Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Megaohm meters can detect a ground in the

  • 10,000,000 ohms or higher
  • up to 10,000 ohms
  • up to 1,000,000 ohms
  • up to 1,000 ohms

2: A room having machinery but no flame producing apparatus permanently installed and operated is considered a

  • Class M machinery room
  • Class T machinery room
  • Class A machinery room
  • Class B machinery room

3: A tachometer is an instrument used to measure

  • RPM
  • speed
  • static pressure
  • air velocity

4: Adjusting the spring pressure on a TXV

  • changes superheat
  • makes no difference
  • adjusts the bulb charge
  • changes subcooling

5: Start to Run windings will have what resistance?

  • Somewhere between the actual start winding and run winding resistance value
  • The least resistance value
  • The most resistance value
  • All will be at equal values

6: R-22 falls under which safety classification?

  • B-2
  • A-2
  • B-1
  • A-1

7: A moisture indicator must

  • be yellow
  • be sight side up
  • change color when exposed to moisture
  • be filled with liquid

8: A declaration test is needed when the system contains more than

  • 55 lbs
  • 110 lbs
  • 65 lbs
  • 120 lbs

9: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?

  • 27 ohms
  • 80 ohms
  • 104 ohms
  • 71 ohms

10: Evaporators within 18" of a heating coil must be equipped with a

  • pressure relief device
  • zone valve
  • low limit control
  • high limit control

11: What's the purpose of a megohmmeter?

  • To measure low to very low resistance values
  • To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
  • To measure very high resistances
  • None of the above

12: All electrical work done on refrigeration systems must comply with

  • OSHA
  • ASHREA-15 Section 9.2.1
  • NEC and Massachusetts Modifications
  • Department of Energy

13: The certificate of inspection

  • shall be $20 and an additional fee of $1 for each tone above 20 tons
  • shall be posted and protected from dirt, water, and other elements
  • shall be posted on the compressor shell or electrical panel at the unit
  • shall be authorized by a notarized insurance company

14: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere

  • 110
  • 1,000
  • 330
  • 6.6

15: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant

  • shall be inspected by the Boiler of Inspectors bi-annually
  • does not require a pressure-limiting device
  • shall have a pressure limiting device installed on the high side of the system
  • shall have a pressure limiting device and a pressure relief valve installed

16: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.

  • shall be prohibited
  • of Group B2 refrigerant shall be prohibited
  • containing R-11, R-123 & R-717 exclusively shall not be prohibited
  • shall not be prohibited

17: What section governs pressure vessels?

  • Section 1 ASHREA 15 ASME fired
  • OSHA
  • Section 8 ASHREA 15 ASME unfired
  • Section ASHREA 34

18: Where is an EPR valve located on a multi-evaporator system?

  • Suction line prior to the accumulator of the lowest temperature system
  • Suction line at the compressor
  • Suction line of the warmest evaporator
  • Suction line of the coolest evaporator

19: A motor starter is a device that includes an overload and a _______?

  • contactor
  • 2-pole contacts
  • duel-coil
  • all of the above

20: How much refrigerant can be stored in a mechanical room outside of the system?

  • 150
  • 100
  • 330
  • 200

21: What type of relief valve is used on low pressure centrifugal compressor systems?

  • Spring-loaded relief valve
  • Rupture disc
  • Purge relief
  • None of the above

22: Setting a pressure relief device shall not exceed ___ of the design pressure

  • 100%
  • 75%
  • 90%
  • 80%

23: A motor starter contains a thermal overload and a

  • contactor
  • transformer
  • solenoid
  • 3-way relay

24: What kind of material can't be used on the outlet of a relief valve?

  • Copper
  • Stainless Steel
  • Aluminum
  • PVC

25: Where a refrigeration or air conditioning system is installed,

  • The company who installed the system must notify the fire department in the jurisdiction where installed
  • A field inspection shall be made before it is put into service
  • the form or certificate shall be authorized by the Department of Public Safety
  • it shall not be operated below prescribed pressuers