Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

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

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

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

3: Which occupancy can ammonia be used in?

  • industrial
  • redifential
  • depends on the quantity of freon
  • commercial

4: Pressure vessels nameplate markings must be compliant with the

  • ASHRAE 34 Standards
  • CMR-588 & CMR-528
  • ASME Boiler and Pressure Vessel Code
  • All of the Above

5: Transformers are rated in

  • volts
  • volts-ohms
  • amps
  • volt-amps

6: Crankcase heaters are energized

  • while the compressor is running
  • to prevent compressor freeze-up
  • when the compressor is off
  • to allow easy compressor start-up

7: Pressure vessels of 10 cubic feet or more gross volume shall use

  • at least one rupture member
  • a dual pressure-relief valve if charging into the atmosphere
  • at least three means of discharge and/or rupture discs
  • both a and b are correct

8: The normal operating evaporator temperature of R-410A for air conditioning is typically

  • 45F
  • 158F
  • 32F
  • 155F

9: What is the voltage of each leg of a 480 Volt three-phase motor?

  • 277v
  • 120v
  • 208v
  • 240v

10: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to

  • liquid line that is too small
  • shortage of refrigerant
  • liquid line that had too high vertical lift
  • All of the above

11: Name an HCFC refrigerant(s):

  • R-22
  • R-123
  • R-11
  • both a & b

12: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • UL and UM
  • UM or UL
  • UV or UR
  • UL and UR

13: Capacitors are rated in

  • kelvins
  • megaohms
  • micro-farads
  • volt - amperes

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

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

15: The proper location for an oil separator is between the

  • condenser and receiver
  • receiver and metering device
  • compressor and condenser
  • evaporator and compressor

16: What type of relief valve is used on a CO2 system?

  • fusible plug
  • glove disc
  • gate valve
  • rupture disc

17: Sublimation occurs when

  • ice melts and turns to water
  • gas is formed directly from a solid
  • liquid is formed from a gas
  • gas is formed from a liquid

18: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.

  • high pressure
  • critical pressure
  • low pressure
  • design pressure

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

  • A-1
  • A-2
  • B-1
  • B-2

20: A High-Probablity system

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

21: What section governs pressure vessels?

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

22: When an electronic bridge is in balance the bridge output will be

  • 1 volt
  • 15 volts
  • .01 volts
  • 0 volts

23: What is the temperature that a liquid and a vapor can exist in equilibrium called?

  • Saturated temperature
  • Dry bulb temperature
  • Wet bulb temperature
  • Critical temperature

24: Total heat of a substance is considered

  • empathetical
  • enthalpy
  • specific heat
  • sensible heat

25: How far from the window does a relief valve need to be according to ASHRAE-15?

  • At least 20'
  • There is no minimum for relief valve and windows.
  • At least 40'
  • At least 30'