Question:
How does the L.P. cutout protect the compressor ?
How does the L.P. cutout protect the compressor ?
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A cutout switch stops the compressor when suction pressure drops too low.
Updated On: Oct 20, 2026
- By shutting off the compressor
- By increasing the refrigerant flow
- By increasing the compressor speed
- By decreasing the refrigerant flow
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The Correct Option is A
Solution and Explanation
Step 1: Understand the L.P. cutout:
The L.P. cutout is a low pressure switch fitted on the suction side of the compressor. It senses the pressure of the refrigerant returning to the compressor.
Step 2: See how it protects the compressor:
If the suction pressure falls too low, for example from a gas leak or a choked line, the compressor can run without enough refrigerant and oil return. This can overheat and damage it. When the pressure drops below the set value, the switch opens its contacts and stops the compressor. So (A) is correct.
Step 3: Why the other options are wrong:
A safety switch does not increase refrigerant flow, so (B) is wrong.
It does not raise the compressor speed, since that would add more load, so (C) is wrong.
It does not control the flow of refrigerant either, since it only switches the compressor, so (D) is wrong.
Final Answer:
The L.P. cutout protects the compressor by shutting it off. This is option (A).
The L.P. cutout is a low pressure switch fitted on the suction side of the compressor. It senses the pressure of the refrigerant returning to the compressor.
Step 2: See how it protects the compressor:
If the suction pressure falls too low, for example from a gas leak or a choked line, the compressor can run without enough refrigerant and oil return. This can overheat and damage it. When the pressure drops below the set value, the switch opens its contacts and stops the compressor. So (A) is correct.
Step 3: Why the other options are wrong:
A safety switch does not increase refrigerant flow, so (B) is wrong.
It does not raise the compressor speed, since that would add more load, so (C) is wrong.
It does not control the flow of refrigerant either, since it only switches the compressor, so (D) is wrong.
Final Answer:
The L.P. cutout protects the compressor by shutting it off. This is option (A).
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