1
GATE ME 1990
MCQ (Single Correct Answer)
+1
-0.3
The predominant forces acting on an element of fluid in the boundary layer over a flat plate in a uniform parallel stream are:
A
Viscous and pressure forces
B
Viscous and inertia force
C
Viscous and body forces
D
Inertia and pressure forces
2
GATE ME 1990
Subjective
+5
-0
A jet of water with a velocity $${V_1}$$ (Figure shown below) and area of cross-section $${A_1}$$ enters a stream of slow moving water in a pipe of area $${A_2}$$ and velocity $${V_2}$$. The two streams enter with the same pressure $${P_1}$$. After thoroughly mixing in the pipe the stream emerges as a single stream with velocity $${V_3}$$ and pressure $${p_2}$$. If there are no losses in the flow, determine $$\left( {{p_2} - {p_1}} \right)$$ for
$${V_1} = 20\,\,m/s,\,\,$$
$${V_2} = 10\,\,m/s,\,\,$$
$${A_1} = 0.01\,\,{m^2},\,$$
$$\,{A_2} = 0.02\,{m^2},$$
density of water $$\rho = 1000kg/{m^3}.$$ GATE ME 1990 Fluid Mechanics - Fluid Dynamics Question 2 English
3
GATE ME 1990
MCQ (Single Correct Answer)
+1
-0.3
Thermal conductivity is lower for
A
wood
B
air
C
water at $${100^ \circ }C$$
D
steam at $$1$$ bar
4
GATE ME 1990
Subjective
+5
-0
An iron rod $$\left( {K = 41.5W/mK} \right)$$ of $$15mm$$ diameter and $$160mm$$ long extends out of a hot surface of temp $${150^ \circ }C$$ into environment at $${36^ \circ }C.$$The free end of the rod is insulated. If the film heat transfer coefficient is $$25W/{m^2}K,$$ calculate the rate of heat flowing out of the hot surface through the rod and the temp at the insulated end of the rod.
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