Heat Transfer
In a multipass shell and tube heat exchanger, tube side return pressure loss is equal to __________ the velocity head

square root of
twice
four times
none of the listed here

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Heat Transfer
In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred

By heating an intermediate material (like chequor bricks) and then heating the air from this hot material
By direct contact of hot flue gas with air
None of these
Through a metallic wall

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