Topics: All categories in the pool
1: The solution that is pumped into the concentrator in an absorption chiller is referred to as the
- concentrated solution
- absorbed solution
- strong solution
- weak solution
2: How far from the ground does a relief valve need to be?
- Not more than 3' above grade
- At least 20' above grade
- At least 15' above grade
- At least 25' above grade
3: What are the three components of a transformer?
- Contacts, secondary coil, and core
- Primary coil, secondary coil, and copper contacts
- Primary coil, secondary coil, and core
- Primary core, secondary coil, and high and low voltage connectors.
4: Who authorizes changes to the safety codes?
- Contractor who last serviced the system.
- Person in charge of the facility
- Person who pulled the permit
- Board of Boilers
5: A class B1 refrigerant is considered
- non-toxic but highly flammable
- toxic and somewhat flammable
- non-toxic and non-flammable
- toxic but non-flammable
6: When energized, a normally open relay will be
- closed
- noisy
- open
- depends on the type and class of the relay
7: Institutional occupancy is
- a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
- a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
- a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
- None of the above
8: How can you test mechanical strength of an electrical connection?
- measure ohms with an electrical meter
- measure voltage across the connection
- attempt to pull the wire from the connector by hand
- none of the above.
9: How many refrigerant classifications are there for toxicity?
- 5
- 3
- 2
- 1
10: Total heat of a substance is considered
- specific heat
- enthalpy
- empathetical
- sensible heat
11: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- rupture plug
- fusion plug
- fusible plug
- relief plug
12: When the compressor is below the condensor
- traps are needed on the discharge line
- traps are needed on the suction line
- traps are needed on the oil return line
- traps are not needed on this type of system
13: Which oil is hydoscopic?
- animal
- polyolester
- mineral
- SW30
14: In a motor, an internal overload might open if
- there's a direct short
- there was a high pressure refrigerant was used for a low pressure system.
- there's an open start winding
- there's an excess current draw through the motor
15: "E" references ____ in the Ohm's law formula
- amperage
- resistance
- voltage
- capacitance
16: Which of the following controllers would you expect to be most sensitive to temperature changes?
- immersion controller
- low voltage t-stat
- aquastat
- line voltage t-stat
17: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.
- 6.6, 6.6
- 2.5, 2.5
- 2.5, 3.0
- 3.0, 3.5
18: A hissing noise at the expansion valve is a good indication that
- gas is passing thru it
- liquid is passing thru it
- nothing is passing thru
- expansion valve is oversized
19: What refrigerant doesn't have to be classified?
- R-422A
- R-717
- R-718
- R-134A
20: The best way to determine the voltage requirement for an electrical component is to
- determine the capacity of the service panel
- read the voltage with a mulitmeter
- check with the utility company
- read the nameplate data
21: Clearance volume
- is the same on all compressors
- has no effect on compressor capacity
- affects compressor capacity
- varies depending on compressor speed
22: What type of pressure relief device is used on a CO2 system?
- Rupture disk
- Glove valve
- Gate valve
- Fusible plug
23: Heat is a form of
- power
- matter
- work
- energy
24: Dual-pressure relief devices should be installed on
- vessels of 3 cubic feet or more
- vessels of 3 cubic feet or less
- vessels of 10 cubic feet or more
- vessels of 10 cubic feet or less
25: What is the maximum voltage range allowed on an electrical circuit?
- 5%
- 20%
- 15%
- 10%