Deck 9: Temperature Control

Question 1

With reference to temperature controllers, ____ refers to the operational functions that a controller has.

A) proportioning band
B) rate
C) the control point
D) mode

Answer 1

D

Question 2

Compared to thermocouples, RTDs are less repeatable and less stable.

Answer 2

False

Question 3

____ is the difference in temperature at the sensing element between make and break of the controller's contacts when the controller is cycled.

A) Resolution sensitivity
B) Operating differential
C) Sensitivity
D) Response time

Answer 3

B

Question 4

The actual temperature in an on/off system will always fluctuate about some value.

Question 5

The temperature switch (thermostat) is generally used at ____________________ temperatures than the pyrometer.

Question 6

The ____ is a semiconductor whose resistance decreases with increasing temperature.

A) thermocouple
B) thermistor
C) resistance temperature detector (RTD)
D) contactor

Question 7

The main difference among temperature switches is the means by which the temperature information is transferred from the sensing element to the switching element.

Question 8

_____________________ control turns the heating elements on or off based on the difference between the actual temperature and the set-point.

Question 9

Temperature switches using differential expansion of metals may be of two different
types. One uses a mechanical link; the other uses a ____________________.

Question 10

There are three basic types of sensing element: (1) ____________________, (2) differential expansion of metal, and (3) expansion of fluid, gas, or vapor.