Topics: All categories in the pool
1: Gauge pressure is
- Atmospheric pressure
- Absolute pressrue
- Force of pressure above that of atmosphere
- Barometric pressure
2: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?
- 240v
- 120v
- 208v
- 277v
3: The leaving chilled water set point for comfort cooling is typically?
- 45
- 38
- 66
- 60
4: A Category D fluid
- is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
- is when the design pressure does not exceed 150 psi
- a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
- Both a and b are correct
5: How far from the window does a relief valve need to be according to ASHRAE-15?
- At least 20'
- At least 30'
- There is no minimum for relief valve and windows.
- At least 40'
6: Liquid level gauges must be provided with what?
- A red line
- A low level mark
- A relief valve
- Automatic shut-offs
7: When an A/C system is excessively low on refrigerant
- it can become contaminated with water
- there can be nuisance trip outs
- the suction line may be too hot to touch
- All of the above
8: The proper location for an oil separator is between the
- evaporator and compressor
- condenser and receiver
- compressor and condenser
- receiver and metering device
9: The maximum permissible amperage draw for a 40VA transfomer with a secondary voltage of 24V is
- .8
- .1
- 1.7
- 1.2
10: Suction valve unloaders afford an effective means of
- superheat control
- capacity control
- refrigerant control
- evaporator control
11: Which of the following is an example of an azeotropic refrigerant?
- R-404A
- R-134A
- R-410A
- R-500
12: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 330 lbs.
- 660 lbs
- 55 lbs
- 550 lbs
13: How many refrigerant classifications are there for toxicity?
- 5
- 1
- 2
- 3
14: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.
- the atmosphere
- a de-pressurized recovery tank with a silver top and yellow bottom
- a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
- All of the above
15: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
16: A halide torch is most useful with a freon compression system
- to remove from from TXV's and evaporator coils
- to sweat flanges on the refrigeration piping
- to detect refrigeration leaks in piping joints
- to release a sticking valve
17: Where would the EPR valve be located on a multiple evaporator system?
- outlet of low temperature evaporator
- inlet of the low temperature evaporator.
- outlet of high temperature evaporator
- outlet of the liquid line
18: Direct systems using Group II refrigerants
- shall be installed per instruction of the AHJ
- shall be installed in Class T machinery rooms
- shall not be used for air condition for human comfort
- shall be allowed to be used for human comfort.
19: An electronic bridge circuit is basically a
- high voltage circuit
- suspension
- 24 volt control circuit
- Wheatstone
20: What is the refrigerant chlorodifluoromethane?
- R-12
- R-22
- R-134a
- R-123
21: What is not a requirement of a Class T machine room?
- Fire hose connected to the building fire protection system.
- Tight fitting doors
- Self-closing doors
- Automatic ventilation
22: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?
- Flush with ammonia
- Flush with R-11
- Flush with RX-11
- Flush with R-718
23: Indirect systems using Group II refrigerants
- shall be used in refrigeration system in excess of 1,000 lbs
- shall be used for mechanical equipment only
- shall have all refrigerant containing parts except piping, installed in a Class T machine room
- shall be used in refrigeration system less than 1,000 lbs
24: Refrigerant is metered into the evaporator on a large centrifugal chiller thru the
- low side of the system
- high side float assembly
- cap tube
- none of the above
25: What refrigerant doesn't have to be classified?
- R-717
- R-718
- R-422A
- R-134A