Topics: All categories in the pool
1: How would you know if there was a loss of crankcase pressure?
- oil will foam
- oil level will rise
- oil will thin out
- oil will thicken
2: What kind of material can't be used on the outlet of a relief valve?
- Stainless Steel
- PVC
- Copper
- Aluminum
3: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.
- 350
- 100
- 250
- 400
4: Refrigerant restricted in 2004 but used for transition for decades:
- R-123
- R-11
- R-22
- R-134A
5: 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
6: The purpose of an accumulator is to
- reduce friction loss to the flow of refrigerant
- filter out impurities from the system
- store excess refrigerant from the reciver
- assure no liquid returns to the compressor
7: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
- 9.00'
- 7.00'
- 7.25'
- 8'4"
8: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
9: A start capacitor in series with a start winding will
- increase the amp draw of the motor
- decrease the amp draw of the motor
- increase running efficiency
- increase starting torque
10: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- III
- 15
- 10
- 25
11: A thermometer inside a duct measures ____ heat.
- hidden
- sensible
- latent
- specific
12: If the power element on an expansion valve should lose its charge, the valve would
- Over feed
- Under feed
- Close
- Stay open
13: What is the minimum size of the discharge pipe?
- Same size as the outlet of the relief valve
- One pipe size larger that the inlet of the relief valve
- Depends on size of manifold
- All of the above
14: What is used to check very low pressure?
- Hygrometer
- Manometer
- Velometer
- Hydrometer
15: A capacitor in series with the start windings will do what?
- Increase starting torque
- Decrease the RLA to within 10% of its rating
- Increase run efficiency by 10% of its rating
- Nothing
16: The evaporator is a device to
- store liquid refrigerant
- absorb heat into the refrigeration system
- Keep the compressor busy
- remove heat from the refrigeration system
17: All welding done on any refrigeration system or piping covered by 522 CMR 9.00 shall be performed by a according to Section IX of the ASME code
- licensed technician
- welder qualified
- licensed welder
- competent welder
18: What is the purpose of a surge capacitor on a contactor?
- to keep the contactor pulled in
- to balance the sine waves
- to provide smoother start/stops
- to protect low voltage equipment
19: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
20: Which refrigerant is lighter than air?
- R-717
- R-11
- R-123
- R-134a
21: A class A3 refrigerant is considered
- non-toxic and non-flammable
- toxic and non-flammable
- non-toxic but highly flammable
- toxic and somewhat flammable
22: Joints in refrigeration piping must be _____ before being covered?
- Leak tested
- Insulated
- Inspected
- Pressurized
23: How are refrigerant blends classified?
- Based on the oil used
- Based on best case Fractionation
- Based on worst case fractionation
- Blends don't have to be classified
24: 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
- 240 volts
- 24.0 volts
- 2.40 volts
25: What is not a requirement of a class T machine room?
- self-closing doors
- fire hose connection to the building fire protection system
- tight fitting doors
- automatic ventilation