Electrical Engineering Answers

A 12 V battery of 0.05-ohm resistance and

another battery of 12 V and 0.075-ohm resistance

supply power to a 2-ohm resistor. What is the

current through the load?

A given wire has a resistance of 17.5 ohms. If its length is 560 m, how much length must be cut – off from the wire in order to reduce its resistance to 12.5 ohms?

A telephone cable 64 km long has a resistance of 13 ohms/km and a capacitance of 0.008 micro farad/km. Calculate attenuation constant, velocity and wavelength of the line at 1000 HZ.

a) Calculate the number of lamps required, the wattage of each lamp, and the proper

distribution of the lamps of your house. Your calculation will depend on-

• No of Rooms/Spaces in your house
• Name or Type of Rooms
• Area of Your Rooms/Spaces
• Maintenance Factor: 0.75 [Let]
• Utilization Factor: 0.5 [Let]
• Space to Height Ratio: Between 1 and 1.5 [Select based on your selected light or

assumption]

• Other information if needed (May take reference of BNBC 2020 or internet)

b) Calculate the illumination generated in each room/space by your existing lighting

setup of your house.

c) Compare results of (a) and (b). Comment on the results.

a) Calculate the number of lamps required, the wattage of each lamp, and the proper

distribution of the lamps of your house. Your calculation will depend on-

1. No of Rooms/Spaces in your house

2. Name or Type of Rooms

3. Area of Your Rooms/Spaces

4. Maintenance Factor: 0.75 [Let]

5. Utilization Factor: 0.5 [Let]

6. Space to Height Ratio: Between 1 and 1.5 [Select based on your selected light or

assumption]

7. Other information if needed (May take reference of BNBC 2020 or internet)

b) Calculate the illumination generated in each room/space by your existing lighting

setup of your house.

c) Compare results of (a) and (b). Comment on the results.