Topics: All categories in the pool
1: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.
- 75
- 15
- 50
- 20
2: 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
3: How many refrigerant classifications are there for toxicity?
- 2
- 3
- 1
- 5
4: Systems containing more than 110 pounds must have stop valves located at the
- compressor suction inlet
- compressor discharge outlet
- receiver inlet and outlet
- All of the above
5: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?
- checking the level of refrigerant in the system
- testing for oil in the system
- testing for moisture in the system
- none of the above
6: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
7: 1 HP = ____ Watts?
- 746
- 3.1416
- 11,239
- 3,412
8: Which of the following controllers would you expect to be most sensitive to temperature changes?
- line voltage t-stat
- immersion controller
- low voltage t-stat
- aquastat
9: The heat picked up in the evaporator must equal to
- the heat gained by the condenser
- the heat of compression
- the heat giving by the condenser
- the heat lost by the medium being cooled
10: A thermometer inside a duct measures ____ heat.
- specific
- sensible
- hidden
- latent
11: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into
- the low-pressure side of the system
- the high side of the system
- the liquid receiver
- both a and c are correct
12: How would you know if there was a loss of crankcase pressure?
- oil will foam
- oil level will rise
- oil will thin out
- oil will thicken
13: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 5.5
- 2.0
- 3.0
- 2.5
14: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 1
- 1.2
- 2.2
- 1.5
15: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)
- Pressure gauge
- Temperature gauge
- Sight glass gauge
- All of the above
16: 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
17: Class A refrigerants are considered
- non-flammable
- toxic
- non-toxic
- flammable
18: 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
- boost voltage
- lift voltage
- pick up voltage
- run voltage
19: In a motor, an internal overload might open if
- there's a direct short
- there's an open start winding
- there was a high pressure refrigerant was used for a low pressure system.
- there's an excess current draw through the motor
20: Crankcase heaters are energized
- while the compressor is running
- to prevent compressor freeze-up
- to allow easy compressor start-up
- when the compressor is off
21: "I" represents ____ in the Ohm's law formula.
- voltage.
- resistance
- capacitance
- amperage
22: If two 500 ohm resistors are connected in series, the resistance will be
- 500 ohms
- 1000 ohms
- 200 ohms
- 20 ohms
23: Where is an EPR valve located on a multi-evaporator system?
- Suction line prior to the accumulator of the lowest temperature system
- Suction line of the warmest evaporator
- Suction line of the coolest evaporator
- Suction line at the compressor
24: When the compressor is below the condensor
- traps are not needed on this type of system
- traps are needed on the suction line
- traps are needed on the oil return line
- traps are needed on the discharge line
25: A High-Probablity system
- is such that a leak of refrigerant from failed connections will enter the occupied space
- 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 failed connections will enter the unoccupied space
- is a system highly likely to leak from a failed connection or component of such system