Chemical Engineering Basics
Function of feed check valve in a boiler is to

Regulate the water flow to boiler
Check the water level in the boiler drum
Prevent the back flow of water
Facilitate circulation of high pressure feed water

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Chemical Engineering Basics
Compression ratio of an I.C. engine is the ratio of the

Pressure after compression to that before compression
None of these
Volume of air in cylinder before compression to that after compression
Clearance volume to the volume swept by piston per stroke

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