Free Bachelor of Mechanical Engineering Thermodynamics Questions and Answers

Question 1

What exactly is thermodynamics?

Accepted Answer

study of the relationship between heat and other forms of energy

Answer

This area of physical science is focused on how heat interacts with many types of energy, including mechanical, electrical, chemical, and others.

Question 2

Which of the following statements best describes a thermodynamics law?

Accepted Answer

Ideal Gas Law of thermodynamics

Answer

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.

Question 3

A cooler body cannot voluntarily give off heat to a hotter one. Which of the following statements about thermodynamics is true?

Accepted Answer

Second law of thermodynamics

Answer

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.

Question 4

Which of the following is a thermodynamics application?

Accepted Answer

Power plants

Answer

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.

Question 5

Which of the following laws of thermodynamics defines enthalpy?

Accepted Answer

Third law of thermodynamics

Answer

While enthalpy (H = U + PV) is fundamentally defined and derived from the First Law of Thermodynamics, which relates heat, work, and internal energy, the Third Law of Thermodynamics establishes a reference point for entropy at absolute zero. This absolute entropy is crucial for determining absolute values of thermodynamic potentials (like Gibbs free energy, G = H - TS), which incorporate enthalpy, especially in low-temperature contexts. Thus, the Third Law contributes to the complete thermodynamic characterization that includes enthalpy.

BME - Bachelor of Mechanical Engineering Practice Test

BME - Bachelor of Mechanical Engineering Practice Test

Free Bachelor of Mechanical Engineering Thermodynamics Questions and Answers