Topics: All categories in the pool
1: 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?
- RPM and CFM increase
- CFM and RPM decrease
- CFM and HP increase
- CFM and HP decrease
2: Pressure is equivalent of
- Force
- Force / Area
- Area X Force
- Force X Area
3: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- fusible plug
- relief plug
- rupture plug
- fusion plug
4: What is absolute humidity?
- the amount of moisture in the air per one pound of 50% RH air
- the amount of moisture in the air in grains of cubic feet of volume
- the amount of moisture in the air in grains of square feet of volume
- none of the above
5: When a refrigerating machinery room is used, the emergency procedures shall be posted
- outside the room, immediately adjacent to each door
- inside the room, immediately adjacent to each door
- on a conspicuous card located near the evaporator
- on a conspicuous card located near the compressor
6: Bubbles in the liquid line sight glass could be caused by
- plugged drier
- bad low pressure switch
- leaking discharge valves in the compressor
- overcharge of oil
7: On a single phase motor, when does the start winding cut out?
- 100% of its RLA speed
- 50% of its RLA speed
- 25% of its RLA speed
- 75% of its RLA speed
8: 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.
- 455 psig, 185 psig
- 350 psig, 120 psig
- 226 psig, 68 psig
- 257 psig, 77 psig
9: The oil separator is always inserted in the system
- in the discharge line
- where it can be easily serviced
- in a cool spot
- to prevent oil logging
10: What type refrigerant is NOT ozone depleting?
- HCFC
- HFC
- CFC
- Halon
11: R-22 is considered a(n)
- HCFC
- CFC
- HFC
- HCFCH
12: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
- refrigerant sensing
- A group sensing
- CO Sensing
- phosgene gas sening
13: Foaming of oil in a compressor is most likely to occur
- when there is insufficient air across the condenser(i.e., dirty coil)
- at start-up
- when the evaporator temperatures are below 32F
- when ambient temperature are low
14: The amount of heat required to raise the temperature of 1 lb of water 1F is?
- The rate of conduction
- 1 BTU
- 1 Kelvin
- 1 Therm
15: What is the maximum voltage range allowed on an electrical circuit?
- 15%
- 10%
- 20%
- 5%
16: Fusible plugs shall not be used with pressure vessels of
- 15 square feet or less
- 3 cubic feet or less
- 3 cubic feet or more
- 15 cubic feet or more
17: Stop valves shall not be permitted between the system and the
- bleed valve
- relief valve
- condenser
- service valve
18: A split-phase motor has a ______ winding and a ____ winding
- run, start
- run, common
- start, common
- duel-run, duel-start
19: Where a refrigeration or air conditioning system is installed,
- it shall not be operated below prescribed pressuers
- A field inspection shall be made before it is put into service
- The company who installed the system must notify the fire department in the jurisdiction where installed
- the form or certificate shall be authorized by the Department of Public Safety
20: When can 50/50 solder be used?
- in the low side
- in the high side
- liquid and suction lines
- none of the above.
21: It takes how many BTU/hr to melt one pound of ice at 32F
- 144
- 180
- 212
- 970
22: If the power element on an expansion valve should lose its charge, the valve would
- Over feed
- Under feed
- Close
- Stay open
23: R-22 is classified as a ____ refrigerant on the safety matrix.
- B-2
- A-1
- A-2
- B-1
24: What type of oil is used in R-410A systems?
- mineral oil
- naphthene
- polyalkylene glycol (PAG)
- polyolester (POE)
25: A cross charged power element on an expansion valve would normally be used in what temperature range?
- -40F to 0F
- 0F-38F
- 30F to 50F
- -100F to -40F