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What is done to increase the rate of heat transfer in the Velox boiler?

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What is done to increase the rate of heat transfer in the Velox boiler?

(a) The boiler is heated upto very high range of temperature

(b) The size of the boiler is changed as it is flexible

(c) High grade fuel is made use for the combustion

(d) Combustion gases are circulated through tubes with supersonic speed

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This is a very interesting question from Types of High Pressure Boilers in chapter Steam Generators & Accessories of Energy Engineering

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The correct choice is (d) Combustion gases are circulated through tubes with supersonic speed

The best explanation: This boiler uses oil or gaseous fuel inside furnace for its combustion. The combustion gases are circulated through the tubes with supersonic speed velocity to increase the heat transfer rate between the hot gases and feed water.

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