Gas to particle heat transfer coefficients can be calculated by the equation given below, which one is correct for Re/ < 200.

Nu=1.6 10-2 (( frac{Re}{ in})^{1.3} Pr^ frac{2}{3} )

Nu=1.6 10-2 (( frac{Re}{ in})^{1.3} ) Pr0.33

Nu=1.6 10-2 (( frac{Re}{ in})^{1.3} Pr^ frac{2}{3} )

Nu=1.6 10-2 (( frac{Re}{ in})^ frac{2}{3} ) Pr0.33

Nu=0.4 (( frac{Re}{ in})^ frac{2}{3} ) Pr0.33

On complete fluidisation, which one of the following is zero?

Heat transfer between the fluidized bed particles and the larger particles floating in the bed

Heat transfer between different points in the bed

Heat transfer between the fluidized bed particles and the larger particles floating in the bed

Heat transfer to the submerged surfaces in contact with the bed

Which one of the heat transfer processes are not involved in a fluidised bed?

Heat transfer between different points in the bed

Heat transfer between the fluidized bed particles and the larger particles floating in the bed

Heat transfer to the submerged surfaces in contact with the bed

Which one of the following method is the most reliable when it comes to determine fluidisation point?

Top surface particles starting random movement

Half of the particles getting free

What happens at velocities above the transport velocity?

Particles break into smaller parts

Particles are carried out of the system by the fluid

Particles break into smaller parts

Particles accumulate at the top

13 + Mcqs in Fluidised Beds Heat Transfer Coefficients in Heat Transfer Operations Page 1 McqOptions

1.	Heat transfer between the active particle and the fluidized bed is controlled by three mechanisms given below, identify the wrong entry.
A.	Radiation
B.	Gas convection
C.	Particle convection
D.	Particle conduction
Answer» E.

Discussion

2.	Active particles which are quite large sternly repel the emulsion phase and hence the mass transfer rate augments with the ________ of the inert bed material size and _________ with increase of its active particle s diameter.
A.	Increase, Decrease
B.	Increase, Increase
C.	Decrease, Increase
D.	Decrease, Decrease
Answer» B. Increase, Increase

Discussion

3.	Gas to particle heat transfer coefficients can be calculated by the equation given below, which one is correct for Re/ < 200.
A.	Nu=1.6 10<sup>-2</sup> (( frac{Re}{ in})^{1.3} ) Pr<sup>0.33</sup>
B.	Nu=1.6 10<sup>-2</sup> (( frac{Re}{ in})^{1.3} Pr^ frac{2}{3} )
C.	Nu=1.6 10<sup>-2</sup> (( frac{Re}{ in})^ frac{2}{3} ) Pr<sup>0.33</sup>
D.	Nu=0.4 (( frac{Re}{ in})^ frac{2}{3} ) Pr<sup>0.33</sup>
Answer» B. Nu=1.6 10<sup>-2</sup> (( frac{Re}{ in})^{1.3} Pr^ frac{2}{3} )

Discussion

4.	If there are 1000 pellets of 3mm diameter, what is the heat transfer area?
A.	0.02m<sup>2</sup>
B.	0.05m<sup>2</sup>
C.	0.04m<sup>2</sup>
D.	0.03m<sup>2</sup>
Answer» E.

Discussion

5.	On complete fluidisation, which one of the following is zero?
A.	Gas-particle heat transfer
B.	Heat transfer between different points in the bed
C.	Heat transfer between the fluidized bed particles and the larger particles floating in the bed
D.	Heat transfer to the submerged surfaces in contact with the bed
Answer» C. Heat transfer between the fluidized bed particles and the larger particles floating in the bed

Discussion

6.	Which one of the heat transfer processes are not involved in a fluidised bed?
A.	Gas-wall heat transfer
B.	Heat transfer between different points in the bed
C.	Heat transfer between the fluidized bed particles and the larger particles floating in the bed
D.	Heat transfer to the submerged surfaces in contact with the bed
Answer» B. Heat transfer between different points in the bed

Discussion

7.	If the operation on a fluidised bed is a dense flowing fixed bed, then which one of the following method is used for pressure drop calculation?
A.	Sieder Tate Equation
B.	Ergun Equation
C.	DeMentic Equation
D.	Kozeny Carman Equation
Answer» C. DeMentic Equation

Discussion

8.	What is the correct expression for pressure drop in a fluidised bed at fluidisation?
A.	P=(1- )( <sub>P</sub>- <sub>g</sub>)gH<sub>B</sub>
B.	P=( )( <sub>P</sub>- <sub>g</sub>)gH<sub>B</sub>
C.	P=(1- )( <sub>P</sub>- <sub>g</sub>)gH<sub>C</sub>
D.	P=(1- )( <sub>P</sub>)gH<sub>B</sub>
Answer» B. P=( )( <sub>P</sub>- <sub>g</sub>)gH<sub>B</sub>

Discussion

9.	Which one of the following method is the most reliable when it comes to determine fluidisation point?
A.	Pressure Drop
B.	Top surface particles starting random movement
C.	Half of the particles getting free
D.	All particles are free
Answer» B. Top surface particles starting random movement

Discussion

10.	Which one of the following working model is best suited for fluidized bed combustion boilers?
A.	Bubbling fluidized beds
B.	Laminar film fluidised bed
C.	Pneumatic conveying regime
D.	Moving bed (Dense flow)
Answer» B. Laminar film fluidised bed

