Refrigeration Quiz - 10 Questions

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| By Catherine Halcomb

Catherine Halcomb

Community Contributor

Quizzes Created: 1518 | Total Attempts: 5,459,314

Questions: 10 | Attempts: 133 | Updated: Mar 20, 2023

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Questions and Answers

1.

How do you test a PTC relay?
- A.
  
  Check resistance between start and run, should have 20 - 50 ohms
- B.
  
  Check voltage at the PTC relay
- C.
  
  Check resistance between start and run, should have 4 - 10 ohms
- D.
  
  There is no way to accurately check a PTC relay
Correct Answer
C. Check resistance between start and run, should have 4 - 10 ohms

Explanation
To test a PTC relay, one should check the resistance between the start and run terminals. The resistance should ideally measure between 4 to 10 ohms. This test helps determine if the PTC relay is functioning properly.

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2.

What does PTC stand for, in regards to a PTC relay?
- A.
  
  Pressure Temperature Coefficient
- B.
  
  Positive Temperature Coefficient
- C.
  
  Positive Time Compressor
- D.
  
  Pressure Temperature Compressor
Correct Answer
B. Positive Temperature Coefficient

Explanation
The correct answer is "Positive Temperature Coefficient." In regards to a PTC relay, PTC stands for Positive Temperature Coefficient. This refers to a type of relay that uses a temperature-sensitive resistor to control the flow of current. As the temperature increases, the resistance of the PTC relay also increases, causing the current to decrease. This characteristic makes PTC relays useful for protecting electrical circuits from overheating and overcurrent situations.

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3.

What function does a relay do on a refrigerator?
- A.
  
  Makes ice
- B.
  
  Monitors the temperature in the fresh food compartment
- C.
  
  Starts the compressor
- D.
  
  Absorbs contaminants in the sealed system
Correct Answer
C. Starts the compressor

Explanation
A relay on a refrigerator is responsible for starting the compressor. The compressor is an essential component that circulates refrigerant throughout the system, allowing the refrigerator to cool and maintain a desired temperature. The relay acts as a switch, sending an electrical signal to the compressor to initiate its operation. Without the relay, the compressor would not start, and the refrigerator would not be able to cool properly.

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4.

The purpose of the defrost cycle to remove frost from
- A.
  
  The icemaker
- B.
  
  The freezer shelving
- C.
  
  The condenser
- D.
  
  The evaporator
Correct Answer
D. The evaporator

Explanation
The purpose of the defrost cycle is to remove frost from the evaporator. During normal operation, moisture in the air inside the freezer can condense on the evaporator coils and freeze, forming a layer of frost. This frost can reduce the efficiency of the freezer and prevent proper cooling. The defrost cycle activates periodically to melt this frost, allowing the evaporator coils to operate efficiently and maintain proper cooling temperatures.

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5.

What is the state of refrigerant in a condenser when a refrigerator is running?
- A.
  
  High pressure vapor/liquid
- B.
  
  Low pressure vapor/liquid
- C.
  
  No pressure vapor/liquid
- D.
  
  None of the above
Correct Answer
A. High pressure vapor/liquid

Explanation
When a refrigerator is running, the refrigerant in the condenser is in a state of high pressure vapor/liquid. This is because the condenser is responsible for releasing heat from the refrigerant, causing it to condense from a high pressure vapor to a high pressure liquid. The high pressure is necessary for the refrigerant to effectively transfer heat and maintain the cooling process in the refrigerator.

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6.

What is the type of lubricant used for door gaskets?
- A.
  
  Thin film of WD-40 on the hinge side
- B.
  
  Thin film of vasoline on the hinge side
- C.
  
  Thin film of zoom spout on the hinge side
- D.
  
  Thin film of lithium grease on the hinge side
Correct Answer
B. Thin film of vasoline on the hinge side

Explanation
Vaseline is commonly used as a lubricant for door gaskets because it is a thick, petroleum-based jelly that helps to reduce friction and keep the gaskets flexible. Applying a thin film of Vaseline on the hinge side of the door gaskets can help to prevent them from sticking or squeaking when the door is opened or closed. The viscosity of Vaseline allows it to stay in place and provide long-lasting lubrication.

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7.

What is the state of refrigerant in an evaporator when a refrigerator is running?
- A.
  
  High pressure vapor/liquid
- B.
  
  Low pressure vapor/liquid
- C.
  
  No pressure vapor/liquid
- D.
  
  None of the above
Correct Answer
B. Low pressure vapor/liquid

Explanation
When a refrigerator is running, the state of refrigerant in the evaporator is a low pressure vapor/liquid. This is because the evaporator is responsible for absorbing heat from the refrigerator's contents, causing the refrigerant to evaporate and turn into a low pressure vapor. However, there may still be some liquid refrigerant present in the evaporator as well. Therefore, the correct answer is low pressure vapor/liquid.

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8.

Defrost bi-metals are universal and can fit into any model or brand.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
The statement is false because defrost bi-metals are not universal and cannot fit into any model or brand. Different models and brands may have different specifications and requirements for their defrost systems, including the type and size of the bi-metal used. Therefore, it is important to select a defrost bi-metal that is specifically designed and compatible with the model or brand of the appliance.

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9.

What is this component called?
- A.
  
  Defrost Heater
- B.
  
  Defrost Timer
- C.
  
  Defrost Bi-metal
- D.
  
  None of the above
Correct Answer
B. Defrost Timer

Explanation
The correct answer is Defrost Timer. The defrost timer is a component in a refrigerator or freezer that controls the automatic defrost cycle. It regulates when the defrost heater turns on to melt any ice buildup on the evaporator coils, preventing them from becoming blocked and ensuring efficient cooling. The defrost timer typically operates on a set time schedule, activating the defrost cycle at regular intervals.

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10.

How do you check a thermistor?
- A.
  
  Isolate and check for less than one ohm
- B.
  
  Isolate and check for more than one ohm
- C.
  
  Check for the appropriate resistance based on temperature - each one is specific to the model
- D.
  
  Check for the appropriate resistance based on temperature - at room temperature usually 1100 ohms
Correct Answer
C. Check for the appropriate resistance based on temperature - each one is specific to the model

Explanation
The correct answer is to check for the appropriate resistance based on temperature, as each thermistor model has a specific resistance value at different temperatures. By measuring the resistance of the thermistor, one can determine if it is functioning properly and accurately sensing temperature changes.

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Refrigeration Quiz - 10 Questions

How do you test a PTC relay?

What does PTC stand for, in regards to a PTC relay?

What function does a relay do on a refrigerator?

The purpose of the defrost cycle to remove frost from

What is the state of refrigerant in a condenser when a refrigerator is running?

What is the type of lubricant used for door gaskets?

What is the state of refrigerant in an evaporator when a refrigerator is running?

Defrost bi-metals are universal and can fit into any model or brand.

What is this component called?

How do you check a thermistor?