Topics: All categories in the pool
1: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
- 350
- 50
- 100
- 550
2: When energized, a normally open relay will be
- closed
- open
- depends on the type and class of the relay
- noisy
3: Indirect systems using Group II refrigerants
- 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 in excess of 1,000 lbs
- shall be used in refrigeration system less than 1,000 lbs
4: Which winding have the most turns?
- Start
- depends on the motor phase
- run
- they have equal amount of turns
5: Ohm's Law indicates Amps X Resistance = ___________.
- Ohms
- Volts
- Impedance
- Current
6: On an air cooled condenser, if the ambient air is 35F and dropping, what's its effect to the condensor?
- it would make the condenser more efficient
- it would make the condenser less efficient
- it would have no effect on the condenser
- it would cause the condenser to sweat
7: The rupture disc on a low-pressure chiller typically releases pressure at
- 15 psig
- 0 psig
- 10 psig
- 5 psig
8: Ammonia is under what safety classification?
- A3
- B2
- B3
- B1
9: How many CFMs are required per square foot of commercial office occupied space
- 5 CFM
- 20 CFM
- .5 CFM
- 15 CFM
10: When should a relief valve start to function?
- Before the purge station discharges
- At it's set pressure
- 10 psi before it's set pressure
- Two times it's working pressure
11: What is the leaving chilled water set point for water chiller systems?
- 38F
- 45F
- 55F
- 66F
12: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- place sign, check for leaks, insulate
- nothing must be done
- make sure it's compatible, notify owner, notify A.H.J
- you can't change refrigerants
13: When a refrigeration or air conditioning system is installed
- it shall not be operated below prescribed pressures
- a field inspection shall be made before it is put into service
- the form of certificate shall be authorized by the Department of Pubic safety
- it shall be approved by the owner for proper operation.
14: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
15: Dew point is
- the temperature of air of 50% RH
- the temperature below which water vapor in the air will start to condense
- the temperature above which water vapor in the air will start to condense
- the temperature below which water vapor in the air will start to evaporate
16: A check valve is a device
- designed to allow the flow of refrigerant gas in both directions
- that is always spring loaded
- with a pressure drop
- found on high pressure steam systems
17: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
18: Class 3 refrigerants are
- non-toxic
- highly flammable
- toxic
- non-flammable
19: A mercury bulb controller is not recommended for
- line or low voltage use
- use where vibration is severe
- low voltage use
- line voltage use
20: A High-Probability 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
- is a system highly likely to leak form a failed connection or component of such system
21: A secondary coolant is defined as
- any liquid used for the transmission of heat without a change of state in A/C refrigeration systems having flash point above 150F
- any refrigerant direcly in contact with the cooling space for process cooling
- a combination of interconnected parts from a closed circuit in where fluid is circulated for the purpose of cooling for a refrigeration system.
- a low temperature refrigerant used for cascading systems
22: Clearance volume
- affects compressor capacity
- has no effect on compressor capacity
- is the same on all compressors
- varies depending on compressor speed
23: A 3-cubic foot receiver must have what type of relief valve?
- fusible plug
- relief valve
- rupture device
- none of the above
24: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Place sign, check for leaks, and insulate suction line
- Nothing must be done
- you can never change refrigerants
- Make sure its compatible, notify owner, and notify AHJ.
25: The outer portion of shell of the compressor used on low-pressure chillers is called the
- suction
- nozzle
- volute
- baffle