Engineering Thermodynamics - Study Mode
[#126] When a gas is heated at constant pressure
Correct Answer
(C) Both temperature and volume will increase
[#127] The fuel mostly used in steam boilers is
Correct Answer
(D) Non-coking bituminous coal
[#128] Water contained in a beaker can be made to boil by passing steam through it
Correct Answer
(B) At a pressure greater than atmospheric pressure
Explanation
Solution: The boiling point of a liquid is the temperature at which its vapor pressure is equal to the atmospheric pressure. When steam is passed through water, it heats the water, and if the pressure of the steam is greater than the atmospheric pressure, it can make the water boil even at a temperature below 100°C (the boiling point of water at atmospheric pressure). This phenomenon is utilized in various industrial processes, such as in steam generators and pressure cookers. When steam is supplied at a pressure higher than atmospheric pressure, the water in the beaker can be made to boil even at a temperature higher than 100°C. Among the options provided, the correct answer is Option B: At a pressure greater than atmospheric pressure . This is because boiling at a pressure higher than atmospheric pressure allows the water to reach its boiling point at a temperature higher than 100°C. Therefore, the correct answer is Option B: At a pressure greater than atmospheric pressure .
[#129] For which of the following substances, the internal energy and enthalpy are the functions of temperature only
Correct Answer
(D) Perfect gas
[#130] The mass of flue gas per kg of fuel is the ratio of the
Correct Answer
(C) Mass of carbon in 1 kg of flue gas to the mass of carbon in 1 kg of fuel