Related Questions

According to Kirchoff's law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a
A Grey body
B Brilliant white polished body
C Red hot body
D Black body
Kirchoff's law is applicable to
A Monochromatic radiation only
B Total radiation only
C Both A and B
D Only volumes and not to surfaces
Kirchoff s law applies to __________ radiation.
A Total
B Monochromatic
C Both A & B
D Neither A nor B
The reaction in which the rate equation corresponds to a stoichiometric equation, is called a/an __________ reaction.
A Elementary
B Non-elementary
C Parallel
D Autokinetic
The rate of reaction of a/an __________ reaction is not affected by temperature rise.
A Autocatalytic
B Photochemical
C Consecutive
D Zero order
How are the efficiencies of any heat engine (miu) and reversible heat engine (miuR) compared, when both are operating between same heat source and same heat sink?
A miu = miuR
B miu>miuR
C miu
D none of these
The scales form in heat exchanges after a period of operation and provide additional resistance to heat transfer with some heat transfer coefficient . The reciprocal of this scale heat transfer coefficient is called .
A scaling factor
B forming factor
C resisting factor
D fouling factor
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
A Surrounding temperature
B Average temperature of the fin
C Temperature of the fin end
D Constant temperature equal to that of the base
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
For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area
A Increases
B Decreases
C Remains constant
D Passes through a maxima

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