FREE Bachelor of Mechanical Engineering Thermodynamics Questions and Answers
Which of the following is a thermodynamics application?
All refrigerators, deep freezers, commercial refrigeration systems, all types of air conditioning systems, heat pumps, and other devices are subject to the second law of thermodynamics. All types of air and gas compressors, blowers, and fans run on thermodynamic cycles. An essential area of thermodynamics is the investigation of the viability of using various renewable energy sources for residential and commercial applications.
Which of the subsequent motion types does Shaft use when working?
Work transfer occurs into the system when a motor rotates a shaft.
Which of the following determines the engine's mechanical efficiency?
Braking power is less than advertised power, and BP/IP provides mechanical efficiency.
In relation to temperature, the enthalpy and internal energy are a
Because an ideal gas's internal energy is solely dependent on temperature, the enthalpy of an ideal gas also depends only on temperature.
Which of the following is selected as the reference material for thermometers?
The least amount of fluctuation is seen between various gas thermometers.
What exactly is thermodynamics?
This area of physical science is focused on how heat interacts with many types of energy, including mechanical, electrical, chemical, and others.
A system's heat input and output are denoted by the symbols __ and ________, respectively.
The high-temperature system transfers heat in the opposite direction, toward the low-temperature system.
What does the absolute thermodynamic temperature scale represent?
Absolute temperature, often called thermodynamic temperature, is the temperature of an object on a scale with 0 as absolute zero. Absolute temperature scales include Kelvin and Rankine.
A cooler body cannot voluntarily give off heat to a hotter one. Which of the following statements about thermodynamics is true?
The second law of thermodynamics establishes the idea of entropy as a physical characteristic of a thermodynamic system. Even though the first law of thermodynamics states that energy must be conserved, entropy predicts the course of spontaneous events and establishes whether they are irreversible or impossible.
Which of the following statements best describes a thermodynamics law?
The main principles of thermodynamics are based on a set of four laws that, when applied to systems that fall within each law's bounds, are universally valid. These are what they are: The first law of thermodynamics, the second law of thermodynamics, and the third law of thermodynamics all apply.
Which of the following laws of thermodynamics defines enthalpy?
The first law of thermodynamics establishes a link between a system's many forms of kinetic and potential energy and the amount of work and heat it may produce. There are times when internal energy is defined using this law, which also has an additional state variable called enthalpy.
What should the water pressure be to lift a piston with an outside pressure of 100 kPa if the piston has a cross sectional area of 0.01 m2 and is resting on the stops?
Pw = Po plus mg/A equals 100000 plus (100*9.8/0.01), or 198kPa.
Which of the following is a Carnot theorem application?
All heat engines between two heat reservoirs, according to Carnot's theorem, are less effective than a Carnot heat engine working between the same reservoirs.
What is the mechanical work's magnitude?
A force acting on a body moving in the force's direction produces the work.
What is (m*g*z) capable of?
The aforementioned formula provides the fluid element's macroscopic potential energy based on its position.
A sealed rigid jar containing 2 kg of water and 1 m³ in volume has a volume of 1 m³ at 100 °C. Now that the ship has warmed up. If a safety pressure valve is installed, at what pressure should it be set to achieve a maximum temperature of 200°C?
Interpolating, the pressure for the same specific volume at 200°C is 400 + (0.53422-0.5)/(0.53422-0.42492)*(500-400) = 431.3 kPa. Initial specific volume (v1) = 1 m³/2 kg = 0.5 m³/kg.