Topics: All categories in the pool
1: A low oil switch is typically
- automatic reset
- non used on semi-hermetic compressors over 10 ton capacity
- time-delay auto reset
- manual reset
2: What is the voltage of each leg of a 480 Volt three-phase motor?
- 277v
- 208v
- 240v
- 120v
3: The Department that certifies the transportation of refrigerant is the
- EPA
- RSES
- DOT
- EPO
4: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
5: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.
- 50
- 100
- 75
- 24
6: The equivalent length of pipe in a water piping system is
- the total length of pipe as you would measure it
- the total length of pipe as you would measure it plus 25% for fittigns
- the total length of pipe plus equivalent of fittings multiplied by 2.31
- the total length of pipe plus equivalent-length of fittings
7: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-22
- R-12
- R-113
- R-11
8: R-11 has the greatest corrosive effect on
- Bronze
- Magnesium
- Copper
- Aluminum
9: Megaohm meters can detect a ground in the
- up to 1,000 ohms
- up to 10,000 ohms
- up to 1,000,000 ohms
- 10,000,000 ohms or higher
10: How many groups of refrigerants are there?
- 7
- 3
- 5
- 1
11: Materials used in construction and installation materials used in the manufacture or installation of refrigerating equipment shall be suitable for conveying refrigerant and the refrigerant oils and will not deteriorate in the presence of what?
- Air and dirt
- Oil and water
- Moisture and air
- Water and soap
12: The main purpose of a refrigerant detector in a machinery room is to
- inform there is a refrigerant leak int he system
- detect toxins in the air caused by a refrigerant leak
- to set off an alarm when there is refrigerant present inside the room
- all of the above
13: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?
- 600 watts
- 746 watts
- 1000 watts
- 5KW
14: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to
- receive the pumpdown charge
- release the charge when the pressure exceeds 310 psig or higher
- Pumpdown procedures are not allowed with systems containing liquid recievers
- hold up to 110% of the pumpdown charge
15: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When its white
- When it's used as part of a supply or return air system
- When there are sprinklers above
- When there is a space 6' or more above it
16: The solution that is pumped into the concentrator in an absorption chiller is referred to as the
- concentrated solution
- strong solution
- absorbed solution
- weak solution
17: On a pumpdown system, the liquid-line solenoid is controlled by the
- low pressure switch
- thermostat
- low-ambient controller
- defrost timer
18: A Low-Probability System
- is a system highly likely to leak form a failed connection or component of such system
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is such that a leak of refrigerant from a failed connection can not enter the occupied space
19: Which of the following types of oils are hygroscopic?
- polyolester (POE)
- polyalkylene glycol (PAG)
- naphthene mineral
- both a and b
20: 1 HP = ____ Watts?
- 11,239
- 746
- 3,412
- 3.1416
21: A hotel is considered a _______ occupancy.
- mercantile
- residential
- institutional
- commercial
22: A class B1 refrigerant is considered
- non-toxic and non-flammable
- non-toxic but highly flammable
- toxic but non-flammable
- toxic and somewhat flammable
23: Fractionation occurs when
- the pressures increase as the heat load increases
- when a fraction of refrigerant is added as the full charge
- the pressures decreases as the heat load decreases
- some of the blended refrigerant evaporates or condenses before the rest of the blend
24: Pi equals approximately
- 3.41
- 3.14
- 746
- 12,000
25: On a large centrifugal system, what meters the flow to the evaporator?
- TXV
- Cap tube.
- High side float
- Low side float