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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

CIRCUIT THEORY
REVIEW QUESTIONS.

1. What is the maximum voltage that can be safely applied to a 20000 ohm 10 W resistor?

2. What voltage drop will there be across a 1 kW stove element whose resistance when hot is 40 ohms?

3. What voltage drop will there be across a 75 ohm 3 watt Christmas used lamp?

4. A certain voltmeter has a resistance of 150,000 ohm. While it is measuring a voltage source, it draws energy from the source at the rate of 96 mW. What is the PD of the source?

5. If the 600 mA heater of television picture tube must produce heat at the rate of 3 W, what is the voltage drop across the heater?

6. What current will an electric motor draw from a 250 V source if it is developing mechanical energy at the rate of 5 hp at 90% efficiency?

7. What mechanical work can be done by a 75% efficient electric motor drawing 2 A from a 120 V source for 8 h?

8. The armature winding of an electric motor has a resistance of 0.2 ohm. At what rate is electric energy being used up by this particular motor loss when the armature current is 40 A?

9. How many joules of heat are produced in 1 h in the winding of a motor which has a power loss of 320 W?

10. If 250,000 joules of electric energy are supplied to the motor operating an elevator which raises a total mass of 5 tonnes through 45 m, what is the efficiency of the system?

Circuit Theory Question Paper

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