Topics: All categories in the pool
1: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- shall not be prohibited
- of Group B2 refrigerant shall be prohibited
- shall be prohibited
2: Capacity control on an absorption system is typically accomplished by varying the
- speed of the chilled water circulatory pump
- pressure setting on the system's rupture disc
- speed of the condenser water circulator pump
- rate at which heat is supplied to the generator
3: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
4: An electronic bridge circuit is basically a
- 24 volt control circuit
- Wheatstone
- high voltage circuit
- suspension
5: What would be the classification of a prison?
- Industrial
- Institutional
- Large mercantile
- Place of assembly
6: The purpose of a receiver is
- a vessel to store refrigerant outside the system
- to increase the capacity that the system can hold
- to use a a later date
- all of the above
7: What is the amp draw of a 40 VA transformer at 24 volts
- 1,000 amps
- 1.6 amps
- 106 amps
- 1K amps
8: How many groups of refrigerants are there?
- 7
- 5
- 3
- 1
9: Bubbles in the liquid line sight glass could be caused by
- bad low pressure switch
- leaking discharge valves in the compressor
- plugged drier
- overcharge of oil
10: "E" represents _____ in the Watt's law formula.
- amperage
- voltage
- reactance
- watts
11: 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
12: Ammonia is under what safety classification?
- B1
- A3
- B2
- B3
13: A class B2 refrigerant is considered
- toxic and non-flammable
- non-toxic and highly flammable
- toxic and somewhat flammable
- non-toxic and non-flammable
14: Class T machine room
- has no flame producing apparatus permanently installed
- shall have remote controls to stop the action of the refrigerant compressor
- shall have refrigerant leak detecting systems installed inside and outside the room
- shall include closets used for setting equipment
15: Copper and its alloys shall not be used with ammonia
- True
- False
16: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are
- gate or globe valves
- ball valves
- companion or block valves
- king valves
17: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- the high side
- 2.5 times the design pressure
- the low side
- the aggregate of the high side and low side
18: Low ambient controls are used when
- when systems run all year round
- economizers are used
- on air conditioning systems only
- always
19: When must refrigeration system covered by the code be inspected?
- Annually
- Not required
- Annually and when installed
- Upon installation
20: All low-pressure chillers use which type of compressor?
- Rotary
- Reciprocating
- Centrifugal
- Scroll
21: A run capacitor is wired in series with the _____ windings.
- start capacitor
- start
- common
- run
22: What is an example of institutional occupancy?
- Hospital
- Shopping mall
- Dorms
- Football stadium
23: What is the leaving chilled water set point for water chiller systems?
- 38F
- 45F
- 55F
- 66F
24: What is considered a cooling agent?
- any liquid used for the transmission of heat without condensation
- any liquid used for the transmission of heat without vaporization
- any liquid used for the transmission of heat when vaporization occurs
- any liquid used for the transmission of heat when condensation occur
25: A start capacitor in series with a start winding will
- increase running efficiency
- increase starting torque
- increase the amp draw of the motor
- decrease the amp draw of the motor