


$1.$ efficiency more than $27 \%$
$2.$ efficiency less than the efficiency a Carnot engine operating between the same two temperatures.
$3.$ efficiency equal to $27 \%$
$4.$ efficiency less than $27 \%$

Let $\Delta v=X$ cc and $\Delta p=Y \times 10^3 Pa$.
($1$) The value of $X$ is
($2$) The value of $Y$ is
Give the answer or quetion ($1$) and ($2$)