Topics: All categories in the pool
1: A class B2 refrigerant is considered
- toxic and non-flammable
- non-toxic and non-flammable
- toxic and somewhat flammable
- non-toxic and highly flammable
2: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- III
- 10
- 25
- 15
3: What is the purpose of a surge capacitor on a contactor?
- to protect low voltage equipment
- to keep the contactor pulled in
- to balance the sine waves
- to provide smoother start/stops
4: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a
- public assembly occupancy.
- business occupancy
- mercantile occupancy
- commercial occupancy
5: The heat picked up in the evaporator must equal to
- the heat of compression
- the heat giving by the condenser
- the heat gained by the condenser
- the heat lost by the medium being cooled
6: A class A3 refrigerant is considered
- toxic and somewhat flammable
- non-toxic and non-flammable
- non-toxic but highly flammable
- toxic and non-flammable
7: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of
- the ASME Boiler and Pressure Vessel Code
- Section 11.3.1.5 ASHRAE 15 Standard
- the ANSI Standard 10.7.2
- both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5
8: A water regulating valve opens when
- the compressor is on
- when the power is on
- the head pressure rises
- when the power is on there is an overcharge of refrigerant
9: Suction valve unloaders afford an effective means of
- capacity control
- refrigerant control
- superheat control
- evaporator control
10: A positive displacement compressor is
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
- is a reciprocating type compressor with 2 or more pistons
11: A Category D fluid
- is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
- is when the design pressure does not exceed 150 psi
- a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
- Both a and b are correct
12: Materials used in construction and installation materials used in the manufacture or installation of refrigerating equipment shall be suitable for conveying refrigerant and the refrigerant oils and will not deteriorate in the presence of what?
- Oil and water
- Water and soap
- Moisture and air
- Air and dirt
13: Oils, classified as to source, are
- naphthalene, paraffin, and castor
- animal, vegetable, and castor
- animal, vegetable, and mineral
- naphthalene, mixed, and paraffin
14: High side floats are used on centrifugal chiller systems are are considered critically charged systems.
- True
- are obsolete.
- False
- depends on the type of refrigerant being used
15: Industrial occupancy is
- a premise or that portion of a premise that is not open to the public, where access by authorized persons is controlled, and that is used to manufacture, process, or store goods, such as chemicals, food, ice, meat, or petroleum.
- is a premise or that portion of a premise where large number of people congregate and from which occupants cannot quickly vacate the space.
- a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
- Both a and b are correct
16: Heat that changes the physical state of a substance without effecting a change in its temperature is known as
- lost heat
- latent heat
- sensible heat
- specific heat
17: What is the minimum height refrigeration piping should be placed against walls?
- 72"
- 7.25'
- 6'
- Ceiling height
18: A Low-Probability System
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is such that a leak of refrigerant from a failed connection can not enter the occupied space
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is a system highly likely to leak form a failed connection or component of such system
19: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- T&P device
- Relief valve
- Temperature limiter device
- Circuit Breaker
20: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 3
- 2
- 5
- 1
21: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 33
- 22
- 50
- 18
22: What refrigerant is an inorganic compound?
- R-410A
- Ammonia
- R-132A
- R-22
23: Viscosity is
- the ability of oil to flow
- the coefficient of external friction
- measure of weight
- a measure of heat content
24: How many volts would you read on a 480V system phase to phase?
- 480
- 0
- 1/3 the voltage
- 277
25: The purpose of an accumulator is to
- assure no liquid returns to the compressor
- filter out impurities from the system
- reduce friction loss to the flow of refrigerant
- store excess refrigerant from the reciver