Thermal diffusivity is least for
A.Rubber
B.Lead
C.Aluminium
D.Iron
E.Mercury
Category: Heat Transfer Mcqs
Calorific value of Indian coal is
A.2000 kcal/kg
B.3300 kcal/kg
C.5700 kcal/kg
D.9600 kcal/kg
The quantity of heat required to change the temperature of 1 gm of ice from -6?C to -5?C is known as
A.Latent heat of freezing
B.Specific heat
C.Heat of vaporization
D.Cold heat
E.Freezing heat
Cork is a good insulator because
A.Its density is low
B.It is porous
C.It can be powdered
D.It can be cast into rolls
E.It is flexible
A fur coat on an animal will help the animal to be
A.Warm in summer
B.Cool in summer
C.Warm in winter
D.Cool in winter
E.Safe in rains
Plank’s law of radiation is applicable to
A.Radiation of any kind
B.Temperature radiation
C.Monochromatic radiation
D.Thermal radiation
E.None of the above
Thermal conductivity of wood least depends on
A.Moisture
B.Density
C.Temperature
D.Grain orientation
E.All of the above
Which dimensionless number indicates the relative strength of the buoyant to viscous forces?
A.Prandtl number
B.Grashoff number
C.Froude’s number
D.Weber number
In the electrical network analysis method the total radiation which leaves a surface per unit time per unit area is termed as
A.Radiosity
B.Irradiation
C.Flux
D.Spatial resistance
E.Potential
