Answer: Stress is a measure of the load applied to a sample relative to a cross sectional area of the sample. Strength is a quantification of the samples ability to carry a load. The terms “yield strength” and “yield stress” of a material are usually used interchangeably (correct or not). It is the stress which will […]
Difference between Yield Stress and Yield Strength? Read More »
Answer: Both terms are same when gravity is uniform. When gravity is non-uniform following are the terms: The centre of mass is a point that acts as if all the mass was centered there (the mass on one side of the point is equal to the mass on the opposite side). If supported at the centre
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Answer: When a material is compressed in one direction, it usually tends to expand in the other two directions perpendicular to the direction of compression. This phenomenon is called the Poisson effect. Poisson’s ratio is a measure of the Poisson effect. For rubber = 0.5 For steel = 0.288 For wood < 0.2 Thus, Poisson’s ratio
Poisson’s Ratio is higher in Rubber, Steel or Wood? Read More »
Answer: In Welding, concentrated heat (high temperature) is applied at the joint of metal and fuse together. In Brazing, involves significantly lower temperatures and does not entail the melting of base metals. Instead, a filler metal is melted and forced to flow into the joint through capillary action.
Answer: unilateral tolerance: A unilateral tolerance is tolerance in which variation is permitted only in one direction from the specified direction. e.g., 1900 +0.000/-0.060. Bilateral tolerance: Bilateral tolerance is tolerance in which variation is permitted in both directions from the specified direction. e.g., 1900 +0.060/-0.060
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DIFFERENCE BETWEEN ANTI FRICTION AKA ROLLER BEARING AND JOURNAL BEARING Answer: Generally, journal bearings have higher friction force, consume higher energy and release more heat, but they have larger contact surface, so normally used in low-speed high load applications. In anti-friction bearings friction is less. One object just rolls over each other. Classification of Bearings: Rolling
State the difference between Anti Friction Bearing and Journal Bearing? Read More »
Answer: The shape and distribution of the carbides in the iron determines the hardness of the steel. Carbides can be dissolved in austenite is the basis of the heat treatment of steel. If steel is heated above the A critical temperature to dissolve all the carbides, and then cooled, suitable cooling through the cooling range will
What causes hardness in steel? How heat treatment alters properties of steel? Read More »
Answer: Mechanical engineering is the discipline that combines the principles of engineering, physics and materials science for the design, analysis, manufacturing, and maintenance of mechanical systems. It is the branch of engineering that involves the design, production, and operation of machinery and tools. Technology shows various methods of Engineering. A bridge can be made by using
The rated speed tells us about the maximum speed which can be achieved by a vehicle or some other machine but the economical speed means the speed limit at which the machine works efficiently with least consumption of fuel. e.g. in normal bikes(not racing),the maximum speed limit shown on speedometer is up to 120 km/hr
What is the difference between Speed and Economic Speed? Read More »
COMPARISON BETWEEN SI AND CI ENGINES The pros and cons of SI and C.I. engines are as follows: Fuel economy The main comparison between the two types of engines is how efficiently each engine converts fuel into work energy. The thermal efficiencies of various engines are compared. Thermal efficiency is defined as the ratio of
