1
GATE PI 2001
Subjective
+5
-0
For true centrifugal casting process with the axis of rotation in horizontal direction, an acceleration of $$75g,$$ where $$g$$ is the acceleration due to gravity, is required for sound casting. The relation between diameter. $$'D'$$ (in $$mm$$) and the rotational speed $$N$$ ($$1$$ $$rev/s$$) for this casting is $${N^2}D =$$ constant, determine the constant. Also calculate the mold speed (in $$rev/sec(c)$$ for casting $$CI$$ pipes of $$5m$$ long with outside and inside diameters of $$0.52m$$ and $$0.5m$$ respectively
2
GATE PI 2001
+1
-0.3
Which of the following powders should be fed for effective oxy-fuel cutting of stainless steel
A
Steel
B
Aluminium
C
Copper
D
Ceramic
3
GATE PI 2001
+5
-1.5
A weld is made using $$MIG$$ welding process with the following welding parameters: Current: $$200A;$$ Voltage: $$25V;$$ Welding speed: $$18$$ $$cm/min;$$ wire diameter: $$1.2$$ $$mm;$$ Wire feed rate: $$4$$ $$m/min;$$ Thermal efficiency of the process: $$65\%$$

The heat input per unit length of the weld in $$kJ/cm$$ is:

A
$$0.18$$
B
$$0.28$$
C
$$10.83$$
D
$$16.66$$
4
GATE PI 2001
+5
-1.5
A weld is made using $$MIG$$ welding process with the following welding parameters: Current: $$200A;$$ Voltage: $$25V;$$ Welding speed: $$18$$ $$cm/min;$$ wire diameter: $$1.2$$ $$mm;$$ Wire feed rate: $$4$$ $$m/min;$$ Thermal efficiency of the process: $$65\%$$

The area of cross section of weld bead in $$m{m^2}$$ is:

A
$$16.3$$
B
$$25.1$$
C
$$30.3$$
D
$$38.6$$
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