Internal gear cutting operation can be performed by
Answer: C
Internal gear cutting operation can be performed by shaping with pinion cutter. In the case of ‘rotating pinion type cutter’, such an indexing is not required, therefore, this type is more productive and so common.
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In a gating system, the ratio 1: 2: 4 represents
Answer: A
Gate Ratio is defined as the ratio of sprue base area, followed by the total runner area and the total ingate area. The sprue base area is taken is unity.
So, 1: 2: 4 = Sprue base area: Runner area: Total ingate area
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What is the welding defect caused due to improper control and poor removal of slog between passes called?
Answer: B
Under fill is the welding defect caused due to improper control and poor removal of slag between passes.
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Hardness of steel greatly improves with
Answer: B
Hardness is greatly depends on the carbon content present in the steel. Cyaniding is case-hardening with powered potassium cyanide or potassium Ferro cyanide mixed with potassium bi-chromate, substituted for carbon. Cyaniding produces a thin but very hard case in a very short time.
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Stellite preserves hardness up to a temperature of
Answer: D
No answer description available for this question.
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If a particular Fe-C alloy contains less than 0.83?rbon, it is called
Answer: B
The carbon alloy having less than 2?rbon are called “steels” and those containing over 2?rbon are called cast irons. Now, steel may further be classified into two groups.
(i) Steels having less than 0.83?rbon are called “hypo-eutectoid steels”
(ii) Those having more than 0.83?rbon called “hyper-eutectoid steels”
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Quality screw threads are produced by
Answer: D
Quality screw threads are produced by only thread casting. Quality screw threads are made by die-casting and permanent mould casting is very accurate and of high finish, if properly made.
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A drill bit of 20 mm diameter rotating at 500 r.p.m. with a feed rate of 0.2 mm/revolution is used to drill a through hole in a mild steel plate 20 mm thickness. The depth of cut in this drilling operation is
Answer: C
No answer description available for this question.
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Allowance in limits and fits refers to
Answer: A
Allowance is an intentional difference between the maximum material limits of mating parts. For shaft, the maximum material limit will be its high limit and for hole, it will be its low limit. So, allowance refers to maximum clearance between shaft and hole.
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Which of the following arc welding processes does not use consumable electrodes?
Answer: B
GTAW is also called as Tungsten Inert Gas welding (TIG). The electrode is non-consumable since its melting point is about 3400°C.
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