B.tech question papers
sub- Utilization of Electrical Energy and Traction.
UTU (uttrakhand technical university
previous year question papers)
Dec 2014
Q1: Attempt any four:
- What are the advantages of induction heating? Give classification of various heating methods.
- What is Ajax-Wyatt Furnace? Describe construction, principle of operation and application of this furnace.
- Discuss advantages of electrically produced heat. State the properties of a heating element used for this heating.
- Explain with help of neat sketch the working of Ajax Wyatt furnace.
- A 40KW 3 phase 400v, resistance oven is to employ nichrome strip 0.25mm thick for the three star-connected heating elements. If the wire temperature is to be 1200C and that of the charge is to be 800C, estimate a suitable width for the strip. Assume emissivity= 0.9 and radiating efficiency=0.5. Also determine the temperature of the wire when the charge is cold.
- What are the factors which limit the choice of frequency in induction and dielectric heating?
