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Code No: 56020 Set No. 1JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

III B.Tech. II Sem., II Mid-Term Examinations, April 2012HEAT TRANSFERObjective Exam

Name: ______________________________ Hall Ticket No.

Answer All Questions. All Questions Carry Equal Marks.Time: 20 Min. Marks: 10.

I Choose the correct alternative:

1. The thickness of thermal and hydrodynamic boundary layer is equal than [ ]

a) Pr=1 b)Pr>1 c)Pr

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Code No: 56020 :2: Set No. 1

II Fill in the blanks

11. Water at 200C,sm

kg

.10002.1 3= ,

Kkg

kjCp

.183.4= and

Km

Wk

.603.0= then Prandtl number is

________________

12. Multiple pass heat exchangers is used ________________

13. Heat transfer in liquid and gases takes place by _____________

14. Thermal radiation extends over the range of _______________

15. When there is a flow of fluid over a flat plate of length l, the average heat transfer coefficient is

________________

16. Plancks law holds good for _____________

17. The value of logarithmic mean temperature for counter-flow heat exchanger as compared to

parallel flow exchanger is___________

18. The ratio of the energy absorbed by the body to total energy falling on it is called as ___________

19. The rate of heat transfer from a solid surface to a fluid is obtained from_____________

20. The heat transfer takes place according to ___________law of thermodynamics

-oOo-

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Code No: 56020 Set No. 2JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

III B.Tech. II Sem., II Mid-Term Examinations, April 2012HEAT TRANSFERObjective Exam

Name: ______________________________ Hall Ticket No.

Answer All Questions. All Questions Carry Equal Marks.Time: 20 Min. Marks: 10.

I Choose the correct alternative:

1. Dropwise condensation usually occurs on [ ]

a) Glazed surface b) smooth surface c) oil surface d) coated surface

2. The ratio of surface convection resistance to internal conduction resistance is [ ]

a) Granshoff number b)Biot number c) Stanton number d)Prandtl number

3. The burnout heat flux in the nucleate boiling regime is a function of [ ]a) Heat of evaporation b) Density of vapour and Density of liquid

c)Vapour-liquid surface tension d) All

4. The ratio of energy transferred by convection of that by conduction is called [ ]

a) Stanton number b)nusselt number c) biot number d)preclet number

5. In a parallel flow gas turbine recuperator, the maximum effectiveness is [ ]

a) 100% b) 75% c) 50% d)< 50%

6. In a shell and tube heat exchanger, baffles are provided on the shell side to [ ]

a) Prevent the stagnation of shell side fluid b) improve heat transferc) Provide support for tubes d) All

7. Suns surface at 5800 K emits radiation at a wavelength of 0.5. A furnace at 300

0C will emit

through a small opening, radiation at a wavelength of nearly [ ]

a) 10 b) 5 c) 0.25 d) 0.025

8. The thickness of thermal and hydrodynamic boundary layer is equal than [ ]a) Pr=1 b)Pr>1 c)Pr

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Code No: 56020 :2: Set No. 2

II Fill in the blanks

11. Thermal radiation extends over the range of _______________

12. When there is a flow of fluid over a flat plate of length l, the average heat transfer coefficient is

________________

13. Plancks law holds good for _____________

14. The value of logarithmic mean temperature for counter-flow heat exchanger as compared to

parallel flow exchanger is___________

15. The ratio of the energy absorbed by the body to total energy falling on it is called as ___________

16. The rate of heat transfer from a solid surface to a fluid is obtained from_____________

17. The heat transfer takes place according to ___________law of thermodynamics

18. Water at 200C,sm

kg

.10002.1 3= ,

Kkg

kjCp

.183.4= and

Km

Wk

.603.0= then Prandtl number is

________________

19. Multiple pass heat exchangers is used ________________

20. Heat transfer in liquid and gases takes place by _____________

-oOo-

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Code No: 56020 Set No. 3JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

III B.Tech. II Sem., II Mid-Term Examinations, April 2012HEAT TRANSFERObjective Exam

Name: ______________________________ Hall Ticket No.

