Question 1

An equipment which converts the latent or sensible heat of one fluid into the latent heat of vaporisation of another, is called a

Accepted Answer

A) Boiler 
B) Heat exchanger 
C) Recuperator 
D) Regenerator 
A) Boiler 
B) Heat exchanger 
C) Recuperator 
D) Regenerator B

Question 2

Tube expansion allowances exist in __________ heat exchanger.

Accepted Answer

A) Multipass fixed tube sheet 
B) U-tube 
C) Single pass fixed tube sheet 
D) None of these 
A) Multipass fixed tube sheet 
B) U-tube 
C) Single pass fixed tube sheet 
D) None of these B

Question 3

The purpose of providing expansion bellows in the shell of tubular exchanger is to

Accepted Answer

A) Increase the heating load 
B) Impart structural strength 
C) Account for the uneven expansion of shell and tube bundles 
D) Facilitate increase of shell length, if needed 
A) Increase the heating load 
B) Impart structural strength 
C) Account for the uneven expansion of shell and tube bundles 
D) Facilitate increase of shell length, if needed C

Question 4

Which has the lowest Prandtl number?

Accepted Answer

A) Liquid metal 
B) Aqueous solution 
C) Water 
D) Lube oil 
A) Liquid metal 
B) Aqueous solution 
C) Water 
D) Lube oil

Question 5

Multiple effect evaporation accounts for

Accepted Answer

A) Steam economy 
B) Lower operating costs 
C) Investment economy 
D) None of these 
A) Steam economy 
B) Lower operating costs 
C) Investment economy 
D) None of these

Question 6

The average heat transfer co-efficient over the entire length of the plate (ha) and the local heat transfer co-efficient (hL), in case of heat transfer over a flat plate in laminar zone is related as

Accepted Answer

A) ha = 0.8hL 
B) ha = 2hL 
C) ha = hL 
D) ha = 5hL 
A) ha = 0.8hL 
B) ha = 2hL 
C) ha = hL 
D) ha = 5hL

Question 7

What is the geometric mean of two heat transfer areas A1 and A2?

Accepted Answer

A) ?(A1 . A2) 
B) ?(A1 + A2) 
C) ½ ?(A1 . A2) 
D) 2 ?(A1 . A2) 
A) ?(A1 . A2) 
B) ?(A1 + A2) 
C) ½ ?(A1 . A2) 
D) 2 ?(A1 . A2)

Question 8

Prandtl number for most of dry gases is about

Accepted Answer

A) 0.001 
B) 0.72 
C) 70 
D) 150 
A) 0.001 
B) 0.72 
C) 70 
D) 150

Question 9

Fruit juice (a heat sensitive material) can be concentrated in a __________ evaporator.

Accepted Answer

A) Long tube 
B) Falling film 
C) High pressure 
D) None of these 
A) Long tube 
B) Falling film 
C) High pressure 
D) None of these

Question 10

A black body does not __________ radiation.

Accepted Answer

A) Absorb or emit 
B) Refract 
C) Reflect 
D) Both (
B)  & (
C)  
A) Absorb or emit 
B) Refract 
C) Reflect 
D) Both (
B)  & (
C)

Question 11

Boiling point of a solution according to Duhring's rule is a linear function of the __________ of water.

Accepted Answer

A) Boiling point (at the same pressure) 
B) Viscosity 
C) Density 
D) Thermal conductivity 
A) Boiling point (at the same pressure) 
B) Viscosity 
C) Density 
D) Thermal conductivity

Question 12

Boiling point elevation for a strong and concentrated solution is found by Duhring's rule, which states that at the same pressure, the boiling point of a solution is a linear function of the __________ of pure water.

Accepted Answer

A) Boiling point 
B) Dynamic viscosity 
C) Kinematic viscosity 
D) Density 
A) Boiling point 
B) Dynamic viscosity 
C) Kinematic viscosity 
D) Density

Question 13

The ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is

Accepted Answer

A) 2 
B) 1/2 
C) 4 
D) 1/4 
A) 2 
B) 1/2 
C) 4 
D) 1/4

Question 14

The equation, (NSt × N 2/3 Pr) = f/2, is the __________ analogy.

