Topics: All categories in the pool
1: Sensible heat is the heat added to a substance to
- change its state
- cause evaporation
- freeze it
- raise its temperature
2: What would be the classification for Stop & Shop grocery store?
- Industrial
- Place of assembly
- Large mercantile
- Instituional
3: What type of relief valve is used on low pressure centrifugal compressor systems?
- Spring-loaded relief valve
- Rupture disc
- Purge relief
- None of the above
4: A mercury bulb controller is not recommended for
- use where vibration is severe
- low voltage use
- line or low voltage use
- line voltage use
5: In an A/C unit, dirty filters will cause
- low oil pressure
- high suction pressur
- high discharge pressure
- low suction pressure
6: How many different groups of refrigerants are there?
- 11
- 7
- 15
- 3
7: What is Trichlorotrifluoromethane?
- R-11
- R-13
- R-113
- R-12
8: Pressure vessels having an inside diameter of 6” or less shall be protected by
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
- a pressure relief device
- either a fusible plug or a pressure relief device
- a fusible plug
9: The proper location for an oil separator is between the
- evaporator and compressor
- receiver and metering device
- condenser and receiver
- compressor and condenser
10: How many refrigerant classifications are there for flammability?
- 2
- 3
- 1
- 7
11: When energized, a normally open relay will be
- depends on the type and class of the relay
- open
- closed
- noisy
12: NH3 is
- lithium bromide
- R-718
- R-508A
- ammonia
13: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of
- low head pressure
- not enough oil in the system
- moisture in the system
- oil in evaporator
14: Pressure is equivalent of
- Force
- Force X Area
- Area X Force
- Force / Area
15: What kind of material can't be used on the outlet of a relief valve?
- Stainless Steel
- Aluminum
- PVC
- Copper
16: Before replacing a seized compressor, the _______ should be determinded.
- current draw
- type of refrigerant
- designed head pressure
- cause of seizure
17: The freezing point of water at sea level is?
- 0F
- -10C
- 32C
- 32F
18: Refrigerant restricted in 2004 but used for transition for decades:
- R-123
- R-22
- R-11
- R-134A
19: A class B1 refrigerant is considered
- non-toxic but highly flammable
- toxic but non-flammable
- toxic and somewhat flammable
- non-toxic and non-flammable
20: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.
- 15
- 75
- 50
- 55
21: What must be done to all doors and access points in duct work going through a mechanical room?
- Must be hindged
- Must be screwed shut
- Must be sealed and gasketed
- All of the above
22: Where must a refrigeration contractor's license number be displayed?
- Uniforms, checks, and invoices.
- Trucks, license plates, and uniforms
- Truck, office, every job, and on all equipment
- Trucks, invoices, and advertising
23: The critical temperature of a refrigerant gas occurs when
- any increase in pressure will not liquefy the gas
- any decrease in pressure will cause condensation
- the gas is no longer saturated
- the gas returns to a liquid
24: After setting up a forward curved fan for the desired conditions, something happened to lower the total static pressure the fan had to operate against. Which would occur?
- CFM and RPM decrease
- CFM and HP decrease
- CFM and HP increase
- RPM and CFM increase
25: Atmospheric pressure is equal to
- 29.92" Hg
- 14.7 psia
- 14.7 psig
- both a & b