An ideal heat engine exhausting heat at ${77^o}C$ is to have a $30\%$ efficiency. It must take heat at ...... $^oC$
Medium
Download our appand get started for free
Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*
Similar Questions
- 1Following figure shows two processes $A$ and $B$ for a gas. If $\Delta Q_A$ and $\Delta Q_B$ are the amount of heat absorbed by the system in two cases, and $\Delta U_A$ and $\Delta U_B$ are changes in internal energies, respectively, thenView Solution
- 2During an experiment, an ideal gas is found to obey a condition $\frac{{{P^2}}}{\rho }$ = constant [$\rho =$ density of the gas]. The gas is initially at temperature $T,$ pressure $P$ and density $\rho$ . The gas expands such that density changes to $\rho/2$View Solution
- 3The pressure $P_{1}$ and density $d_{1}$ of diatomic gas $\left(\gamma=\frac{7}{5}\right)$ changes suddenly to $P _{2}\left(> P _{1}\right)$ and $d _{2}$ respectively during an adiabatic process. The temperature of the gas increases and becomes $......$ times of its initial temperature.$\left(\right.$ given $\left.\frac{ d _{2}}{ d _{1}}=32\right)$View Solution
- 4View SolutionWhich of the following laws of thermodynamics defines the term internal energy?
- 5The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is ........ $\%$View Solution
- 6A Carnot engine whose sink is at $300 \,K$ has an efficiency of $50 \%$. By how much should the temperature of source be increased so as the efficiency becomes $70 \%$ is ............ $K$View Solution
- 7This question has Statement $1$ and Statement $2.$ Of the four choices given after the Statements, choose the one that best describes the two Statements.View Solution
Statement $1:$ In an adiabatic process, change in internal energy of a gas is equal to work done on/by the gas in the process.Statement $2 :$ The temperature of a gas remains constant in an adiabatic process.
- 8A thin piece of thermal conductor of constant thermal conductivity insulated on the lateral sides connects two reservoirs which are maintained at temperatures $T_{1}$ and $T_{2}$ as shown in the figure alongside. Assuming that the system is in steady state, which of the following plots best represents the dependence of the rate of change of entropy on the ratio of $T_{1} / T_{2}$ ?View Solution
- 9The amount of work done in an adiabatic expansion from temperature $T$ to ${T_1}$ isView Solution
- 10Consider the following volume-temperature $( V - T )$ diagram for the expansion of $5$ moles of an ideal monoatomic gas.View Solution
Considering only $P-V$ work is involved, the total change in enthalpy (in Joule) for the transformation of state in the sequence $X \rightarrow Y \rightarrow Z$ is $\qquad$
[Use the given data: Molar heat capacity of the gas for the given temperature range, $C _{ v , m }=12 J K ^{-1} mol ^{-1}$ and gas constant, $R =8.3 J K ^{-1} mol ^{-1}$ ]
