Topics: All categories in the pool
1: What is the refrigerant dichlorodifluoromethane?
- R-134A
- R-22
- R-123
- R-12
2: A direct system
- is one which encloses a separate body of evaporative refrigerant
- 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
3: Where is an EPR valve located on a multi-evaporator system?
- Suction line prior to the accumulator of the lowest temperature system
- Suction line at the compressor
- Suction line of the warmest evaporator
- Suction line of the coolest evaporator
4: A pressure relief should be located at least _______ from windows and doors.
- 15'
- 25'
- 30'
- 20'
5: Copper and its alloys shall not be used with ammonia
- True
- False
6: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?
- 20 amps
- 5 amps
- 15 amps
- 10 amps
7: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- public assembly occupancy
- mixed occupancy
- institutional occupancy
- commercial occupancy
8: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 22
- 18
- 50
- 33
9: 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
10: 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
11: Pressure relief valves shall be marked with the data from
- Section IV Division of the ASME Boiler & Pressure Code
- Section XIII Division of the ASME Boiler & Pressure Code
- Section VIII Division of the ASME Boiler & Pressure Code
- Section I Division VIII of ASME Boiler & Pressure Code
12: How far from the ground does a relief valve need to be?
- At least 20' above grade
- Not more than 3' above grade
- At least 15' above grade
- At least 25' above grade
13: The principle used in continuous type absorption systems is
- Charles's Law
- Dalton's Law
- Boyle's Law
- Ohm's Law
14: Indirect systems using Group II refrigerants
- shall be used for mechanical equipment only
- shall be used in refrigeration system less than 1,000 lbs
- shall be used in refrigeration system in excess of 1,000 lbs
- shall have all refrigerant containing parts except piping, installed in a Class T machine room
15: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
16: Booster compressors, pump refrigerant into the
- low side of the primary compressor
- high side of the secondary compressor
- receiver
- heat & plate heat exchanges
17: One watt of electrical energy in a resistive heater will provide _____ BTU/hr
- 3.415
- 34.15
- 6.830
- 16.64
18: Direct systems using Group II refrigerants
- shall not be used for air condition for human comfort
- shall be allowed to be used for human comfort.
- shall be installed per instruction of the AHJ
- shall be installed in Class T machinery rooms
19: The solution that leaves the concentrator in an absorption chiller is referred to as the
- weak solution
- diluted solution
- absorbed solution
- strong solution
20: When must refrigeration system covered by the code be inspected?
- Upon installation
- Not required
- Annually and when installed
- Annually
21: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
- 7.00'
- 7.25'
- 8'4"
- 9.00'
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
- 2.40 volts
- 2,400 volts
- 240 volts
- 24.0 volts
23: Low-side system leaks in a low-pressure chiller will often result in
- air being pulled into the system
- system refrigerant leaking from the system
- water being pulled into the system
- nitrogen leaking out of the system.
24: A motor starter contains a thermal overload and a
- contactor
- transformer
- solenoid
- 3-way relay
25: What pipe can not be used for refrigeration?
- K
- L
- N
- M