Heat Transfer MCQ Questions & Answers

11

The advantage of using a 1 - 2 shell and tube heat exchanger over a 1 - 1 shell and tube heat exchanger is

A) Lower tube side pressure drop B) Lower shell side pressure drop C) Higher tube side heat transfer co-efficient D) Higher shell side heat transfer co-efficient

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Answer & Solution

Answer: Option C

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12

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

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

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Answer & Solution

Answer: Option C

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13

Nusselt number is the ratio of the

A) Temperature gradient of the wall to that across the entire pipe B) Temperature difference to the temperature gradient at the wall C) Heat flux at the wall to that across the entire pipe D) None of these

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Answer & Solution

Answer: Option C

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14

Which of the following accessories is provided in the vapor line of an evaporator for removing the entrained liquid?

A) Bleed point B) Vent C) Catchall D) Baffle

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Answer & Solution

Answer: Option C

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15

Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for

A) Cube B) Cylinder C) Sphere D) Equal for all the three

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Answer & Solution

Answer: Option A

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16

In Joule's experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms^-2. Neglecting the heat capacity of agitator, the temperature of water (in °C) is

A) 40.5 B) 34.4 C) 26.8 D) 25

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Answer & Solution

Answer: Option B

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17

The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is

A) 1.66 B) 88.66 C) 3.66 D) Dependent on N_Re only

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Answer & Solution

Answer: Option C

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18

The statement that "maximum wavelength of radiation is inversly proportional to the temperature" is __________ law.

A) Stefan-Boltzman's B) Planck's C) Wien's displacement D) None of these

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Answer & Solution

Answer: Option C

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19

Log mean temperature difference (LMTD) cannot be used, if

A) Heat transfer co-efficient over the entire heat exchanger is not constant B) There exists an unsteady state C) The heat capacity is not constant and there is a phase change D) None of these

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Answer & Solution

Answer: Option D

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20

Multiple effect evaporation is generally recommended, when the

A) Large scale evaporation of liquor is needed B) Corrosive liquids are to be concentrated C) Fuel is cheaply available D) Evaporation on small scale is to be done

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Answer & Solution

Answer: Option A

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Heat Transfer MCQ Questions & Answers | Chemical Engineering