Derive the expression for critical radius of insulation for a cylinder and also discuss how thickness of insulation affects the heat transfer rate from a particular body.
See Answer →Calculate the net thermal resistance and the net heat transfer for a composite wall comprising of three walls of lengths L1, L2, L3 and thermal conductivities K1, K2, K3 respectively in series. Area of cross-section is the same for all three walls and is given as A.
See Answer →What is Fourier’s law? What are its key features?
See Answer →The quantity of radiation received by earth from the sun is 1.4 kW/m2
(solar constant). Assuming that sun is an ideal radiator, calculate the surface
temperature of the sun. The ratio of the radius of earth’s orbit to the radius
of the sun is 216.
A hot plate of area 0.5 m2 is maintained at a temperature of 600 C by a 100W electric heater when room temperature is 300 C. The appropriate convection coefficient is 2.15 (T)1/3 W/m2K. What fraction of the heat supplied is lost by natural convection? What happens to the rest of the heat supplied?
Give two examples each of natural and forced circulation
See Answer →What is convection heat transfer? Why is it considered to be a mode of heat transfer?
See Answer →Discuss in detail the aims of studying heat transfer and its various applications.
See Answer →Heat of Atomization
See Answer →Wind Energy
See Answer →Tidal Energy
See Answer →Heat of combustion
See Answer →In how many different ways the solar energy can be used for generating power? Despite solar energy being free, use of solar energy for power is very less. Give reasons.
See Answer →Define biogas and enlist various sources of biogas. How can we use biogas for power generation?
See Answer →Classify different types of coal. Explain any one of them. Which of these coals contains maximum moisture and which contains maximum carbon?
See Answer →Explain the knocking and anti knocking characteristics of a fuel.
See Answer →Briefly describe the major components of closed cycle gas turbine power plants.
See Answer →What are the differences between axial flow and mixed flow double-motion reaction turbines?
See Answer →Differentiate between boiler mountings and boiler accessories. Give two examples of each. Also explain any one of the boiler mountings with a neat sketch.
See Answer →Describe the function of spark plug in a petrol engine. How does combustion occur in diesel engine?
See Answer →