Topics: All categories in the pool
1: An air conditioning system rated for 36,000 BTU's is equivalent to
- two tons of cooling
- three tons of cooling
- one ton of cooling
- 12,000 tons of cooling
2: When must refrigeration system covered by the code be inspected?
- Not required
- Upon installation
- Annually and when installed
- Annually
3: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
4: Who authorizes changes to the safety codes?
- Contractor who last serviced the system.
- Person in charge of the facility
- Person who pulled the permit
- Board of Boilers
5: In an A/C unit, dirty filters will cause
- high discharge pressure
- high suction pressur
- low oil pressure
- low suction pressure
6: The start winding has _____ turns than the run winding.
- more
- less
- the same
- none of the above
7: All electrical work done on refrigeration systems must comply with
- NEC and Massachusetts Modifications
- OSHA
- Department of Energy
- ASHREA-15 Section 9.2.1
8: How many forces operate a thermostatic expansion valve?
- 3
- 2
- 1
- 4
9: Dew point is
- the temperature above which water vapor in the air will start to condense
- the temperature below which water vapor in the air will start to evaporate
- the temperature below which water vapor in the air will start to condense
- the temperature of air of 50% RH
10: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.
- HCFC-123
- ammonia
- Lithium bromide
- CFC-11
11: What is the minimum height refrigeration piping should be placed against walls?
- 72"
- 7.25'
- 6'
- Ceiling height
12: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
13: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UL and UR
- UV or UR
- UM or UL
- UL and UM
14: Pipe identification labels are required when the system contains more than
- 65 lbs
- 120 lbs
- 55 lbs
- 110 lbs
15: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
16: On a day with low relative humidity, the two thermometers on a sling psychrometer will read
- 2F difference
- a ling psychrometer doesn't have two theremometers.
- nearly the same
- far apart or greater difference
17: The formula for Pure Power in a resistance circuit is
- Watts = volts X amps
- Kw = volts X amps
- Watts X power factor
- Watts X amps.
18: A cross charged power element on an expansion valve would normally be used in what temperature range?
- -100F to -40F
- -40F to 0F
- 30F to 50F
- 0F-38F
19: What must be done if refrigeration lines pass through a concrete floor?
- installed through a pipe casing
- leak checked
- moisture barrier
- insulated
20: A direct system
- is a self-contained complete factory made and tested system
- is where the refrigerant comes in contact with the space refrigerated
- is on where brine is cooled & circulated to the space refrigerated
- is one which encloses a separate body of evaporative refrigerant
21: What is used to check very low pressure?
- Hygrometer
- Manometer
- Hydrometer
- Velometer
22: On a TXV, the purpose of an external equalizer is to?
- compensate for a pressure drop across the evaporator coil
- allow a greater adjustment spam
- Increase the pressure on the top of the power head diaphragm
- balance the evaporator load
23: All low-pressure chillers use which type of compressor?
- Rotary
- Centrifugal
- Scroll
- Reciprocating
24: A R-22 system running with a condensing temperature of 110F and a 40F evaporator temperature will read pressures of ____ on the high side and ____ on the low side.
- 350 psig, 120 psig
- 455 psig, 185 psig
- 257 psig, 77 psig
- 226 psig, 68 psig
25: How many gallons of water per pound of ammonia do you need?
- 1
- 5
- 20
- 15