Accepted Answer

A) Colburn 
B) Reynolds 
C) Prandtl 
D) None of these 
A) Colburn 
B) Reynolds 
C) Prandtl 
D) None of these

Question 15

Sensible heat absorbed by 1 lb of water when it is heated from 32 to 212°F may be around __________ BTU.

Accepted Answer

A) 180 
B) 970 
C) 3.97 
D) Data insufficient, can't be predicted 
A) 180 
B) 970 
C) 3.97 
D) Data insufficient, can't be predicted

Question 16

The range of electromagnetic spectrum important in heat transfer by radiation is __________ microns.

Accepted Answer

A) 0.38-0.78 
B) 0.5-50 
C) 100-1000 
D) 5-50 
A) 0.38-0.78 
B) 0.5-50 
C) 100-1000 
D) 5-50

Question 17

Multipass heat exchangers are used

Accepted Answer

A) Because of simplicity of fabrication 
B) For low heat load 
C) To obtain higher heat transfer co-efficient and shorter tube 
D) To reduce the pressure drop 
A) Because of simplicity of fabrication 
B) For low heat load 
C) To obtain higher heat transfer co-efficient and shorter tube 
D) To reduce the pressure drop

Question 18

Fresh orange juice contains 12% (by weight) solids and the rest water 90% of the fresh juice is sent to an evaporator to remove water and subsequently mixed with the remaining 10% of fresh juice. The resultant product contains 40% solids. The kg of water removed from 1 kg fresh juice is

Accepted Answer

A) 0.4 
B) 0.5 
C) 0.6 
D) 0.7 
A) 0.4 
B) 0.5 
C) 0.6 
D) 0.7

Question 19

Extremely large or small volumes of fluids are generally best routed through the shell side of a shell and tube heat exchanger, because of the

Accepted Answer

A) Less corrosion problems 
B) Flexibility possible in the baffle arrangement 
C) Low pressure drop 
D) High heat transfer co-efficient 
A) Less corrosion problems 
B) Flexibility possible in the baffle arrangement 
C) Low pressure drop 
D) High heat transfer co-efficient

Question 20

Stefan-Boltzmann law which describes the radiation heat transfer states that, it is proportional to (where, t = temperature in °C T = absolute temperature in ° K)

Accepted Answer

A) t4 
B) T4 
C) 1/t4 
D) 1/T4 
A) t4 
B) T4 
C) 1/t4 
D) 1/T4

Exam 22: Heat Transfer and Boiling Point Elevation in Solutions

An equipment which converts the latent or sensible heat of one fluid into the latent heat of vaporisation of another, is called a

Tube expansion allowances exist in __________ heat exchanger.

The purpose of providing expansion bellows in the shell of tubular exchanger is to

Which has the lowest Prandtl number?

Multiple effect evaporation accounts for

The average heat transfer co-efficient over the entire length of the plate (ha) and the local heat transfer co-efficient (hL), in case of heat transfer over a flat plate in laminar zone is related as

What is the geometric mean of two heat transfer areas A1 and A2?

Prandtl number for most of dry gases is about

Fruit juice (a heat sensitive material) can be concentrated in a __________ evaporator.

A black body does not __________ radiation.

Boiling point of a solution according to Duhring's rule is a linear function of the __________ of water.

Boiling point elevation for a strong and concentrated solution is found by Duhring's rule, which states that at the same pressure, the boiling point of a solution is a linear function of the __________ of pure water.

The ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is

The equation, (NSt × N 2/3 Pr) = f/2, is the __________ analogy.

Sensible heat absorbed by 1 lb of water when it is heated from 32 to 212°F may be around __________ BTU.

The range of electromagnetic spectrum important in heat transfer by radiation is __________ microns.

Multipass heat exchangers are used

Fresh orange juice contains 12% (by weight) solids and the rest water 90% of the fresh juice is sent to an evaporator to remove water and subsequently mixed with the remaining 10% of fresh juice. The resultant product contains 40% solids. The kg of water removed from 1 kg fresh juice is

Extremely large or small volumes of fluids are generally best routed through the shell side of a shell and tube heat exchanger, because of the

Stefan-Boltzmann law which describes the radiation heat transfer states that, it is proportional to (where, t = temperature in °C T = absolute temperature in ° K)

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