B. Radiation

C. Convection

D. All A., B. & C.

A. hi/K

B. 2K/h0

C. 2hi/K

A. (?T)1/4

B. (?T)5/4

C. (?T)1/2

B. P and R

C. P and Q

D. R and S

A. Increases or decreases depending on number of shell passes

B. Remains unchanged

C. Increases

A. Liquid viscosity

B. Hot surface temperature

D. Liquid density

A. Surrounding temperature

C. Average temperature of the fin

D. Temperature of the fin end

A. Buffer zone

B. Turbulent core

C. Both A. and B.

B. Capacity of the evaporator is increased

C. True temperature drop increases

D. Both B. and C.

A. Flow velocity

C. Rate of heat transfer

D. Turbulence of shell side fluid

A. Decreases

B. Remain same

D. May increase or decrease depending on the type of gas

A. Evaporation on small scale is to be done

B. Corrosive liquids are to be concentrated

D. Fuel is cheaply available

A. There is no additional cost of pumping

C. Equal heat transfer co-efficients exist in various effects

D. Heat sensitive material can be handled

B. Sub-atmospheric

C. Atmospheric

D. Negative

A. A black body

B. Polished bodies only

C. Black painted bodies only

A. Air

C. Water

D. Brick

B. Steam ejector

C. Compressor

D. Vacuum pump

B. Equal to the difference between hot and cold fluids inlet temperature

C. ?

D. Equal to the difference between hot fluid inlet temperature and cold fluid outlet temperature

B. Coated

C. Dirty

D. Oily

A. Remain unaffected

B. Increase very rapidly

D. Decrease slowly

A. Increase

B. First decrease and then increase

D. Decrease

A. Horizontal tube

B. Calandria

B. Lower pressure drop through the exchanger is desired

C. Temperature of the incoming vapor is very high

D. Higher condensing film co-efficient is desired

A. Isothermal

B. Non-isothermal

D. Neither A. and B.

B. Is desirable to increase the film co-efficient

C. Increases the rate of condensation

D. Decreases thermal resistance

A. White & rough

B. White & smooth

D. Black & smooth

A. Unity

B. Zero

C. Different for all wavelengths

A. Non-dimensional factor

B. None of these

C. Conversion factor for individual film heat transfer co-efficient to overall heat transfer coefficient

B. Provide very large heat transfer co-efficient

C. Results in abruptly increased velocity

D. None of these

A. Monochromatic radiation only

B. Total radiation only

D. Only volumes and not to surfaces

A. 0

B. > 1

D. 1

A. 50

B. 40

C. 95

B. Tube thickness

C. Weight per unit length

D. None of these

A. Thermal diffusivity to mass diffusivity

B. Thermal diffusivity to momentum diffusivity

D. Momentum diffusivity to mass diffusivity

B. Decrease the steam economy & increase the capacity

C. Increase the steam economy & decrease the capacity

D. Decrease the steam economy & the capacity

A. 0

B. 0.5

C. 5

B. Mass diffusivity Momentum diffusivity

C. Thermal diffusivity Momentum

D. Thermal diffusivity Mass diffusivity

A. 12.0 kW/m2

B. 14.6 kW/m2

C. 11.2 kW/m2

A. ?t2

C. ?t

D. ?t1/2

A. 20 minutes

C. 10 minutes

D. 40 minutes

B. Because it is less costly

C. Because it occupies less floor area

D. When heat transfer area required is very high

A. None of these

B. It is difficult to maintain

D. It is not economic

A. D/4 and 2 D

C. D/2 and 2 D

D. D and 2 D

A. Copper

B. Plain carbon steel

D. Stainless steel

B. Baffle spacing & shell diameter

C. Viscosity, density & mass velocity of shell side fluid

D. Tube diameter & pitch

A. Remove the product

B. Admit the feed

D. Create vacuum

A. Heat transfer co-efficient

B. Mechanical strength of the equipment

C. Temperature gradient

A. BTU/hr. F. ft

B. BTU/hr. F

C. BTU/hr. ft

A. 0.95

C. 0

D. 0.78

A. Reduce the economy

C. Increase the economy

D. None of these