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.Management Sciences
Category: Chemical Heat Transfer
A perfect black body is a perfect _____________ of radiation?
A. Absorber
B. Emitter
C. Both A. & B.
D. Neither A. nor B.
For a cold dilute feed to produce thick viscous liquor, backward feeding as compared to forward feeding results in_____________________?
A. Increased economy
B. Decreased economy
C. Lower capacity
D. No effect on economy
If average heat transfer co-efficient is ha and the local coefficient at the end of the plate is hl then in case of heat transfer to a fluid flowing over a flat plate, heated over its entire length________________?
A. ha = hl
B. ha = 2hl
C. ha = 0.5 hl
D. ha = 0.75 hl
Thermal conductivity of a conducting solid material depends upon its_______________?
A. Temperature
B. Porosity
C. Both A. & B.
D. Neither A. nor B.
Heat waves_____________________?
A. Cannot pass through vacuum
B. Travel in straight line
C. Can be reflected by a mirror
D. Both B. and C.
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is________________?
A. Finned tube heat exchanger with air inside and steam outside
B. Finned tube heat exchanger with air outside and steam inside
C. Shell and tube heat exchanger with air inside tubes and steam on shell side
D. Shell and tube heat exchanger with air on shell side and steam inside tubes
Unsteady state heat conduction occurs, when_______________?
A. Temperature distribution is independent of time
B. Temperature distribution is dependent on time
C. Heat flows in one direction only
D. Three dimensional heat flow is concerned
LMTD for evaporators & condensers for a given terminal parameters & set of conditions for counter-flow is equal to that for parallel flow. In such heat exchangers, with one of the fluids condensing or evaporating, the surface area required is the least in the ______________ flow?
A. Parallel
B. Mixed
C. Counter flow
D. Same in either A , B. or C.
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