Engineering Thermodynamics - Study Mode
[#76] A perfect gas at 27°C is heated at constant pressure till its volume is double. The final temperature is
Correct Answer
(B) 327°C
[#77] The amount of heat required to raise the temperature of __________ water through one degree is called kilojoules.
Correct Answer
(D) 1000 g
Explanation
Solution: The amount of heat required to raise the temperature of 1000 g (or 1 kg) of water through one degree Celsius is called a kilojoule. This is because the specific heat capacity of water is approximately 4.186 kJ/kg°C , meaning that 1 kg of water requires about 4.186 kJ to increase its temperature by 1°C. The smaller masses such as 1 g, 10 g, or 100 g would require proportionally less heat energy.
[#78] For the constant pressure and heat input, the air standard efficiency of gas power cycle is in the order
Correct Answer
(A) Dual cycle, Diesel cycle, Otto cycle
[#79] The __________ states that change of internal energy of a perfect gas is directly proportional to the change of temperature.
Correct Answer
(D) Joule's law
[#80] Select the wrong statement
Correct Answer
(A) A Joule cycle consists of two constant volume and two isentropic processes.