CACC Chapter 5 Test questions with
complete solutions rated A+
A compressor in a refrigerator converts a freon gas into a liquid - correct answer ✔✔True
An increased thermocouple output voltage can be obtained by wiring two or more thermocouples in
parallel - correct answer ✔✔False
Thermodynamics refers to energy movement from ____. - correct answer ✔✔A. hot to cold
Molecular movement stops when ____ is reached. - correct answer ✔✔c. absolute 0
The process by which thermal energy is transferred by a solid is called ____ - correct answer ✔✔b.
conductance
The process by which thermal energy is transferred by a gas is called ____. - correct answer ✔✔a.
convection
Condensation ____. - correct answer ✔✔b. gains heat energy
A calorie is work performed based on the ____ temperature scale. - correct answer ✔✔b. Celsius
A(n) ____ has a positive temperature coefficient - correct answer ✔✔b. RTD
If the temperature to which the circuits in Figure 5-1 are exposed increases, the voltage measured by the
meter will ____. - correct answer ✔✔a. increase
A thermocouple produces a voltage that is proportional to the ____. - correct answer ✔✔a. difference in
temperature between the hot and cold junction
, In thermocouple circuits, cold junction compensation is used to eliminate error due to the effects of
____ - correct answer ✔✔c. ambient temperature
The basic laws of physics state that every object with a temperature above absolute zero radiates energy
in the form of ____ - correct answer ✔✔d. electromagnetic waves
As the temperature of an object increases, the frequency of the electromagnetic waves that it emits
____. - correct answer ✔✔a. increases
Because all target objects are not perfect black bodies, most pyrometers include some way to adjust for
target ____. - correct answer ✔✔b. emissivity
An arrangement of several thermocouples wired in series for the purpose of increasing sensitivity is
referred to as a(n) ____ - correct answer ✔✔b. thermopile
A pyrometer in which the operator determines temperature by adjusting the intensity of a lamp to
match the brightness of the target is called a(n) ____ pyrometer - correct answer ✔✔c. optical
A pyrometer that measures radiant energy at two different wavelengths is the ____ pyrometer. - correct
answer ✔✔c. ratio
Which type of pyrometer is the least susceptible to dust and smoke? - correct answer ✔✔c. ratio
the process by which thermal energy is transferred by a vacuum is called ____. - correct answer ✔✔c.
radiation
When a bimetallic thermometer is exposed to heat, the strip will bend in the direction of the metal with
the ____ expansion rate. - correct answer ✔✔a. lower
The thermistor ____ when the temperature to which it is exposed varies - correct answer ✔✔a.
resistance changes
complete solutions rated A+
A compressor in a refrigerator converts a freon gas into a liquid - correct answer ✔✔True
An increased thermocouple output voltage can be obtained by wiring two or more thermocouples in
parallel - correct answer ✔✔False
Thermodynamics refers to energy movement from ____. - correct answer ✔✔A. hot to cold
Molecular movement stops when ____ is reached. - correct answer ✔✔c. absolute 0
The process by which thermal energy is transferred by a solid is called ____ - correct answer ✔✔b.
conductance
The process by which thermal energy is transferred by a gas is called ____. - correct answer ✔✔a.
convection
Condensation ____. - correct answer ✔✔b. gains heat energy
A calorie is work performed based on the ____ temperature scale. - correct answer ✔✔b. Celsius
A(n) ____ has a positive temperature coefficient - correct answer ✔✔b. RTD
If the temperature to which the circuits in Figure 5-1 are exposed increases, the voltage measured by the
meter will ____. - correct answer ✔✔a. increase
A thermocouple produces a voltage that is proportional to the ____. - correct answer ✔✔a. difference in
temperature between the hot and cold junction
, In thermocouple circuits, cold junction compensation is used to eliminate error due to the effects of
____ - correct answer ✔✔c. ambient temperature
The basic laws of physics state that every object with a temperature above absolute zero radiates energy
in the form of ____ - correct answer ✔✔d. electromagnetic waves
As the temperature of an object increases, the frequency of the electromagnetic waves that it emits
____. - correct answer ✔✔a. increases
Because all target objects are not perfect black bodies, most pyrometers include some way to adjust for
target ____. - correct answer ✔✔b. emissivity
An arrangement of several thermocouples wired in series for the purpose of increasing sensitivity is
referred to as a(n) ____ - correct answer ✔✔b. thermopile
A pyrometer in which the operator determines temperature by adjusting the intensity of a lamp to
match the brightness of the target is called a(n) ____ pyrometer - correct answer ✔✔c. optical
A pyrometer that measures radiant energy at two different wavelengths is the ____ pyrometer. - correct
answer ✔✔c. ratio
Which type of pyrometer is the least susceptible to dust and smoke? - correct answer ✔✔c. ratio
the process by which thermal energy is transferred by a vacuum is called ____. - correct answer ✔✔c.
radiation
When a bimetallic thermometer is exposed to heat, the strip will bend in the direction of the metal with
the ____ expansion rate. - correct answer ✔✔a. lower
The thermistor ____ when the temperature to which it is exposed varies - correct answer ✔✔a.
resistance changes
