Commercial Refrigeration Controls Quiz

Do you want to test your Commercial Refrigeration Controls knowledge? Take this 12 question quiz put together by The NEWS to see if you are a superstar or need to go back to the classroom.

How Well Do You Know Commercial Refrigeration Controls?

1. What three (3) elements are common to all electromechanical controls?
A. Sensor, linkage and output
B. Sensor, linkage and set-point adjustment
C. Sensor, linkage and differential adjustment
D. None of the above
2. Electromechanical temperature controls equipped with liquid filled sensing elements will react to temperature changes:
A. Only at the bulb
B. Only along the capillary
C. Anywhere along the bulb or capillary
D. None of the above
3. Characteristics of electromechanical temperature controls with liquid filled sensing elements include?
A. Set-point dial gradations are evenly spaced
B. Differential remains constant throughout the entire set-point range
C. Wide temperature ranges are possible
D. Temperature sensor is not affected by barometric pressure changes
E. All of the above
4. Characteristics of electromechanical temperature controls with vapor pressure sensing elements include?
A. Sensing elements are relatively immune to damage by over temperature
B. Case compensation is not required
C. A dent in the sensing bulb will not change the set-point temperature
D. Sensing elements are “spot” sensitive
E. All of the above
5. What is the correct way to route the capillary tube of a coil freeze protection control?
A. Back and forth along the horizontal plane of the evaporator coil
B. Back and forth along the vertical plane of the evaporator coil
C. Both “A” and “B” above are correct
D. None of the above
6. What features do electronic temperatures controls provide over their electromechanical equivalents?
A. Interchangeable remote sensor
B. Adjustable anti-short cycle compressor delay
C. Relay status light(s)
D. Selectable sensor failure mode options
E. All of the above
7. On a Low Pressure control and a Fan Cycling control the proper sequence of adjustment is?
A. Adjust the Cut-Out (or Differential) first and then adjust the Cut-In (or Range) setting
B. Adjust the Cut-In (or Range) setting first and then adjust the Cut-Out (or Differential)
C. Both “A” and “B” above are correct
D. None of the above
8. What are low side (suction) pressure controls used for in commercial refrigeration systems?
A. Pump down control
B. Compressor protection
C. Case temperature control
D. All of the above
9. Where is the preferred sensing location for a fan cycling control?
A. On the inlet of the condenser coil
B. On the outlet of the condenser coil
C. Anywhere on the condenser coil
D. None of the above
10. What two (2) functions are provided by electromechanical Lube Oil Protection controls?
A. Measure oil pump pressure and provide a time delay
B. Measure crankcase pressure and provide a time delay
C. Measure differential (or net) oil pressure and provide a time delay
D. None of the above
11. What features do electronic Lube Oil Protection controls provide over their electromechanical equivalents?
A. Single point sensing
B. Analog output signal for computer read-out of oil pressure
C. Selectable restart time on power failure
D. All of the above
12. What energy saving features are available in the latest electronic temperature controls for walk-in coolers and freezers?
A. Adaptive defrost
B. High and low speed fan control
C. Alarming
D. Remote communications
E. All of the above

Visit our Quizzes Page for other quizzes.

Sign Up. Stay Informed.

The #1 trusted source for the HVACR industry since 1926

SUBSCRIBE