Topics: All categories in the pool
1: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
2: Megaohm meter's main function is
- to detect weak motor winding insulation of a refrigeration or air conditioning compressor by creating high DC voltages to the compressor
- to detect very high resistances to ground of refrigeration or air conditioning compressors
- to test very high value capacitors for large 3-phase refrigeration compressors and blower motors.
- Both a and b are correct
3: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
4: The Board of Boilers adopts by reference
- MSCA Code
- Montreal Protocol Safety Code
- the 1997 ANSI/ASHRAE Safety Code
- the MACS Pressure Vessel Code of Massachusetts
5: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.
- 55
- 15
- 50
- 75
6: A Lithium-bromide system is an absorption system that
- uses salts as an absorbent and lithium bromide as a refrigerant
- uses water as a refrigerant and lithium bromide as an absorbent
- uses water as a absorbent and lithium bromide as a refrigerant
- uses ammonia as a refrigerant and lithium bromide as an absorbent
7: The best way to detect ammonia in brine is
- nessler regaent
- CO2 gas
- carbonation of soda
- potassium of line
8: Which is considered the more efficient condenser?
- fan cooled
- air cooled
- water cooled
- spray cooled
9: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.
- ammonia
- HCFC-123
- Lithium bromide
- CFC-11
10: Class 3 refrigerants are
- highly flammable
- toxic
- non-flammable
- non-toxic
11: The freezing point of water at sea level is?
- -10C
- 32F
- 0F
- 32C
12: A relief valve shall be located at least ___ above grade.
- 36'
- 10'
- 15'
- 25'
13: A motor starter is a device that includes an overload and a _______?
- contactor
- 2-pole contacts
- duel-coil
- all of the above
14: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into
- the low-pressure side of the system
- the high side of the system
- the liquid receiver
- both a and c are correct
15: How many refrigerant classifications are there for flammability?
- 7
- 2
- 3
- 1
16: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
- the return air ducted system
- the outdoors
- the mechanical room housing the refrigeration system
- Machinery rooms need not be vented
17: What pipe can not be used for refrigeration?
- N
- K
- M
- L
18: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 700F
- 800F
- 1000F
- 600F
19: R-12 is
- dichloromethane
- dichlorodifluoromethane
- dichlorofluoromethane
- thichlorodiflourethane
20: What is the voltage of each leg of a 480 Volt three-phase motor?
- 208v
- 120v
- 240v
- 277v
21: What's the purpose of a megahmmeter?
- 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
22: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?
- 20 amps
- 10 amps
- 5 amps
- 15 amps
23: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
24: Ammonia is under what safety classification?
- A3
- B3
- B2
- B1
25: Electricity involves the movement of electrons in atoms
- True
- False