Thermal diffusivity is the most important in heat transfer by__________________?
A. Conduction
B. Radiation
C. Condensation
D. Natural convection
Chemical Heat Transfer
LMTD correction factor which is to be applied for a cross-flow heat exchanger increases with increase in the number of shell passes. Its value for a single pass cross flow heat exchanger is __________________?
LMTD correction factor which is to be applied for a cross-flow heat exchanger increases with increase in the number of shell passes. Its value for a single pass cross flow heat exchanger is __________________?
A. 0
B. 1
C. > 1
D. < 1
The statement that “maximum wavelength of radiation is inversely proportional to the temperature” is ______________ law?
The statement that “maximum wavelength of radiation is inversely proportional to the temperature” is ______________ law?
A. Stefan-Boltzmann’s
B. Planck’s
C. Wien’s displacement
D. None of these
Among liquids, water has a comparatively high value of thermal conductivity, due to its__________________?
Among liquids, water has a comparatively high value of thermal conductivity, due to its__________________?
A. Low density
B. High viscosity
C. Partial ionisation
D. Dense structure
In which mode of heat transfer, the Biot number is important ?
In which mode of heat transfer, the Biot number is important ?
A. Transient heat conduction
B. Natural convection
C. Forced convection
D. Radiation
A diathermanous substance _______________ the thermal radiation completely?
A diathermanous substance _______________ the thermal radiation completely?
A. Absorbs
B. Reflects
C. Transmits
D. None of these
Boiling point elevation of a solution of NaOH _____________________?
Boiling point elevation of a solution of NaOH _____________________?
A. Increases rapidly with temperature rise
B. Is almost independent of temperature
C. Is almost independent of pressure
D. Both B. and C
Radiant energy received by a body is proportional to (where, d = the distance between the object emitting radiation and that receiving it.) ?
Radiant energy received by a body is proportional to (where, d = the distance between the object emitting radiation and that receiving it.) ?
A. √d
B. d
C. d2
D. d1.5
Overall thermal resistance for conductive heat transfer through a series of flat resistances is equal to the____________________?
Overall thermal resistance for conductive heat transfer through a series of flat resistances is equal to the____________________?
A. Maximum resistance in the series
B. Sum of all resistances
C. Average of all resistances
D. Minimum resistance presents in the series
Prandtl and Reynolds analogy are same, when Prandtl number is____________________?
Prandtl and Reynolds analogy are same, when Prandtl number is____________________?
A. 0.5
B. 1
C. > 2
D. 1.5