1
GATE ME 1999
Subjective
+5
-0
In a particular mold design, the down sprue has an area of Cross section of $$6.45\,\,c{m^2}$$ where the pouring basin leads into the sprue. The sprue is $$20$$ $$cm$$ long. The required metal flow rate at the top section of the sprue is $$820$$ $$c{m^3}/s.$$ Determine the pouring height necessary above the sprue top. Also determine the area of $$C.S$$ of sprue at its bottom to avoid the aspiration of liquid molten metal.
2
GATE ME 1999
MCQ (Single Correct Answer)
+5
-1.5
For butt welding $$40mm$$ thick steel plates, when the expected quantity of such jobs is $$5000$$ per month over a period of $$10$$ years, choose the best suitable welding process out of the following available alternatives.
A
$$SAW$$
B
Oxy-acytylene gas welding
C
$$EBM$$
D
$$MIG$$
3
GATE ME 1999
MCQ (Single Correct Answer)
+5
-1.5
In butt welding operation on plates, the heat input necessary is given by GATE ME 1999 Production Engineering - Welding Process Question 1 English

$$Q = 8\,K\,{T_c}\,t\,\,\,\left[ {0.2 + {{Vb} \over {4\alpha }}} \right]$$
Where $$K=$$ thermal conductivity,
$${T_c} = $$ temp increases from room temp up to $$MP,$$
$$t=$$ thickness of plate,
$$V=$$ welding speed,
$$b=$$ width of weld,
$$\alpha = thermal diffusivity

Two alloy steel plates as shown in fig are to be welded using a power source rated at $$5$$ $$kVA$$ having a duty cycle of $$75\% .$$ Using the given data, determine the maximum welding speed for the job given in $$mm/s$$

Data : $$K = 45\,W/{m^0}C,\,\,{T_c} = {1450^ \circ }C,$$ and
$$\alpha = 1.2 \times {10^{ - 5}}\,\,{m^2}/s.$$

A
$$14.2$$
B
$$19.0$$
C
$$10.65$$
D
none
4
GATE ME 1999
MCQ (Single Correct Answer)
+2
-0.6
What is the approximate $$\% $$ change in the life, $$t,$$ of the tool with zero rake angle used in orthogonal cutting when its clearance angle, $$\alpha ,$$ is changed from $$10$$ to $$7$$ deg?

(Hint: flank wear rate is proportional to $$\cot \,\alpha $$)

A
$$30\% $$ increase
B
$$30\% $$ decrease
C
$$70\% $$ increase
D
$$70\% $$ decrease
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