5. A 25 MVA turbo-alternator is working on full load at a power factor of 0-8 and efficiency of 97%. Find the quantity of cooling air required per minute at full load, assuming that 90% of the total losses are dissipated by the internally circulating air. The inlet air temperature is 20° C and the temperature rise is 30° C. Given that specific heat of air is 0-24 and that 1 kg of air occupies 0-8 m². 1890 m/minute] 6. A thermal station has an efficiency of 15% and 1-0 kg of coal burnt for every kWh generated. Determine the calorific value of coal 15733 kcal/kg|

Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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5. A 25 MVA turbo-alternator is working on full load at a power factor of 0-8 and efficiency of 97%. Find
the quantity of cooling air required per minute at full load, assuming that 90% of the total losses are
dissipated by the internally circulating air. The inlet air temperature is 20° C and the temperature rise is
30° C. Given that specific heat of air is 0-24 and that 1 kg of air occupies 0-8 m². 1890 m/minute]
6. A thermal station has an efficiency of 15% and 1-0 kg of coal burnt for every kWh generated. Determine
the calorific value of coal.
15733 kcal/kg|
Transcribed Image Text:5. A 25 MVA turbo-alternator is working on full load at a power factor of 0-8 and efficiency of 97%. Find the quantity of cooling air required per minute at full load, assuming that 90% of the total losses are dissipated by the internally circulating air. The inlet air temperature is 20° C and the temperature rise is 30° C. Given that specific heat of air is 0-24 and that 1 kg of air occupies 0-8 m². 1890 m/minute] 6. A thermal station has an efficiency of 15% and 1-0 kg of coal burnt for every kWh generated. Determine the calorific value of coal. 15733 kcal/kg|
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