Topics: All categories in the pool
1: What happens after your initial inspection of a pressure vessel?
- There is a temporary shut-down until a final inspection can be performed.
- Notify the AHJ to let them know that the system been inspected
- Notify the Fire Marshal that the system has been inspected and approved
- Inspector leaves a metal tag with a certification listed on it
2: A mercury bulb controller is not recommended for
- low voltage use
- use where vibration is severe
- line or low voltage use
- line voltage use
3: Megaohm meter's main function is
- to detect weak motor winding insulation of a refrigeration or air conditioning compressor by creating high DC voltages to the compressor
- to detect very high resistances to ground of refrigeration or air conditioning compressors
- to test very high value capacitors for large 3-phase refrigeration compressors and blower motors.
- Both a and b are correct
4: What is an egress?
- A code violation
- A valve put on the low side of the system to prevent frosting
- An entrance or exit
- An escape route
5: How many flammability classifications are refrigerants in?
- 3
- 2
- 5
- 7
6: A EPR valve is installed on what type of evaporators?
- high-temperature evaporators
- low-temperature evaporators
- plate evaporators
- shell and tube evaporators
7: Gauge pressure is
- Atmospheric pressure
- Barometric pressure
- Force of pressure above that of atmosphere
- Absolute pressrue
8: A low oil switch is typically
- automatic reset
- manual reset
- time-delay auto reset
- non used on semi-hermetic compressors over 10 ton capacity
9: 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
10: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?
- 24,000 BTU
- 12,000 BTU
- 970 BTU
- 144 BTU
11: How many opening forces operate a thermostatic expansion valve?
- 3
- 2
- 1
- 4
12: What is a Category "D" fluid?
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
- A typical refrigerant used on newer air conditioning and heat pump ssytems
- Any fluid that exceeds 150 psig and has design temperature of over 366F
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
13: A tachometer is an instrument used to measure
- air velocity
- RPM
- static pressure
- speed
14: A secondary coolant is defined as
- a low temperature refrigerant used for cascading systems
- a combination of interconnected parts from a closed circuit in where fluid is circulated for the purpose of cooling for a refrigeration system.
- any liquid used for the transmission of heat without a change of state in A/C refrigeration systems having flash point above 150F
- any refrigerant direcly in contact with the cooling space for process cooling
15: 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
16: R-11 has the greatest corrosive effect on
- Magnesium
- Bronze
- Copper
- Aluminum
17: The amount of heat required to raise the temperature of 1 lb of water 1F is?
- 1 Kelvin
- The rate of conduction
- 1 Therm
- 1 BTU
18: A split-phase motor has a ______ winding and a ____ winding
- start, common
- run, start
- duel-run, duel-start
- run, common
19: What refrigerant doesn't have to be classified?
- R-422A
- R-718
- R-717
- R-134A
20: What is a megaohm meter?
- An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested
- Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.
- An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
- An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
21: Brazed joints melt at temperatures above
- 1,200F
- 500F
- 1,000F
- 800F
22: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 330
- 1,000
- 6.6
- 110
23: The main purpose of the accumulator is to
- provide space for vapor to accumulate
- store liquid refrigerant
- prevent liquid slugs at the compressor
- provide space for the accumulation of oil and containminants
24: The formula for Pure Power in a resistance circuit is
- Watts X amps.
- Watts = volts X amps
- Kw = volts X amps
- Watts X power factor
25: Whoever owns/uses a refrigeration or air conditioning system covered by this code
- must notify the Department of Public Safety prior to starting the system
- shall be licensed by the Commonwealth of Massachusetts according to CMR 522
- shall make application for inspections to the Chief of Inspectors
- None of the above