Topics: All categories in the pool
1: A moisture indicator must
- be yellow
- be sight side up
- be filled with liquid
- change color when exposed to moisture
2: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
3: Which of the following controllers would you expect to be most sensitive to temperature changes?
- immersion controller
- aquastat
- low voltage t-stat
- line voltage t-stat
4: What should never be used in pressure testing refrigeration systems?
- Oxygen
- Compressed air
- Nitrogen
- Both a and b
5: When an inspection is needed, how often must it be done?
- annually
- every 18 months
- every 36 months
- every 24 months
6: How many different groups of refrigerants are there?
- 7
- 15
- 3
- 11
7: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UV or UR
- UL and UM
- UL and UR
- UM or UL
8: The color code of a tank of ammonia is
- lavender
- silver
- light green
- white
9: A restaurant is classified as a
- mixed occupancy
- public assembly occupancy
- large mercantile occupancy
- commercial occupancy
10: What is an example of institutional occupancy?
- Shopping mall
- Dorms
- Hospital
- Football stadium
11: Which creates more of a heat load?
- 70% RH
- 30% RH
- 50% RH
- 90% RH
12: Where is the high-side float located on a chiller system?
- flash line
- inside the chiller barrel
- discharge line
- liquid line
13: The amount of heat required to raise the temperature of 1 lb of water 1F is?
- 1 Therm
- The rate of conduction
- 1 Kelvin
- 1 BTU
14: Which of the following most closely represents the concentration of Li-Br in a absorption system?
- 50% Li-Br, 50% tap water
- 40% Li-Br, 60% distilled water
- 60% Li-Br, 40% distilled water
- 40% Li-Br, 60% tap water
15: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?
- 100
- 1,000
- 10,000
- 100,000
16: 1 HP = ____ Watts?
- 746
- 3.1416
- 11,239
- 3,412
17: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of
- low head pressure
- moisture in the system
- not enough oil in the system
- oil in evaporator
18: A capacitor in series with the start windings will do what?
- Increase run efficiency by 10% of its rating
- Nothing
- Increase starting torque
- Decrease the RLA to within 10% of its rating
19: The actual expansion curve of compression follows most nearly which one of the following curves?
- Isothermal
- Adiabatic
- Volume Temperature
- Pressure Temperature
20: 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
21: How is bring measured?
- hydrometer
- anemometer
- manometer
- hygrometer
22: R-123 belongs to Group
- B-2
- B-1
- B-3
- A-3
23: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- high pressure
- low pressure
- design pressure
- critical pressure
24: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is
- 29F
- 11F
- 9F
- 21F
25: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?
- 27 ohms
- 71 ohms
- 104 ohms
- 80 ohms