A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case ?

Chemical Heat Transfer 29/01/2021

A. The cooling rate will be the same for the two spheres and hence the two spheres will have
equal temperatures at any instant
B. Both the spheres will emit equal amount of radiation per unit time in the beginning
C. Both will absorb equal amount of radiation from the surrounding in the beginning
D. Both B. & C.

Related Mcqs:

    LMTD can’t be used as such without a correction factor for the_________________?
    A. Multipass heat exchanger B. Baffled heat exchanger C. Condensation of mixed vapour in a condenser D. All A. B. and C....
    In case of heat transfer by conduction in a hollow cylinder, ______________ mean area is used to calculate the heat transfer rate?
    A. Geometric B. Arithmetic C. Logarithmic D. Either A., B. or C....
    In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will___________________?
    A. Increase B. Decrease C. Remain unchanged D. Either increase or decrease; depends on the coolant flow rate...
    The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is__________________?
    A. 2.36 B. 4.36 C. 120.36 D. Dependent on NRe only...
    The unit of heat transfer co-efficient is_________________?
    A. BTU/hr. ft2°F B. BTU/hr. °F. ft C. BTU/hr. °F D. BTU/hr. ft...

Leave a Reply

Your email address will not be published. Required fields are marked *