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38 True/False questions

  1. 19. What must be used with a thermistor to control a mechanical device or machine?A Thermostat.

          

  2. T10. The thermistor is an electronic solid-state semiconductor thatMeasure temperature.

          

  3. T7. The thermocoupleis constructed of two different metals.

          

  4. 18. Define a thermistor.Is constructed with several thermocouples wired in series with each other.

          

  5. 21. What do the terms PTC and NTC mean with regard to thermistors?Positive Temperature Coefficient, and Negative Temperature Coefficient.

          

  6. 5. What two metals can be used in the bimetal device or rod and tube?Snap disc.

          

  7. 3. How can the bimetal strip be extended to have more travel per degree of temperature change?Two unlike metals, commonly brass and steel.

          

  8. T13. The liquid-filled mercury tube is used forMeasure temperature.

          

  9. 1. What is the device that consists of two unlike metal strips that are attached and have a different rate of expansion and contraction?Bimetal.

          

  10. 2. What are some applications of the bimetal strip?Ensuring a pilot light is lit.

          

  11. 22. Draw and explain how a PTC thermistor assistswith increasing the starting torque of a motor.At the moment of start, the thermistor has a low resistance, and allows a large inrush of current to help the starting torque of a motor. As it heats, resistance is increased, and it stops current through the PTC.
    (See Figure 13.28 on page 319)

          

  12. 7. Name two characteristics of a diaphragm.A thermistor is a solid-state device known as a semiconductor; it requires an electronic circuit to function.

          

  13. T15. What is an application for a positive temperature coefficient (PTC) thermistor device?A PTC thermistor can be used to help start a motor.

          

  14. 15. How can a thermocouple be used to verify that a gas flame is present?iron and constanton metals.

          

  15. T12. The thermistor may be used toTo control space temperature, to control product temperature, and as a safety device.

          

  16. 14. What is a device consisting of two unlike metals fastened at one end that, when heated on the fastened end, produces a DC current?A thermocouple.

          

  17. 10. An accordion-type device with a large internal volume that has a lot of travel is referred to as aSnap disc.

          

  18. 13. How does the temperature/pressure relationship explain the partially filled remote-bulb control?A longer strip will have more travel per degree.

          

  19. T9. The thermopileis constructed of two different metals.

          

  20. T14. Why is it important to prove that the pilot flame is lit on a gas furnace before turning on the main gas burner?Two unlike metals, commonly brass and steel.

          

  21. 12. Which type of fluid is normally found in a bellows?iron and constanton metals.

          

  22. T1. Modulating controls, in general, are used toMeasure temperature.

          

  23. T6. The bourdon tubeTends to straighten out with an increase in pressure.

          

  24. 23. Two PTC thermistors can be used in an electronic circuit to measure ______ when pulling a vacuum.Microns.

          

  25. T5. An example of a bimetal device is aConstructed of two unlike metals attached back-to-back.

          

  26. 9. What is one application for the totally liquid-filled control?Mercury.

          

  27. T3. A bimetal device isConstructed of two unlike metals attached back-to-back.

          

  28. T2. The thermostat is usedIs constructed with several thermocouples wired in series with each other.

          

  29. T8. The thermocoupleis constructed of two different metals.

          

  30. T11. A common use for a thermocouple isTo detect a pilot light flame.

          

  31. 17. Thermocouples are normally made ofMeasure temperature.

          

  32. 16. What is used with a thermocouple to control a mechanical device or machine?A Thermostat.

          

  33. 11. What is the difference between a bellows and a diaphragm?A diaphragm is used to stop, start, or modulate controls, while a bellows is used where more movement per degree is required/desired.

          

  34. 6. A thin, flexible metal disc with a large surface area is aConstructed of two unlike metals attached back-to-back.

          

  35. 20. What does a thermistor do that makes it different from a thermocouple?Positive Temperature Coefficient, and Negative Temperature Coefficient.

          

  36. 4. What is a bimetallic type of control used for many years in residential gas water heaters?A thermocouple.

          

  37. T4. The movement or travel of a bimetal device can be lengthened bySnap disc.

          

  38. 8. What fluid can be used in a totally liquid-filled bulb control?Mercury.