Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: 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

2: A R-410A system running with a condensing temperature of 110F and 50F evaporator temperature will read pressures of ___ on the high side and ___ on the low side

  • 455 psig, 185 psig.
  • 226 psig, 68 psig
  • 365 psig, 120 psig
  • 257 psig, 77 psig

3: A professional or office building would be considered what type of occupancy?

  • mercantile
  • public assembly
  • commercial
  • business

4: On a single phase motor, when does the start winding cut out?

  • At 75% of its full rated speed
  • At 25% of its full rated speed
  • At 50% of its full rated speed
  • Start windings do no cut-out of the run cycle

5: What is a megaohm meter?

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

6: Brazed joints melt at temperatures above

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

7: Cooling tower lowers condenser water temp by

  • running water thru a secondary heat exchanger
  • condensation
  • running fans at 100%
  • evaporative cooling

8: The discharge relief valve is located (9.4.6)

  • between the compressor and the stop valve
  • on top of the condensor
  • between the compressor and oil separator
  • between the compressor and reciever

9: Ammonia belongs to Group

  • A-2
  • B-1
  • A-1
  • B-2

10: Machinery rooms must be vented to ______?

  • basement
  • outdoors
  • unoccupied spaces
  • neutralizing tank

11: A High-Probability 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 a failed connection will enter an unoccupied space
  • is such that a leak of refrigerant from a failed connection will enter the occupied space
  • is a system highly likely to leak form a failed connection or component of such system

12: 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

13: Ammonia can come in contact with _______ ?

  • Aluminum
  • Brass
  • Copper
  • Copper tubing

14: A mercury bulb controller is not recommended for

  • use where vibration is severe
  • low voltage use
  • line or low voltage use
  • line voltage use

15: A positive displacement compressor is

  • a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
  • where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
  • is a reciprocating type compressor with 2 or more pistons
  • a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber

16: Which is the lowest vacuum?

  • 5 psig
  • 10 psia
  • 5" hg
  • 1,000 Microns

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

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

18: To determine the pump size needed for an open cooling tower system, the following must be known,

  • GPM and balanced head and friction head
  • GPM and unbalanced head and friction head
  • GPM and friction head
  • GPM, pipe size, and equivalent head.

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

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

20: What is used to check very low pressure?

  • Velometer
  • Hydrometer
  • Hygrometer
  • Manometer

21: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?

  • When there is a space 6' or more above it
  • When there are sprinklers above
  • When its white
  • When it's used as part of a supply or return air system

22: A halide torch is most useful with a freon compression system

  • to remove from from TXV's and evaporator coils
  • to sweat flanges on the refrigeration piping
  • to release a sticking valve
  • to detect refrigeration leaks in piping joints

23: How does a centrifugal compressor create the pressure differential needed to move refrigerant through the system?

  • Nesting scrolls
  • Rotating vanes
  • Fan-like action
  • Suction and discharge valves

24: Pressure vessels with an internal volume of 3 cubic feet or more

  • do not need pressure relief protection
  • shall use pressure relief devices or fusible plugs
  • shall use pressure relief devices
  • shall use fusible plugs

25: What will occur if the strong solution in an absorption chiller becomes too strong?

  • The machine will cool excessively as the solution crystallizes.
  • The machine will cool excessively as the solution evaporates
  • The machine will stop cooling and the solution will evaporate.
  • The machine will stop cooling and solution will crystallize