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Circuit Theory Question Paper

Circuit Theory

Course:Bachelor Of Electrical And Electronics Engineering

Institution: Moi University question papers

Exam Year:2010

INTRODUCTION TO ELECTRIC CIRCUITS.

1. How many joules of energy is required to carry a 20 kg parcel up four flights of stairs through a vertical distance of 11 m?

2. How many joules of energy is required to pump 2000 litres of water to the surface from a well which is 5 m deep?

3. How many joules of energy is required to raise the temperature of 4 litres of water by 35 degree celcius?

4. How many joules of heat energy must be developed by an electric stove element to heat 1 litre of water from 20 to 85 degree celcius, assuming that the container and radiation account for one third of the heat energy produced by the stove element?

5. What is the power rating of a toaster which draws a 5 A current from a 120 V source?

6. What is the power rating of a soldering iron which has a 110 V drop between its terminals when the current through it is 1.2 A?

7. At what rate is electric energy converted into heat in the heater of a cathode ray tube that is rated 6.3 V 0.6 A?

8. A 4 mA current through a resistor causes a voltage drop across the resistor of 120 V. What is the minimum "wattage" rating this resistor must have?

9. At what rate must a 75 ohm resistor be able to dissipate heat if the current through it is 2.5 A?

10. At what rate must a resistor convert electric energy into heat if 6000 J of heat is produced in 10 minutes?

11. What power rating must a 100 ohm resistor have to pass a current of 20 mA without overheating?

12. What "wattage" rating must a 10000 ohm resistor have to pass a current of 250 mA safely?

13. What "wattage" rating would you select for a 560 ohm bias resistor which has to pass a current of 36 mA?

14. At what rate is electric energy being converted into heat in a 1.5 ohm motor starting resistor when the starting current through it is 60 A?

15. What is the maximum current that a 20000 ohm 10 watt resistor can handle without overheating?

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