Home › CBSE Class 11 › Physics › Mechanical Properties of Fluids › A Carnot engine works between $T_h = 400$ K and …
A Carnot engine works between $T_h = 400$ K and $T_c = 300$ K. Its efficiency is:
A$50\%$, the simple average shortcut here
B$75\%$, the ratio of cold to hot temperatures
C$33\%$, dividing the difference by cold temperature
D$25\%$, since $\eta = 1 - 300/400 = 0.25$
Answer & Solution
Correct answer: D. $25\%$, since $\eta = 1 - 300/400 = 0.25$
$\eta = 1 - T_c/T_h = 1 - 0.75 = 0.25 = 25\%$.
Related questions
A wet paint brush forms a fine tip when lifted from water. This is due to:Surface tension is a property of:Honey needs a bigger force than oil to slide a plate at the same speed. Honey is more:Plaque narrows an artery, blood speeds up there and pressure drops. The artery may:Water leaves a hole in an open tank at the speed of a freely falling body. This is:Above a limiting speed called the critical speed, flow becomes:Where a pipe narrows and streamlines crowd together, the fluid speed:The equation of continuity, Av = constant, expresses conservation of: