Topics: All categories in the pool
1: Ammonia is under what safety classification?
- B3
- B1
- A3
- B2
2: Pi equals approximately
- 3.14
- 12,000
- 3.41
- 746
3: Three-phase motors have what type of windings?
- three start windings
- three run windings
- one start winding and one run winding.
- three run windings and 3 start windings
4: R-410A can segregate in the system or chemically change its composition due to a leak.
- True
- False
5: Heat cannot of itself, pass from a
- cold to a warmer body
- warm to a colder body
- state of hot energy to a state of cold energy
- None of the above
6: What is R-290’s ASHRAE safety code?
- A2
- A3
- B1
- B2
7: Refrigerants shall be classified by
- toxicity and flammability
- color codes
- maximum permissible quantities of each group
- requirements for commercial, industrial, and residential occupancies
8: 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
9: If you have a motor of 2 HP or less and under 300V, you can use a single pole switch (snap switch) with at least what rating?
- 4x FLA
- 2x FLA
- 5x FLA
- 1x FLA
10: How many forces operate a thermostatic expansion valve?
- 3
- 2
- 4
- 1
11: High side floats are used on centrifugal chiller systems are are considered critically charged systems.
- False
- True
- depends on the type of refrigerant being used
- are obsolete.
12: A R-410A system running with a condensing temperature of 110F and 50F evaporator temperature will read pressures of ___ on the high side and ___ on the low side
- 226 psig, 68 psig
- 455 psig, 185 psig.
- 365 psig, 120 psig
- 257 psig, 77 psig
13: A moisture indicator must
- be sight side up
- be yellow
- change color when exposed to moisture
- be filled with liquid
14: R-11 belongs to Group
- B-3
- B-1
- A-2
- A-1
15: There can be no airflow from an occupied space through a machine room unless what?
- System is high velocity
- System is ducted and sealed
- Duct is not located in the ceiling
- None of the above.
16: "E" represents _____ in the Watt's law formula.
- voltage
- watts
- amperage
- reactance
17: 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
18: Megaohm meters can detect a ground in the
- up to 1,000 ohms
- up to 1,000,000 ohms
- up to 10,000 ohms
- 10,000,000 ohms or higher
19: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and balanced head and friction head
- GPM and unbalanced head and friction head
- GPM, pipe size, and equivalent head.
- GPM and friction head
20: When an electronic bridge is in balance the bridge output will be
- 1 volt
- .01 volts
- 0 volts
- 15 volts
21: One atmosphere equals
- 0 psig
- 29.4
- 0 psia
- 14.7
22: Humidity can be sensed with
- human hair
- thermometer
- bimetal
- pressure bellows
23: R-410A is classified as a ____ refrigerant on the safety matrix.
- A-2
- B-1
- A-1
- B-2
24: The main cause of enacting the "no vending rule" of July 1st 1992 was
- global warming potential
- ozone depletion
- both a & b
- None of the above
25: Viscosity is
- a measure of heat content
- the coefficient of external friction
- measure of weight
- the ability of oil to flow