27. The Heat transferred through wave energy (electromagnetic waves) is: A. Subl

Question

27. The Heat transferred through wave energy (electromagnetic waves) is: A. Sublimation B. Conduction C. Radiation D. Nuclear Fusion 28. During heat transfer, thermal energy always moves in the same direction: A. COLDHOT B. HOT COLD C. No movement D. HOTHOT 29. Convection depends on speed, and motion increases heat transfer by convection in some fluids only. A. TRUE B. FALSE 30. When fluid flow through a circular tube of uniform cross-suction and fully developed, The velocity distribution depend on the A. diameter. B. pressure. C. type of the flow. D. None of the above answers.

Explanation / Answer

27. Ans

option c is correct because Radiation happens when heat transferred through energy waves.

28.Ans

option B is correct because during heat transfer thermal energy always moves from high temperature to low temperature i.e from hot to cold.

29.Ans

option B is correct because motion increases heat transfer by convection in all fluids. all fluids have some heat transfer coefficients and heat transfer coefficient increases with velocity.

30.Ans

Option c is correct. when fluid flow through a circular tube of uniform cross-section and fully developed, the velocity distribution depend upon whether the flow is laminar or turbulent. if the flow is laminar then velocity profile will be parabolic if the flow is turbulent then velocity profile will be approximately flat.

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