Topics: All categories in the pool
1: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?
- 240v
- 208v
- 120v
- 277v
2: In a low temperature refrigeration system, the benefit of the system using P.A.G. oil is
- it is hydroscopic
- it traps moisture
- viscosity
- all of the above
3: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 110
- 1,000
- 330
- 6.6
4: When energized, a normally open relay will be
- depends on the type and class of the relay
- open
- noisy
- closed
5: "E" represents _____ in the Watt's law formula.
- amperage
- reactance
- watts
- voltage
6: A class B1 refrigerant is considered
- toxic and somewhat flammable
- non-toxic but highly flammable
- non-toxic and non-flammable
- toxic but non-flammable
7: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
8: A professional or office building would be considered what type of occupancy?
- business
- commercial
- public assembly
- mercantile
9: 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
10: The difference between saturated liquid and saturated vapor is
- temperature
- heat
- volume
- pressure
11: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.
- 100
- 400
- 250
- 350
12: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use pressure relief devices or fusible plugs
- do not need pressure relief protection
- shall use fusible plugs
- shall use pressure relief devices
13: The two float-type metering devices are the
- vapor float and the low-side float.
- liquid float and the low-side float
- high-side float and the low-side float
- liquid float and the vapor float
14: Oils, classified as to source, are
- animal, vegetable, and castor
- animal, vegetable, and mineral
- naphthalene, mixed, and paraffin
- naphthalene, paraffin, and castor
15: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is
- run voltage
- lift voltage
- boost voltage
- pick-up voltage
16: When a refrigeration or air conditioning system is installed
- the form of certificate shall be authorized by the Department of Pubic safety
- it shall be approved by the owner for proper operation.
- it shall not be operated below prescribed pressures
- a field inspection shall be made before it is put into service
17: The heat picked up in the evaporator must equal to
- the heat of compression
- the heat gained by the condenser
- the heat lost by the medium being cooled
- the heat giving by the condenser
18: An air conditioning system rated for 36,000 BTU's is equivalent to
- 12,000 tons of cooling
- one ton of cooling
- two tons of cooling
- three tons of cooling
19: The External equalizer of a TXV compensates for
- pressure drop across the condenser coil
- pressure within the system
- pressure drop across the evaporator coil
- pressure within the evaporator
20: What refrigerant were phased out in 2004?
- R-134a
- R-11
- R-12
- R-22
21: What is Absolute Zero?
- -400F
- -773F
- -460F
- -640F
22: A motor starter is a device that includes an overload and a _______?
- contactor
- 2-pole contacts
- duel-coil
- all of the above
23: How many closing forces operate a thermostatic expansion valve?
- 1
- 2
- 4
- 3
24: Absolute pressure is
- Gauge Pressure
- Atmospheric Pressure
- Gauge + Atmospheric Pressure + Pi
- none of the above
25: Which oil is hydoscopic?
- mineral
- polyolester
- SW30
- animal