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Question

The receiver tank will help remove water from the system by giving ________.

This question was previously asked in
RRB ALP/Technician 2018 CBT 2 Electronics Mechanic Question Paper (23-Jan-2019) (Shift 1)
The correct answer is
the air a chance to become cool

Receiver Tank Water Removal Principle

A receiver tank functions in water removal by leveraging the principle of condensation. Air, especially compressed air, often contains moisture (water vapor).

How Cooling Causes Condensation

The capacity of air to hold moisture decreases significantly as its temperature drops. When warm, moist air enters the receiver tank, it has more time and space to cool down.

  • Cooling: As the air inside the tank cools, its ability to retain water vapor diminishes.
  • Condensation: The excess water vapor, which the cooler air can no longer hold, changes state from gas (vapor) to liquid (water). This process is called condensation.
  • Collection: The condensed liquid water collects at the bottom of the receiver tank and can be periodically drained out, effectively removing water from the system.

Therefore, the receiver tank facilitates water removal by giving the air a chance to cool, leading to condensation.

Option A, "the air a chance to become cool", directly explains this mechanism.

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