Two plates of the same metal having equal thickness are to be butt welded with electric arc. When the plate thickness changes, welding is achieved by
Answer: C
Electric arc welding is a welding process wherein coalescence is produced by heating with an arc, with or without the use of filler metals. No filler metal is used in butt weld. So, when the plate thickness changes, welding are achieved by changing the electrode size.
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As tool and work are not in contact in EDM process
Answer: D
In EDM, the thermal energy is employed to melt and vaporize tiny particles of work-material by concentrating the heat energy on a small area of the work-piece. A powerful spark, such as at the terminals of an automobile battery, will cause pitting or erosion of the metal at both anode & cathode. No force occurs between tool & work.
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Green sand mould indicates that
Answer: D
A green sand mould is composed of a mixture of sand (silica sand, SiO₂), clay (which acts as binder) and water. The word green is associated with the condition of wetness or freshness and because the mould is left in the damp condition, hence the name “green sand mould”.
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If the flame of the welding torch is directed towards the progress of welding, then what will you call the welding technique?
Answer: A
Forehand welding is a welding technique in which the welding torch is directed towards the progress of welding.
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The hardness of a grinding wheel is determined by the
Answer: B
Because each abrasive grain usually removes only a very small amount of material at a time, high rates of material removal can be achieved only if a large number of these grains act together. This is done by using bonded abrasives, typically in the form of a grinding wheel. The abrasive grains are held together by a bonding material which acts as supporting posts or brace between the grains and also increases the hardness of the grinding wheel.
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When 3-2-1 principle is used to support and locate a three dimensional work-piece during machining, the number of degrees of freedom that are restricted is
Answer: C
According to 3-2-1 principle, only the minimum locating points should be used to secure location of the work piece in any one plane.
(A) The work piece is resting on three pins A, B, C which are inserted in the base of fixed body. The work piece cannot rotate about the axis XX and YY and also it cannot move downward. In this case, the five degrees of freedom have been arrested.
(B) Two more pins D and E are inserted in the fixed body, in a plane perpendicular to the plane containing, the pins A, B and C. Now the work piece cannot rotate about the Z -axis and also it cannot move towards the left. Hence the addition of pins D and E restrict three more degrees of freedom.
(C) Another pin F in the second vertical face of the fixed body, arrests degree of freedom 9.
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Which of the following engineering materials is the most suitable candidate for hot chamber die casting?
Answer: D
The hot chamber die casting process is used for low melting temperature alloys. Tin is a low melting temperature alloy.
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Cold working of steel is defined as working
Answer: C
Cold forming or cold working can be defined as the plastic deforming of metals and alloys under conditions of temperature and strain rate. Theoretically, the working temperature for cold working is below the recrystallisation temperature of the metal/alloy (which is about one-half the absolute melting temperature).
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Which of the following is the correct data structure for solid models?
Answer: C
Correct data structure for solid models is given by,
Vertices - edges - faces - solid parts
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For machining a mild steel workpiece using carbide tool, the maximum material will be removed at a temperature of
Answer: B
No answer description available for this question.
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