Problem 18 %. The overall efficiency of an electric system, coal pile to lights a lamp is What fraction of a kg of coal containing 10250 KJ/kg must be consumed to light a 1350 W lamp for 45 minutes? Ans. 1.976 KJ

Problem 18 %. The overall efficiency of an electric system, coal pile to lights a lamp is What fraction of a kg of coal containing 10250 KJ/kg must be consumed to light a 1350 W lamp for 45 minutes? Ans. 1.976 KJ

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.75P: Referring to Problem 1.74, how many kilograms of ice can a 3-ton refrigeration unit produce in a...

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Question

Problem
18 %.
The overall efficiency of an electric system, coal pile to lights a lamp is
What fraction of a kg of coal containing 10250 KJ/kg must be consumed to light a
1350 W lamp for 45
minutes?
Ans.
1.976 KJ

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