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Fluid mechanics
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q41 ⇒ Velocity of liquid hydrocarbon fuels in a pipeline can not be measured by magnetic flowmeters, because their __________ is very low/small. electrical conductivity [other wrong options] [Discuss in forum] thermal conductivity specific gravity electrical resistivity |
Q42 ⇒ Which is the correct relationship for a centrifugal pump ? (where, D = Impeller diameter, inches H = Head developed, ft of liquid pumped N = Speed of pump, rpm) D = 1840 H0.5/N [other wrong options] [Discuss in forum] D = 1840 N/H0.5 H = 1840 D0.5/N D = 1840 H/N |
Q43 ⇒ Efficiency of power transmission (η) through a circular pipe is given by (ht - hf)/ht, which has a maximum value of __________ percent. 66.6 [other wrong options] [Discuss in forum] 1.37708333333333 50 88.8 |
Q44 ⇒ The unit of bulk modulus of elasticity for a liquid in S.I. unit is N/m2 [other wrong options] [Discuss in forum] N N/m N/m3 |
Q45 ⇒ The speed of sound in an ideal gas varies as the temperature [other wrong options] [Discuss in forum] pressure density none of these |
Q46 ⇒ Turbulent flow generally occurs for cases involving none of these [other wrong options] [Discuss in forum] highly viscous fluid very narrow passages very slow motion |
Q47 ⇒ The most economical flow control valve for use with large diameter pipes is a butterfly valve [other wrong options] [Discuss in forum] globe valve needle valve none of these |
Q48 ⇒ Friction factor for a hydraulically smooth pipe at NRe = 2100 is f1. If the pipe is further smoothened (i.e., roughness is reduced), the friction factor at the same value of NRe, will increase. [other wrong options] [Discuss in forum] decrease. remain unchanged. increase or decrease depending on the pipe material. |
Q49 ⇒ Path followed by water jet issuing from the bottom of a water tank will be a parabola (vertex being at the opening). [other wrong options] [Discuss in forum] hyperbola. horizontal straight line. zig-zag path (which is geometrically undefined). |
Q50 ⇒ What is the shear rate at the pipe wall, in case of laminar flow of Newtonion fluids in a pipe of diameter 'D' & length 'L' incurring a pressure drop 'Δp' with average velocity 'Vavg'? 8 . Vavg/D [other wrong options] [Discuss in forum] D Δp/8L D Δp/4L 4 . Vavg/D |
Q51 ⇒ For the manometer set up shown in the figure, the pressure difference PA - PB is given (ρH - ρair)gH [other wrong options] [Discuss in forum] (ρH - ρL)gH (ρH - ρL) gH + (ρL - ρair) . g(L - H) (ρH - ρL) gL + (ρL - ρair)gH |
Q52 ⇒ Check valve is used for __________ flow. unidirectional [other wrong options] [Discuss in forum] very precise control of multidirectional none of these |
Q53 ⇒ Power requirement of fans having constant wheel diameter varies __________ fan speed. as cube of [other wrong options] [Discuss in forum] as square of directly as none of these |
Q54 ⇒ A pressure of 10 m head of water is equivalent to __________ kN/m2. 98 [other wrong options] [Discuss in forum] 147 196 49 |
Q55 ⇒ For the same flow rate of a fluid, the pressure drop is the least for venturimeter [other wrong options] [Discuss in forum] orificemeter flow-nozzle Δp is same for all |
Q56 ⇒ In area meter (e.g., rotameter), with increase in the fluid flow rate, the pressure drop is almost constant. [other wrong options] [Discuss in forum] pressure drop increases linearly. area through which fluid flows does not vary. none of these. |
Q57 ⇒ For the laminar flow of a fluid in a circular pipe of radius R, the Hagen-Poisseule equation predicts the volumetric flow rate to be proportional to R4 [other wrong options] [Discuss in forum] R R2 R0.5 |
Q58 ⇒ For flow of fluids through packed bed, the superficial velocity is less than the average velocity through channels. [other wrong options] [Discuss in forum] more than the average velocity through channels. dependent on the pressure drop across the bed. same as the average velocity through channels. |
Q59 ⇒ Centrifugal pump can't be used to pump thick molten soap at 80°C. [other wrong options] [Discuss in forum] molten sodium (used as a coolant in Fast Breeder Reactor). moderately viscous vegetable oil used in soap industry. none of the above. |
Q60 ⇒ Differential manometer measures the pressure difference [other wrong options] [Discuss in forum] absolute pressure gauge pressure pressure gradient |
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