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 $
$ \therefore $ Energy produced $ =2kcal/s $
Input power $ =2kcal/s=2000cal/s $
$ =2000\times 4.18 J/s=8.4kW $
$ \therefore $ This claim is invalid.
