Topics: All categories in the pool
1: What is potential measured in?
- Volts
- Amps
- Ohms
- Henrys
2: A class A3 refrigerant is considered
- non-toxic but highly flammable
- non-toxic and non-flammable
- toxic and somewhat flammable
- toxic and non-flammable
3: There can be no airflow from an occupied space through a machine room unless what?
- System is high velocity
- System is ducted and sealed
- Duct is not located in the ceiling
- None of the above.
4: The heat picked up in the evaporator must equal to
- the heat gained by the condenser
- the heat giving by the condenser
- the heat of compression
- the heat lost by the medium being cooled
5: "I" represents ____ in the Ohm's law formula.
- resistance
- amperage
- capacitance
- voltage.
6: On a 460V motor, what is he MAXIMUM voltage that can be safely applied to it?
- 506v
- 550v
- 660v
- None of the above
7: Booster compressors connect to the ____ side of the compressor
- vapor
- low side
- liquid
- oil side
8: Joints in refrigeration piping must be _____ before being covered?
- Pressurized
- Inspected
- Leak tested
- Insulated
9: Usually dry bulb temperature is
- not important and shall be ignored
- higher than wet bulb temperature
- same as wet bulb temperature
- lower than dry bulb temperature
10: When a refrigeration or air conditioning system is installed
- a field inspection shall be made before it is put into service
- it shall not be operated below prescribed pressures
- the form of certificate shall be authorized by the Department of Pubic safety
- it shall be approved by the owner for proper operation.
11: Systems containing more than 110 pounds must have stop valves located at the
- compressor suction inlet
- compressor discharge outlet
- receiver inlet and outlet
- All of the above
12: Liquid line filter-driers on a 410A system must be rated for no less than
- 400 psig
- 1000 psig
- 200 psig
- 600 psig
13: 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
14: A motor starter is a device that includes an overload and a _______?
- contactor
- 2-pole contacts
- duel-coil
- all of the above
15: Absolute pressure is
- Gauge Pressure
- Atmospheric Pressure
- Gauge + Atmospheric Pressure + Pi
- none of the above
16: A chiller entering and leaving temperature difference is?
- 50 degrees F
- 10 degrees F
- 5 degrees F
- 20 degrees F
17: In a motor, an internal overload might open if
- there's an open start winding
- there's an excess current draw through the motor
- there was a high pressure refrigerant was used for a low pressure system.
- there's a direct short
18: A multi-evaporator refrigeration system uses what type of valve to maintain evaporating temperatures?
- Solenoid valve
- EPR valve
- CPR valve
- EEV
19: The Board of Boilers adopts by reference
- the MACS Pressure Vessel Code of Massachusetts
- the 1997 ANSI/ASHRAE Safety Code
- Montreal Protocol Safety Code
- MSCA Code
20: What is NOT a positive displacement compressor.
- Centrifugal
- Scroll
- Reciprocating
- Rotary
21: High pressure controls should be set no higher than
- 80% of set point
- 10% of set point
- 25% of set point
- 90% of set point
22: RPM's of a centrifugal compressor are at approximately?
- 500
- 10,000
- 15,000
- 30,000
23: Give an example of a secondary coolant?
- R-717
- R-718
- R-12
- R-410A
24: What is the amp draw of a 40 VA transformer at 24 volts
- 106 amps
- 1K amps
- 1,000 amps
- 1.6 amps
25: R-12 is
- dichlorodifluoromethane
- dichlorofluoromethane
- dichloromethane
- trichlorofluoromethane