Exam Question
(a) What are the advantages and disadvantages of the single-coil type and the straight-tube type of inter-cooler for air compressor? (10)
(b) Why are the tubes and coils generally made of copper? (6)
Class 4 (4th Engineer)
MEKG
📅 Feb 2026
Reference Answer
### (a) Advantages and Disadvantages of Intercooler Types
The primary function of an intercooler in a multi-stage air compressor is to reduce the temperature of the compressed air between stages. This is critical for several reasons:
- **Increased Efficiency:** Cooling the air reduces its volume, thereby decreasing the work required for compression in the subsequent stage.
- **Improved Volumetric Efficiency:** Denser, cooler air entering the next stage improves the mass of air handled.
The primary function of an intercooler in a multi-stage air compressor is to reduce the temperature of the compressed air between stages. This is critical for several reasons:
- **Increased Efficiency:** Cooling the air reduces its volume, thereby decreasing the work required for compression in the subsequent stage.
- **Improved Volumetric Efficiency:** Denser, cooler air entering the next stage improves the mass of air handled.
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