The rate of heat transfer is a product of overall heat transfer co-efficient, the difference in temperature and the

The scales form in heat exchanges after a period of operation and provide additional resistance to heat transfer with some heat transfer coefficient . The reciprocal of this scale heat transfer coefficient is called .

A

scaling factor

B

forming factor

C

resisting factor

D

fouling factor

The concept of overall coefficient of heat transfer is used in heat transfer problems of

A

Conduction

B

Convection

C

Radiation

D

Conduction and convection

The concept of overall coefficient of heat transfer is used in case of heat transfer by

A

Conduction

B

Convection

C

Radiation

D

Conduction and convection

Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the

A

Surrounding temperature

B

Average temperature of the fin

C

Temperature of the fin end

D

Constant temperature equal to that of the base

Scheme-1: C6H5N2Cl→CuCNC6H5CN→H2o/H+C6H5COOH→∆Product-I Scheme-2: C6H5NO2→Fe/HCLC6H5NH2→N2NO3+HCL, 273KC6H5N2Cl→H2O/H+Product-II Scheme-3: CH3COOH→NH3CH3CONH2→NaOBrProduct-III উল্লিখিত Scheme সমূহে Product-I, Product-II এবং Product-III হলো যথাক্রমেঃ

A

C6H5COONH4, C6H5Cl and CH3OH

B

C6H5CONH2, C6H5NH2 and CH3OH

C

C6H5CONH2, C6H5NH2 and CH3NH2

D

C6H5CONH2, C6H5OH and CH3OH

Which of the following is having the lowest value of overall heat transfer coefficient?

A

Feed water heaters

B

Air condensers

C

Air to low viscosity liquids

D

Steam condensers

The unit of overall coefficient of heat transfer is

A

kcal/m²

B

kcal/hr °C

C

kcal/m² hr °C

D

kcal/m hr °C

For small temperature difference, the heat transfer rate as per Newton's law of cooling is proportional to (where, Δt = excess temperature)

A

Δt

B

Δt²

C

Δt³

D

$$\sqrt {\Delta {\text{t}}} $$

A manufacturer sells three products i.e. A, B and C. Product A cost 200 and sells for 250, Product B costs 150 and sells for 180, Product C costs 100 and sells for 110. On which product, he has maximum percentage of profit?

A

B only

B

A and B both

C

A only

D

C only

A manufacturer sells three products i.e A, B and C. Product A costs 200 and sells for 250, Product b costs 150 and sells for 180, product C costs 100 and sells for 110. On which product, he has maximum percentage of profit?

A

B only

B

A and both

C

A only

D

C only

The rate of heat transfer is a product of overall heat transfer co-efficient, the difference in temperature and the

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