Topics: All categories in the pool
1: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use pressure relief devices or fusible plugs
- shall use pressure relief devices
- do not need pressure relief protection
- shall use fusible plugs
2: A halide torch is most useful with a freon compression system
- to remove from from TXV's and evaporator coils
- to sweat flanges on the refrigeration piping
- to release a sticking valve
- to detect refrigeration leaks in piping joints
3: Dual-pressure relief devices should be installed on
- vessels of 10 cubic feet or more
- vessels of 10 cubic feet or less
- vessels of 3 cubic feet or less
- vessels of 3 cubic feet or more
4: Which has more turns in the windings: Start windings or Run windings?
- Start windings
- Run windings
- They both have the exact same turns
- Depends on the system and capacitor used
5: Calculate the voltage in a series circuit when the total amperage is 10 amps and the resistors have values of: R1=12 ohms, R2=8 ohms, R3=4 ohms
- 2.40 volts
- 240 volts
- 24.0 volts
- 2,400 volts
6: When an electronic bridge is in balance the bridge output will be
- 15 volts
- 1 volt
- .01 volts
- 0 volts
7: Brazed joints melt at temperatures above
- 800F
- 1,200F
- 500F
- 1,000F
8: While the system is operating, the discharge line should be
- room temperature
- 10-15F warmer than ambient
- too hot to hold by hand
- at the same temperature as the crankcase
9: An azeotropic refrigerant is
- a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
- a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
- a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
- none of the above
10: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?
- 5KW
- 600 watts
- 746 watts
- 1000 watts
11: Oils, classified as to source, are
- naphthalene, paraffin, and castor
- animal, vegetable, and castor
- animal, vegetable, and mineral
- naphthalene, mixed, and paraffin
12: Who authorizes changes to the safety codes?
- Person in charge of the facility
- Contractor who last serviced the system.
- Person who pulled the permit
- Board of Boilers
13: A professional or office building would be considered what type of occupancy?
- mercantile
- public assembly
- commercial
- business
14: What is the refrigerant chlorodifluoromethane?
- R-123
- R-12
- R-134a
- R-22
15: A tachometer is an instrument used to measure
- static pressure
- air velocity
- RPM
- speed
16: In designing duct work, pressure and ______ need to be considered
- length
- CFM
- duct sealant used
- all of the above
17: RPM's of a centrifugal compressor are at approximately?
- 500
- 30,000
- 10,000
- 15,000
18: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- rupture plug
- relief plug
- fusible plug
- fusion plug
19: When energized, a normally open relay will be
- depends on the type and class of the relay
- open
- closed
- noisy
20: 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
21: All welding done on any refrigeration system or piping covered by 522 CMR 9.00 shall be performed by a according to Section IX of the ASME code
- competent welder
- licensed technician
- welder qualified
- licensed welder
22: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?
- 1/2"
- 5/8"
- 3/8"
- 3/4"
23: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and balanced head and friction head
- GPM and unbalanced head and friction head
- GPM and friction head
- GPM, pipe size, and equivalent head.
24: How do you find net oil pressure on a compressor?
- discharge pressure - suction pressure
- gross oil pressure - suction pressure
- gross oil pressure - discharge pressure
- all of the above
25: What would be the classification of a church?
- Institutional
- Industrial
- Large mercantile
- Place of assembly