A non-dimensional number which generally finds application in mass transfer problems is
A.Stanton number
B.Mach number
C.Graetz number
D.Grashoff number
E.Weber number
Category: Heat Transfer Mcqs
The emissive power of a body depends on
A.Nature of body
B.Temperature of body
C.Physical nature
D.All of the above
E.None of the above
The value of Stefan Boltzmann’s constant in kcal-m2-hr-k4 is
A.56.7 x 10-9
B.1.335 x 10-12
C.4.87 x 10-8
D.0.174 x 10-8
E.0.567 x 10-4
The diathermous body is one that ______________?
A. diffuses all the thermal rays in the different directions
B. absorbs all the thermal rays
C. negligible absorptivity but high reflectivity
D.Allows all the incident radiation to pass through it
Continue reading “The diathermous body is one that ______________?”
Hydrogen cannot be liquefied at room temperature because
A.it has low density
B.it has high specific heat
C.it is a diatomic gas
D.its critical temperature is less than the room temperature
The average value of thermal conductivity for water at 20?C is about
A.0.13
B.0.32
C.0.51
D.None of the above
The surface temperature of the sun is
A.2000?K
B.6000?K
C.20000?K
D.Millions of degrees
E.Infinitely large
A hollow sphere with uniform interior temperature and a small hole behaves very nearly as a
A.Grey body
B.White body
C.Opaque body
D.Transparent body
E.Black body
The value of thermal conductivity of water at room temperature is expected to be
A.0.001 kcal/m-hr-?C
B.0.05 kcal/m-hr-?C
C.0.5 kcal/m-hr-?C
D.1.0 kcal/m-hr-?C
E.1.5 kcal/m-hr-?C
