Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: 1 Watt = ______ BTU's?

  • 3.412
  • 12
  • 7.216
  • 4.482

2: Class T machine room

  • shall include closets used for setting equipment
  • shall have remote controls to stop the action of the refrigerant compressor
  • has no flame producing apparatus permanently installed
  • shall have refrigerant leak detecting systems installed inside and outside the room

3: What pipe can not be used for refrigeration?

  • K
  • L
  • N
  • M

4: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 18
  • 33
  • 50
  • 22

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

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

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

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

7: Ammonia (NH3) is a group III refrigerant

  • True
  • False

8: The main purpose of a refrigerant detector in a machinery room is to

  • inform there is a refrigerant leak int he system
  • detect toxins in the air caused by a refrigerant leak
  • to set off an alarm when there is refrigerant present inside the room
  • all of the above

9: Low ambient controls are used when

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

10: When an inspection is needed, how often must it be done?

  • every 36 months
  • every 24 months
  • annually
  • every 18 months

11: A tachometer is an instrument used to measure

  • air velocity
  • static pressure
  • speed
  • RPM

12: What happens to copper joints when overheated?

  • nothing
  • joint becomes oxidized and ditorted
  • copper becomes harder
  • none of the above

13: In a motor, an internal overload might open if

  • there's a direct short
  • there's an excess current draw through the motor
  • there was a high pressure refrigerant was used for a low pressure system.
  • there's an open start winding

14: A plug containing an alloy that will melt at a specific temperature to relief pressure is a

  • relief plug
  • fusion plug
  • rupture plug
  • fusible plug

15: Watt's Law indicates Volts X Amps = _________.

  • Ohms
  • Current
  • Watts
  • Resistance

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

  • 48
  • 18
  • 36
  • 24

17: Whoever owns/uses a refrigeration or air conditioning system covered by this code

  • must notify the Department of Public Safety prior to starting the system
  • shall be licensed by the Commonwealth of Massachusetts according to CMR 522
  • shall make application for inspections to the Chief of Inspectors
  • None of the above

18: Laten heat is associated with a change in state of a refrigerant but not temperature

  • True
  • False

19: Total heat of a substance is considered

  • specific heat
  • sensible heat
  • empathetical
  • enthalpy

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

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

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

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

22: What must be done to refrigerant pipes before being buried?

  • Leaked checked
  • Certified
  • Coated
  • Encased

23: Increasing superheat will do what to your frost line?

  • Could either increase or decrease depending on the load conditions
  • Increasae
  • Decrease
  • Nothing

24: E = I X R is

  • Amps Law
  • Impedance Law
  • Ohms Law
  • Watts Law

25: Heat is a form of

  • power
  • matter
  • energy
  • work