Topics: All categories in the pool
1: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
2: The formula for Pure Power in a resistance circuit is
- Watts X amps.
- Watts X power factor
- Watts = volts X amps
- Kw = volts X amps
3: A motor starter contains a thermal overload and a
- solenoid
- contactor
- 3-way relay
- transformer
4: Trichlorofluoromethane is the name of what refrigerant?
- R-502
- R-12
- R-11
- R-113
5: The main cause of enacting the "no vending rule" of July 1st 1992 was
- global warming potential
- ozone depletion
- both a & b
- None of the above
6: When should a relief valve start to function?
- Two times it's working pressure
- Before the purge station discharges
- 10 psi before it's set pressure
- At it's set pressure
7: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.
- 15
- 20
- 25
- 10
8: Which winding have the most turns?
- run
- Start
- depends on the motor phase
- they have equal amount of turns
9: What type of relief valve is used on low pressure centrifugal compressor systems?
- Spring-loaded relief valve
- Rupture disc
- Purge relief
- None of the above
10: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a
- public assembly occupancy.
- business occupancy
- commercial occupancy
- mercantile occupancy
11: A single pole-double throw switch used how many wires excluding the ground wire?
- two
- three
- five
- four
12: Large mercantile occupancy is
- a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
- a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
13: When energized, a normally open relay will be
- depends on the type and class of the relay
- open
- closed
- noisy
14: All low-pressure chillers use which type of compressor?
- Reciprocating
- Rotary
- Centrifugal
- Scroll
15: Color is important in oil because
- it makes sight glasses easy to read
- allows you to see into crankcase
- it indicates the viscoisty.
- can tell us something about the refining of oil
16: A rule of thumb in air conditioning is ____ CFM per ton?
- 100
- 500
- 600
- 400
17: Brazed joints melt at temperatures above
- 1,200F
- 1,000F
- 800F
- 500F
18: Low pressure systems have what kind of compressor?
- Rotary
- Centrifugal
- Reciprocating
- Scroll
19: A self contained system
- is a complete factory made and tested system
- is a unit system Group II refrigerants only
- is a unit system Group I refrigerants only
- is any system or part of a system used to increase evaporation by expansion or vaporization
20: How much refrigerant can be stored in a mechanical room outside of the system?
- 100
- 150
- 330
- 200
21: Heat is a form of
- matter
- energy
- power
- work
22: Calculate the voltage in a series circuit when the total amperage is 10 amps and the resistors have values of: R1=12 ohms, R2=8 ohms, R3=4 ohms
- 24.0 volts
- 2,400 volts
- 2.40 volts
- 240 volts
23: No open flames are allowed in the machinery room unless?
- Approved by the authorized person
- Only when combustion air is provided from outside of the machinery room
- Never can be allowed
- Approved by the installing contractor
24: A normal operating evaporator temperature of R-22 for air conditioning is typically
- 55F
- 32F
- 58F
- 45F
25: How many gallons of water per pound of ammonia do you need?
- 5
- 20
- 15
- 1