- W/m.k
- W/m
- W/m.k²
- None, A is just a number
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The heat transfer by conduction through a thick cylinder (Q) is given by (where T₁ = Higher temperature, T₂ = Lower temperature, r₁ = Inside radius, r₂ = Outside radius, l = Length of cylinder, and k = Thermal conductivity)?
Answer: Option 1 The heat transfer by conduction through a thick cylinder (Q) is given by Q = [2πlk (T₁ - T₂)]/2.3 log (r₂/r₁)where T₁ = Higher temperature, T₂ =...
1 Answers 1 views
Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ρ = Density of substance, S = Specific heat, and k = Thermal conductivity)?
Answer: Option 1 Thermal Diffusivity is defined as the ratio of heat conducted to the heat energy stored per unit volume of a material.the thermal conductivity of a substance divided...
1 Answers 1 views
Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)?
Answer: Option 3 Reynolds number (RN) is given byRN = ρ V l /μwhere h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal...
1 Answers 15 views
Fourier's law of heat conduction is (where Q = Amount of heat flow through the body in unit time, A = Surface area of heat flow, taken at right angles to the direction of heat flow, dT = Temperature difference on the two faces of the body, dx = Thickness of the body, through which the heat flows, taken along the direction of heat flow, and k = Thermal conductivity of the body)?
Answer: Option 1 Fourier's law of heat conduction is k. A. (dT/dx) where Q = Amount of heat flow through the body in unit time, A = Surface area of heat...
1 Answers 1 views
The ratio of thermal & electrical conductivity is same for all the metals at the same temperature ; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K)?
Answer: Option 1 Let'
1 Answers 3 views
Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)?
Answer: Option 2 Let'
1 Answers 1 views
Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?
Answer: Option 1 Let'
1 Answers 1 views
Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of __________ percent respectively.?
Answer: Option 1 Let'
1 Answers 1 views
Which of the following statement(s) is/are correct about the attitudes of Alvars and Nayanars towards caste system I. Alvars and Nayanars initiated a movement of protest against the caste system and the dominance of Brahmanas or at least attempted to reform the system. II. Alvars and Nayanars always supported the caste system in the society. III. The importance of the traditions of the Alvars and Nayanars was sometimes indicated by the claim that their compositions were as important as the Vedas?
Answer: Option 3 Alvars and Nayanars initiated a movement of protest against the caste system and the dominance of Brahmanas or at least attempted to reform the system.II. Alvars and...
1 Answers 1 views