Heat Transfer MCQ Questions & Answers | Chemical Engineering

A. $$\frac{{\text{K}}}{{{{\text{h}}_0}}}$$

B. $$\frac{{2{\text{K}}}}{{{{\text{h}}_0}}}$$

C. $$\frac{{{{\text{h}}_0}}}{{\text{K}}}$$

D. $$\frac{{{{\text{h}}_0}}}{{2{\text{K}}}}$$

A. Give larger area per tube

B. Use metal fins of low thermal conductivity

C. Facilitate very large temperature drop through tube wall

D. Are used for smaller heat load

A. Absorptivity = 1

B. Reflectivity = 1

C. Emissivity = 0

D. Transmissivity = 1

A. 0.5

B. 1

C. 0

D. 2

A. Dowtherm

B. Mercury

C. Liquid metal (e.g. molten sodium)

D. Fused salts (e.g., an eutectic mixture of 53% KNO₃, 40% NaNO₂ and 7% NaNO₃)

A. 0.001

B. 0.72

C. 70

D. 150

A. Tar dolomite bricks followed by asbestos

B. Fireclay refractory followed by aluminium sheet

C. Cotton followed by aluminium foil

D. 85% magnesia cement and glass wool

A. Long vertical evaporator

B. Horizontal tube evaporator

C. Agitated film evaporator

D. Calenderia vertical tube evaporator

A. Is a dimensionless quantity

B. Does not provide a safety factor for design

C. Accounts for additional resistances to heat flow

D. None of these

A. m²°K/W

B. W/m²°K

C. m²°K

D. m°K/W