Business Driven Information Systems
Business Driven Information Systems
6th Edition
ISBN: 9781260004717
Author: Paige Baltzan
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 5, Problem 1RQ
To determine

The frequency in which a business should backup their data.

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Exhaust gas from a power plant passes through a 15-by-20-it rectangular duct at an average velocity of 50 ft/s. The total length of duct is 250 ft and there are two 90° bends.The gas is at 180°F and about 1 atm, and the properties are similar to those of air. Calculate the pressure drop in the duet and the power required to overcome pressure losses.
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5. Three single-phase transformers rated at 250 kVA, 7200 V/600 V, 60 Hz, are connected in wye-delta on a 12470 V, 3-phase line. If the load is 450 kVA, calculate the following currents: (1) In the incoming and outgoing transmission lines (2) In the primary and secondary windings (3) If this transformer is used to raise the voltage of a 3-phase, 600 V line to 7.2 kV. (a) How must they be connected? (b) Calculate the line currents for a 600 kVA load. (c) Calculate the corresponding primary and secondary currents.
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