Topics: All categories in the pool
1: A relief valve shall be located at least ___ above grade.
- 36'
- 10'
- 25'
- 15'
2: What is the maximum voltage range allowed on an electrical circuit?
- 5%
- 10%
- 20%
- 15%
3: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig
- 365 psig
- 255 psig
- 125 psig
- 327 psig
4: What will occur if the strong solution in an absorption chiller becomes too strong?
- The machine will stop cooling and the solution will evaporate.
- The machine will stop cooling and solution will crystallize
- The machine will cool excessively as the solution evaporates
- The machine will cool excessively as the solution crystallizes.
5: A 24 volt transformer with a 240 volt primary can handle how many amps?
- There isn't enough information to answer.
- 10 amps
- 24 amps
- 20 amps
6: Pi equals approximately
- 746
- 3.41
- 3.14
- 12,000
7: If a purge unit fails on a low pressure chiller, what are the symptoms?
- low pressure chillers do not have purge units
- high head pressure
- low suction pressure
- increased capacity
8: What type of pressure relief device is used on a CO2 system?
- Fusible plug
- Gate valve
- Glove valve
- Rupture disk
9: An electronic bridge circuit is basically a
- Wheatstone
- high voltage circuit
- suspension
- 24 volt control circuit
10: 1 HP = ____ Watts?
- 746
- 3.1416
- 11,239
- 3,412
11: What is the typical air conditioning operating pressures for 410A?
- 60 psi suction, 210 psi discharge
- 25 psi suction, 125 psi discharge
- 105 psi suction, 350 psi discharge
- None of the above
12: When a refrigeration or air conditioning system is installed
- the form of certificate shall be authorized by the Department of Pubic safety
- it shall not be operated below prescribed pressures
- it shall be approved by the owner for proper operation.
- a field inspection shall be made before it is put into service
13: R-410A is classified as a ____ refrigerant on the safety matrix.
- B-2
- A-2
- A-1
- B-1
14: The color code of a tank of ammonia is
- lavender
- silver
- light green
- white
15: Name three things that must be done when changing refrigeration lubricant?
- Make sure it's compatible, notify owner, notify AHJ
- Nothing must be done
- You can't change lubricants.
- Place sign, check for leaks, insulate
16: How many gallons of water per pound of ammonia do you need?
- 1
- 20
- 15
- 5
17: All machine rooms must be outfitted with a detector that _______?
- activates an audible alarm
- activates a visual alarm
- starts the ventilation system
- All of the above
18: What is the purpose of a surge capacitor on a contactor?
- to provide smoother start/stops
- to protect low voltage equipment
- to keep the contactor pulled in
- to balance the sine waves
19: R-22 falls under which safety classification?
- A-2
- A-1
- B-1
- B-2
20: At higher altitudes, boiling temperatures
- depends on the refrigerant
- increase
- are unaffected
- decrease
21: One watt of electrical energy in a resistive heater will provide _____ BTU/hr
- 3.415
- 34.15
- 16.64
- 6.830
22: Pressure vessels nameplate markings must be compliant with the
- ASHRAE 34 Standards
- CMR-588 & CMR-528
- ASME Boiler and Pressure Vessel Code
- All of the Above
23: On a ammonia compressor, the pressure of a forced fed oil pump is changed by varying the
- opening at the pump outlet
- cooling temperature set-point
- adjustment of the spring tension of the TXV
- opening at the pump inlet
24: 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
25: A cross charged power element on an expansion valve would normally be used in what temperature range?
- -40F to 0F
- -100F to -40F
- 0F-38F
- 30F to 50F