1
GATE ME 1996
MCQ (Single Correct Answer)
+1
-0.3
In thick film hydrodynamic journal bearings, the coefficient of friction
A
increases with increase in load
B
is independent of load
C
decreases with increase in load
D
may increase or decrease with increase in load
2
GATE ME 1996
MCQ (Single Correct Answer)
+1
-0.3
Light impurities in the molten metal are prevented from reaching the mold cavity by providing a
A
Strainer
B
Button well
C
Skim bob
D
All of the above
3
GATE ME 1996
Subjective
+5
-0
The pouring basin in a sand mold is $$200$$ $$mm$$ diameter $$100$$ $$mm$$ height. The mould cavity is a cube of $$125$$ $$mm$$ side and must be filled in $$25$$ seconds. The maximum velocity must ensure laminar flow into the mould cavity and in the gates of circular cross-section. Design the sprue to avoid aspiration effects.

Assume
(a) constant temperature,
(b) no loss in the velocity head and
(c) diameter of gate $$=8$$ times diameter at the sprue base.

Properties of the molten metal are $$\gamma = 0.9\,\,m{m^2}$$ per second, $$\rho = 700\,\,kg/{m^3},$$ & $${C_p} = 33.6\,\,J/mol$$-$$K.$$ The diameter of sprue to avoid aspiration effect.

4
GATE ME 1996
Subjective
+2
-0
GATE ME 1996 Production Engineering - Metal Forming Question 24 English
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