Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What pipe can not be used for refrigeration?

  • L
  • K
  • N
  • M

2: What refrigerant is an inorganic compound?

  • R-410A
  • R-22
  • Ammonia
  • R-132A

3: Capacity control on an absorption system is typically accomplished by varying the

  • pressure setting on the system's rupture disc
  • speed of the chilled water circulatory pump
  • speed of the condenser water circulator pump
  • rate at which heat is supplied to the generator

4: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?

  • Heat
  • Air
  • Electricity
  • Oil

5: Usually dry bulb temperature is

  • lower than dry bulb temperature
  • not important and shall be ignored
  • higher than wet bulb temperature
  • same as wet bulb temperature

6: What is not a requirement of a class T machine room?

  • self-closing doors
  • fire hose connection to the building fire protection system
  • tight fitting doors
  • automatic ventilation

7: Class 3 refrigerants are

  • highly flammable
  • toxic
  • non-flammable
  • non-toxic

8: 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

9: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants

  • higher
  • there is no Group B1 refrigerants
  • lower
  • the same

10: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.

  • 36
  • 24
  • 48
  • 18

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

  • 150
  • 200
  • 330
  • 100

12: If two 500 ohm resistors are connected in series, the resistance will be

  • 200 ohms
  • 500 ohms
  • 20 ohms
  • 1000 ohms

13: _____ and its alloys are suitable for use with ammonia systems.

  • Magnesium
  • Copper
  • Zinc
  • Aluminum

14: Pipe identification labels are required when the system contains more than

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

15: Which creates more of a heat load?

  • 70% RH
  • 30% RH
  • 50% RH
  • 90% RH

16: High side floats are used on centrifugal chiller systems are are considered critically charged systems.

  • are obsolete.
  • True
  • False
  • depends on the type of refrigerant being used

17: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.

  • 1
  • 5
  • 3
  • 2

18: The absorber shell contains the

  • evaporator and the absorber
  • condenser and the absorber
  • condenser and the generator
  • condenser, the evaporator, and the generator

19: The External equalizer of a TXV compensates for

  • pressure within the system
  • pressure drop across the condenser coil
  • pressure drop across the evaporator coil
  • pressure within the evaporator

20: Brazed joints melt at temperatures above

  • 1,200F
  • 500F
  • 800F
  • 1,000F

21: Oils, classified as to source, are

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

22: R-22 is classified as a ____ refrigerant on the safety matrix.

  • A-2
  • A-1
  • B-2
  • B-1

23: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.

  • color-coded glass to determine type of refrigerant
  • moisture indicators
  • automatic closing shut-off valves
  • All of the above

24: 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

25: Halogen refrigerants are corrosive to which type of metal?

  • copper
  • stainless steel
  • black iron
  • magnesium