1
GATE ME 1999
MCQ (Single Correct Answer)
+1
-0.3
Kinematic viscosity of air at $${20^0}C$$ is given to be $$1.6 \times {10^{ - 5}}\,\,\,{m^2}s.$$ Its kinematic viscosity at $${70^0}C$$ will be varying approximately :
A
$$2.2 \times {10^{ - 5}}\,\,{m^2}/s$$
B
$$1.6 \times {10^{ - 5}}\,\,{m^2}s$$
C
$$1.2 \times {10^{ - 5}}\,\,{m^2}s$$
D
$$3.2 \times {10^{ - 5}}\,\,{m^2}s$$
2
GATE ME 1999
MCQ (Single Correct Answer)
+2
-0.6
Water flows through a vertical contraction from a pipe of diameter $$d$$ to another of diameter $$d/2$$ (see Figure). The flow velocity at the inlet to the contraction is $$2m/s$$ and pressure $$200$$ $$kN/{m^2}.$$ If the height of the contraction measures $$2m$$, then pressure at the exit of the contraction will be very nearly GATE ME 1999 Fluid Mechanics - Fluid Dynamics Question 6 English
A
$$168\,\,kN/{m^2}.$$
B
$$192\,\,kN/{m^2}.$$
C
$$150\,\,kN/{m^2}.$$
D
$$174\,\,kN/{m^2}.$$
3
GATE ME 1999
MCQ (Single Correct Answer)
+2
-0.6
It is proposed to coat a $$1mm$$ diameter wire with enamel paint $$\left( {k\,\,\,\, = 0.1W/m} \right.$$ - $$\left. K \right)$$ to increase heat transfer with air. If the air side heat transfer co-efficiency is $$100$$ $$W/{m^2}K,$$ the optimum thickness of enamel paint should be
A
$$0.25$$ $$mm$$
B
$$0.5$$ $$mm$$
C
$$1$$ $$mm$$
D
$$2$$ $$mm$$
4
GATE ME 1999
Subjective
+5
-0
Two fluids, $$A$$ and $$B$$ exchange heat in a counter-current heat exchanger. Fluid $$A$$ enters at $${420^ \circ }C$$ and has a mass flow rate of $$1$$ $$kg/s.$$ Fluid $$B$$ enters at $${20^ \circ }C$$ and also has a mass flow rate of $$1$$ $$kg/s,$$ Effectiveness of heat exchanger is $$75\% $$. Determine the heat transfer rate and exit temperature of fluid $$B.$$ (Specific heat of fluid $$A$$ is $$1$$ $$kJ/kg$$ $$K$$ and that of fluid $$B$$ is $$4$$ $$kJ/kgK$$).
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