Topics: All categories in the pool
1: A 24 volt transformer with a 240 volt primary can handle how many amps?
- There isn't enough information to answer.
- 24 amps
- 10 amps
- 20 amps
2: All electrical work done on refrigeration systems must comply with
- NEC and Massachusetts Modifications
- ASHREA-15 Section 9.2.1
- Department of Energy
- OSHA
3: How many gallons of water per pound of ammonia do you need?
- 1
- 15
- 5
- 20
4: A check valve is a device
- designed to allow the flow of refrigerant gas in both directions
- that is always spring loaded
- with a pressure drop
- found on high pressure steam systems
5: What is a Category "D" fluid?
- Any fluid that exceeds 150 psig and has design temperature of over 366F
- A typical refrigerant used on newer air conditioning and heat pump ssytems
- 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 toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
6: Two capacitors are wired in parallel. One capacitor has a value of 15uf. The other has a value of 25uf. What is the total value supplied?
- 40 uf
- 25 uf
- 20 uf
- 15 uf
7: If a low-pressure chiller has a low-side leak, which of the following will most likely result?
- High head pressure and low suction pressure
- Low suction pressure and low discharge pressure
- Low head pressure and high suction pressure
- High suction pressure and high discharge pressure.
8: Adjusting the spring pressure on a TXV
- changes superheat
- changes subcooling
- makes no difference
- adjusts the bulb charge
9: What is Absolute Zero?
- -460F
- -400F
- -640F
- -773F
10: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.
- 100
- 90
- 110
- 80
11: When a refrigerating machinery room is used, the emergency procedures shall be posted
- on a conspicuous card located near the compressor
- on a conspicuous card located near the evaporator
- inside the room, immediately adjacent to each door
- outside the room, immediately adjacent to each door
12: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- regularly
- quarterly
- annually
- bi-annually
13: How many opening forces operate a thermostatic expansion valve?
- 2
- 4
- 3
- 1
14: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 2
- 1
- 5
- 3
15: If a halide torch is used for leak detection, what color is the flame if it detects a leak?
- green
- red
- orange
- blue
16: The measurement of heat in a particular substance is
- enthalpy
- specific heat
- latent heat
- sensible heat
17: A split-phase motor has a ______ winding and a ____ winding
- run, common
- start, common
- run, start
- duel-run, duel-start
18: If the power element on an expansion valve should lose its charge, the valve would
- Under feed
- Stay open
- Over feed
- Close
19: The discharge relief valve is located (9.4.6)
- on top of the condensor
- between the compressor and reciever
- between the compressor and oil separator
- between the compressor and the stop valve
20: A secondary coolant is defined as
- any refrigerant direcly in contact with the cooling space for process cooling
- any liquid used for the transmission of heat without a change of state in A/C refrigeration systems having flash point above 150F
- a combination of interconnected parts from a closed circuit in where fluid is circulated for the purpose of cooling for a refrigeration system.
- a low temperature refrigerant used for cascading systems
21: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 33
- 50
- 18
- 22
22: An air conditioning system rated for 36,000 BTU's is equivalent to
- one ton of cooling
- 12,000 tons of cooling
- two tons of cooling
- three tons of cooling
23: Evaporators within 18" of a heating coil must be equipped with a
- low limit control
- zone valve
- pressure relief device
- high limit control
24: What type of material can't be used on the outlet of a relief valve?
- Magnesium alloy
- PVC
- Stainless steel
- Copper
25: 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