1
GATE ME 2011
MCQ (Single Correct Answer)
+1
-0.3
A streamline and an equipotential line in a flow field
A
are parallel to each other
B
are perpendicular to each other
C
intersect at an acute angle
D
are identical
2
GATE ME 2011
MCQ (Single Correct Answer)
+2
-0.6
Figure shows the schematic for the measurement of velocity of air (density $$ = 1.2\,\,kg/{m^3}$$ ) through a constant -area duct using a Pilot tube and a water-tube manometer. The differential head of water (density $$ = 1000\,kg/{m^3}$$) in the two columns of the manometer is $$10$$ $$mm.$$ Take acceleration due to gravity as $$9.8$$ $$m/{s^2}.$$ The velocity of air in $$m/s$$ GATE ME 2011 Fluid Mechanics - Fluid Dynamics Question 23 English
A
$$6.4$$
B
$$9.0$$
C
$$12.8$$
D
$$25.6$$
3
GATE ME 2011
MCQ (Single Correct Answer)
+1
-0.3
A pipe of $$25$$ $$mm$$ outer diameter carries steam. The heat transfer coefficient between the cylinder and surrounding is $$5$$ $$W/{m^2}K.$$ It is propsed to reduce the heat loss from the pipe by adding insulation having a thermal conductivity of $$0.05$$ $$W/mK$$. Which one of the following statements is TRUE?
A
The outer radius of the pipe is equal to the critical radius.
B
The outer radius of the pipe is less than the critical radius.
C
Adding the insulation will reduce the heat loss.
D
Adding the insulation will increase the heat loss.
4
GATE ME 2011
MCQ (Single Correct Answer)
+2
-0.6
A spherical steel ball of $$12mm$$ diameter is initially at $$100K.$$ It is slowly cooled in a surrounding of $$300K.$$ The heat transfer coefficient between the steel ball and the surrounding is $$5W/{m^2}K.$$ The thermal conductivity of steel is $$20$$ $$W/mK.$$ The temperature difference between the centre and the surface of steel ball is
A
large because conduction resistance is far high than the convective resistance.
B
large because conduction resistance is far less than the convective resistance.
C
small because conduction resistance is far high than the convective resistance.
D
small because conduction resistance is far less than the convective resistance.
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