Discussion

11.	What happens at velocities above the transport velocity?
A.	Particles coagulate
B.	Particles are carried out of the system by the fluid
C.	Particles break into smaller parts
D.	Particles accumulate at the top
Answer» C. Particles break into smaller parts

Discussion

12.	The maximum velocity of the turbulent regime is called the ___________ at which the fast fluidization regime occurs.
A.	Terminal velocity
B.	Transport velocity
C.	Superficial velocity
D.	Average velocity
Answer» C. Superficial velocity

Discussion

13.	Which one of the following diagrams is the correct representation of pressure drop in fluidised bed?
A.	<a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/tricky-heat-transfer-operations-questions-answers-q1a.png"><img alt="The diagrams is correct representation of pressure drop in fluidised bed - option a" class="alignnone size-full wp-image-249827" height="303" sizes="(max-width: 344px) 100vw, 344px" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/tricky-heat-transfer-operations-questions-answers-q1a.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/10/tricky-heat-transfer-operations-questions-answers-q1a.png 344w, https://www.sanfoundry.com/wp-content/uploads/2019/10/tricky-heat-transfer-operations-questions-answers-q1a-300x264.png 300w" width="344"/></a>
B.	<a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-heat-transfer-coefficients-q1b.png"><img alt="The diagrams is correct representation of pressure drop in fluidised bed - option b" class="alignnone size-full wp-image-247985" height="299" sizes="(max-width: 354px) 100vw, 354px" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-heat-transfer-coefficients-q1b.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-heat-transfer-coefficients-q1b.png 354w, https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-heat-transfer-coefficients-q1b-300x253.png 300w" width="354"/></a>
C.	<a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-heat-transfer-coefficients-q1c.png"><img alt="The diagrams is correct representation of pressure drop in fluidised bed - option c" class="alignnone size-full wp-image-247986" height="299" sizes="(max-width: 354px) 100vw, 354px" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-heat-transfer-coefficients-q1c.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-heat-transfer-coefficients-q1c.png 354w, https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-heat-transfer-coefficients-q1c-300x253.png 300w" width="354"/></a>
D.	<a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-heat-transfer-coefficients-q1d.png"><img alt="The diagrams is correct representation of pressure drop in fluidised bed - option d" class="alignnone size-full wp-image-247987" height="301" sizes="(max-width: 347px) 100vw, 347px" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-heat-transfer-coefficients-q1d.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-heat-transfer-coefficients-q1d.png 347w, https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-heat-transfer-coefficients-q1d-300x260.png 300w" width="347"/></a>
Answer» B. <a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-heat-transfer-coefficients-q1b.png"><img alt="The diagrams is correct representation of pressure drop in fluidised bed - option b" class="alignnone size-full wp-image-247985" height="299" sizes="(max-width: 354px) 100vw, 354px" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-heat-transfer-coefficients-q1b.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-heat-transfer-coefficients-q1b.png 354w, https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-heat-transfer-coefficients-q1b-300x253.png 300w" width="354"/></a>

Discussion

Explore topic-wise MCQs in Heat Transfer Operations.

Heat transfer between the active particle and the fluidized bed is controlled by three mechanisms given below, identify the wrong entry.

Active particles which are quite large sternly repel the emulsion phase and hence the mass transfer rate augments with the of the inert bed material size and _ with increase of its active particle s diameter.

Gas to particle heat transfer coefficients can be calculated by the equation given below, which one is correct for Re/ < 200.

If there are 1000 pellets of 3mm diameter, what is the heat transfer area?

On complete fluidisation, which one of the following is zero?

Which one of the heat transfer processes are not involved in a fluidised bed?

If the operation on a fluidised bed is a dense flowing fixed bed, then which one of the following method is used for pressure drop calculation?

What is the correct expression for pressure drop in a fluidised bed at fluidisation?

Which one of the following method is the most reliable when it comes to determine fluidisation point?

Which one of the following working model is best suited for fluidized bed combustion boilers?

What happens at velocities above the transport velocity?

The maximum velocity of the turbulent regime is called the ___________ at which the fast fluidization regime occurs.

Which one of the following diagrams is the correct representation of pressure drop in fluidised bed?

Explore topic-wise MCQs in Heat Transfer Operations.

Heat transfer between the active particle and the fluidized bed is controlled by three mechanisms given below, identify the wrong entry.

Active particles which are quite large sternly repel the emulsion phase and hence the mass transfer rate augments with the ________ of the inert bed material size and _________ with increase of its active particle s diameter.

Gas to particle heat transfer coefficients can be calculated by the equation given below, which one is correct for Re/ < 200.

If there are 1000 pellets of 3mm diameter, what is the heat transfer area?

On complete fluidisation, which one of the following is zero?

Which one of the heat transfer processes are not involved in a fluidised bed?

If the operation on a fluidised bed is a dense flowing fixed bed, then which one of the following method is used for pressure drop calculation?

What is the correct expression for pressure drop in a fluidised bed at fluidisation?

Which one of the following method is the most reliable when it comes to determine fluidisation point?

Which one of the following working model is best suited for fluidized bed combustion boilers?

What happens at velocities above the transport velocity?

The maximum velocity of the turbulent regime is called the ___________ at which the fast fluidization regime occurs.

Which one of the following diagrams is the correct representation of pressure drop in fluidised bed?

Active particles which are quite large sternly repel the emulsion phase and hence the mass transfer rate augments with the of the inert bed material size and _ with increase of its active particle s diameter.