Question

The efficiency of engine working between 100 to 400K...........
a.25%
b.75%
c.100%
d.50%​

Answer 1

Answer: b) 75

Explanation: because you are a boy of svs from dav (Don)

Answer 2

answer : option (b) 75%

explanation : percentage efficiency of engine , $\eta=\frac{T_2-T_1}{T_2}\times100$

where $T_1$ is the temperature of cold reservoir and $T_2$ is the temperature of hot reservoir.

here, $T_1$ = 100K, $T_2$ = 400K

so, efficiency of engine = (400 - 100)/(400) × 100

= 300/400 × 100

= 300/4

= 75%

hence, option (b) is correct choice.