Advertisements
Advertisements
प्रश्न
Efficiency of a Carnot engine is large when ______.
पर्याय
TH is large
Tc is low
TH – Tc is large
TH – Tc is small
उत्तर
Efficiency of a Carnot engine is large when TH – Tc is large.
Explanation:
`eta = 1 - T_C/T_H`
`eta = (T_H - T_C)/T_H`
Where:
- TH = Temperature of the hot reservoir (in Kelvin),
- TC = Temperature of the cold reservoir (in Kelvin).
Key Factors:
- Large TH: Increasing the temperature of the hot reservoir increases the efficiency because more heat energy is available for conversion into work.
- Small TC: Decreasing the temperature of the cold reservoir increases the efficiency as less energy is wasted in the form of heat rejected to the cold reservoir.
- Larger Temperature Difference (TH − TC): A greater temperature difference between the reservoirs enhances efficiency.
APPEARS IN
संबंधित प्रश्न
The efficiency of a Carnot cycle is 75%. If the temperature of the hot reservoir is 727°C, calculate the temperature of the cold reservoir.
A Carnot refrigerator operates between 250°K and 300°K. Calculate its coefficient of performance.
A system is taken to its final state from initial state in hypothetical paths as shown figure calculate the work done in each case.
The specific heat of hydrogen gas at constant pressure is Cp = 6.4 x 103 cal/kg °C and at constant volume is Cv = 4.4 x 103 cal/kg °C. If one kilogram of hydrogen gas is heated from 10 °C to 20 °C at constant pressure, the external work done on the gas to maintain it at constant pressure is ______.
The work of 146 kJ is performed in order to compress one-kilo mole of a gas adiabatically and in this process the temperature of the gas increases by 7 °C. The gas is ______.
(R = 8.3 J mol-1 K-1)
A Carnot engine operating between temperatures T1 and T2 has efficiency 0.2. When T2 is reduced by 50 K, its efficiency increases to 0.4. Then T1 and T2 are respectively ______.
A Carnot engine whose low temperature reservoir is at 7°C has an efficiency of 50%. It is desired to increase the efficiency to 70%. By how many degrees should the temperature of the high temperature reservoir be increased?
