Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What device measures the specific gravity of a substance?

  • Manometer
  • Hygrometer
  • Thermometer
  • Hydrometer

2: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.

  • True
  • False

3: In a horizontal shell & tube condenser, the ammonia is liquefied by

  • passing thru the tubes from top to bottom
  • removing the latent heat of fusion
  • water sprayed over condenser
  • removing the latent heat of vaporization

4: Excessive head pressure is often caused by

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

5: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and

  • explosion precautions must be taken
  • the owner shall be informed
  • no flames shall be permitted
  • gas masks must be worn

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

  • Watts
  • Ohms
  • Resistance
  • Current

7: 1 HP = ____ Watts?

  • 11,239
  • 3,412
  • 746
  • 3.1416

8: A capacitor in series with the start windings will do what?

  • Decrease the RLA to within 10% of its rating
  • Nothing
  • Increase starting torque
  • Increase run efficiency by 10% of its rating

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

  • 155F
  • 158F
  • 32F
  • 45F

10: What is the leaving chilled water set point for water chiller systems?

  • 45F
  • 66F
  • 55F
  • 38F

11: A start capacitor in series with a start winding will

  • increase running efficiency
  • increase the amp draw of the motor
  • decrease the amp draw of the motor
  • increase starting torque

12: The best way to detect ammonia in brine is

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

13: Megaohm meter's main function is

  • to detect weak motor winding insulation of a refrigeration or air conditioning compressor by creating high DC voltages to the compressor
  • to detect very high resistances to ground of refrigeration or air conditioning compressors
  • to test very high value capacitors for large 3-phase refrigeration compressors and blower motors.
  • Both a and b are correct

14: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be

  • 66.1 psig
  • 70.8 psig
  • 43.3 psig
  • 50.2 psig

15: 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

16: How many refrigerant classifications are there for flammability?

  • 3
  • 2
  • 1
  • 7

17: How is bring measured?

  • manometer
  • hygrometer
  • anemometer
  • hydrometer

18: The best way to determine the voltage requirement for an electrical component is to

  • read the nameplate data
  • read the voltage with a mulitmeter
  • check with the utility company
  • determine the capacity of the service panel

19: Joints in piping for refrigeration containing parts must withstand temperatures of ___?

  • 800F
  • 600F
  • 700F
  • 1000F

20: Suction valve unloaders afford an effective means of

  • capacity control
  • evaporator control
  • superheat control
  • refrigerant control

21: Which of the following is NOT a positive displacement compressor?

  • scroll
  • screw
  • reciprocating
  • centrifugal

22: Ammonia (NH3) is a group III refrigerant

  • True
  • False

23: The low pressure oil safety switch

  • resets itself after the time delay has terminated
  • must be reset manually
  • resets itself automatically
  • never trips

24: Give an example of a secondary coolant?

  • R-410A
  • R-717
  • R-718
  • R-12

25: The difference between saturated liquid and saturated vapor is

  • pressure
  • volume
  • heat
  • temperature