Embibe Experts Solutions for Chapter: Thermodynamics, Exercise 5: BEGINNER'S BOX - 5

An ideal engine which works between 27ºC & 227ºC takes 100 calorie of heat in one cycle. Calculate the work done in one cycle?

The coefficient of performance of a carnot refrigerator is $\frac{5}{3}$. If the refrigerator operates at an intake temperature of $-23°\mathrm{C}$, what will be the exhaust temperature?

A Carnot engine absorbs $1000 \mathrm{J}$ of heat from a reservoir at $127°\mathrm{C}$ and rejects $600 \mathrm{J}$ of heat during each cycle. Calculate the efficiency of the engine, $\left(\mathrm{i}\mathrm{i}\right)$ temperature of the sink and, $\left(\mathrm{i}\mathrm{i}\mathrm{i}\right)$ amount of useful work done during each cycle.

Two carnot engines $A \text{and} B$ use one after another. Engine $A$ absorb heat from source at, $T_1=800 \mathrm{K}$ and release heat to sink of temperature $T_2 \mathrm{K}$. Second engine $B$ absorb heat which is released by first (at $T_2 \mathrm{K}$) and release heat at another sink at temperature, $T_3=300 \mathrm{K}$. If work done by two engine is same, calculate the value of $T_2$.

A carnot engine has an efficiency of $40\%$ and temperature of sink is $300 \mathrm{K}$. To increase efficiency up to $60\%$, calculate the change in temperature of source?

An ideal refrigerator is working between temperatures $27°\mathrm{C} \text{and} 127°\mathrm{C}$. If it expells $120 \mathrm{calorie}$ of heat in one second, then calculate its wattage.