Topics: All categories in the pool
1: Ohm's Law indicates Amps X Resistance = ___________.
- Current
- Impedance
- Volts
- Ohms
2: A secondary coolant is defined as
- any liquid used for the transmission of heat without a change of state in A/C refrigeration systems having flash point above 150F
- a low temperature refrigerant used for cascading systems
- a combination of interconnected parts from a closed circuit in where fluid is circulated for the purpose of cooling for a refrigeration system.
- any refrigerant direcly in contact with the cooling space for process cooling
3: What is the amp draw of a 40 VA transformer at 24 volts
- 1.6 amps
- 1,000 amps
- 106 amps
- 1K amps
4: When must refrigeration system covered by the code be inspected?
- Not required
- Annually
- Annually and when installed
- Upon installation
5: A thermometer inside a duct measures ____ heat.
- hidden
- sensible
- latent
- specific
6: How far from the window does a relief valve need to be according to ASHRAE-15?
- At least 30'
- There is no minimum for relief valve and windows.
- At least 20'
- At least 40'
7: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?
- 277v
- 240v
- 208v
- 120v
8: Transformers are rated in
- volts-ohms
- amps
- volts
- volt-amps
9: When a refrigerating machinery room is used, the emergency procedures shall be posted
- on a conspicuous card located near the evaporator
- outside the room, immediately adjacent to each door
- on a conspicuous card located near the compressor
- inside the room, immediately adjacent to each door
10: What is NOT a positive displacement compressor.
- Centrifugal
- Rotary
- Scroll
- Reciprocating
11: High pressure controls should be set no higher than
- 25% of set point
- 80% of set point
- 10% of set point
- 90% of set point
12: In a horizontal shell & tube condenser, the ammonia is liquefied by
- removing the latent heat of vaporization
- water sprayed over condenser
- removing the latent heat of fusion
- passing thru the tubes from top to bottom
13: The measurement of heat in a particular substance is
- sensible heat
- specific heat
- latent heat
- enthalpy
14: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.
- Lithium bromide
- HCFC-123
- CFC-11
- ammonia
15: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- “UV”
- “UL”
- “U” or “UM”
- “UM” and “UV”
16: No open flames are allowed in the machinery room unless?
- Approved by the installing contractor
- Approved by the authorized person
- Never can be allowed
- Only when combustion air is provided from outside of the machinery room
17: Define occupied space?
- Residential Occupancy
- The portion of the premises accessible to or occupied by people excluding machinery rooms
- The portion of the premises accessible to or occupied by people including machinery rooms
- Both a & b
18: Usually dry bulb temperature is
- same as wet bulb temperature
- higher than wet bulb temperature
- lower than dry bulb temperature
- not important and shall be ignored
19: Heat transferred by conduction from one body to another is done via:
- gas
- liquid
- solid
- All of the above
20: If two 500 ohm resistors are connected in series, the resistance will be
- 1000 ohms
- 20 ohms
- 500 ohms
- 200 ohms
21: What would be the classification for Stop & Shop grocery store?
- Industrial
- Instituional
- Large mercantile
- Place of assembly
22: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Zinc
- Copper
- Nickel
- Magnesium
23: In an electrical circuit, what is potential measured in?
- Volts
- Amps
- Herys
- Ohms
24: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use rupture discs or duel pressure relief valves
- shall use fusible plugs
- shall use pressure relief devices
- shall use pressure relief devices or fusible plugs
25: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above