Topics: All categories in the pool
1: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?
- 15 amps
- 10 amps
- 5 amps
- 20 amps
2: The absorber shell contains the
- condenser and the generator
- condenser and the absorber
- condenser, the evaporator, and the generator
- evaporator and the absorber
3: What happens after your initial inspection of a pressure vessel?
- Inspector leaves a metal tag with a certification listed on it
- There is a temporary shut-down until a final inspection can be performed.
- Notify the AHJ to let them know that the system been inspected
- Notify the Fire Marshal that the system has been inspected and approved
4: The location of a thermal bulb of a TXV affects
- the amount of liquid returning to the compressor
- the amount of liquid in the condenser.
- subcooling
- the amount of liquid refrigerant in the evaporator
5: A relief valve discharge capacity is rated in
- PSIA
- Pounds of air per minute.
- temperature minus pounds of air per second divided by release rate squared
- PSIG
6: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
7: Where is the high-side float located on a chiller system?
- inside the chiller barrel
- liquid line
- flash line
- discharge line
8: By using nitrogen within a pipe during brazing operation,
- Exterior scale formation is minimized
- Discoloration is prevented
- Copper oxide formation is prevented
- The explosion hazard is confined
9: What type of relief valve is used on a CO2 system?
- glove disc
- gate valve
- rupture disc
- fusible plug
10: Pressure vessels nameplate markings must be compliant with the
- ASHRAE 34 Standards
- CMR-588 & CMR-528
- ASME Boiler and Pressure Vessel Code
- All of the Above
11: Refrigerants shall be classified by
- toxicity and flammability
- maximum permissible quantities of each group
- color codes
- requirements for commercial, industrial, and residential occupancies
12: Which of the following is not an air velocity meter?
- Velometer
- Anemometer
- Anemotherm
- Hydrometer
13: What is a megaohm meter?
- An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested
- An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
- An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
- Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.
14: What is not a requirement of a Class T machine room?
- Self-closing doors
- Fire hose connected to the building fire protection system.
- Tight fitting doors
- Automatic ventilation
15: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against
- 116
- 88
- 108
- 38
16: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- relief plug
- fusible plug
- fusion plug
- rupture plug
17: On a ammonia compressor, the pressure of a forced fed oil pump is changed by varying the
- adjustment of the spring tension of the TXV
- cooling temperature set-point
- opening at the pump outlet
- opening at the pump inlet
18: Joints in refrigeration piping must be _____ before being covered?
- Leak tested
- Insulated
- Inspected
- Pressurized
19: In a system designed for sub-zero ambient temperatures, what must be added?
- Infrared dye for leak identification
- Low-ambient kit
- Booster compressor
- Nitrogen
20: Humidity can be sensed with
- bimetal
- human hair
- pressure bellows
- thermometer
21: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
22: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
- higher
- the same
- lower
- there is no Group B1 refrigerants
23: What effect does the temperature of air have on humidity?
- warmer air holds more moisture then cooler air
- cooler air holds more moisture then warmer air
- air has no effect of humidity
- none of the above
24: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
25: If a halide torch is used for leak detection, what color is the flame if it detects a leak?
- orange
- green
- red
- blue