Osmania University (OU) 2000 B.C.A Computer Application Electrical and Electronics Engineering - Question Paper

Electrical and Electronics Engineering
BCA second Sem
July 2000
PART - A

ans the ques.. every ques. carries 1 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 2 K Ohms resistors rated at two W connected in parallel ?

4. A carbon-film resistor is color coded with red, green, black and gold stripes. elaborate 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 five rupees per KWH ?

6. What is the ohm meter studying 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 legal regulations.

9. How many connections are there on an DPDT switch ?

10. describe impedance.

11. How much is the output voltage of a lead-acid cell ?

12. Cells are connected in _________ to increase the current capacity.

13. provide an example of a material with negative temperature coefficient.

14. describe 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 five mA charges a 10-uF capacitor for two seconds. How much is the voltage across the capacitance ?

18. What is the capacitance and working voltage of the combination of 2 0.02 uF 500v capacitors in series ?

19. A magnet produces 5000 field tines. What is value of magnetic flux in webers ?

20. describe 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 subsequent input ? J=0 and K=1. elaborate 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 3 forms of Ohm's legal regulations relating V, I and R. 3m

c) List the differences ranging from a potentiometer and a rheostat. 3m

or

3 a) List and discuss merits and demerits of 5 various kinds 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, compute 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) discuss the construction and operation of a basic moving-coil meter.6m

b) Draw a circuit with 2 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, compute Vt, Rt, I, Vr1 and Vr2 in the subsequent circuit 6m

UNIT - III

6 a) discuss why the terminal voltage of a battery drops with more load current. 4m

b) discuss the main parts of the electric motors. 6m

OR

7 a) List 5 kinds of chemical cells, giving 2 features of every 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) discuss how charge is stored in the dielectric of a capacitor. 5m

b) define the working of transformer.

OR

9 a) List several kinds of capacitors and characteristics of every. 6m

b) Write notes on magnetic shielding. 4m

UNIT -V

10 a) define 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 tag the electrodes. 4m

b) What is meant by rectifier ? Why is the diode a good example ? provide 2 applications of diode rectifiers. 6m

Earning:   Approval pending.