Work Energy And Power Question 268

Question: An engineer claims to have made an engine delivering 10kW power with fuel consumption of 1 g/s. The calorific value of fuel is 2 kcal/g. This claim is

Options:

A) Valid

B) Invalid

C) Depends on engine design

D) Dependent on load

Show Answer

Answer:

Correct Answer: B

Solution:

[b] P=10kW=10000W

Fuel consumption =1g/s

Calorific value =2kcal/g

Energy produced =2kcal/s

Input power =2kcal/s=2000cal/s

=2000×4.18J/s=8.4kW

This claim is invalid.



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