# Temperature Measurement Quiz

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Questions on the basic operation of fluid thermometers, bimetallic thermometers, thermocouples, and resistance temperature detectors (RTD's).

• 1.

### "Which of these forms of energy is the same as heat?"

• A.

A. Thermal energy

• B.

B. Reactive energy

• C.

C. Terminal energy

• D.

D. Resistive energy

A. A. Thermal energy
Explanation
Thermal energy is the form of energy that is equivalent to heat. It refers to the internal energy of an object or a system due to the motion and vibration of its particles. When an object or a substance absorbs heat, its thermal energy increases. Therefore, thermal energy is the correct answer as it is the form of energy that represents heat.

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• 2.

### "Which of these choices best describes what temperature is?"

• A.

A. The number of fast-moving molecules in a substance

• B.

B. The degree, or intensity, of heat in a substance

• C.

C. The ratio of Celsius energy to Fahrenheit energy

• D.

D. The amount of Celsius energy

B. B. The degree, or intensity, of heat in a substance
Explanation
Temperature is a measure of the degree or intensity of heat in a substance. It represents the level of thermal energy present in a substance, indicating how hot or cold it is. Temperature is not directly related to the number of fast-moving molecules in a substance (choice A), the ratio of Celsius energy to Fahrenheit energy (choice C), or the amount of Celsius energy (choice D). Therefore, the best description of temperature is the degree or intensity of heat in a substance (choice B).

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• 3.

### "Which statement best describes the basic operating principle of a fluid thermometer?"

• A.

A. Most fluids contract when they're heated and expand when they're cooled.

• B.

B. Any fluid that's sealed in glass will give off heat.

• C.

C. Most fluids expand when they're heated, and contract when they're cooled.

• D.

D. Most fluids change color when they're heated.

C. C. Most fluids expand when they're heated, and contract when they're cooled.
Explanation
A fluid thermometer operates on the principle that most fluids expand when they are heated and contract when they are cooled. This expansion and contraction of the fluid can be measured and used to determine the temperature. Option C accurately describes this operating principle.

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• 4.

### "Select all of the actions that will occur when heat is applied to this thermometer.

• A.

A. The bimetallic element expands and rotates.

• B.

B. The rod produces a small voltage.

• C.

C. The rod turns and moves a pointer.

• D.

D. The scale moves.

A. A. The bimetallic element expands and rotates.
C. C. The rod turns and moves a pointer.
Explanation
When heat is applied to this thermometer, the bimetallic element will expand and rotate. This is because the bimetallic element consists of two different metals with different coefficients of thermal expansion, causing it to bend or rotate when heated. Additionally, the rod will turn and move a pointer. This is because the expansion of the bimetallic element will be transmitted to the rod, causing it to move and rotate the pointer on the scale, indicating the temperature change.

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• 5.

### "What happens when heat is applied to the joined ends of the wires of a thermocouple?"

• A.

A. The wires contract.

• B.

B. The wires start to rotate.

• C.

C. The wires generate a small voltage.

• D.

D. The wires separate.

C. C. The wires generate a small voltage.
Explanation
When heat is applied to the joined ends of the wires of a thermocouple, the wires generate a small voltage. This is because a thermocouple consists of two different metals that are joined together at the ends. When the temperature at the junction of the two metals changes, it creates a temperature gradient which leads to the generation of a voltage. This phenomenon, known as the Seebeck effect, is the basis of how thermocouples work to measure temperature.

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• 6.

### "The degree, or intensity, of heat in a substance is known as what?"

• A.

A. Resistance

• B.

B. Temperature

• C.

C. Capacitance

• D.

D. Turbidity

B. B. Temperature
Explanation
The degree or intensity of heat in a substance is known as temperature. Temperature measures the average kinetic energy of the particles in a substance, indicating how hot or cold it is. Resistance refers to the opposition to the flow of electric current, capacitance is the ability of a system to store an electric charge, and turbidity refers to the cloudiness or haziness of a liquid.

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• 7.

### "Which  scales are commonly  used  on temperature measuring devices?"

• A.

A. Fahrenheit and Celsius

• B.

B. Fahrenheit and inches of mercury

• C.

C. Celsius and millimeters of mercury

• D.

D. Celsius and PSIA

A. A. Fahrenheit and Celsius
Explanation
Fahrenheit and Celsius are commonly used scales on temperature measuring devices. Fahrenheit is commonly used in the United States, while Celsius is used in most other countries. These scales are used to measure temperature and provide a reference point for determining hotness or coldness.

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• 8.

### "Select the statement that best describes the principle on which a fluid thermometer operates."

• A.

A. Most fluids contract when they're heated and expand when they're cooled.

• B.

B. Fluids change resistance when temperature changes.

• C.

C. Most fluids expand when they're heated and contract when they're cooled.

• D.

D. Fluids are not affected by changes in temperature.

C. C. Most fluids expand when they're heated and contract when they're cooled.
Explanation
The correct answer is C. Most fluids expand when they're heated and contract when they're cooled. This principle is based on the fact that most substances, including fluids, tend to expand when heated because the increase in temperature causes the molecules to move faster and spread apart. Conversely, when the fluid is cooled, the decrease in temperature causes the molecules to slow down and come closer together, resulting in contraction. This expansion and contraction of the fluid can be used to measure temperature changes in a fluid thermometer.

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• 9.

### "What is another name that can be used to describe this thermocouple?"

• A.

A. Thermoelectric device

• B.

B. Pressure transmitting device

• C.

C. Metallic diaphragm device

• D.

D. Resistance pressure device

A. A. Thermoelectric device
Explanation
The correct answer is A. Thermoelectric device. A thermocouple is a device that converts thermal energy into electrical energy. It consists of two different metal wires joined together at one end, which creates a temperature difference between the two ends. This temperature difference generates a voltage, known as the thermoelectric voltage. Therefore, "thermoelectric device" is an appropriate name to describe a thermocouple. The other options, such as pressure transmitting device, metallic diaphragm device, and resistance pressure device, do not accurately describe a thermocouple.

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• 10.

### "Select all of the actions that occur when the temperature surrounding an RTD increases.

• A.

A. The resistance of the RTD changes.

• B.

B. The circuit detects a change in the current flow.

• C.

C. The wire in the RTD contracts.

• D.

D. The circuit increases voltage to the RTD.

A. A. The resistance of the RTD changes.
B. B. The circuit detects a change in the current flow.
Explanation
When the temperature surrounding an RTD (Resistance Temperature Detector) increases, the resistance of the RTD changes. This is because the resistance of metals generally increases with temperature. Additionally, the circuit detects a change in the current flow because the change in resistance affects the flow of current through the RTD. The other options, the wire in the RTD contracting and the circuit increasing voltage to the RTD, are not actions that occur when the temperature surrounding an RTD increases.

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• Current Version
• Mar 22, 2023
Quiz Edited by
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• Dec 05, 2011
Quiz Created by
Gshalansky

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