l9answer 7 and 8 7. The illumination in a room is being designed, the data areas follows:Room length - 30 ftCoefficient of utilization (n) = 0.60- 70%Required foot-candle - 50Watts per lamp - 53Power factor 75%What is the total current of the lamps required to satisfythe requirements? (EEa. 21 Amperesb. 7 AmperesRoom width - 2- ItMaintenance factor (P)Lumens per lamp = 3300Supply Voltage - 220vBoard prob. Mar. '98)с. 15 Аmрeresd. 25 Amperes8. An air-cooled searchlight bulb has an efficiency of 251m/watt the searchlight is powered by a generator ofefficiency 80% to which power is supplied by a belt passingaround a pulley of 16 cm diameter. If the difference intension of the two portions of the belt is 98 Newton.Calculate the angular speed of the generator required togive 40 lux of illumination on the ground. The reflectorsystem of the searchlight concentrates all the light into acircle on the ground 50 m in diameter.a. 60 rev/secb. 80 rev/secc. 75 rev/secd. 65 rev/sec

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7. The 1llumination in a room is being designed, the data are as follows: Room width - 2- It Maintenance factor (P) Room length - 30 ft Coefficient of utilization (n) - 0.60 - 704 Required foot-candle - 50 Watts per lamp - 53 Power factor 75% Lumens per lamp - 3300 Supply Voltage - 220v What is the total current of the lamps required to satisfy the requirements? (EE a. 21 Amperes b. 7 Amperes c. 15 Amperes d. 25 Amperes Board prob. Ma r. '98)

7. The 1llumination in a room is being designed, the data are as follows: Room width - 2- It Maintenance factor (P) Room length - 30 ft Coefficient of utilization (n) - 0.60 - 704 Required foot-candle - 50 Watts per lamp - 53 Power factor 75% Lumens per lamp - 3300 Supply Voltage - 220v What is the total current of the lamps required to satisfy the requirements? (EE a. 21 Amperes b. 7 Amperes c. 15 Amperes d. 25 Amperes Board prob. Ma r. '98)

EBK ELECTRICAL WIRING RESIDENTIAL

19th Edition

ISBN:9781337516549

Author:Simmons

Publisher:Simmons

Chapter3: Determining The Required Number Of Branch Circuits, Lighting Outlets, And Receptacle Outlets

Section: Chapter Questions

Problem 31R

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