1
GATE PI 2008
+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
+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
+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
+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
$$20$$
GATE PI Papers
2017
2016
2015
2014
2013
2012
2011
2010
2009
2008
2007
2006
2005
2004
2003
2002
2001
1995
1994
1993
1992
1991
1990
1989
EXAM MAP
Medical
NEET