As transformer ratings are always in KVA or MVA
For 3 phase rating (S) is
S= root3VI= 1.732*480*1200
S= 997.661KVA or 0.9976MVA
Not yet answered Points out of 10.00 P Has question A commercial building in downtown Portland,...
A commercial building in downtown Portland, OR has a three-phase, 480 volt, 1200 ampere service. What is the required transformer size needed for this building? Make sure to show your work A
Question 3 Not yet answered Points out of 10.00 P Flag question A building has a 40kW load using a 240V AC three-phase system. a) What is the total current needed for this system if the PF is 0.8? b) Based on the current calculated in part a, what size conductor is needed for this system if the feeder is to be aluminum rated for 90°C? c) If the service for this building is from underground, what type of conductor...
Question 4 Not yet answered Points out of 10.00 P Flag question A commercial building has the following electrical design: Lighting System (Demand Factor = 0.75): Indoor lighting = 2.5kW 120V single-phase; Outdoor lighting = 3kW 120V single-phase Heating System (Demand Factor = 0.60): Electric Furnance - 17,000 btuh 240V single-phase • Convenience Power (Demand Factor = 0.35): 50 duplex outlets rated at 1.5A 120V single phase • Include 20% spare circuits for future expansion • The system has a...
Question 2 Not yet answered Points out of 10.00 P Flag question A transformer has an incoming service of 7,200 volts. If the primary coil has 75 turns and the secondary coil has 15 turns, what is the outgoing voltage from this transformer? Also, please state if this is a step-up or step-down transformer. FT: BE
P Flag question Question 12 Not yet answered Points out of 2.00 A building has a three-phase, 277 volt service. If the total working power is 364kW with a power factor of 0.95, what is the total current? Select one: O a. 720kW b. 800A O c. 384 kW O d. 1385A e. None of these
Question 6 Not yet answered p Flag question Calculate the apparent power in kVA for a 200 amp, 120/208 volt, 3-phase service. Points out of 2.00 Select one: a. 432 kVA O b. 576 kVA O c. 769 kVA O d.72 kVA
Not yet answered Points out of 10.00 P Flag question A particle with mass 2.0 kg is initially at rest at the origin (x=0). It then moves along the x-ax acted on by a force F(x)=9.0-3.0x, where F is in Newtons if x is expressed in meters. Find the kinetic energy of the particle when it reaches x=3m. Select one 6.8 J 13,5 J OOJ 9.03 54.0 F2 ] H
Question 2 Not yet answered Points out of 10.00 P Flag question A first order process is found to have a rate constant of 32.3 s-1. How long does it take for the reactant concentration to decrease to one-fifth (1/5)? Select one: O A. 67.2 s OB. 0.00691 s OC. 0.223 s OD. 7.21 s O E. 0.0644 s Previous page Next page
Question 7 Not yet answered Points out of 3.00 P Flag question ESAL an acronym for Equivalent Single Axle Load Select one: True False Question 8 Not yet answered Points out of 3.00 p Flag question A pycnometer measures grain size. Select one: True False
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