Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

1: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against

• 108
• 116
• 88
• 38

2: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is

• boost voltage
• pick up voltage
• lift voltage
• run voltage

3: One ton of refrigeration is defined as ______ btu/minute.

• 60
• 12,000
• 200
• 720,000

4: An example of an "Expendable Refrigerant" is

• liquid nitrogen
• liquid oxygen
• ammonia
• lithium bromide

5: A machine room with a refrigerant system using ammonia shall

• be provided with a continuously operated ventilation system
• be considered a non-hazardous location in accordance with National Electrical code
• have no flame producing apparatus permanently installed and operated
• All of the above

6: An accumulator can be located between the

• evaporator and compressor
• compressor and condenser
• first stage and second stage compressors
• condenser and evaporator

7: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is

• drawing RLA and is running as it should
• drawing LRA and is seized and should be replaced.
• running hot
• none of the above

8: What would be the classification of a prison?

• Institutional
• Place of assembly
• Large mercantile
• Industrial

9: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.

• CFC-11
• Lithium bromide
• HCFC-123
• ammonia

10: The Board of Boilers adopts by reference

• Montreal Protocol Safety Code
• the 1997 ANSI/ASHRAE Safety Code
• the MACS Pressure Vessel Code of Massachusetts
• MSCA Code

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

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

12: An example of direct system is

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

13: What is used to check very low air pressures in air conditioning duct?

• Manometer
• Vacuum gauge
• Anemomter
• Barometer

14: Two systems using separate refrigerants that are superimposed upon one another is called

• single stage
• indirect
• booster
• cascade

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

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

16: The boiling point of a refrigerant is based on

• Temperature
• Heat content
• a pressure-temperature relationship
• None of the above.

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

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

18: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

• 66
• 22
• 25
• 50

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

• 36
• 18
• 24
• 48

20: What instrument is used to measure very high resistance?

• meg ohmmeter
• ammeter
• tape measure
• voltmeter

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

• Thermometer
• Hygrometer
• Hydrometer
• Manometer

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

• 180
• 970
• 212
• 144

23: High pressure controls should be set no higher than

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

24: 1 HP = ____ Watts?

• 3.1416
• 3,412
• 746
• 11,239

25: When a refrigerating machinery room is used, the emergency procedures shall be posted

• inside the room, immediately adjacent to each door
• on a conspicuous card located near the compressor
• on a conspicuous card located near the evaporator
• outside the room, immediately adjacent to each door