Thermodynamic Systems: Interactive Learning Quizzes for Mechanical Principles

Question 1

Which characteristic describes an open thermodynamic system?

Accepted Answer

Both energy and mass transfer across the system boundary

Answer

No mass transfer across the system boundary

Answer

Energy transfer but no mass transfer across the system boundary

Answer

No energy transfer across the system boundary

Question 2

Which statement best encapsulates an isolated thermodynamic system?

Accepted Answer

No exchange of mass or energy with the external environment is permitted.

Answer

Only energy exchange is allowed, while mass transfer is not.

Answer

Only mass transfer is allowed, while energy exchange is not.

Answer

Both mass and energy transfer are permitted.

Question 3

In a closed system undergoing a cyclic process, what is the net change in internal energy?

Accepted Answer

Zero

Answer

Positive

Answer

Negative

Answer

Cannot be determined

Question 4

Consider a piston-cylinder system containing an ideal gas. If the gas undergoes a process where its volume decreases while its temperature remains constant, what type of process is this?

Accepted Answer

Isothermal

Answer

Adiabatic

Answer

Isobaric

Answer

Isochoric

Question 5

Which cycle boasts the highest efficiency for heat transfer between two reservoirs?

Accepted Answer

Carnot cycle

Answer

Otto cycle

Answer

Diesel cycle

Answer

Brayton cycle

Question 6

In a refrigeration system, what is the primary function of the condenser?

Accepted Answer

To release heat to the environment

Answer

To absorb heat from the refrigerant

Answer

To compress the refrigerant

Answer

To expand the refrigerant

Question 7

Which type of thermodynamic system neither exchanges mass nor energy with its surroundings?

Accepted Answer

Isolated system

Answer

Open system

Answer

Closed system

Answer

Adiabatic system

Question 8

Which of the following processes is considered isentropic?

Accepted Answer

Reversible heat transfer

Answer

Irreversible heat transfer

Answer

Adiabatic compression

Answer

Isobaric expansion

Question 9

What is the fundamental principle described by the first law of thermodynamics?

Accepted Answer

Energy cannot be created or destroyed, only transferred or transformed.

Answer

Entropy always increases in a closed system.

Answer

Heat flows from a hotter to a colder body.

Answer

The total energy of an isolated system remains constant.

Question 10

Explain the difference between heat and temperature.

Accepted Answer

Heat is a form of energy, while temperature is a measure of the average kinetic energy of particles.

Answer

Temperature is a form of energy, while heat is a measure of the average kinetic energy of particles.

Answer

Heat and temperature are the same thing.

Answer

Heat is a form of matter, while temperature is a measure of the energy of particles.

Question 11

Which of the following units is used to measure heat?

Accepted Answer

Joule

Answer

Kelvin

Answer

Watt

Answer

Celsius

Question 12

What is the mathematical relationship between pressure, volume, and temperature in an ideal gas?

Accepted Answer

PV = nRT

Answer

PV = kT

Answer

V = kP

Answer

T = kP

Question 13

According to the second law of thermodynamics, what is its main implication for the efficiency of energy conversion systems?

Accepted Answer

It establishes a theoretical limit on the maximum efficiency that can be achieved in energy conversion processes.

Answer

It determines the direction of heat flow between different parts of a thermodynamic system.

Answer

It predicts the equilibrium state of a closed thermodynamic system.

Answer

It allows us to calculate the rate of change in entropy within a system.

Question 14

How does mass transfer impact the analysis of open thermodynamic systems?

Accepted Answer

It affects both energy and entropy balances.

Answer

It can be ignored if the mass flow rate is high.

Answer

It has no effect on open system behavior.

Question 15

Which mechanism allows energy to move across the boundary of a thermodynamic system due to differences in temperature?

Accepted Answer

Heat

Answer

Work

Answer

Mass

Answer

Entropy

Question 16

Which of the following is NOT a characteristic of an open system?

Accepted Answer

No mass can leave the system.

Answer

Energy can enter or leave the system.

Answer

The system can exchange heat with the surroundings.

Answer

Mass, energy, and work can enter or leave the system.

Question 17

A closed system is one in which:

Accepted Answer

No mass can enter or leave the system, but energy can.

Answer

No mass or energy can enter or leave the system.

Answer

Both mass and energy can freely enter or leave the system.

Answer

Mass can enter or leave the system, but energy cannot.

Question 18

Which of the following is an example of an isolated system?

Accepted Answer

A thermos flask containing hot coffee.

Answer

A person exercising on a treadmill.

Answer

A car engine running at a constant speed.

Answer

A bicycle pump compressing air.

Question 19

Which of the following is a thermodynamic property?

Accepted Answer

Temperature

Answer

Force

Answer

Displacement

Answer

Velocity

Question 20

Which of the following is a heat engine?

Accepted Answer

A car engine

Answer

A refrigerator

Answer

A battery

Answer

A solar panel

Question 21

Which of the following is a reversible process?

Accepted Answer

A gas expands isothermally.

Answer

A gas is compressed adiabatically.

Answer

A gas is heated isochorically.

Answer

A gas is cooled isobarically.

Question 22

Which of the following is a characteristic of an open system?

Accepted Answer

Mass and energy can enter and leave the system.

Answer

The system is isolated from its surroundings.

Answer

There is no exchange of energy with the surroundings.

Answer

The system is at a constant temperature.

Question 23

A closed system is one in which:

Accepted Answer

Mass cannot enter or leave the system, but energy can.

Answer

Mass can enter and leave the system, but energy cannot.

Answer

Both mass and energy can freely enter and leave the system.

Question 24

Which of the following is an example of a closed system in an engineering context?

Accepted Answer

A pressure vessel

Answer

A refrigerator

Answer

An air compressor

Answer

A heat exchanger

Question 25

What is the main difference between an open and a closed system?

Accepted Answer

Open systems can exchange both mass and energy, while closed systems can only exchange energy.

Answer

Open systems are typically larger in size than closed systems.

Answer

Closed systems are always at a higher temperature than open systems.

Question 26

What is the first law of thermodynamics?

Accepted Answer

Energy cannot be created or destroyed, only transferred or transformed.

Answer

Heat flows from hot to cold.

Answer

Entropy always increases in an isolated system.

Question 27

Which of the following is a thermodynamic state variable?

Accepted Answer

Temperature

Answer

Force

Answer

Power

Answer

Velocity

Question 28

What is the difference between a thermodynamic process and a thermodynamic cycle?

Accepted Answer

A process is a change in the state of a system, while a cycle is a series of processes that returns the system to its initial state.

Answer

Processes are typically irreversible, while cycles are always reversible.