Topics: All categories in the pool
1: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
2: An electronic bridge circuit is basically a
- high voltage circuit
- Wheatstone
- 24 volt control circuit
- suspension
3: The main cause of enacting the "no vending rule" of July 1st 1992 was
- global warming potential
- ozone depletion
- both a & b
- None of the above
4: Horizontal piping should be run level.
- False
- Yes, if the condenser is located above the evaporator
- No, unless the supervisor on the job says so.
- True
5: A hotel is considered a _______ occupancy.
- institutional
- commercial
- residential
- mercantile
6: The two basic types of evaporators are
- finned and plate
- direct expansion and plate
- flooded and direct expansion
- prime surface and finned
7: How many gallons of water do you need per pound of ammonia?
- 50
- 100
- 10
- 1
8: The low pressure oil safety switch
- resets itself after the time delay has terminated
- resets itself automatically
- must be reset manually
- never trips
9: E = I X R is
- Watts Law
- Amps Law
- Impedance Law
- Ohms Law
10: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is
- drawing RLA and is running as it should
- drawing LRA and is seized and should be replaced.
- running hot
- none of the above
11: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
- When it's cold out
- When there is a malfunction on the high side
- When its warm out
- All of the above
12: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 25
- 15
- III
- 10
13: Single compound Refrigerants are classified by what two criteria?
- Flammability and temperature range
- Weight and color
- Temperature range and hazardousness
- Flammability and toxicity
14: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.
- 400
- 100
- 350
- 250
15: Excessive head pressure is often caused by
- leaking reed valve on the discharge side
- insufficient refrigerant
- air cooled condenser is plugged
- thermostat set too high
16: At higher altitudes, boiling temperatures
- are unaffected
- depends on the refrigerant
- decrease
- increase
17: The freezing point of water at sea level is?
- -10C
- 32F
- 32C
- 0F
18: The Department that certifies the transportation of refrigerant is the
- EPA
- EPO
- DOT
- RSES
19: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is
- 21F
- 9F
- 29F
- 11F
20: How many different groups of refrigerants are there?
- 3
- 11
- 7
- 15
21: The location of a thermal bulb of a TXV affects
- subcooling
- the amount of liquid returning to the compressor
- the amount of liquid refrigerant in the evaporator
- the amount of liquid in the condenser.
22: Which occupancy can ammonia be used in?
- redifential
- depends on the quantity of freon
- industrial
- commercial
23: Where must a refrigeration contractor's license number be displayed?
- Trucks, invoices, and advertising
- Uniforms, checks, and invoices.
- Trucks, license plates, and uniforms
- Truck, office, every job, and on all equipment
24: Halogenated refrigerants cannot be used with what material?
- Copper
- Aluminum
- Stainless steel
- Magnesium alloy
25: Low-side system leaks in a low-pressure chiller will often result in
- water being pulled into the system
- air being pulled into the system
- nitrogen leaking out of the system.
- system refrigerant leaking from the system