McqMate

Q. |
## Whenever heat is transferred through a finite temperature difference, there is always a decrease in the availability of energy so transferred. |

A. | true |

B. | false |

Answer» A. true |

956

0

Do you find this helpful?

1

View all MCQs in

Engineering ThermodynamicsNo comments yet

- Energy is said to be degraded each time it flows through a finite temperature difference.
- If solar energy Qr is available at a reservoir storage temperature of Tr and if quantity of heat Qa is transferred by the solar collector at temperature Ta, then which of the following is true?
- A heat engine is supplied with 250 kJ/s of heat at a constant fixed temperature of 227°C. The heat is rejected at 27°C. The cycle is reversible, if the amount of heat rejected is
- An inventor claims that a new heat cycle will develop 0.4 kW for a heat addition of 32.5 kJ/mm. The temperature of heat source is 1990 K & that of sink is 850K. Is his claim true?
- The unavailable energy is the product of the lowest temperature of heat rejection and the change of entropy of system during the process of supplying heat.
- In a cyclic heat engine operating between a source temperature of 600°C & a sink temperature of 20°C, the least rate of heat rejection per kW net output of the engine is
- When the heat transferred isothermally between the given decreases, the temperature
- When considering a finite energy source, its working fluid expands,
- One reversible heat engine operates between 1600 K & T₂ K & another reversible heat engine operates between T₂ K & 400 K. If both the engines have the temperature T₂ must be equal to
- During a polytropic expansion 25% of heat is converted into work while temperature of gas rises by 30 K, the specific heat of gas at constant volume is