(a) Describe the Ajax Wyatt (Vertical core) type induction furnace an…
Previous year question for Utilization of Electrical Energy.
Question
(a) Describe the Ajax Wyatt (Vertical core) type induction furnace and explain its working. (10)
(b) A $40\text{ kW}$, $3$-phase, $400\text{ V}$, resistance oven to employ nichrome strip $0.25\text{ mm}$ thick for the three star-connected heating elements. If the wire temperature is to be $1200^\circ\text{C}$ and that of the charge is to be $800\text{ }^\circ\text{C}$, estimate a suitable width of the strip. Assume emissivity $= 0.9$ and radiating efficiency $= 0.5$. Also determine the temperature of the wire when the charge is cold. The specific resistance of the nichrome-alloy is $1.3 \times 10^{-6}\text{ ohm-m}$. (10)
- Year: 2018
- Subject: Utilization of Electrical Energy