The ductile materials, during machining, produce
Answer: D
No answer description available for this question.
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What is the type of welding defect caused due to poor deposition of weld rod is called?
Answer: A
Porosity is a welding defect caused due to poor deposition of weld rod.
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Two streams of liquid metal which are not hot enough to fuse properly result into a casting defect known as
Answer: A
Two streams of liquid metal which are not hot enough to fuse properly result into a casting defect known as cold shut. This defect is same as in sand mould casting. The reasons are:-
(i) Cooling of die or loss of plasticity of the metal.
(ii) Shot speed less.
(iii) Air-vent or overflow is closed.
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Hardness of green sand mould increases with
Answer: C
Permeability or porosity of the moulding sand is the measure of its ability to permit air to flow through it. So, hardness of green sand mould increases by restricted the air permitted in the sand i.e. decrease its permeability.
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Which one among the following welding processes uses non-consumable electrode?
Answer: C
GTAW is also called as Tungsten Inert Gas Welding (TIG). The arc is maintained between the work piece and a tungsten electrode by an inert gas. The electrode is non-consumable since its melting point is about 3400⁰C.
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A lead-screw with half nuts in a lathe, free to rotate in both directions has
Answer: D
A lead-screw with half nuts in a lathe, free to rotate in both directions had Acme threads. When it is used in conjunction with a split nut, as on the lead screw of a lathe, the tapered sides of the threads facilitate ready to engagement and disengagement of the halves of the nut when required.
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The cutting speed for drilling __________ with high speed steel drills is 24 to 45 m/min.
Answer: A
No answer description available for this question.
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The primary purpose of a sprue in a casting mould is to
Answer: C
From the pouring basin, the molten metal is transported down into the mould cavity by means of the sprue or down-gate. It is a vertical channel that connects the pouring basin with runners and gates.
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What is the type of welding defect is caused due to stresses on heating and cooling called?
Answer: B
Slag entrapment (inclusions) welding defect is caused due to stresses on heating and cooling.
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A type of welding flows, which is the result of a perfect proportion and mixture of acetylene and oxygen and is used for fusion welding of steel and cast iron, is
Answer: D
Neutral flame is the result of a perfect proportion and mixture of acetylene and oxygen. It releases only heat and harmless gases. Inner cone of a neutral flame is smooth and rounded. It is used for fusion welding of steel and cast iron.
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