Topics: All categories in the pool
1: How far from the ground does a relief valve need to be?
- At least 25' above grade
- Not more than 3' above grade
- At least 20' above grade
- At least 15' above grade
2: Transformers are rated in
- volts
- volt-amps
- amps
- volts-ohms
3: In a motor, an internal overload might open if
- there's an excess current draw through the motor
- there was a high pressure refrigerant was used for a low pressure system.
- there's an open start winding
- there's a direct short
4: The maximum permissible amperage draw for a 40VA transfomer with a secondary voltage of 24V is
- 1.2
- .8
- 1.7
- .1
5: The oil separator is always inserted in the system
- where it can be easily serviced
- in a cool spot
- to prevent oil logging
- in the discharge line
6: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-113
- R-11
- R-12
- R-22
7: A VRF system is a direct system
- true
- false
8: Secondary refrigerants are usually
- alcohol
- water or brine
- expensive
- Prestone anti-freeze
9: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- annually
- quarterly
- bi-annually
- regularly
10: What are the three components of a transformer?
- Primary core, secondary coil, and high and low voltage connectors.
- Primary coil, secondary coil, and core
- Primary coil, secondary coil, and copper contacts
- Contacts, secondary coil, and core
11: One atmosphere equals
- 29.4
- 0 psia
- 0 psig
- 14.7
12: The solution that is pumped into the concentrator in an absorption chiller is referred to as the
- weak solution
- absorbed solution
- concentrated solution
- strong solution
13: _____ and its alloys are suitable for use with ammonia systems.
- Zinc
- Aluminum
- Copper
- Magnesium
14: 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
15: The high side float assembly meters refrigerant into the evaporator through the
- upper chamber of the low side
- lower chamber of the low side
- lower chamber of the high side
- upper chamber of the high side
16: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a
- commercial occupancy
- mercantile occupancy
- public assembly occupancy.
- business occupancy
17: What is the minimum size wire you can use on a 30 amp circuit?
- 10 AWG
- 16 AWG
- 14 AWG
- 12 AWG
18: 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
19: How many gallons of water do you need per pound of ammonia?
- 50
- 100
- 10
- 1
20: R-22 falls under which safety classification?
- B-2
- A-2
- A-1
- B-1
21: Low-side system leaks in a low-pressure chiller will often result in
- nitrogen leaking out of the system.
- air being pulled into the system
- system refrigerant leaking from the system
- water being pulled into the system
22: Sensible heat is the heat added to a substance to
- change its state
- raise its temperature
- cause evaporation
- freeze it
23: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct
24: On a 460V motor, what is he MAXIMUM voltage that can be safely applied to it?
- 506v
- 550v
- 660v
- None of the above
25: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be
- 50.2 psig
- 66.1 psig
- 70.8 psig
- 43.3 psig