1
GATE ME 2006
MCQ (Single Correct Answer)
+1
-0.3
A disk clutch is required to transmit $$5$$ $$kW$$ at $$2000$$ $$rpm$$ the disk has a friction lining with Coefficient of friction equal to $$0.25.$$ Bore radius of friction lining is equal to $$25mm.$$ Assume uniform contact pressure of $$1MPa.$$ The value of outside radius of the friction lining is
A
$$39.4$$ $$mm$$
B
$$49.5$$ $$mm$$
C
$$97.9$$ $$mm$$
D
$$142.9$$ $$mm$$
2
GATE ME 2006
MCQ (Single Correct Answer)
+2
-0.6
A $$4$$ $$mm$$ thick sheet is rolled with $$300$$ $$mm$$ diameter rolls to reduce thickness without any change in its width. The friction coefficient at the work-roll interface is $$0.1.$$ The minimum possible thickness of the sheet that can be produced in a single pass is
A
$$1.0mm$$
B
$$1.5mm$$
C
$$2.5mm$$
D
$$3.7mm$$
3
GATE ME 2006
MCQ (Single Correct Answer)
+2
-0.6
In a sand casting operation, the total liquid head is maintained constant such that it is equal to the mould height. The time taken to fill the mould with a top gate is $${t_A}.$$ If the same mould is filed with a bottom gate, then the time taken is $${t_B}.$$ Ignore the time required to fill the runner and frictional effects. Assume atmospheric pressure at the top molten metal surfaces. The relation between the $${t_A}$$ and $${t_B}$$ is
A
$${t_B} = \sqrt 2 .{t_A}$$
B
$${t_B} = 2.{t_A}$$
C
$${t_B} = {{{t_A}} \over {\sqrt 2 }}$$
D
$${t_B} = 2\sqrt 2 .{t_A}$$
4
GATE ME 2006
MCQ (Single Correct Answer)
+1
-0.3
An expendable pattern is used in
A
Slush casting
B
Squeeze casting
C
Centrifugal casting
D
Investment casting
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