Topics: All categories in the pool
1: Ammonia (NH3) is a group III refrigerant
- True
- False
2: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to
- Pumpdown procedures are not allowed with systems containing liquid recievers
- release the charge when the pressure exceeds 310 psig or higher
- receive the pumpdown charge
- hold up to 110% of the pumpdown charge
3: What is the purpose of a surge capacitor on a contactor?
- to provide smoother start/stops
- to protect low voltage equipment
- to balance the sine waves
- to keep the contactor pulled in
4: What measures gas pressure?
- Barometer
- Hygrometer
- Manometer
- Hydrometer
5: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against
- 38
- 116
- 88
- 108
6: It takes how many BTU/hr to melt one pound of ice at 32F
- 212
- 144
- 180
- 970
7: 14.7 psia is equivalent to
- atmospheric pressure at seal level
- 29.92" Hg
- 0 psig
- All of the above.
8: The rupture disc on a low-pressure chiller typically releases pressure at
- 15 psig
- 5 psig
- 0 psig
- 10 psig
9: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.
- 75
- 20
- 15
- 50
10: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a
- mercantile occupancy
- business occupancy
- commercial occupancy
- public assembly occupancy.
11: Brazed joints melt at temperatures above
- 1,000F
- 800F
- 1,200F
- 500F
12: Class 3 refrigerants are
- highly flammable
- non-toxic
- non-flammable
- toxic
13: A VRF system is a direct system
- true
- false
14: How many flammability classifications are refrigerants in?
- 7
- 2
- 5
- 3
15: Joints in refrigeration piping must be _____ before being covered?
- Pressurized
- Leak tested
- Insulated
- Inspected
16: What are the three components of a transformer?
- Primary coil, secondary coil, and copper contacts
- Primary core, secondary coil, and high and low voltage connectors.
- Primary coil, secondary coil, and core
- Contacts, secondary coil, and core
17: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- relief plug
- fusible plug
- fusion plug
- rupture plug
18: What refrigerant doesn't have to be classifted?
- R-711
- R-717
- R-134a
- R-718
19: If your suction line is warmer than the room temperature, this may indicate
- an over charge
- below normal superheat
- plugged air filter
- a low charge
20: Where is the high-side float located on a chiller system?
- liquid line
- discharge line
- inside the chiller barrel
- flash line
21: At higher altitudes, the boiling point of refrigerant is
- the same
- equal to the coefficient of water at 32F
- higher
- lower
22: A micron is
- one thousandths of a millimeter
- a larger unit of measurement than Hg
- one millonths of a micrometer
- one millonths of a centimeter
23: 746 watts is equal to
- Pi
- 10 hp
- 1 hp
- 100 hp
24: "E" represents _____ in the Watt's law formula.
- amperage
- reactance
- watts
- voltage
25: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.
- 80
- 100
- 90
- 110