Topics: All categories in the pool
1: When an A/C system is excessively low on refrigerant
- it can become contaminated with water
- there can be nuisance trip outs
- the suction line may be too hot to touch
- All of the above
2: What are the three components of a transformer?
- Primary core, secondary coil, and high and low voltage connectors.
- Contacts, secondary coil, and core
- Primary coil, secondary coil, and core
- Primary coil, secondary coil, and copper contacts
3: Viscosity is
- the coefficient of external friction
- a measure of heat content
- the ability of oil to flow
- measure of weight
4: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use pressure relief devices or fusible plugs
- shall use fusible plugs
- shall use pressure relief devices
- do not need pressure relief protection
5: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
6: Class T machine room
- shall have remote controls to stop the action of the refrigerant compressor
- shall have refrigerant leak detecting systems installed inside and outside the room
- has no flame producing apparatus permanently installed
- shall include closets used for setting equipment
7: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?
- 277v
- 240v
- 120v
- 208v
8: What is the maximum voltage range allowed on an electrical circuit?
- 5%
- 15%
- 10%
- 20%
9: The best way to detect ammonia in brine is
- CO2 gas
- carbonation of soda
- potassium of line
- nessler regaent
10: What would be the classification for Stop & Shop grocery store?
- Industrial
- Large mercantile
- Instituional
- Place of assembly
11: Which of the following is not an air velocity meter?
- Anemotherm
- Velometer
- Hydrometer
- Anemometer
12: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.
- 50
- 55
- 15
- 75
13: Watt's Law indicates Volts X Amps = _________.
- Ohms
- Resistance
- Watts
- Current
14: If the power element of an expansion valve should lose its charge the valve would
- overfeed the evaporator
- underfeed the evaporator
- go closed
- go open
15: How many BTU's is produced by one watt of energy
- 2.57
- 3.00
- 3.41
- 1
16: Can you use Ammonia in industrial applications?
- When mixed with R-718
- Yes, Under certain condidtions
- Yes, always
- No, never
17: How does a centrifugal compressor create the pressure differential needed to move refrigerant through the system?
- Fan-like action
- Suction and discharge valves
- Nesting scrolls
- Rotating vanes
18: What type refrigerant is NOT ozone depleting?
- HFC
- HCFC
- CFC
- Halon
19: Halogenated refrigerants cannot be used with what material?
- Copper
- Magnesium alloy
- Stainless steel
- Aluminum
20: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When its white
- When there is a space 6' or more above it
- When there are sprinklers above
- When it's used as part of a supply or return air system
21: A tachometer is an instrument used to measure
- RPM
- static pressure
- speed
- air velocity
22: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are
- gate or globe valves
- king valves
- ball valves
- companion or block valves
23: A motor starter contains a thermal overload and a
- solenoid
- contactor
- 3-way relay
- transformer
24: E = I X R is
- Ohms Law
- Amps Law
- Impedance Law
- Watts Law
25: What type of relief valve is used on a CO2 system?
- fusible plug
- glove disc
- rupture disc
- gate valve