TasDia Network
TasDia Network

MCQs 1: Which of the following is NOT a type of heat exchanger?

Recuperator Regenerator Mixer none of the above
Answer Explanation

MCQs 2: The two fluids are not mixed and kept separated as they both flow through heat exchanger in

Transfer type heat exchanger or recuperator Storage type heat exchanger or regenerator Direct contact type heat exchanger or mixer none of the above
Answer Explanation

MCQs 3: Which of the following is/are example/s of direct contact type heat exchanger?

jet condenser desuperheater cooling tower all of the above
Answer Explanation

MCQs 4: What is the reason behind the fact that the thermal resistance of hollow cylinder for convection decreases with increase in the thickness of the insulation?

volume of insulating material increases and it transfer less heat energy increase in surface area of the cylinder leads to less convective heat transfer increase in surface area of the cylinder leads to more convective heat transfer none of the above
Answer Explanation

MCQs 5: What is the critical thickness of insulation for hollow cylinder?

a thickness of insulation at which heat transfer rate from cylinder is minimum a thickness of insulation at which heat transfer rate from cylinder is maximum a thickness of insulation at which heat transfer from cylinder does not change with change in outside temperature none of the above
Answer Explanation

MCQs 6: When the thickness of an insulation is greater than the critical thickness of insulation, then the heat transfer rate of insulated pipe

will be more than the heat transfer rate from the same pipe without insulation will be less than the heat transfer rate from the same pipe without insulation will become equal to the heat transfer rate from the same pipe without insulation none of the above
Answer Explanation

MCQs 7: When the thickness of insulation is less than the critical thickness of the insulation, then the heat transfer rate of insulated pipe

will be more than the heat transfer rate from the same pipe without insulation will be less than the heat transfer rate from the same pipe without insulation will become equal to the heat transfer rate from the same pipe without insulation none of the above
Answer Explanation

MCQs 8: What is the advantage of using the spherical vessel to store fluids at low temperature?

heat transfer in sphere is restricted in all direction by insulation sphere has the smallest volume per unit surface area sphere has the largest volume per unit surface area none of the above
Answer Explanation

MCQs 9: At the critical radius of insulation of a hollow sphere, the heat transfer will be

minimum maximum does not change unpredictable
Answer Explanation

MCQs 10: The buoyancy forces which give rise to the natural convection are called as

convection forces fluid forces body forces none of the above
Answer Explanation

MCQs 11: The intensity of mixing of fluid in natural convection is

more than the intensity of mixing of fluid in forced convection less than the intensity of mixing of fluid in forced convection equal to the intensity of mixing of fluid in forced convection unpredictable
Answer Explanation

MCQs 12: What is the relation between convection heat transfer coefficients of natural convection and forced convection?

convection heat transfer coefficient of natural convection is lower than the convection heat transfer coefficient of forced convection convection heat transfer coefficient of natural convection is more than the convection heat transfer coefficient of forced convection convection heat transfer coefficients in both natural and forced convection are the same for same system unpredictable
Answer Explanation

MCQs 13: Assume a natural convection heat transfer on a vertical flat plate surrounded by a fluid. Where will be the fully developed turbulent layer of fluid established, if the plate is hotter than the fluid?

At the bottom of the plate At the middle of the plate At the top of the plate Nowhere
Answer Explanation

MCQs 14: Assume fluid flowing in a tube forcefully. The velocity boundary layer develops along the tube. Thickness of this boundary layer increases in the flow direction until the boundary layer reaches the tube centre. This region from the tube inlet to the point at which the boundary layers merge at the centerline is called as

laminar entry region hydraulic entry region hydrostatic entry region hydrodynamic entry region
Answer Explanation

MCQs 15: What is hydro-dynamically developed region in fluid flowing inside a pipe?

a region where velocity profile of the fluid is partially developed a region where velocity profile of the fluid is fully developed a region where velocity profile of the fluid changes according to the distance none of the above
Answer Explanation

MCQs 16: What is the ratio of the buoyancy force to the viscous force acting on a fluid called?

Prandtl number (Pr) Reynolds number (Re) Nusselt number (Nu) Grashof number (Gr)
Answer Explanation

MCQs 17: In natural convection, the Nusselt number (Nu) depends on

Pr and Re Gr and Re Gr and Pr none of the above
Answer Explanation

MCQs 18: The total radiation leaving a surface per unit time per unit surface area is called as

radiosity irradiosity irradiation none of the above
Answer Explanation

MCQs 19: Radiosity (J) is the sum of radiation

emitted, reflected and absorbed emitted, reflected and transmitted transmitted, reflected and absorbed none of the above
Answer Explanation

MCQs 20: Radiation shields are used

to increase radiant heat transfer to decrease radiant heat transfer to maintain radiant heat transfer constant none of the above
Answer Explanation

Related Topics

About Us | Contact Us | Privacy Policy
ABOUT US
Category
Who We Are

TasDia Network, this platform not only provides you the best educational stuff but besides this, we are creating thousands of new ideas to making your signature and planning much more on a single platform.

© 2020-2023, TasDia Network

All rights of the publication are reserved by tasdia.com.