Title: Unit 11 Quiz
Course: HET 191 HVACR Heat Load > Section: HET 191 HVACR Heat Load

Q: The pressure in a duct system is measured in:
- psig
- psia
- " Hg
- " WC
A: " WC

Q: If the equivalent length of a transition piece of ductwork is 10 feet and the main duct in series with it is 20 feet, what is the length used to estimate the total frictional loss?
- 10 feet
- 30 feet
- 60 feet
- 20 feet
A: 30 feet

Q: The ____ or fan provides the pressure difference to force the air into the duct system, through the heat transfer surfaces in the conditioning equipment, through the grilles and registers, and into the room.
- blower
- forcer
- compressor
- condenser
A: blower

Q: The atmosphere exerts a pressure of ____ at standard atmospheric conditions.
- 12.696 psi
- 14.696 psi
- 16.696 psi
- 18.696 psi
A: 14.696 psi

Q: Measuring velocity pressure in a duct indicates the ____.
- volume of air through a duct
- speed at which the air is moving
- pressure against the sides of the duct
- weight of the air moving through the duct
A: speed at which the air is moving

Q: An instrument used to measure the actual air velocity is the  ____.
- velometer
- manometer
- volumeter
- pitotmeter
A: velometer

Q: What is the volume of a room that measures 10 ft by 20 ft with an 8-ft ceiling?
- water velometer
- water manometer
- air manometer
- air velometer
A: water manometer

Q: Which of the following is typically measured with a water manometer?
- static pressure in a duct system
- pressure in a refrigeration system
- manifold pressure in a gas fired furnace
- nozzle pressure of an oil burner
A: static pressure in a duct system

Q: The reason for using a reducing extended plenum system is to ____.
- save metal by using a smaller duct
- reduce the operating cost of the system
- provide easier means of fastening the take off fittings
- maintain a more even pressure throughout the entire length of the trunk duct
A: maintain a more even pressure throughout the entire length of the trunk duct

Q: One reason for using a reducing plenum system is to ____.
- save materials
- keep the noise level low
- keep the duct pressures constant
- both a and c
A: both a and c

Q: A(n) ____ degree F temperature difference from inside the duct to outside the duct is considered the maximum difference allowed before insulation is necessary.
- 15
- 18
- 20
- 22
A: 15