Reference no: EM13865345
1. Determine the tension in the cable, and sidewall pressure where applicable for four 300 kcmil XHHW-2 single conductor copper cables installed in 3" rigid steel conduit under the following conditions. Assume a tension equal to 100 lb at the input to the conduit section, and a weight correction factor of 1.4 for all calculations. (CH 8)
a) 300 ft straight pull
b) 25 ft pull up 45 inclune
c) pull around 90 sweep, 24" radius
2. Determine the minimum trade size rigid steel conduit required to accommodate four 300 kcmil THW copper conductors and one #2/0 AWG (0.1379 in2) bare copper ground conductor. (CH 8)
3. A residence supplied by a 120/240V, single phase, three wire service has a total estimated demand load of 25,000 VA. The total estimated neutral loading is 17,000 VA. Determine the service over-current protection HHW aluminum conductor, 75° C device terminal ratings, and allow 25% load growth. (CH 9)
4. Determine the percent imbalance for a 120/240V, 3-phase, 4-wire panel having 135 A, 105 A, and 75 A phase currents, respectively. Is this acceptable? What is the solution? (CH 11)
5. What is the required rating of a standard disconnect used for a 50 HP, 460 V, design E motor having a nameplate current of 72 A? (CH 13)
6. A 225 kVA, 12.47 kV - 480Y/277 V 3-phase transformers has an impedance of 2.7% and an X/R ratio of 1.8. Determine the ohmic resistance and reactance of the transformer referred to the low voltage side. (CH 14)
7. An industrial plant is supplied service at 480Y/277 V, 3-phase, 4-wire. The plant has an active power demand of 1200 kW @ PF= 0.80 lagging. Determine: (CH 15)
a) apparent power demand
b) reactive power demand
c) line current magnitude
d) rating of the capacitor bank required to improve power factor at 0.95 lagging
e) active, reactive and apparent power after addition of the capacitors
f) line current magnitude after addition of the capacitors
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Moderate and high graphics output in the sample.
: A small- business web site contains 199 pages and 60% , 30% and 10% of the pages contain low, moderate, and high graphic content, respectively. A sample of four pages is selected without replacement,and X and Y denote the number of pages with moderat..
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New pressure test system for coolant hoses
: A group of Mr. Lugwrench engineers spent 4 years and $50,000 to develop a new pressure test system for coolant hoses with the Old Faceful Corporation. Purchasing quoted the system out, and two systems are being considered - Old Faceful and Blowi..
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Calculate the time evolution for a population of burning par
: Calculate the time evolution for a population of burning particles. Assume that the surface area burning rate, f, is 0.5 mm2 /min. Assume a diameter interval Di = 0.2 mm centered around the following diameters di with specified fuel feed rate dist..
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Explain effectiveness of resistance management techniques
: An Assessment of the Effectiveness of Resistance Management Techniques to the Implementation of Anticipated Organisational Change, a case study of south oil company in Iraq.
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Determine the minimum trade size rigid
: Determine the minimum trade size rigid steel conduit required to accommodate four 300 kcmil THW copper conductors and one #2/0 AWG (0.1379 in2) bare copper ground conductor. (CH 8)
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Agriculture and food supply
: Step 1: Search the Internet for information about the types of agriculture that are most commonly practiced in the place (i.e., country) that you have selected for your portfolio project for this semester and its impact on the environment.
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Making a layout of office building
: Location: Proposed Land extends 1500o north along Cody Street and 600o east along Old shell road.
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Explain how focus groups were developed
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Learned about leadership development
: (a) Now that you have learned about leadership development and coaching, describe how you will apply this in your own life.(b) Create one actionable goal for you to develop as a coach in your chosen career field. Be sure that your goal meets the crit..
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