---

Question 1:

What is a thermocouple?

A) A device that measures temperature using a liquid-filled bulb
B) A type of thermometer with a bimetallic strip
C) A temperature sensor that uses the Seebeck effect
D) A digital temperature measuring device

Show Answer

Explanation: The correct answer is C) A temperature sensor that uses the Seebeck effect. A thermocouple is a temperature sensor that operates based on the Seebeck effect. It consists of two different metal wires joined together at one end, and when there is a temperature difference between the junction and the other end, it generates a voltage that is proportional to the temperature difference.

---

Question 2:

What is the principle behind the operation of a thermocouple?

A) Expansion and contraction of different metals
B) Change in electrical resistance with temperature
C) Generation of an electric voltage with temperature difference
D) Absorption or emission of light at specific wavelengths

Show Answer

Explanation: The correct answer is C) Generation of an electric voltage with temperature difference. The principle behind the operation of a thermocouple is the generation of an electric voltage when there is a temperature difference between the junction and the other end of the thermocouple. This voltage is proportional to the temperature difference and can be measured to determine the temperature.

---

Question 3:

Which of the following is a common type of thermocouple?

A) Platinum resistance thermometer
B) Mercury-in-glass thermometer
C) Gas-filled thermometer
D) Type K thermocouple

Show Answer

Explanation: The correct answer is D) Type K thermocouple. Type K thermocouples are one of the most common types of thermocouples used for temperature measurement. They consist of a chromel (Nickel-Chromium) wire and an alumel (Nickel-Aluminum) wire. Type K thermocouples have a wide temperature range and are suitable for various applications.

---

Question 4:

What is the temperature range of a Type K thermocouple?

A) -200°C to 500°C
B) -50°C to 150°C
C) 0°C to 100°C
D) -1000°C to 1000°C

Show Answer

Explanation: The correct answer is A) -200°C to 500°C. Type K thermocouples have a temperature range of approximately -200°C to 500°C (-328°F to 932°F). This wide range makes them suitable for a variety of applications, including industrial processes, HVAC systems, and laboratory experiments.

---

Question 5:

What is an advantage of using thermocouples for temperature measurement?

A) High measurement accuracy
B) Resistance to electromagnetic interference
C) Low cost
D) Fast response time

Show Answer

Explanation: The correct answer is B) Resistance to electromagnetic interference. One of the advantages of thermocouples is their resistance to electromagnetic interference (EMI). They are less susceptible to EMI compared to other temperature measurement devices, making them suitable for use in environments with electrical noise or electromagnetic fields.