Heat Transfer - 2 - Free MCQ Practice Test with solutions, GATE ME

Pick out the wrong statement.

Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the __________ zone.

The actual temperature drop across the heating surface in an evaporator depends on the

Which of the following is not used as a medium for high temperature heating ?

Presence of a non-condensing gas in a condensing vapour

Kirchoff s law applies to __________ radiation.

With the increase of temperature, the Col-burn jH factor

In case of evaporators, liquid entrainment results primarily due to

Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is

Baffles in the shell side of a shell and tube heat exchanger

The unit of heat transfer co-efficient in SI unit is

The number of kg vaporised per kg of steam fed to the evaporator is defined as

Pick out the wrong statement.

Economy of a multiple effect evaporator is not influenced much by the

Increasing the liquor level in the evaporator results in the

The equivalent diameter for pressure drop is __________ that for heat transfer.

Controlling heat transfer film co-efficient is the one, which offers __________ resistance to heat transfer.

The heat flux (from outside to inside) across an insulating wall with thermal conductivity, K= 0.04 W/m.^oK and thickness 0.16m is 10 W/m². The temperature of the inside wall is - 5^oC. The outside wall temperature is

Thermal conductivity of a conducting solid material depends upon its

Pick out the wrong statement.

The average heat transfer co-efficient for laminar film condensation on vertical surface is inversely proportional to (where, ΔT = Temperature drop across condensate film )

Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is

Which of the following is concerned with both heat and mass transfer ?

A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides

A 10 cm dia steam pipe, carrying steam at 180^oC, is covered with an insulation (conductivity = 0.6 W/m.^oC). It losses heat to the surroundings at 30^oC. Assume a heat transfer co-efficient of 0.8 W/m².^oC for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be