# How well do you know Heat Engines?

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Have you studied heat engines in thermodynamics? Do you remember it? Let's see how well you know heat engines with this knowledge quiz. Heat engines are an important part when it comes to thermodynamics. So, it is time to test and enhance your knowledge. It is possible with this quiz. You must give this quiz a try. All the best for a 100% score on this quiz. Do share the quiz results with others to challenge them on scores.

• 1.

### The law of conservation of energy  _____.

• A.

States that energy transfers from an object of higher temperature to an object of lower temperature

• B.

States that energy can be is not lost when it is transformed to a usable form in a heating system

• C.

Is also called the law of thermodynamics

• D.

None of the above

C. Is also called the law of thermodynamics
Explanation
The law of conservation of energy is also called the law of thermodynamics.

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• 2.

### Convection is a method of energy transfer that uses _____ to transfer energy.

• A.

Machines

• B.

Solids

• C.

Matter

• D.

Fluids

D. Fluids
Explanation
Convection is a method of energy transfer that uses fluids to transfer energy. In convection, heat is transferred through the movement of fluids, such as air or water, which carry the thermal energy from one place to another. This process occurs through the movement of hot fluids rising and cold fluids sinking, creating a continuous circulation that transfers heat. Therefore, fluids play a crucial role in convection as they facilitate the transfer of energy.

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• 3.

### What is the transfer of energy from one object to another because of a difference in temperature called?

• A.

Combustion

• B.

Heat

• C.

Kinetic Energy

• D.

Specific Heat

B. Heat
Explanation
Heat is the transfer of energy from one object to another due to a difference in temperature. When two objects of different temperatures come into contact, heat flows from the object with higher temperature to the object with lower temperature until both objects reach thermal equilibrium. Heat can be transferred through conduction, convection, or radiation. It is an important concept in thermodynamics and plays a crucial role in various natural processes and human activities.

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• 4.

### Which of the following is known to be a good conductor?

• A.

Iron

• B.

Air

• C.

Oil

• D.

Wood

A. Iron
Explanation
Iron is known to be a good conductor because it has a high electrical conductivity. This means that it allows electric current to flow easily through it. Iron is widely used in electrical wiring and circuits because of its ability to conduct electricity efficiently. Additionally, iron is also a good conductor of heat, making it suitable for applications such as cooking utensils and heating elements.

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• 5.

### What is the fluid that vaporizes in a heat pump called?

• A.

Refrigerant

• B.

Oil

• C.

Water

• D.

Air

A. Refrigerant
Explanation
Refrigerant is the fluid that vaporizes in a heat pump. It is responsible for absorbing heat from the surroundings and then releasing it at a higher temperature. Refrigerants have low boiling points, allowing them to easily change from a liquid to a gas and back again. This phase change is what allows the heat pump to transfer heat efficiently.

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• 6.

### Which of the following states the second law of thermodynamics?

• A.

The heat naturally flows from a colder object to a hotter object.

• B.

The energy cannot be created nor destroyed.

• C.

The temperature naturally moves from high energy to low.

• D.

The heat naturally flows from a hotter object to a colder object.

D. The heat naturally flows from a hotter object to a colder object.
Explanation
The second law of thermodynamics states that heat naturally flows from a hotter object to a colder object. This is because heat is a form of energy, and energy tends to disperse or spread out over time. Therefore, when two objects are in contact, the object with higher temperature (more heat energy) will transfer heat to the object with lower temperature (less heat energy) until they reach thermal equilibrium. This process is irreversible and leads to an increase in the overall entropy or disorder of the system.

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• 7.

### Which method or methods of energy transfer needs matter to transfer energy?

• A.

Convection

• B.

Conduction and convection

• C.

Conduction

• D.

B. Conduction and convection
Explanation
Conduction and convection are methods of energy transfer that require matter to transfer energy. In conduction, energy is transferred through direct contact between particles or objects. This occurs when particles with higher energy collide with particles with lower energy, transferring energy to them. In convection, energy is transferred through the movement of fluid or gas. This occurs when heated particles rise and cooler particles sink, creating a circular motion that transfers energy. Both of these methods rely on the presence of matter to transfer energy.

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• 8.

### What is the correct order of the four strokes of an internal combustion engine?

• A.

Intake, compression, power, exhaust

• B.

Compression, exhaust, intake, power

• C.

Power, intake, exhaust, compression

• D.

Intake, power, compression, exhaust

A. Intake, compression, power, exhaust
Explanation
The correct order of the four strokes of an internal combustion engine is intake, compression, power, and exhaust. During the intake stroke, the fuel-air mixture is drawn into the cylinder. In the compression stroke, the mixture is compressed to increase its pressure and temperature. The power stroke is where the spark plug ignites the compressed mixture, causing an explosion that generates power. Finally, in the exhaust stroke, the burned gases are expelled from the cylinder.

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• 9.

### During which stroke in a four-stroke engine is the temperature the highest?

• A.

Intake

• B.

Compression

• C.

Power

• D.

Exhaust

C. Power
Explanation
During the power stroke in a four-stroke engine, the temperature is the highest. This is because during this stroke, the compressed air-fuel mixture is ignited by the spark plug, resulting in a rapid and controlled combustion process. The burning of the fuel generates a significant amount of heat, causing the temperature to rise to its highest point during this stroke.

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• 10.

### An internal combustion engine is  ______.

• A.

Is mainly used as a heating system

• B.

A four-cylinder engine

• C.

An external combustion engine

• D.

A four-stroke engine

D. A four-stroke engine
Explanation
An internal combustion engine is a four-stroke engine. This type of engine operates through the four-stroke cycle, which includes intake, compression, combustion, and exhaust. It is commonly used in automobiles and other machinery to convert the energy from burning fuel into mechanical work. The four-stroke engine is characterized by its efficiency, reliability, and widespread use in various industries.

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• Current Version
• Nov 16, 2023
Quiz Edited by
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• Nov 21, 2022
Quiz Created by
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