These MCQ too in fluid mechanic by streeter 484APPLICATIONS OF FLUID MECHANICS[Chap. 1010.76. Experiments show that in the aging of pipes(a) the friction factor increases linearly with time(b) a pipe becomes smoother with use(c) the absolute roughness increases linearly with time(d) no appreciable trends can be found(e) the absolute roughness decreases with time10.77. In the analysis of unsteady-flow situations the following formulas maybe utilized:(a) equation of motion, Bernoulli equation, momentum equation(b) equation of motion, continuity equation, momentum equation(c) equation of motion, continuity equation, Bernoulli equation(d) momentum equation, continuity equation, Bernoulli equation(e) none of thesc answers10.78. Neglecting friction, the maximum difference in elevation of the twomenisci of an oscillating U-tube is 1.0 ft, L = 3.0 ft. The period of oscillation is,in seconds,(a) 0.52(b) 1.92(c) 3.27(d) 20.6(e) none of theseanswers10.79. The maximum specd of the liquid column in Prob. 10.78 is, in feet persecond,(a) 0.15(b) 0.31(c) 1.64(d) 3.28(e) none of theseanswers10.80. In frictionless oscillation of a U-tube, L = 4.0 ft, z = 0, V = 6 ft/sec.The maximum value of z is, in feet,(a) 0.75(b) 1.50(c) 6.00(d) 24.0(e) none of theseanswers10.81. In analyzing the oscillation of a U-tube with laminar resistance, theassumption is made that the(a) motion is steady(b) resistance is constant(c) Darcy-Weisbach equation applies(d) resistance is a linear function of the displacement(e) resistance is the same at any instant as if the motion were steady10.82. When 16»/D² = 5 and 2g/L = 12 in oscillation of a U-tube withlaminar resistance,(a) the resistance is so small that it may be neglected(b) the menisci oscillate about the z = 0 axis(c) the velocity is a maximum when z = 0(d) the velocity is zero when z = 0(e) the speed of column is a linear function of zCLOSED-CONDUIT FLOW485 10.69. The hydraulic grade line is(a) always above the energy grade line(b) always above the elosed conduit(c) always sloping downward in the direction of flow(d) the velocity head below the energy grade line(e) upward in direction of flow when pipe is inclined downwardCLOSED-CONDUIT FLOW48310.70. In solving a séries-pipe problem for discharge, Bernoulli's equation isused along with the continuity equation to obtain an expression that contains aV²/2g and f1, f2, etc. The next step in the solution is to assume(a) Q(b) V(c) R(d) fı, f2, · . .(e) none of thesequantities10.71. One pipe system is said to be equivalent to another pipe system whenthe following two quantities are the same:(а) h, Q(b) L, Q(c) L, D(d) f, D(e) V, D10.72. In parallel-pipe problems(a) the head losses through each pipe are added to obtain the totalhead loss(b) the discharge is the same through all the pipes(c) the head loss is the same through each pipe(d) a direct solution gives the flow through each pipe when the total flowis known(e) a trial solution is not nceded10.73. Branching-pipe problems are solved(a) analytically by using as many equations as unknowns(b) by the Hardy Cross method of correcting assumed flows(c) by equivalent lengths(d) by assuming a distribution which satisfies continuity and computinga correction(e) by assuming the elevation of hydraulic grade line at the junetionpoint and trying to satisfy continuity10.74. In networks of pipes(a) the head loss around each elementary circuit must be zero(b) the (horsepower) loss in all circuits is the same(c) the elevation of hydraulic grade line is assumed for each junetion(d) elementary circuits are replaced by equivalent pipes(e) friction facetors are assumed for each pipe10.75. The following quantities are computed by using 4R in place of diam-eter, for noncircular sections:(a) velocity, relative roughness(b) velocity, head loss(c) Reynolds number, relative roughness, head loss(d) velocity, Reynolds number, friction factor(e) none of these answers

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10.76. Experiments show that in the aging of pipes (a) the friction factor increases linearly with time (b) a pipe becomes smoother with use (c) the absolute roughness increases linearly with time (d) no appreciable trends can be found (e) the absolute roughness decreases with time

10.76. Experiments show that in the aging of pipes (a) the friction factor increases linearly with time (b) a pipe becomes smoother with use (c) the absolute roughness increases linearly with time (d) no appreciable trends can be found (e) the absolute roughness decreases with time

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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