A. jH = (St)2/3(Pr) = f/2

B. jH = (St)1/3(Pr) = f/2

D. jH = (St)(Pr)1/3 = f/2

A. In a horizontal tube evaporator, surface blanketing by air is avoided

B. Split ring type and pull through type floating heads are two commonly used floating heads is

D. t exchangers

E. Pressure drop on the shell side of a heat exchanger depends upon tube pitch also

B. The boiling point of a solution is affected by liquid head as well as boiling point elevation

C. Heat transfer from a hot body to cold body by the emission of heat waves is called radiation

D. None of these

A. Higher is the temperature of the radiating body, higher is the wavelength of radiation

B. idence

C. e in temperature

D. The wavelength corresponding to maximum mono-chromatic emissive power increases with

F. inder</strong>

A. ch is higher</strong>

B. uid and is to be transferred for storage

D. The condensing film co-efficient is about 3 times lower for vertical condenser as compared to the equivalent horizontal condenser for identical situation

E. In industrial practice, sub-cooling of condensate is required, when the condensate is a volatile

F. Film co-efficient for vaporisation decreases as a result of vapor binding

B. ditions of temperature</strong>

C. Finned tube heat exchangers are suitable for heating air by steam

D. Economy of a multiple effect evaporator is not influenced by the boiling point elevation

E. Double pipe heat exchangers are mostly used in the field of refrigeration

B. The ratio NNu/NRe . Npr is called the Stanton number

C. The Peclet number is a measure of the ratio of energy transport by convection to that by conduction

D. Fluid movement under the influence of buoyant forces resulting from change in density takes place in case of natural convection

A. Vaporisation of organic substances in evaporator mostly causes foam formation

C. Ratio of its capacity to economy equals the steam consumption in kg/hr in an evaporator

D. Bubble size increases with the dynamic viscosity of the liquid in case of nucleate pool boiling

B. The emissivity of a polished surface is quite low

C. The emissivity of a surface increases with increase in surface roughness

D. The emissivity of a non-metallic surface decreases with increase in the temperature

A. Nu = (Pr) (St)

B. Nu = (Re) (Pr) (Gz)

D. Nu = (Re) (Pr)

A. Phase change in case of a pure fluid at a given pressure from liquid to vapor or vice-versa occurs at saturation temperature

B. The controlling resistance in case of heating of air by condensing steam is in the air fil

C. The log mean temperature difference (LMTD) for counter flow and parallel flow can be theoretically same when any one of the fluids (hot or cold fluid) passes through the heat exchanger at constant temperature

D. rply, when a temperature cross occurs</strong>