Topics: All categories in the pool
1: One ton of refrigeration is defined as ______ btu/minute.
- 200
- 60
- 720,000
- 12,000
2: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)
- 58F
- 70F
- 32F
- 77F
3: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UM or UL
- UL and UR
- UV or UR
- UL and UM
4: What is specific heat?
- measured heat
- heat required to raise the temperature of 1lb of a substance 1 degree
- the specific heat required to change the state of one cubic foot of air to steam
- none of the above
5: Low pressure chiller systems use what type of compressor?
- Screw
- Reciprocating
- Scroll
- Centrifugal
6: The solution that is pumped into the concentrator in an absorption chiller is referred to as the
- concentrated solution
- weak solution
- strong solution
- absorbed solution
7: 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
8: A split-phase motor has a ______ winding and a ____ winding
- run, start
- duel-run, duel-start
- start, common
- run, common
9: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with
- R-718
- methyl chloride
- ammonia
- trichlorotrifluoromethane
10: Thermodynamics is the branch of science that deals with
- heat energy
- molecular therory
- state of energy
- energy due to motion
11: What is an example of institutional occupancy?
- Hospital
- Shopping mall
- Football stadium
- Dorms
12: A class B2 refrigerant is considered
- toxic and non-flammable
- non-toxic and non-flammable
- non-toxic and highly flammable
- toxic and somewhat flammable
13: Ammonia systems use ____ pressure to adjust oil pressure
- air
- discharge
- liquid
- stream
14: In designing duct work, pressure and ______ need to be considered
- length
- CFM
- duct sealant used
- all of the above
15: 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
16: What's the purpose of a megohmmeter?
- To measure low to very low resistance values
- To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
- To measure very high resistances
- None of the above
17: What must be done to all doors and access points in duct work going through a mechanical room?
- Must be hindged
- Must be screwed shut
- Must be sealed and gasketed
- All of the above
18: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?
- 1/2"
- 3/4"
- 5/8"
- 3/8"
19: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- the owner shall be informed
- explosion precautions must be taken
- gas masks must be worn
- no flames shall be permitted
20: The purpose of a receiver is
- a vessel to store refrigerant outside the system
- to increase the capacity that the system can hold
- to use a a later date
- all of the above
21: A device used to measure small pressure differences is the
- pyrometer
- phsycometirc
- anemometer
- manometer
22: What refrigerant has zero ozone depletion
- HFC
- CFC
- HCFC
- None of the above
23: How many volts would you read on a 480V system phase to phase?
- 277
- 480
- 1/3 the voltage
24: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
25: On a large centrifugal system, what meters the flow to the evaporator?
- Cap tube.
- Low side float
- TXV
- High side float