Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: It takes how many BTU/hr to melt one pound of ice at 32F

  • 970
  • 212
  • 144
  • 180

2: The amount of heat required to raise the temperature of 1 lb of water 1F is?

  • 1 Therm
  • 1 Kelvin
  • The rate of conduction
  • 1 BTU

3: All low-pressure chillers use which type of compressor?

  • Rotary
  • Reciprocating
  • Centrifugal
  • Scroll

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

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

5: 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

6: What effect does the temperature of air have on humidity?

  • warmer air holds more moisture then cooler air
  • cooler air holds more moisture then warmer air
  • air has no effect of humidity
  • none of the above

7: Low pressure systems have what kind of compressor?

  • Scroll
  • Centrifugal
  • Rotary
  • Reciprocating

8: The formula for Pure Power in a resistance circuit is

  • Kw = volts X amps
  • Watts = volts X amps
  • Watts X power factor
  • Watts X amps.

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

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

10: Two capacitors are wired in parallel. One capacitor has a value of 15uf. The other has a value of 25uf. What is the total value supplied?

  • 25 uf
  • 20 uf
  • 15 uf
  • 40 uf

11: Heat cannot of itself, pass from a

  • cold to a warmer body
  • warm to a colder body
  • state of hot energy to a state of cold energy
  • None of the above

12: The critical temperature of a refrigerant gas occurs when

  • any increase in pressure will not liquefy the gas
  • the gas returns to a liquid
  • any decrease in pressure will cause condensation
  • the gas is no longer saturated

13: Electricity involves the movement of electrons in atoms

  • True
  • False

14: Where are the three places that the discharge from an ammonia relief valve be piped?

  • To chemical neutralizing tank only
  • Underground, into drain, into mechanical room
  • Atmosphere, Tank containing water, where the AHJ indicates.
  • None of the above.

15: The 522 CMR 9.00 has adopted for reference ASHRAE ____

  • 15
  • 25
  • III
  • 10

16: All serviceable components of a refrigeration system shall be provided with

  • service manuals
  • safe access
  • name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
  • manufactures instructions on start-up procedures

17: What is not a requirement of a Class T machine room?

  • Tight fitting doors
  • Self-closing doors
  • Fire hose connected to the building fire protection system.
  • Automatic ventilation

18: The best way to detect ammonia in brine is

  • nessler regaent
  • carbonation of soda
  • CO2 gas
  • potassium of line

19: 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

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

20: Low ambient controls are used when

  • when systems run all year round
  • economizers are used
  • on air conditioning systems only
  • always

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

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

22: The purpose of a receiver is

  • a vessel to store refrigerant outside the system
  • to increase the capacity that the system can hold
  • to use a a later date
  • all of the above

23: The principle used in continuous type absorption systems is

  • Boyle's Law
  • Ohm's Law
  • Charles's Law
  • Dalton's Law

24: What type of fuses must be used on a HVAC system?

  • TR Type, Duel Element, Time Delay
  • Fast blow
  • 10% lower than RLA
  • none of the above

25: 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