Question

The chart shows data for four heat engines.

Answer 1

Answer:

C.) Z, X,W, Y

Answer 2

efficiency of the heat engine is calculated by the formula

$\eta = 1- \frac{T_c}{T_h}$

here we know that

$T_c$ = cold temperature

$T_h$ = hot temperature

now we will find the efficiency of all

1) for W

$\eta_1 = 1- \frac{T_c}{T_h}$

$\eta_1 = 1- \frac{120}{620}$

$\eta_1 = 0.806$

2) for X

$\eta_2 = 1- \frac{T_c}{T_h}$

$\eta_2 = 1- \frac{100}{840}$

$\eta_2 = 0.88$

3) For Y

$\eta_3 = 1- \frac{T_c}{T_h}$

$\eta_3 = 1- \frac{300}{900}$

$\eta_2 = 0.67$

4) for Z

$\eta_4 = 1- \frac{T_c}{T_h}$

$\eta_4 = 1- \frac{25}{500}$

$\eta_4 = 0.95$

So here most efficient engine is Z and least is Y

so we can arrange it as

Z > X > W > Y

so 3rd option is correct here