A Beginner’s Guide to Start Trading Coffee
One type of agricultural crop classified as a "soft commodity" is coffee, which is farmed rather than dug. It originates from a plant that is cultivated in much more at over 50 tropical and subtropical regions. Coffee trading is a method of commodity trading that entails purchasing and transferring of contracts for coffee...
Alloying Elements in Brass and Uses
All brasses are basically alloys of copper and zinc. There are two main type of brass.
(i) Alpha brass (upto 37% Zn) for cold working.
(ii) Alpha beta brass (33% to 46% Zn) for hot working.
Stress Strain Diagram is very important diagram to understand the concepts of mechanical engineering. It depicts the variations of strain alongside stress and the various points on the graph i.e. limit of proportionality, yield stress and others
Objective Questions and Solutions, Mechanical/Production
(a) Manufacturing is the process of converting raw material into ______Finished Product_____
(b) The ductility of a piece of chalk is ____approx. zero_______
Answers are marked bold
(c) The % of carbon in medium carbon steel varies
(i) Less than 0.20 (ii) 0.10 to 0.30
(iii) 0.30 to 0.60 (iv) More than 0.60.
(d) Stainless steel comes under the category of
(i)...
Grinding : Abrasives, Grit, Classification of wheels, Bond and Grade
The grinding process is capable of producing very accurate sizes, equally accurate geometry like flatness or circularity and extremely good surface finish. The grinding wheel is capable of machining hardened steel and even hardened high speed steel, which cannot be done by other machining processes.
CHOICE OF ABRASIVES
Emery and corundum, are...
Following are major types of drilling ;
Step drilling: More than one diameter can be ground on the drill body which saves an extra operation.
Counter boring: Often a flat surface is needed around a hole to provide a good seating area for washer and nuts/head of a bolt. The counter boring tool has a pilot, which ensures that...
Pick out the most appropriate option:
Answers are marked bold ;
1. Mild steel is an alloy of iron and carbon with percentage of carbon ranging from
(a) up to 0.2% (b) 0.15–0.3
(c) 0.3–0.5 (d) above 0.5.
2. IZOD test measures
(a) hardness (b) ductility
(c) impact-strength (d) grain size.
3. Copper is used for making electrical conductors because it is
(a) ductile (b) resists corrosion
(c) has...
ALLOYS OF NICKEL
(i) German silver. It is a cupro nickel to which zinc has been added. A typical composition is 60% copper, 30% nickel and 10% zinc. Addition of zinc brings down the cost. Its colour is silvery with a slight pale tinge. It is very ductile and malleable and corrosion resistant. It is used for making electrical contacts,...
Non Ferrous Metals and Alloys - Properties and Uses :
Non-ferrous metals and alloys do not contain any significant quantity of iron. The most common non ferrous metals used in engineering applications are copper, aluminium, tin, lead and zinc. Nickel, magnesium and antimony are also used for alloying the aforesaid non-ferrous metals.
Copper.
Copper is a corrosion resistant metal of an attractive...
