Topics: All categories in the pool
1: Liquid level gauges must be provided with what?
- A relief valve
- A low level mark
- A red line
- Automatic shut-offs
2: What type of fuses must be used on a HVAC system?
- TR Type, Duel Element, Time Delay
- Fast blow
- 10% lower than RLA
- none of the above
3: How much clearance do you need around the perimeter of electrical panels?
- 24"
- 18"
- 12"
- 36"
4: While the system is operating, the discharge line should be
- at the same temperature as the crankcase
- room temperature
- too hot to hold by hand
- 10-15F warmer than ambient
5: A mixed occupancy occurs when two or more occupancies are located with the same building
- true
- false
6: Trichlorofluoromethane is the name of what refrigerant?
- R-12
- R-502
- R-113
- R-11
7: Control systems can be classified by
- tonnage of system
- source of power
- safety
- economy of operation
8: How can you test mechanical strength of an electrical connection?
- measure ohms with an electrical meter
- measure voltage across the connection
- attempt to pull the wire from the connector by hand
- none of the above.
9: B3 refrigerants are considered
- non-toxic but flammable
- toxic and highly flammable
- toxic but non-flammable
- non-toxic but non-flammable
10: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within
- 30 days
- 1 week
- 14 days
- 2 months
11: Evaporators within 18" of a heating coil must be equipped with a
- low limit control
- pressure relief device
- high limit control
- zone valve
12: Refrigerant is metered into the evaporator on a large centrifugal chiller thru the
- low side of the system
- high side float assembly
- cap tube
- none of the above
13: How many gallons of water do you need per pound of ammonia?
- 100
- 10
- 1
- 50
14: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
15: The two float-type metering devices are the
- liquid float and the low-side float
- vapor float and the low-side float.
- high-side float and the low-side float
- liquid float and the vapor float
16: E = I X R is
- Amps Law
- Impedance Law
- Watts Law
- Ohms Law
17: R-22 is classified as a ____ refrigerant on the safety matrix.
- A-2
- B-1
- B-2
- A-1
18: 1 HP = ____ Watts?
- 3.1416
- 3,412
- 746
- 11,239
19: There can be no airflow from an occupied space through a machine room unless what?
- System is high velocity
- System is ducted and sealed
- Duct is not located in the ceiling
- None of the above.
20: Which of the following controllers would you expect to be most sensitive to temperature changes?
- aquastat
- line voltage t-stat
- immersion controller
- low voltage t-stat
21: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- the owner shall be informed
- gas masks must be worn
- no flames shall be permitted
- explosion precautions must be taken
22: A R-410A system running with a condensing temperature of 110F and 50F evaporator temperature will read pressures of ___ on the high side and ___ on the low side
- 455 psig, 185 psig.
- 365 psig, 120 psig
- 257 psig, 77 psig
- 226 psig, 68 psig
23: Pressure is equivalent of
- Force / Area
- Area X Force
- Force X Area
- Force
24: Liquid line filter-driers on a 410A system must be rated for no less than
- 1000 psig
- 200 psig
- 600 psig
- 400 psig
25: The density of a gas refers to
- pounds per square foot
- pounds per absolute pressure
- pounds per cubic foot
- cubic feet per pound