31. In resistance heating highest working temperature is obtained from heating elements made of A. Nickel copper B. Nichrome C. Silicon carbide D. Silver Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
32. A non-dimensional number generally associated with natural convection heat transfer is A. Prandtl number B. Grashoff number C. Peclet number D. Nusselt number Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
33. Method has leading power factor A. Resistance heating B. Dielectric heating C. Arc heating D. Induction heating Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
34. The process of heat transfer during the re-entry of satellites and missiles, at very high speeds, into earth?s atmosphere is known as A. Ablation B. Radiation C. Viscous dissipation D. Irradiation Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
35. Ajax Wyatt furnace is started when A. It is filled below core level B. It is filled above core level C. It is fully empty D. None of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
36. In the indirect resistance heating method, maximum heat-transfer takes place by A. Radiation B. Convection C. Conduction D. Any of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
37. Induction heating process is based on which of the following principles? A. Thermal ion release principle B. Nucleate heating principle C. Resistance heating principle D. Electromagnetic induction principle Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
38. ________ is used for heating non-conducting materials. A. Eddy current heating B. Arc heating C. Induction heating D. Dielectric heating Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
39. Which of the following devices is necessarily required for automatic temperature control in a furnace? A. Thermostat B. Thermocouple C. Autotransformer D. Heating elements of variable resistance material Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
40. Direct arc furnaces have which of the following power factors? A. Unity B. Low, lagging C. Low, leading D. Any of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
