48. In Engineering Heat transfer studies, the experimental approach has the adva

Question

48. In Engineering Heat transfer studies, the experimental approach has the advantage that we deal with the actual physical system, and the desired quantity is determined by measurement, within the limits of experimental error. However, this approach is expensive, time consuming, and often impractical. A. TRUE B. FALSE 49. This motion is associated by mechanical means such as pumps, gravity or fans, to produce the movement of the fluid: A. Free convection B. Forced conduction C. Forced convection D. Radiation INDOORS 50. As per the following picture: Hot objects in a cooler room will cool to room temperature while, Cold objects in a warmer room will remain cold in the room A. TRUE B. FALSE

Explanation / Answer

48.Ans

option a is correct. The experimental approach is time-consuming, expensive and often impossible.let say we are taking a system under consideration, that system may exist or may not be existing at the design stage. The system may contain hazardous substances and hence measurement approach will not be practical at all.

49.Ans

The answer is forced convection because, In Forced convection heat transfer, fluids are forced to move, in order to increase the heat transfer with the help of a ceiling fan, a pump, suction device, gravity or due to other means.

50.Ans

option B is correct. this is false because heat always transfers from a hot system to cold system and then after a period of time both systems will attain the same temperature. when hot object is in a cooler room then heat will transfer from hot object to cooler room and when cold object is in warmer room then heat will transfer from warmer room to cold objects.

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