Question 1

The humidistat is a device that can sense the amount of humidity in the air.

Accepted Answer

The humidistat is designed to measure the humidity level in the surrounding air. It can be used to control humidity, monitor it, and adjust moisture content in the environment.

Question 2

The two most common materials used to sense humidity are hair and ____.&#10;A) polyester&#10;B) nylon&#10;C) cellulose&#10;D) cotton

Accepted Answer

Nylon is commonly used alongside hair in hygrometers for sensing humidity because of its hygroscopic nature, meaning it absorbs and releases moisture from the air, which causes it to expand and contract.

Question 3

Humidity is actually a minor issue in air conditioning systems.

Accepted Answer

Humidity is actually a major issue in air conditioning systems because it affects the comfort level of the occupants and can contribute to the growth of mold and mildew in the system. Air conditioning systems have features such as dehumidifiers to address this issue.

Question 4

Humidity sensing materials change color with a change in the amount of humidity in the air.

Accepted Answer

The answer of Humidity sensing materials change color with a...

Question 5

If a humidifier is used in a central-heating or air conditioning system, it is generally operated only when the ____.&#10;A) heat exchanger is in operation&#10;B) gas shutoff valve is open&#10;C) blower is in operation&#10;D) filter is clean

Accepted Answer

If a humidifier is installed in a central heating or air conditioning system, it is generally operated only when the blower is in operation. This is because the blower is responsible for circulating air through the system and into the living space, which is necessary for the humidifier to effectively moisturize the air. Therefore, the correct choice is C, blower is in operation.

Question 6

The control of humidity is important in heating systems.

Accepted Answer

The control of humidity is important in heating systems because high humidity can create a stuffy and uncomfortable environment, while low humidity can dry out the air and cause health issues. Maintaining appropriate levels of humidity in a heated space can improve comfort and prevent damage to materials and equipment.

Question 7

The humidistat ____ if the humidity should become too high or too low.&#10;A) activates a sound alarm&#10;B) produces a change in color&#10;C) sets the system off&#10;D) activates a set of contacts

Accepted Answer

The humidistat typically has a set of contacts that will activate if the humidity reaches a level that is too high or too low. This can then trigger the HVAC system to adjust the humidity levels as needed.

Question 8

A circuit may use a(n) ____ to control the operation of a solenoid coil.&#10;A) humidistat&#10;B) ionizer&#10;C) hygrometer&#10;D) dehumidifier

Accepted Answer

A humidistat is a device that measures humidity levels and can activate or deactivate a circuit depending on the desired humidity threshold. It is commonly used in HVAC systems to control the operation of solenoid valves for humidification or dehumidification. An ionizer is a device that removes ions from the air, a hygrometer is a device that measures humidity, and a dehumidifier is a device that removes excess moisture from the air, but none of these are directly used to control solenoid coils.

Question 9

Some circuit controls use a combination of a humidistat and a(n) ____.&#10;A) sail switch&#10;B) ionizer&#10;C) hygrometer&#10;D) dehumidifier

Accepted Answer

A humidistat alone is used to control humidity levels, but when used in conjunction with a sail switch (which detects air movement), it can activate a ventilation system to help regulate humidity more effectively. An ionizer or hygrometer may also be used in conjunction with a humidistat, but neither one is necessary for controlling humidity levels in this way. A dehumidifier would work against the humidistat by lowering humidity levels, which is not what is being asked for in this question.

Question 10

To ensure that a humidifier is operated only when the blower is in operation, some means is used to interlock the humidifier with the blower.

Accepted Answer

This is true. Interlocking the humidifier with the blower ensures that the humidifier only operates when the blower is running, which helps to distribute moisture throughout the space more efficiently.

Deck 32: The Humidistat