1
GATE ME 1999
MCQ (Single Correct Answer)
+2
-0.6
At a production machine, parts arrive according to a Poisson process at the rate of $$0.35$$ parts per minute. Processing time for parts have exponential distribution with mean of $$2$$ minutes. What is the probability that a random part arrival finds that there are already $$8$$ parts in the system (in machine $$ + $$ in queue)?
A
$$0.0247$$
B
$$0.0576$$
C
$$0.0173$$
D
$$0.082$$
2
GATE ME 1999
MCQ (Single Correct Answer)
+1
-0.3
Which of the following materials requires the largest shrinkage allowance, while making a pattern for casting?
A
Aluminium
B
Brass
C
Cast Iron
D
Plain Carbon Steel
3
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.
4
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
$$MIG$$
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