Topics: All categories in the pool
1: All electrical work done on refrigeration systems must comply with
- Department of Energy
- NEC and Massachusetts Modifications
- ASHREA-15 Section 9.2.1
- OSHA
2: Pipe identification labels are required when the system contains more than
- 55 lbs
- 110 lbs
- 120 lbs
- 65 lbs
3: If a halide torch is used for leak detection, what color is the flame if it detects a leak?
- blue
- orange
- red
- green
4: Volts x amps equals
- Inductance
- Impedance
- Ohms Law
- Watts
5: Low-side system leaks in a low-pressure chiller will often result in
- system refrigerant leaking from the system
- nitrogen leaking out of the system.
- water being pulled into the system
- air being pulled into the system
6: The heat picked up in the evaporator must equal to
- the heat of compression
- the heat gained by the condenser
- the heat lost by the medium being cooled
- the heat giving by the condenser
7: Fusible plugs shall not be used with pressure vessels of
- 15 square feet or less
- 3 cubic feet or more
- 3 cubic feet or less
- 15 cubic feet or more
8: In an electrical circuit, what is potential measured in?
- Volts
- Ohms
- Herys
- Amps
9: R-410A is classified as a ____ refrigerant on the safety matrix.
- B-2
- A-2
- B-1
- A-1
10: Halogen refrigerants are corrosive to which type of metal?
- copper
- magnesium
- black iron
- stainless steel
11: If the power element of an expansion valve should lose its charge the valve would
- go open
- go closed
- underfeed the evaporator
- overfeed the evaporator
12: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use rupture discs or duel pressure relief valves
- shall use pressure relief devices or fusible plugs
- shall use fusible plugs
- shall use pressure relief devices
13: A halide torch is most useful with a freon compression system
- to release a sticking valve
- to sweat flanges on the refrigeration piping
- to detect refrigeration leaks in piping joints
- to remove from from TXV's and evaporator coils
14: Which of the following is NOT a positive displacement compressor?
- reciprocating
- scroll
- centrifugal
- screw
15: The discharge relief valve is located (9.4.6)
- between the compressor and oil separator
- between the compressor and reciever
- between the compressor and the stop valve
- on top of the condensor
16: The amount of heat required to raise the temperature of 1 lb of water 1F is?
- 1 Kelvin
- 1 BTU
- The rate of conduction
- 1 Therm
17: Machinery rooms must be vented to ______?
- outdoors
- neutralizing tank
- basement
- unoccupied spaces
18: The start winding has _____ turns than the run winding.
- more
- less
- the same
- none of the above
19: A 3-cubic foot receiver must have what type of relief valve?
- fusible plug
- relief valve
- rupture device
- none of the above
20: In a horizontal shell & tube condenser, the ammonia is liquefied by
- removing the latent heat of vaporization
- passing thru the tubes from top to bottom
- water sprayed over condenser
- removing the latent heat of fusion
21: Direct systems using Group II refrigerants
- shall be allowed to be used for human comfort.
- shall not be used for air condition for human comfort
- shall be installed per instruction of the AHJ
- shall be installed in Class T machinery rooms
22: How does a centrifugal compressor create the pressure differential needed to move refrigerant through the system?
- Nesting scrolls
- Fan-like action
- Rotating vanes
- Suction and discharge valves
23: How far from the window does a relief valve need to be according to ASHRAE-15?
- There is no minimum for relief valve and windows.
- At least 30'
- At least 20'
- At least 40'
24: When must refrigeration system covered by the code be inspected?
- Upon installation
- Annually
- Annually and when installed
- Not required
25: A start capacitor in series with a start winding will
- increase the amp draw of the motor
- increase running efficiency
- increase starting torque
- decrease the amp draw of the motor