Topics: All categories in the pool
1: What effect does the temperature of air have on humidity?
- warmer air holds more moisture then cooler air
- cooler air holds more moisture then warmer air
- air has no effect of humidity
- none of the above
2: 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
- boost voltage
- pick-up voltage
- lift voltage
- run voltage
3: What refrigerant is an inorganic compound?
- R-410A
- R-132A
- R-22
- Ammonia
4: Excessive head pressure is often caused by
- insufficient refrigerant
- leaking reed valve on the discharge side
- air cooled condenser is plugged
- thermostat set too high
5: Which refrigerant is lighter than air?
- R-123
- R-11
- R-717
- R-134a
6: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-11
- R-113
- R-22
- R-12
7: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within
- 1 week
- 30 days
- 2 months
- 14 days
8: How many flammability classifications are refrigerants in?
- 2
- 5
- 3
- 7
9: How far from the window does a relief valve need to be according to ASHRAE-15?
- At least 20'
- There is no minimum for relief valve and windows.
- At least 30'
- At least 40'
10: E = I X R is
- Ohms Law
- Amps Law
- Impedance Law
- Watts Law
11: What is used to check very low air pressures in air conditioning duct?
- Barometer
- Vacuum gauge
- Manometer
- Anemomter
12: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- over pressure protection and a rupture disc
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
- over pressure protection as well as a temperature protection device
- over pressure protection
13: 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
- Notify the Fire Marshal that the system has been inspected and approved
- There is a temporary shut-down until a final inspection can be performed.
14: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
15: What happens to copper joints when overheated?
- nothing
- joint becomes oxidized and ditorted
- copper becomes harder
- none of the above
16: Pressure vessels having an inside diameter of 6” or less shall be protected by
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
- a pressure relief device
- either a fusible plug or a pressure relief device
- a fusible plug
17: In a system designed for sub-zero ambient temperatures, what must be added?
- Nitrogen
- Infrared dye for leak identification
- Low-ambient kit
- Booster compressor
18: High side floats are used on centrifugal chiller systems are are considered critically charged systems.
- False
- are obsolete.
- depends on the type of refrigerant being used
- True
19: A start capacitor is wired in _____ with the start windings.
- series-parallel
- junction
- series
- parallel
20: 1 Watt = ______ BTU's?
- 4.482
- 3.412
- 7.216
- 12
21: How would you know if there was a loss of crankcase pressure?
- oil will thicken
- oil will thin out
- oil level will rise
- oil will foam
22: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- no flames shall be permitted
- explosion precautions must be taken
- gas masks must be worn
- the owner shall be informed
23: The high side float assembly meters refrigerant into the evaporator through the
- lower chamber of the low side
- lower chamber of the high side
- upper chamber of the high side
- upper chamber of the low side
24: A single pole-double throw switch used how many wires excluding the ground wire?
- three
- five
- two
- four
25: An accumulator can be located between the
- compressor and condenser
- evaporator and compressor
- first stage and second stage compressors
- condenser and evaporator