Topics: All categories in the pool
1: A moisture indicator must
- change color when exposed to moisture
- be yellow
- be filled with liquid
- be sight side up
2: The difference between saturated liquid and saturated vapor is
- pressure
- heat
- volume
- temperature
3: How many closing forces operate a thermostatic expansion valve?
- 4
- 2
- 1
- 3
4: E = I X R is
- Ohms Law
- Amps Law
- Impedance Law
- Watts Law
5: A High-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 a leak of refrigerant from a failed connection will enter an unoccupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
6: A compressor that increases vapor pressure by changing the internal volume of the compression chamber is called?
- Positive displacement
- Low Pressure displacement
- Pressure induced displacement.
- Non-positive displacement
7: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
8: What must be done if refrigeration lines pass through a concrete floor?
- installed through a pipe casing
- moisture barrier
- insulated
- leak checked
9: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
10: What kind of system uses two different refrigerants in separate systems dependent on each other?
- Cascade
- Low pressure
- Simple
- R-414B
11: What happens after your initial inspection of a pressure vessel?
- Notify the Fire Marshal that the system has been inspected and approved
- There is a temporary shut-down until a final inspection can be performed.
- Inspector leaves a metal tag with a certification listed on it
- Notify the AHJ to let them know that the system been inspected
12: No open flames are allowed in the machinery room unless?
- Approved by the installing contractor
- Never can be allowed
- Only when combustion air is provided from outside of the machinery room
- Approved by the authorized person
13: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig
- 327 psig
- 365 psig
- 255 psig
- 125 psig
14: Which of the following is not an air velocity meter?
- Hydrometer
- Anemotherm
- Anemometer
- Velometer
15: On a day with low relative humidity, the two thermometers on a sling psychrometer will read
- far apart or greater difference
- 2F difference
- a ling psychrometer doesn't have two theremometers.
- nearly the same
16: 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
17: What is the purpose of suction/discharge traps?
- to ensure proper oil return to the compressor
- to keep oil inside the evaporator for proper oil return to the compressor
- to keep oil inside of the accumulator for proper return to the compressor
- all of the above
18: What happens to copper joints when overheated?
- nothing
- joint becomes oxidized and ditorted
- copper becomes harder
- none of the above
19: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are
- companion or block valves
- king valves
- gate or globe valves
- ball valves
20: Ammonia belongs to Group
- A-2
- B-1
- A-1
- B-2
21: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and unbalanced head and friction head
- GPM, pipe size, and equivalent head.
- GPM and balanced head and friction head
- GPM and friction head
22: When a refrigeration or air conditioning system is installed
- a field inspection shall be made before it is put into service
- it shall be approved by the owner for proper operation.
- the form of certificate shall be authorized by the Department of Pubic safety
- it shall not be operated below prescribed pressures
23: By using nitrogen within a pipe during brazing operation,
- The explosion hazard is confined
- Exterior scale formation is minimized
- Discoloration is prevented
- Copper oxide formation is prevented
24: The heat picked up in the evaporator must equal to
- the heat giving by the condenser
- the heat of compression
- the heat lost by the medium being cooled
- the heat gained by the condenser
25: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is
- reset the safety valve
- reset the expansion valve
- start the fan and circulating pump
- start the comrpessor