Heat Transfer MCQs

0

1

>1

<1

√(ΔT₁ . ΔT₂)

2.(ΔT₁ . ΔT₂)/(ΔT₁ + ΔT₂)

2.(ΔT₁ . ΔT₂)(ΔT₁ – ΔT₂)

(ΔT₁ – ΔT₂)/(ΔT₁ . ΔT₂)

Increases

Decreases

Is not affected

May increase or decrease; depends on the feed

Liquid depth over the heating surface

Solution being evaporated

Pressure difference between the steam chest and the vapor space above the boiling liquid

All of the above

Molten sodium (a coolant used in fast breeder reactor)

Water

Transformer oil

Dilute H₂SO₄

St = f/2

St = f/4

St = 4f

St = f1/2

15 min

22 min

44 min

51 min

Eddies current

Conduction

Convection

None of these

Dowtherm

Molten sodium

Water

Air

Dittus-Boeltier equation

Sieder-Tate equation

Nusselt equation

None of these