Topics: All categories in the pool
1: Where are the three places that the discharge from an ammonia relief valve be piped?
- To chemical neutralizing tank only
- Underground, into drain, into mechanical room
- Atmosphere, Tank containing water, where the AHJ indicates.
- None of the above.
2: Oils, classified as to source, are
- naphthalene, paraffin, and castor
- naphthalene, mixed, and paraffin
- animal, vegetable, and mineral
- animal, vegetable, and castor
3: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is
- run voltage
- boost voltage
- pick-up voltage
- lift voltage
4: Can you use Ammonia in industrial applications?
- Yes, always
- Yes, Under certain condidtions
- No, never
- When mixed with R-718
5: A single pole-double throw switch used how many wires excluding the ground wire?
- three
- two
- five
- four
6: What happens to copper joints when overheated?
- nothing
- joint becomes oxidized and ditorted
- copper becomes harder
- none of the above
7: A multi-evaporator refrigeration system uses what type of valve to maintain evaporating temperatures?
- EPR valve
- CPR valve
- EEV
- Solenoid valve
8: Which has more turns in the windings: Start windings or Run windings?
- Start windings
- Run windings
- They both have the exact same turns
- Depends on the system and capacitor used
9: Defined process piping by code CMR (528)
- Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
- Any piping in an industrial space
- Any piping in an industrial or commercial space
- All of the above
10: What must be done if refrigeration lines pass through a concrete floor?
- leak checked
- moisture barrier
- insulated
- installed through a pipe casing
11: Mercury was used in thermometers primarily because it
- never freezes
- expands uniformly
- vaporizes at very high temperatures
- was inexpensive
12: What is the amp draw of a 40 VA transformer at 24 volts
- 1.6 amps
- 1K amps
- 106 amps
- 1,000 amps
13: A restaurant is classified as a
- mixed occupancy
- commercial occupancy
- public assembly occupancy
- large mercantile occupancy
14: 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
15: Ammonia systems use ____ pressure to adjust oil pressure
- liquid
- stream
- discharge
- air
16: The solution that is pumped into the concentrator in an absorption chiller is referred to as the
- strong solution
- absorbed solution
- concentrated solution
- weak solution
17: Which is considered the more efficient condenser?
- spray cooled
- air cooled
- water cooled
- fan cooled
18: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?
- 71 ohms
- 27 ohms
- 80 ohms
- 104 ohms
19: When should a relief valve start to function?
- Two times it's working pressure
- At it's set pressure
- 10 psi before it's set pressure
- Before the purge station discharges
20: What is the state of the refrigerant leaving the evaporator?
- a high temperature subcooled liquid
- a high temperature superheated vapor
- low temperature superheated vapor
- a low temperature subcooled liquid
21: What refrigerant were phased out in 2004?
- R-11
- R-22
- R-134a
- R-12
22: Which refrigerant is lighter than air?
- R-134a
- R-717
- R-11
- R-123
23: Capacity control on a centrifugal compressor is accomplished by the
- pre-rotational guide vanes
- check valves
- slide vanes
- post-rotational guide vanes
24: When a refrigerating machinery room is used, the emergency procedures shall be posted
- outside the room, immediately adjacent to each door
- inside the room, immediately adjacent to each door
- on a conspicuous card located near the evaporator
- on a conspicuous card located near the compressor
25: It takes how many BTU/hr to melt one pound of ice at 32F
- 144
- 180
- 212
- 970