Answer All Questions. All Questions Carry Equal Marks.Time: 20 Min. Marks: 10.

I Choose the correct alternative:

1. The burnout heat flux in the nucleate boiling regime is a function of [ ]

a) Heat of evaporation b) Density of vapour and Density of liquid

c)Vapour-liquid surface tension d) All

2. The ratio of energy transferred by convection of that by conduction is called [ ]

a) Stanton number b)nusselt number c) biot number d)preclet number

3. In a parallel flow gas turbine recuperator, the maximum effectiveness is [ ]

a) 100% b) 75% c) 50% d)< 50%

4. In a shell and tube heat exchanger, baffles are provided on the shell side to [ ]

a) Prevent the stagnation of shell side fluid b) improve heat transferc) Provide support for tubes d) All

5. Suns surface at 5800 K emits radiation at a wavelength of 0.5. A furnace at 300

0C will emit

through a small opening, radiation at a wavelength of nearly [ ]

a) 10 b) 5 c) 0.25 d) 0.025

6. The thickness of thermal and hydrodynamic boundary layer is equal than [ ]a) Pr=1 b)Pr>1 c)Pr

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Code No: 56020 :2: Set No. 3

II Fill in the blanks

11. Plancks law holds good for _____________

12. The value of logarithmic mean temperature for counter-flow heat exchanger as compared to

parallel flow exchanger is___________

13. The ratio of the energy absorbed by the body to total energy falling on it is called as ___________

14. The rate of heat transfer from a solid surface to a fluid is obtained from_____________

15. The heat transfer takes place according to ___________law of thermodynamics

16. Water at 200C, sm

kg

.10002.13

= , Kkg

kj

Cp .183.4= and Km

W

k .603.0= then Prandtl number is

________________

17. Multiple pass heat exchangers is used ________________

18. Heat transfer in liquid and gases takes place by _____________

19. Thermal radiation extends over the range of _______________

20. When there is a flow of fluid over a flat plate of length l, the average heat transfer coefficient is

________________

-oOo-

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Code No: 56020 Set No. 4JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

III B.Tech. II Sem., II Mid-Term Examinations, April 2012HEAT TRANSFERObjective Exam

Name: ______________________________ Hall Ticket No.

Answer All Questions. All Questions Carry Equal Marks.Time: 20 Min. Marks: 10.

I Choose the correct alternative:

1. In a parallel flow gas turbine recuperator, the maximum effectiveness is [ ]

a) 100% b) 75% c) 50% d)< 50%

2. In a shell and tube heat exchanger, baffles are provided on the shell side to [ ]

a) Prevent the stagnation of shell side fluid b) improve heat transfer

c) Provide support for tubes d) All

3. Suns surface at 5800

K emits radiation at a wavelength of 0.5. A furnace at 3000

C will emitthrough a small opening, radiation at a wavelength of nearly [ ]

a) 10 b) 5 c) 0.25 d) 0.025

4. The thickness of thermal and hydrodynamic boundary layer is equal than [ ]

a) Pr=1 b)Pr>1 c)Pr

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Code No: 56020 :2: Set No. 4

II Fill in the blanks

11. The ratio of the energy absorbed by the body to total energy falling on it is called as ___________

12. The rate of heat transfer from a solid surface to a fluid is obtained from_____________

13. The heat transfer takes place according to ___________law of thermodynamics

14. Water at 200C,sm

kg

.10002.1 3= ,

Kkg

kjCp

.183.4= and

Km

Wk

.603.0= then Prandtl number is

________________

15. Multiple pass heat exchangers is used ________________

16. Heat transfer in liquid and gases takes place by _____________

17. Thermal radiation extends over the range of _______________

18. When there is a flow of fluid over a flat plate of length l, the average heat transfer coefficient is

________________

19. Plancks law holds good for _____________

20. The value of logarithmic mean temperature for counter-flow heat exchanger as compared toparallel flow exchanger is___________

-oOo-

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