Topics: All categories in the pool
1: What must be done if refrigeration lines pass through a concrete floor?
- installed through a pipe casing
- moisture barrier
- insulated
- leak checked
2: All machine rooms must be outfitted with a detector that _______?
- activates an audible alarm
- activates a visual alarm
- starts the ventilation system
- All of the above
3: When using nitrogen for brazing, the pressure should be:
- 50-100 psig
- Slightly below atmospheric
- 125 psig
- Very low
4: R-410A is classified as a ____ refrigerant on the safety matrix.
- B-1
- B-2
- A-2
- A-1
5: What type of fuses must be used on a HVAC system?
- TR Type, Duel Element, Time Delay
- Fast blow
- 10% lower than RLA
- none of the above
6: Where is an EPR valve located on a multi-evaporator system?
- Suction line of the coolest evaporator
- Suction line at the compressor
- Suction line prior to the accumulator of the lowest temperature system
- Suction line of the warmest evaporator
7: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
- do not need pressure relief protection
- shall use pressure relief devices
8: What is specific heat?
- measured heat
- heat required to raise the temperature of 1lb of a substance 1 degree
- the specific heat required to change the state of one cubic foot of air to steam
- none of the above
9: A hotel is considered a _______ occupancy.
- commercial
- residential
- institutional
- mercantile
10: Watt's Law indicates Volts X Amps = _________.
- Ohms
- Resistance
- Watts
- Current
11: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against
- 88
- 38
- 116
- 108
12: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above
13: 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
- lift voltage
- boost voltage
- pick up voltage
- run voltage
14: Thermodynamics is the branch of science that deals with
- molecular therory
- energy due to motion
- heat energy
- state of energy
15: What is potential measured in?
- Ohms
- Volts
- Henrys
- Amps
16: What is a megaohm meter?
- An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
- Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.
- An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested
- An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
17: Which of the following is an inorganic refrigerant?
- R-22
- Ammonia
- Chlorofluorocarbons
- All of the above
18: A direct system
- is where the refrigerant comes in contact with the space refrigerated
- is a self-contained complete factory made and tested system
- is on where brine is cooled & circulated to the space refrigerated
- is one which encloses a separate body of evaporative refrigerant
19: A declaration test is needed when the system contains more than
- 110 lbs
- 65 lbs
- 120 lbs
- 55 lbs
20: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
21: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
- refrigerant sensing
- CO Sensing
- A group sensing
- phosgene gas sening
22: 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
23: A positive displacement compressor is
- is a reciprocating type compressor with 2 or more pistons
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
24: If a condenser is on a roof and the temperature is 35F and dropping the capacity
- increases
- doesn't change
- run as designed with low ambient controls
- decreases
25: NH3 is
- lithium bromide
- R-718
- ammonia
- R-508A