A geared turbine unit delivers 18500 kw at the bull gear coupling at full power with a propeller shaft speed of 400 rpm. Under these conditions, the mechanical losses total 925 kw. At 35km/hr, the propeller makes 200 rpm and the shaft power is 2000 kw. Assume the mechanical losses vary as the square of the rpm and a) find the mechanical efficiency of the unit at full power b) find the estimated mechanical efficiency at this speed.

A geared turbine unit delivers 18500 kw at the bull gear coupling at full power with a propeller shaft speed of 400 rpm. Under these conditions, the mechanical losses total 925 kw. At 35km/hr, the propeller makes 200 rpm and the shaft power is 2000 kw. Assume the mechanical losses vary as the square of the rpm and a) find the mechanical efficiency of the unit at full power b) find the estimated mechanical efficiency at this speed.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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45. A geared turbine unit delivers 18,500 kW at the bull gear coupling at full power with a propeller shaft speed of 400rpm. Under these conditions, the mechanical losses total 925 kW. At 35 km/hr, the propeller makes 200 rpm and the shaft power is 2000 kW. Assume the mechanical losses vary as the square of the rpm and find the estimated mechanical loss power at 35 km/hr. A. 321 kW B. 231 kW C. 124 kW D. 432 kW
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