A work area at bench level is to be illuminated to a value of 300 lux, using 85W single fluorescent fittings having an efficacy of 80 lumens/watt. The work area is 10m X8 m, the MF is O.8 and CU is 0.6. Calculate the following (a) Total Wattage? (b) Total Lumen for the Fixtures? (c) No. of Fixtures?
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- 8. Parallel conductors must be installed in sizes no smaller thanA. 1/0.B. 2/0.C. 750 kcmil.D. 4/0.If the charging resistor was twice as large as the discharging resistor in Figure 4, theamplitudes of the charging and discharging waveforms would be ________.a. The sameb. DifferentWe are running 3 wires and a ground in a RMC to a control panel with a 60 amp circuit breaker disconnect in the control panel. The conduit is run along the ceiling where the ambient air temperature is 100 degrees. The control panel feeds our secondary cooling pump. What size are the ungrounded conductors? All conductors have typeTHHN insulation. A #6 AWG B 600 Kcmil C #8 AWG D #2 AWG What size RMC do we need? A 3" B 3/4" C 1" D 1 1/2"
- 2.a. Four electricians are discussing the installation of a luminaire in a clothes closet. Electrician A says thatbecause the clothes-hanging rod is located five inches from the ceiling, the light fixture that's to be mounteddirectly over the rod must be recessed. Electrician B says that a surface-mounted incandescent fixture mustbe placed at least six inches from the storage area. Electrician C says that a surface-mounted incandescentfixture must be placed at least 12 inches away from the storage space. Electrician D says that a surfacemounted incandescent fixture must be placed at least nine inches away from the storage space. Which ofthe following statements is correct?A. Electrician C is correct.B. Electrician A is correct.C. Electrician B is correct.D. Electrician D is correct. 2.b. Four electricians are discussing NEC requirements for common appliances. Electrician A says that new,cord-and-plug, single-phase room A/C units must have factory-installed LCDI or AFCI…BASIC ELECTRICAL ENGINEERING UPVOTE WILL BE GIVEN. PLEASE WRITE THE COMPLETE SOLUTIONS LEGIBLY. NO LONG EXPLANATION NEEDED. ANSWER IN 4 DECIMAL PLACES. BOX THE FINAL ANSWER. Substation 2A have a busbar made of aluminum with a length of 5 meters and a cross sectional areais 4x3 sq. cm. The resistivity of the Aluminum at 20 DegC is 2.82x10-8 ohm-m. Determine theresistance of the busbarLoad in Figure 1 needs to be connected to Mains Switch Board (MSB) using multicore PVC cable. As a maintenance engineer, you need to proposed cable size for the load, Determine the following issues. 1) Calculate current demand for the circuit. 1) Detemine suitable MCCB (Model and nominal current rating) should be used to protect the load against over-current. im Propose suitable cable size for the load in Figure 1. iv) Calculate voltage drop of the proposed cable WITHOUT consider the cable reactance and voltage drop correction due to higher cable operating temperature v) Calculate voltage drop of the proposed cable BY consider the cable reactance and voltage drop correction due to higher cable operatıng temperature vi) If the multicore PVC eable is change into 3 single core PVC cables, what the suitable cable size. All other multicore cables not available. (25 + variable x) m (A) 30 m (B) (15 + variable b) m (C) Multicore PVC cable MCCB 95 kW. (400 + variable y) V. 0.85 p.f. Load MSB…
- leaving a freevway. Current from the opposite side must travel further, weakening the potential on that side. This creates a potent the motor in that direction, causing the motor to spin. O Only the side where the switch is closed forms a cormplete circuit, so the motor must spin in that direction. Answer the questions and submit the photos for questions 2 -9using the circuit from STEP 2. D2 Yellow R1 50 Q R2 50 0 R3 PSB (+ 5 V 100 aLW R4 D1 100 Q Blue SW1 Sw2 Question 2 本2. A facility manager replaces all the TS lights in an office when they have reached 80% of their rated life of 20,000 hours. The lights operate for 12 hours each day, 5 days per week for 52 weeks of the year. What is the group re-lamping interval for these lights? a. 3.7 years b. 4.6 years c. 5.1 years d. 6.4 yearsMost residential general lighting circuits are wired with 14-AWG copper conductors and are protected by 15-amp circuit breakers. However, there are many electricians who install 12-AWG copper conductors and protect them with 20-amp circuit breakers. How will you know which conductor size and which circuit breaker size will be used for the general lighting branch circuits in the house you are wiring?
- F.1. Which of the following terms does not describe one of the uses of an MR lamp?A. Display lightingB. A narrow spotC. An extra wide floodD. Accent lightingF.2. If you operate a 130 V lamp in a 120 V service, the lamp life willA. immediately be terminated.B. increase.C. stay the same.D. decrease.F.3. Which of the following lamps does not require a ballast to operate?A. A mercury lampB. An incandescent lampC. A metal halide lampD. A high-pressure sodium lampThree types of electric devices A, B, and C are connected in series across a 115-volt ac source, and the voltage drops across the individual units are equal. If EB leads EA by 90 elec deg and EC lags behind EA by 90 elec deg, what are the emfs across A, B, and C?1. Bus bars in electrical substation are made of aluminum because it has i Low cost ii. Low Density ii. High Resistivity iv. Low Melting Point 2. is the greatest demand of load on the power station, during a given period. 3. The arc resistance in circuit breakers doesn't depend on i. Length of Arc ii. Degree of Ionization iii. Cross section of the Arc i. Cross section of the Conductor 4. List out any two limitations of fuse. 5. A 2-wire DC ring distributor is 375m long and is fed with 300V at point A. At point B, 200m from A, load of 150A is taken and at point C, 100m in the opposite direction, a load of 100A is taken. If the resistance per 100m of single conductor is 0.03, find: i. Current in each section of distributor iü. Voltage at points B and C ii. Point of minimum potential