Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: If a halide torch is used for leak detection, what color is the flame if it detects a leak?

  • blue
  • orange
  • green
  • red

2: The discharge relief valve is located (9.4.6)

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

3: A motor starter contains a thermal overload and a

  • solenoid
  • transformer
  • 3-way relay
  • contactor

4: 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

5: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.

  • 100%
  • 90%
  • 75%
  • 80%

6: What was the main reason for enacting the no venting rule of July 1, 1992?

  • Ozone depletion
  • Green house effect
  • Global warming potential
  • All of the above

7: The heat picked up in the evaporator must equal to

  • the heat gained by the condenser
  • the heat lost by the medium being cooled
  • the heat of compression
  • the heat giving by the condenser

8: A High-Probablity system

  • is a system highly likely to leak from a failed connection or component of such system
  • is such that a leak of refrigerant from failed connections will enter the unoccupied space
  • 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 occupied space

9: When is the only time you can leave a service container attached to a system?

  • Leaking system
  • Recovery
  • Charging
  • Both b and c

10: What refrigerant doesn't have to be classified?

  • R-134A
  • R-422A
  • R-718
  • R-717

11: High pressure controls should be set no higher than

  • 25% of set point
  • 90% of set point
  • 80% of set point
  • 10% of set point

12: The certificate of inspection

  • shall be posted on the compressor shell or electrical panel at the unit
  • shall be $20 and an additional fee of $1 for each tone above 20 tons
  • shall be authorized by a notarized insurance company
  • shall be posted and protected from dirt, water, and other elements

13: Where must a refrigeration contractor's license number be displayed?

  • Trucks, license plates, and uniforms
  • Trucks, invoices, and advertising
  • Uniforms, checks, and invoices.
  • Truck, office, every job, and on all equipment

14: Excessive head pressure is often caused by

  • leaking reed valve on the discharge side
  • insufficient refrigerant
  • thermostat set too high
  • air cooled condenser is plugged

15: Systems containing more than 110 pounds must have stop valves located at the

  • compressor suction inlet
  • compressor discharge outlet
  • receiver inlet and outlet
  • All of the above

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

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

17: 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 friction head
  • GPM and unbalanced head and friction head
  • GPM, pipe size, and equivalent head.

18: Capacitors are rated in

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

19: Which of the following types of oils are hygroscopic?

  • polyolester (POE)
  • polyalkylene glycol (PAG)
  • naphthene mineral
  • both a and b

20: What is the purpose of a surge capacitor on a contactor?

  • to balance the sine waves
  • to keep the contactor pulled in
  • to protect low voltage equipment
  • to provide smoother start/stops

21: R-22 falls under which safety classification?

  • A-1
  • B-1
  • A-2
  • B-2

22: What is the typical air conditioning operating pressures for 410A?

  • 60 psi suction, 210 psi discharge
  • 25 psi suction, 125 psi discharge
  • 105 psi suction, 350 psi discharge
  • None of the above

23: At higher altitudes, the boiling point of refrigerant is

  • the same
  • higher
  • lower
  • equal to the coefficient of water at 32F

24: Where can 50/50 solder be used on?

  • suction line
  • liquid line
  • discharge line
  • none of the above

25: The evaporator is a device to

  • store liquid refrigerant
  • remove heat from the refrigeration system
  • absorb heat into the refrigeration system
  • Keep the compressor busy