Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

1: By using nitrogen within a pipe during brazing operation,

• Exterior scale formation is minimized
• The explosion hazard is confined
• Copper oxide formation is prevented
• Discoloration is prevented

2: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?

• 600 watts
• 746 watts
• 1000 watts
• 5KW

3: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

• UL and UR
• UL and UM
• UM or UL
• UV or UR

4: Electricity involves the movement of electrons in atoms

• True
• False

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

• Ohms
• Current
• Resistance
• Watts

6: "I" represents _______ in the Watt's law formula.

• amperage
• watts
• voltage
• reactance

7: When a refrigeration or air conditioning system is installed

• the form of certificate shall be authorized by the Department of Pubic safety
• it shall be approved by the owner for proper operation.
• it shall not be operated below prescribed pressures
• a field inspection shall be made before it is put into service

8: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.

• 550
• 100
• 350
• 50

9: Pressure limiting devices are not required for systems containing less then ________ refrigerants.

• 13.9 lbs
• 44 lbs
• 22 lbs
• 6.6 lbs

10: An example of direct system is

• rooftop unit
• chiller
• absorber
• none of the above

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

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

12: Gauge pressure is

• Atmospheric pressure
• Force of pressure above that of atmosphere
• Barometric pressure
• Absolute pressrue

13: How much refrigerant can be stored in a mechanical room outside of the system?

• 330
• 100
• 150
• 200

14: _____ and its alloys are suitable for use with ammonia systems.

• Aluminum
• Magnesium
• Zinc
• Copper

15: A normal operating evaporator temperature of R-22 for air conditioning is typically

• 45F
• 32F
• 58F
• 55F

16: R-12 is

• dichlorodifluoromethane
• dichloromethane
• dichlorofluoromethane
• trichlorofluoromethane

17: What is the voltage of each leg of a 480 Volt three-phase motor?

• 277v
• 208v
• 240v
• 120v

18: 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
• 15 uf
• 40 uf
• 20 uf

19: What section governs pressure vessels?

• Section ASHREA 34
• Section 1 ASHREA 15 ASME fired
• Section 8 ASHREA 15 ASME unfired
• OSHA

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

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

21: A self contained system

• is a unit system Group II refrigerants only
• is a unit system Group I refrigerants only
• is any system or part of a system used to increase evaporation by expansion or vaporization
• is a complete factory made and tested system

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

• atmosphere, tank containing water, where the A.H.J. indicates
• underground, into drain, into mechanical room
• to chemical neutralizing tank only
• none of the above

23: R-410A can segregate in the system or chemically change its composition due to a leak.

• True
• False

24: Setting a pressure relief device shall not exceed ___ of the design pressure

• 90%
• 80%
• 75%
• 100%

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

• 600F
• 1000F
• 700F
• 800F