A slab of insulating material of thickness 6 cm and thermal conductivity 1.4kJ/m hr deg is placed between and is in contact with two parallel electrodes, and is then subjected to high frequency dielectric heating at a uniform rate of 140,000kJ/m³ hr. At steady state coefficients of combined radiation and convection are 42 and 48 kJ/m² hr deg. If atmospheric temperature is 25 degree Celsius, find surface temperatures?

165.40 degree Celsius and 165.45 degree Celsius

144.10 degree Celsius and 134.47 degree Celsius

123.50 degree Celsius and 154.34 degree Celsius

121.60 degree Celsius and 115.45 degree Celsius

A slab of insulating material of thickness 6 cm and thermal conductivi

1.	A slab of insulating material of thickness 6 cm and thermal conductivity 1.4kJ/m hr deg is placed between and is in contact with two parallel electrodes, and is then subjected to high frequency dielectric heating at a uniform rate of 140,000kJ/m³ hr. At steady state coefficients of combined radiation and convection are 42 and 48 kJ/m² hr deg. If atmospheric temperature is 25 degree Celsius, find surface temperatures?
A.	144.10 degree Celsius and 134.47 degree Celsius
B.	123.50 degree Celsius and 154.34 degree Celsius
C.	121.60 degree Celsius and 115.45 degree Celsius
D.	165.40 degree Celsius and 165.45 degree Celsius
Answer» D. 165.40 degree Celsius and 165.45 degree Celsius

Discussion

No Comment Found

Related MCQs

A solid sphere of 8 cm radius has a uniform heat generation of 4000000 W/m³. The outside surface is exposed to a fluid at 150 degree Celsius with convective heat transfer coefficient of 750 W/m² K. If thermal conductivity of the solid material is 30 W/m K, determine maximum temperature
An 8 cm diameter orange, approximately spherical in shape, undergoes ripening process and generates 18000 k J/m³ hr of energy. If external surface of the orange is at 6.5 degree Celsius, find out the temperature at the center of the orange. Take thermal conductivity = 0.8 k J/ m hr degree for the orange material
Identify the correct boundary condition for a hollow sphere with inside surface insulated.
A hollow sphere (k = 30 W/m K) of inner radius 6 cm and outside radius 8 cm has a heat generation rate of 4000000 W/m³. The inside surface is insulated and heat is removed by convection over the outside surface by a fluid at 100 degree Celsius with surface conductance 300 W/m² K. Make calculations for the temperature at the outside surfaces of the sphere
A composite slab consists of 5 cm thick layer of steel (k = 146 kJ/m hr degree) on the left side and a 6 cm thick layer of brass (k = 276 kJ/m hr degree) on the right hand side. The outer surfaces of the steel and brass are maintained at 100 degree Celsius and 50 degree Celsius. The contact between the two slabs is perfect and heat is generated at the rate of 4.2 * 10⁵ k J/m² hr at the plane of contact. The heat thus generated is dissipated from both sides of composite slab for steady state conditions. Calculate the temperature at the interface
Consider a slab of thickness δ with one side (x = 0) insulated and other side (x = δ) maintained at constant temperature. The rate of uniform heat generation within the slab is q g W/m³. Presuming that the heat conduction is in steady state and one dimensional along x direction, the maximum temperature in the slab would occur at x equal
There occurs heat conduction and internal heat generation at uniform rate within the conduction medium itself in the following cases(i) Drying of concrete(ii) Chemical processes(iii) Fuel elements in a nuclear reactionChoose the correct option
In case when both the surfaces of plane wall are at different temperature, we get an expression i.e.T MAX – T W2 /T W1 – TW2 = (B + 1)²/4BWhat is the value of B?
Suppose heat is conducted due to electronsWhere, i = I/A and p is the resistivity, then
Which one of the following materials are quickly heated by applying high frequency?

Discussion

No Comment Found

Related MCQs

Reply to Comment