# Test: Heat Transfer - 3

## 25 Questions MCQ Test Heat Transfer | Test: Heat Transfer - 3

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Attempt Test: Heat Transfer - 3 | 25 questions in 25 minutes | Mock test for Chemical Engineering preparation | Free important questions MCQ to study Heat Transfer for Chemical Engineering Exam | Download free PDF with solutions
QUESTION: 1

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QUESTION: 2

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QUESTION: 3

### The dimensionless group in mass transfer that is equivalent to Prandtl number in heat transfer is

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QUESTION: 4

Finned tube heat exchangers

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QUESTION: 5

The absorptivity of a grey body at a given temperature __________ with increasing wavelength of radiation.

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QUESTION: 6

Which one gives the monochromatic emissive power for black body radiation ?

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QUESTION: 7

For what value of Prandtl number, St = f/2?

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QUESTION: 8

In a shell and tube heat exchanger,

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QUESTION: 9

Dietus-Boelter equation used for the determination of heat transfer co-efficient is valid

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QUESTION: 10

The equation, , corrosponds to __________ analogy.

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QUESTION: 11

For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it

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QUESTION: 12

Out of the following four assumptions used in the derivation of the equation for LMTD , which one is subject to the largest deviation in practice ?

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QUESTION: 13

Heat flux increases with temperature drop beyond the Leiden frost point in the plot of heat flux vs. temperature drop for a boiling liquid, because

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QUESTION: 14

Resistance to heat flow by conduction is proportional to (where, t & ρ are thickness & density of the material respectively and A = area normal to the direction of heat flow. )

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QUESTION: 15

Temperature profile in steady state heat transfer is

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QUESTION: 16

For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it

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QUESTION: 17

When vaporisation takes place through a blanketting film of gas, the phenomenon is termed as __________ boiling.

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QUESTION: 18

Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter)

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QUESTION: 19

Stefan-Boltzman law which describes the radiation heat transfer states that, it is proportional to (where, t = temperature in oC T = absolute temperature in oK )

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QUESTION: 20

The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is

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QUESTION: 21

What is the unit of thermal conductivity ?

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QUESTION: 22

It is desired to concentrate a 20% salt solution (20 kg of salt in 100 kg of solution) to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min at 30oC. The boiling point of the solution is 110oC, the latent heat of vaporisation is 2100 kJ/kg and the specific heat of the solution is 4 kJ/kg.K. The rate at which the heat has to be supplied in (kJ/min) to the evaporator is

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QUESTION: 23

It is not preferable to use superheated steam in evaporators, because of its very

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QUESTION: 24

The thermal radiation emitted by a body is proportional to Tn, where T is its absolute temperature. The value of 'n' is exactly 4 for

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QUESTION: 25

LMTD for counterflow and prallel flow heat exchanger will be the same, when the

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