Topics: All categories in the pool
1: 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
- lift voltage
- boost voltage
- pick-up voltage
- run voltage
2: 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
- 455 psig, 185 psig.
- 226 psig, 68 psig
- 257 psig, 77 psig
- 365 psig, 120 psig
3: In a horizontal shell & tube condenser, the ammonia is liquefied by
- passing thru the tubes from top to bottom
- water sprayed over condenser
- removing the latent heat of vaporization
- removing the latent heat of fusion
4: Setting a pressure relief device shall not exceed ___ of the design pressure
- 75%
- 90%
- 100%
- 80%
5: When using nitrogen for brazing, the pressure should be:
- Very low
- 125 psig
- 50-100 psig
- Slightly below atmospheric
6: Pi equals approximately
- 12,000
- 746
- 3.14
- 3.41
7: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
8: What happens after your initial inspection of a pressure vessel?
- Inspector leaves a metal tag with a certification listed on it
- Notify the AHJ to let them know that the system been inspected
- There is a temporary shut-down until a final inspection can be performed.
- Notify the Fire Marshal that the system has been inspected and approved
9: The difference between saturated liquid and saturated vapor is
- pressure
- temperature
- volume
- heat
10: A micron is
- one millonths of a micrometer
- one millonths of a centimeter
- one thousandths of a millimeter
- a larger unit of measurement than Hg
11: Joints in refrigeration piping must be _____ before being covered?
- Inspected
- Leak tested
- Insulated
- Pressurized
12: Electricity involves the movement of electrons in atoms
- True
- False
13: 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
14: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.
- the atmosphere
- a de-pressurized recovery tank with a silver top and yellow bottom
- a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
- All of the above
15: A motor starter contains a thermal overload and a
- solenoid
- 3-way relay
- transformer
- contactor
16: What is the voltage of each leg of a 480 Volt three-phase motor?
- 240v
- 277v
- 120v
- 208v
17: One watt of electrical energy in a resistive heater will provide _____ BTU/hr
- 6.830
- 16.64
- 3.415
- 34.15
18: The most common type of motor starter is
- part winding starter
- across the line starter
- duel-winding starter
- delts-wye starter
19: Which refrigerant class listed below is the most flammable?
- A-1
- C-3
- A-3
- B-2
20: A motor starter is a device that includes an overload and a _______?
- contactor
- 2-pole contacts
- duel-coil
- all of the above
21: R-22 is classified as a ____ refrigerant on the safety matrix.
- A-2
- A-1
- B-2
- B-1
22: Calculate the voltage in a series circuit when the total amperage is 10 amps and the resistors have values of: R1=12 ohms, R2=8 ohms, R3=4 ohms
- 2,400 volts
- 2.40 volts
- 240 volts
- 24.0 volts
23: The actual expansion curve of compression follows most nearly which one of the following curves?
- Adiabatic
- Isothermal
- Volume Temperature
- Pressure Temperature
24: On an air cooled condenser, if the ambient air is 35F and dropping, what's its effect to the condensor?
- it would make the condenser less efficient
- it would cause the condenser to sweat
- it would make the condenser more efficient
- it would have no effect on the condenser
25: The start winding has _____ turns than the run winding.
- more
- less
- the same
- none of the above