Topics: All categories in the pool
1: When an A/C system is excessively low on refrigerant
- it can become contaminated with water
- there can be nuisance trip outs
- the suction line may be too hot to touch
- All of the above
2: Which creates more of a heat load?
- 70% RH
- 30% RH
- 50% RH
- 90% RH
3: How many forces operate a thermostatic expansion valve?
- 3
- 4
- 2
- 1
4: 1 HP = ____ Watts?
- 3,412
- 11,239
- 3.1416
- 746
5: How are refrigerant blends classified?
- Based on the oil used
- Blends don't have to be classified
- Based on best case Fractionation
- Based on worst case fractionation
6: 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
7: What is the leaving chilled water set point for water chiller systems?
- 38F
- 45F
- 66F
- 55F
8: What instrument is used to measure very high resistance?
- ammeter
- tape measure
- voltmeter
- meg ohmmeter
9: A professional or office building would be considered what type of occupancy?
- commercial
- mercantile
- public assembly
- business
10: A High-Probablity system
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is a system highly likely to leak from a failed connection or component of such system
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
- is such that a leak of refrigerant from failed connections will enter the occupied space
11: Can you use Ammonia in industrial applications?
- Yes, always
- Yes, Under certain condidtions
- When mixed with R-718
- No, never
12: The amount of heat required to raise the temperature of 1 lb of water 1F is?
- 1 BTU
- The rate of conduction
- 1 Kelvin
- 1 Therm
13: Ammonia can come in contact with _______ ?
- Brass
- Copper
- Aluminum
- Copper tubing
14: Which of the following is a drop-in for R-22
- R-410A
- R-134A
- R407C
- None of the above
15: A split-phase motor has a ______ winding and a ____ winding
- start, common
- run, common
- duel-run, duel-start
- run, start
16: Machinery rooms must be vented to ______?
- basement
- neutralizing tank
- unoccupied spaces
- outdoors
17: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- shall be prohibited
- shall not be prohibited
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- of Group B2 refrigerant shall be prohibited
18: What kind of system uses two different refrigerants in separate systems dependent on each other?
- R-414B
- Simple
- Cascade
- Low pressure
19: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
20: What measures gas pressure?
- Barometer
- Hygrometer
- Manometer
- Hydrometer
21: What would be the classification of a prison?
- Place of assembly
- Industrial
- Institutional
- Large mercantile
22: A normal operating evaporator temperature of R-22 for air conditioning is typically
- 55F
- 32F
- 58F
- 45F
23: A solder joint melts at temperatures of
- less than 400F
- 600F to 900F
- 1,200F to 1,500F
- 400F to 800F
24: What type refrigerant is NOT ozone depleting?
- CFC
- Halon
- HFC
- HCFC
25: R-11 belongs to Group
- B-3
- A-1
- B-1
- A-2