV
8 a) Explain how charge is stored in the dielectric of a capacitor. 5m
b) Describe the working of transformer.
OR
9 a) List several types of capacitors and characteristics of each. 6m
b) Write notes on magnetic shielding. 4m
UNIT -V
10 a) Describe the physical construction of a diode. 5m
b) Using J-K flip-flops, draw a binary ripple counter whose natural modulus is 32. 5m
OR
11 a) Draw the schematic symbols for NPN and PNP transistors and label the electrodes. 4m
b) What is meant by rectifier ? Why is the diode a good example ? Give two applications of diode rectifiers. 6m
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