Question

an engine has an input temperature of 653 K and an exhaust temperature of 312 K. determine the efficiency of the engine

Answer 1

52.2%

Step-by-step explanation:

Efficiency= output temperature/ input temperature

output temperature= input temperature-exhaust temperature

so, 653 K - 312 K = 341 K

341 K / 653 K = 52.2%

I got the answer correct on the online quiz.

Answer 2

48%

Step-by-step explanation:

Efficiency is calculated using the formula

Efficiency =
`(W_(out))/(W_(in))*100%`%

W out is the work output. W in is the work input.

Input is the energy that was used, output is the energy that resulted.

W out = 312 K

W in = 653 K

Substitute the values into the formula.

Efficiency =
`(W_(out))/(W_(in))*100%`%

Efficiency =
`(312K)/(653K)*100%`% Divide the fraction, then multiply by 100.

Efficiency = 47.779....% Exact answer

Efficiency ≈ 48% Rounded to nearest whole percentage

If the question does not say what decimal place to round to, you can round to the number of decimal places that are in the numbers they give you. "312" and "653" have no decimal places.

Therefore the efficiency of the engine is about 48%.