1
GATE PI 2008
MCQ (Single Correct Answer)
+1
-0.3
Laplace transform of $$sin$$ $$ht$$ is
A
$${1 \over {{s^2} - 1}}$$
B
$${1 \over {1 - {s^2}}}$$
C
$${s \over {{s^2} - 1}}$$
D
$${s \over {1 - {s^2}}}$$
2
GATE PI 2008
MCQ (Single Correct Answer)
+2
-0.6
Two pipes of uniform section but different diameters carry water at the same volumetric flow rate. Water properties are the same in the two pipes. The Reynolds number, based on the pipe diameter,
A
is the same in the both pipes
B
is large in the narrow pipe
C
is smaller in the narrower pipe depends on the pipe material
D
depends on the pipe material
3
GATE PI 2008
MCQ (Single Correct Answer)
+2
-0.6
Oil is being pumped through a straight pipe, the pipe length, diameter and volumetric flow rate are all doubled in a new arrangement. The pipe friction factor, however, remains constant. The ratio of pipe frictional losses in the new arrangement to that in the original configuration would be
A
$${1 \over 4}$$
B
$${1 \over 2}$$
C
$$2$$
D
$$4$$
4
GATE PI 2008
MCQ (Single Correct Answer)
+2
-0.6
Two pipes of inner diameter $$100mm$$ and outer diameter $$110mm$$ each are joined by flash butt welding using $$30V$$ power supply. At the interface, $$1mm$$ of material melts from each pipe which has a resistance of $$42$$ Ohms.If the unit melt energy is $$64.4$$ $$MJ/{m^3}$$, then time required for welding (in $$S$$) is
A
$$1$$
B
$$5$$
C
$$10$$
D
$$20$$
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