Hydronic heating Exam 1 Questions with
Correct Answers
What is the primary purpose of a heating system?
To provide comfort to the individual in the space.
Heat always travels in which direction?
From warm object to cooler objects.
What is not considered when calculating heat loss?
Interior walls of the building.
ODT is an acronym for what?
Outdoor Design Temperature.
To what does designed temperature difference (DTD) refer?
The indoor temperature minus the outdoor temperature.
What is the recommended practice for determining room dimensions?
Measurements should be rounded up or down to the nearest 0.025 of a foot.
What type of heat loss results in cool air from the outside being drawn into the building
through cracks around windows, doors, and loose construction?
Infiltration losses
Which of the following heat loss type transfers heat through a ceiling?
Transmission losses
What must be known in order to properly size a boiler?
, Total net heat loss of the space being heated.
What cause frequent cycling of a boiler?
A boiler with an output that is too high for the application.
Whose procedure should be followed for proper boiler startup?
The boiler manufacturer.
What is the safest way to check for gas leaks prior to firing the boiler?
Soapy water solution
Flow rate, temperature drop, and pressure drop are used to size____?
Size of piping
Which gallon flow rate will deliver 35065 btu/hr at 20 degrees Fahrenheit?
3.5 gpm 350065btu
500ibs/GPM x Change in temperature)
What must be known in order to properly size the output of a pump for a hydronic
heating system?
Feet of head and GPM
What is the main function of an expansion handling device?
To allow the water in the system to expand and contract as the system water heats and cools.
How do diaphragm tanks differ from standard closed expansion tanks?
Diaphragm tanks have a bladder that separates the water and air.
In what section of the heating code will you find definitions?
Correct Answers
What is the primary purpose of a heating system?
To provide comfort to the individual in the space.
Heat always travels in which direction?
From warm object to cooler objects.
What is not considered when calculating heat loss?
Interior walls of the building.
ODT is an acronym for what?
Outdoor Design Temperature.
To what does designed temperature difference (DTD) refer?
The indoor temperature minus the outdoor temperature.
What is the recommended practice for determining room dimensions?
Measurements should be rounded up or down to the nearest 0.025 of a foot.
What type of heat loss results in cool air from the outside being drawn into the building
through cracks around windows, doors, and loose construction?
Infiltration losses
Which of the following heat loss type transfers heat through a ceiling?
Transmission losses
What must be known in order to properly size a boiler?
, Total net heat loss of the space being heated.
What cause frequent cycling of a boiler?
A boiler with an output that is too high for the application.
Whose procedure should be followed for proper boiler startup?
The boiler manufacturer.
What is the safest way to check for gas leaks prior to firing the boiler?
Soapy water solution
Flow rate, temperature drop, and pressure drop are used to size____?
Size of piping
Which gallon flow rate will deliver 35065 btu/hr at 20 degrees Fahrenheit?
3.5 gpm 350065btu
500ibs/GPM x Change in temperature)
What must be known in order to properly size the output of a pump for a hydronic
heating system?
Feet of head and GPM
What is the main function of an expansion handling device?
To allow the water in the system to expand and contract as the system water heats and cools.
How do diaphragm tanks differ from standard closed expansion tanks?
Diaphragm tanks have a bladder that separates the water and air.
In what section of the heating code will you find definitions?
