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Refrigeration Plant Cooling Load and System Capacity Quiz

12 Questions

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Refrigeration Plant Cooling Load and System Capacity Quiz

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Questions and Answers

What must the refrigeration plant's load always equal?

The compressor capacity

The temperature of the refrigerated medium

The cooling load (correct)

The mass of refrigerant circulated per unit time

What will happen if the plant operates at full capacity when the load is low?

The compressor capacity will tie up party

The system capacity control will influence the amount of refrigerant

The temperature of the refrigerated medium will rise above the set point (correct)

The mass of refrigerant circulated per unit time will drop

What is used to directly adjust the compressor capacity?

A control system that can directly adjust compressor capacity (correct)

A thermostat with a bimetal or filled system thermal sensing element

A control system that regulates evaporator capacity

A control system that responds to temperature, pressure, and humidity

How can compressor capacity be adjusted?

By cycling the compressor on and off (two-position control) Signup and view all the answers

What is used to detect the temperature of the refrigerated medium?

A thermostat with a bimetal or filled system thermal sensing element Signup and view all the answers

How can the system capacity control influence the amount of refrigerant?

By responding to changes in evaporator capacity, which means the compressor is controlled indirectly Signup and view all the answers

What is the primary function of a thermostat in a refrigeration system?

To start or stop the compressor based on temperature deviations Signup and view all the answers

What type of thermostat can directly control the power supply to small compressor motors?

Bimetal thermostat Signup and view all the answers

How does a filled system remote bulb thermometer control a compressor?

By actuating a magnetic motor starter (contactor) to start or stop the compressor Signup and view all the answers

What is the purpose of the temperature differential setting in a thermostat?

To prevent the compressor from short-cycling Signup and view all the answers

What is the relationship between the cut-in and cut-out points of a thermostat?

The cut-in point is always at a higher temperature than the cut-out point Signup and view all the answers

Which type of thermostat can be used to produce variable resistance, variable voltage, or variable current, or send digital signals to control systems?

Thermostats with electrical resistance elements or electronic temperature sensors Signup and view all the answers