Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: If your suction line is warmer than the room temperature, this may indicate

  • a low charge
  • an over charge
  • plugged air filter
  • below normal superheat

2: The color code of a tank of ammonia is

  • lavender
  • light green
  • silver
  • white

3: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.

  • True
  • False

4: Which winding have the most turns?

  • depends on the motor phase
  • they have equal amount of turns
  • Start
  • run

5: A mixed occupancy occurs when two or more occupancies are located with the same building

  • true
  • false

6: A class A3 refrigerant is considered

  • toxic and somewhat flammable
  • non-toxic and non-flammable
  • non-toxic but highly flammable
  • toxic and non-flammable

7: Which of the following is an example of an azeotropic refrigerant?

  • R-134A
  • R-404A
  • R-410A
  • R-500

8: Stop valves shall not be permitted between the system and the

  • condenser
  • bleed valve
  • relief valve
  • service valve

9: The solution that leaves the concentrator in an absorption chiller is referred to as the

  • strong solution
  • absorbed solution
  • diluted solution
  • weak solution

10: Name a reason that does not cause reduced condenser air quantity

  • Dirty fan blades
  • High ambient temperature
  • Prevailing winds
  • Dirty Coil

11: A relief valve shall be located at least ___ above grade.

  • 10'
  • 15'
  • 25'
  • 36'

12: Ammonia belongs to Group

  • B-1
  • A-2
  • B-2
  • A-1

13: Oils, classified as to source, are

  • naphthalene, mixed, and paraffin
  • animal, vegetable, and castor
  • animal, vegetable, and mineral
  • naphthalene, paraffin, and castor

14: What is an example of institutional occupancy?

  • Shopping mall
  • Dorms
  • Football stadium
  • Hospital

15: What are the three components of a transformer?

  • Primary coil, secondary coil, and copper contacts
  • Primary coil, secondary coil, and core
  • Primary core, secondary coil, and high and low voltage connectors.
  • Contacts, secondary coil, and core

16: A secondary coolant is defined as

  • any refrigerant direcly in contact with the cooling space for process cooling
  • a combination of interconnected parts from a closed circuit in where fluid is circulated for the purpose of cooling for a refrigeration system.
  • 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

17: What must be done to all doors and access points in duct work going through a mechanical room?

  • Must be hindged
  • Must be screwed shut
  • Must be sealed and gasketed
  • All of the above

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

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

19: In designing duct work, pressure and ______ need to be considered

  • length
  • CFM
  • duct sealant used
  • all of the above

20: Refrigeration piping before being buried shall be

  • leak tested
  • encased in pipe duct
  • pressure tested
  • All of the above

21: A High-Probability System

  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is a system highly likely to leak form a failed connection or component of such system
  • is such that a leak of refrigerant from a failed connection will enter the occupied space
  • is such that a leak of refrigerant from a failed connection will enter an unoccupied space

22: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.

  • 24
  • 75
  • 50
  • 100

23: What is a megaohm meter?

  • An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
  • Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.
  • An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested
  • An electric meter used by electricians to test large 3-phase blower motors for the correct rotation

24: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?

  • 10 amps
  • 20 amps
  • 5 amps
  • 15 amps

25: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)

  • 70F
  • 77F
  • 32F
  • 58F