Topics: All categories in the pool
1: What is the minimum height refrigeration piping should be placed against walls?
- 6'
- 72"
- 7.25'
- Ceiling height
2: What measures gas pressure?
- Hydrometer
- Hygrometer
- Barometer
- Manometer
3: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- does not require a pressure-limiting device
- shall be inspected by the Boiler of Inspectors bi-annually
- shall have a pressure limiting device installed on the high side of the system
- shall have a pressure limiting device and a pressure relief valve installed
4: What type of voltage causes the winding in a potential relay to open?
- BEMF (Back Electro-Motive Force)
- 24V control voltage from the thermostat
- 120V line voltage
- None of the above
5: Humidity can be sensed with
- human hair
- thermometer
- pressure bellows
- bimetal
6: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
- True
- False
7: Dual-pressure relief devices should be installed on
- vessels of 10 cubic feet or less
- vessels of 3 cubic feet or more
- vessels of 3 cubic feet or less
- vessels of 10 cubic feet or more
8: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?
- 38
- 58
- 88
- 96
9: Stop valves shall not be permitted between the system and the
- condenser
- service valve
- bleed valve
- relief valve
10: Which refrigerant replaced R-12?
- R-407A
- R-22
- R-134A
- R-410A
11: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to
- Pumpdown procedures are not allowed with systems containing liquid recievers
- release the charge when the pressure exceeds 310 psig or higher
- receive the pumpdown charge
- hold up to 110% of the pumpdown charge
12: In a motor, an internal overload might open if
- there's a direct short
- there was a high pressure refrigerant was used for a low pressure system.
- there's an excess current draw through the motor
- there's an open start winding
13: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- high pressure
- low pressure
- critical pressure
- design pressure
14: Class A refrigerants are considered
- non-toxic
- non-flammable
- flammable
- toxic
15: Who approves containers for refrigerants?
- D.O.T
- D.O.E
- E.P.A
- D.O.D
16: A EPR valve is installed on what type of evaporators?
- plate evaporators
- high-temperature evaporators
- low-temperature evaporators
- shell and tube evaporators
17: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
- Muffler
- Foot valve
- Stop valve
- Moisture indicator
18: How far from the window does a relief valve need to be according to ASHRAE-15?
- At least 40'
- There is no minimum for relief valve and windows.
- At least 30'
- At least 20'
19: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?
- Air
- Heat
- Electricity
- Oil
20: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig
- 255 psig
- 365 psig
- 327 psig
- 125 psig
21: A self contained system
- is any system or part of a system used to increase evaporation by expansion or vaporization
- is a unit system Group II refrigerants only
- is a complete factory made and tested system
- is a unit system Group I refrigerants only
22: The main cause of enacting the "no vending rule" of July 1st 1992 was
- global warming potential
- ozone depletion
- both a & b
- None of the above
23: A cross charged power element on an expansion valve would normally be used in what temperature range?
- 0F-38F
- -100F to -40F
- 30F to 50F
- -40F to 0F
24: The External equalizer of a TXV compensates for
- pressure drop across the evaporator coil
- pressure within the system
- pressure within the evaporator
- pressure drop across the condenser coil
25: Pressure is the equivalent of
- area times force
- force times area
- force per unit area
- force