The process best in terms of close control of tolerance and surface finish IS Casting Joining All of the above bur answer is: . b. Forming d. Machining f. None of the above Castability is poor for: High melting point material b. Low melting point material Ductile material d. All of the above None of the above pur answer is: . The material which can be manufactured by non-conventional method is/are b. Titanium alloy d. All of the above Ceramics Super alloys None of the above pur answer is: . Hand tools like wrenches, spanner etc. are made by the process of Casting Machining None of the above b. Forging d. Rolling pur answer is: . Riser is designed to ensure that molten metal in riser Freezes before the casting Freezes at the same time as the casting b. Freezes after the casting d. All of the above None of the above pur answer is: .
Design Against Fluctuating Loads
Machine elements are subjected to varieties of loads, some components are subjected to static loads, while some machine components are subjected to fluctuating loads, whose load magnitude tends to fluctuate. The components of a machine, when rotating at a high speed, are subjected to a high degree of load, which fluctuates from a high value to a low value. For the machine elements under the action of static loads, static failure theories are applied to know the safe and hazardous working conditions and regions. However, most of the machine elements are subjected to variable or fluctuating stresses, due to the nature of load that fluctuates from high magnitude to low magnitude. Also, the nature of the loads is repetitive. For instance, shafts, bearings, cams and followers, and so on.
Design Against Fluctuating Load
Stress is defined as force per unit area. When there is localization of huge stresses in mechanical components, due to irregularities present in components and sudden changes in cross-section is known as stress concentration. For example, groves, keyways, screw threads, oil holes, splines etc. are irregularities.
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