Topics: All categories in the pool
1: On a single phase motor, when does the start winding cut out?
- 50% of its RLA speed
- 100% of its RLA speed
- 25% of its RLA speed
- 75% of its RLA speed
2: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by
- District Engineering Inspectors
- Commissioned Inspectors
- Master licensed Technician
- both a or b
3: Which has more turns in the windings: Start windings or Run windings?
- Start windings
- Run windings
- They both have the exact same turns
- Depends on the system and capacitor used
4: What are the three components of a transformer?
- Contacts, secondary coil, and core
- Primary core, secondary coil, and high and low voltage connectors.
- Primary coil, secondary coil, and core
- Primary coil, secondary coil, and copper contacts
5: The measurement of heat in a particular substance is
- sensible heat
- specific heat
- enthalpy
- latent heat
6: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
7: Which winding have the most turns?
- run
- Start
- depends on the motor phase
- they have equal amount of turns
8: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- rupture plug
- relief plug
- fusible plug
- fusion plug
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: The first step in mechanical refrigeration is
- expansion
- compression
- evaporation
- condensation
11: Heat is a form of
- work
- energy
- power
- matter
12: Which of the following is an inorganic refrigerant?
- R-22
- Ammonia
- Chlorofluorocarbons
- All of the above
13: What pipe can not be used for refrigeration?
- L
- K
- N
- M
14: The most common type of motor starter is
- part winding starter
- duel-winding starter
- across the line starter
- delts-wye starter
15: A 3-cubic foot receiver must have what type of relief valve?
- fusible plug
- relief valve
- rupture device
- none of the above
16: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- the high side
- the aggregate of the high side and low side
- 2.5 times the design pressure
- the low side
17: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Leak checked
- Insulated and installed in a pipe duct (Encased)
- Certified
- Classifed
18: Suction line oil traps should be installed when the condenser is
- more than 100' away from the evaporator
- in the basement and the evaporator is on the third floor
- on the third floor roof and the evaporator is in the basement
- located outside the operates in temperatures below 35F
19: Electricity involves the movement of electrons in atoms
- True
- False
20: Who approves containers for refrigerants?
- D.O.T
- D.O.E
- E.P.A
- D.O.D
21: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
22: R-410A is classified as a ____ refrigerant on the safety matrix.
- B-1
- B-2
- A-2
- A-1
23: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- does not require a pressure-limiting device
- shall be inspected by the Boiler of Inspectors bi-annually
- shall have a pressure limiting device and a pressure relief valve installed
- shall have a pressure limiting device installed on the high side of the system
24: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When there is a space 6' or more above it
- When there are sprinklers above
- When its white
- When it's used as part of a supply or return air system
25: 14.7 psia is equivalent to
- atmospheric pressure at seal level
- 29.92" Hg
- 0 psig
- All of the above.