1
GATE PI 2011
MCQ (Single Correct Answer)
+2
-0.6
Water is flowing through a horizontal pipe of constant diameter and the flow is laminar. If the diameter of the pipe is increased by $$50\% $$ keeping the volume flow rate constant, then the pressure drop in the pipe due to friction will decrease by
A
$$33\% $$
B
$$50\% $$
C
$$70\% $$
D
$$80\% $$
2
GATE PI 2011
MCQ (Single Correct Answer)
+2
-0.6
Cold water flowing at $$0.1$$ $$kg/s$$ is heated from $${20^ \circ }C$$ to $${70^ \circ }C$$ in a counter-flow type heat exchanger by a hot water stream flowing at $$0.1$$ $$kg/s$$ and entering at $${90^ \circ }C$$. The specific heat of water is $$4200$$ $$J$$($$kg$$ $$K$$) and density is $$1000$$ $$kg/{m^3}.$$ If the overall heat transfer coefficient $$U$$ for the heat exchanger is $$2000$$ $$W/\,\,\left( {{m^2}\,\,K} \right),$$ the required heat exchange area (in $${{m^2}}$$) is
A
$$0.052$$
B
$$0.525$$
C
$$0.151$$
D
$$0.202$$
3
GATE PI 2011
MCQ (Single Correct Answer)
+1
-0.3
In resistance seam welding, the electrode is in the form of a
A
cylinder
B
flat plate
C
coil of wire
D
circular disc
4
GATE PI 2011
MCQ (Single Correct Answer)
+1
-0.3
Which of the following welding process results in the smallest heat affected zone
A
Shielded metal arc welding
B
Gas welding
C
Laser beam welding
D
Thermit welding
EXAM MAP