Topics: All categories in the pool
1: What is Trichlorotrifluoromethane?
- R-113
- R-12
- R-11
- R-13
2: How far from the ground does a relief valve need to be?
- At least 15' above grade
- Not more than 3' above grade
- At least 25' above grade
- At least 20' above grade
3: 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
4: What is the boiling point of refrigerant governed by?
- Compressor RPM's
- P&T relationship
- Condenser sub-cooling
- Evaporator temperature
5: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)
- 77F
- 70F
- 58F
- 32F
6: Trichlorofluoromethane is the name of what refrigerant?
- R-113
- R-11
- R-12
- R-502
7: How many refrigerant classifications are there for toxicity?
- 1
- 5
- 2
- 3
8: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
9: On a TXV, the purpose of an external equalizer is to?
- Increase the pressure on the top of the power head diaphragm
- balance the evaporator load
- allow a greater adjustment spam
- compensate for a pressure drop across the evaporator coil
10: Transformers are rated in
- volts
- volt-amps
- volts-ohms
- amps
11: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- shall be prohibited
- of Group B2 refrigerant shall be prohibited
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- shall not be prohibited
12: The instrument used to measure the specific gravity of absorption chiller solutions is the
- refractometer
- hydrometer
- Psychrometer
- anemometer
13: E = I X R is
- Amps Law
- Ohms Law
- Impedance Law
- Watts Law
14: Gauge pressure is
- what a gauge reads when checking pressures on a chilled water system.
- absolute pressure
- atmospheric pressure
- force of pressure above that of atmospheric
15: Before replacing a seized compressor, the _______ should be determinded.
- type of refrigerant
- designed head pressure
- current draw
- cause of seizure
16: What happens to copper joints when overheated?
- nothing
- joint becomes oxidized and ditorted
- copper becomes harder
- none of the above
17: What was the main reason for enacting the no venting rule of July 1, 1992?
- Ozone depletion
- Green house effect
- Global warming potential
- All of the above
18: R-11 has the greatest corrosive effect on
- Aluminum
- Bronze
- Magnesium
- Copper
19: Pressure is equivalent of
- Force
- Force / Area
- Force X Area
- Area X Force
20: The most common type of motor starter is
- delts-wye starter
- across the line starter
- part winding starter
- duel-winding starter
21: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
- Class B machinery room
- Class M machinery room
- Class A machinery room
- Class T machinery room
22: If your suction line is warmer than the room temperature, this may indicate
- plugged air filter
- an over charge
- below normal superheat
- a low charge
23: What is used to check very low pressure?
- Manometer
- Hygrometer
- Hydrometer
- Velometer
24: How many gallons of water do you need per pound of ammonia?
- 50
- 100
- 10
- 1
25: How much clearance do you need around the perimeter of electrical panels?
- 12"
- 18"
- 36"
- 24"