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Home⇒ Engineering⇒
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. |
Q21 ⇒ The continuity equation of fluid mechanics utilises the principle of conservation of mass [other wrong options] [Discuss in forum] momentum energy both (b) & (c) |
Q22 ⇒ Water hammer is caused, when water flowing in a pipe is suddenly brought to rest by closing the valve. The extent of pressure thus produced due to water hammer depends on the all (a), (b) and (c) [other wrong options] [Discuss in forum] pipe length fluid velocity in the pipe time taken to close the valve |
Q23 ⇒ Transition length for a turbulent fluid entering into a pipe is around __________ times the pipe diameter. 50 [other wrong options] [Discuss in forum] 5 500 1000 |
Q24 ⇒ Priming is needed in a __________ pump. centrifugal [other wrong options] [Discuss in forum] reciprocating gear diaphragm |
Q25 ⇒ Pascal's law is valid, only when the fluid is at rest. [other wrong options] [Discuss in forum] frictionless and at rest. at rest and when the frictionless fluid is in motion. none of these. |
Q26 ⇒ A centrifugal pump designed to pump water is employed to pump a more viscous oil. In the later case, the pump all (a), (b) and (c). [other wrong options] [Discuss in forum] develops a lower head. capacity is reduced. requires more power. |
Q27 ⇒ A double acting reciprocating pump compared to a single acting pump (of almost same size working under same pressure levels) would give almost double discharge [other wrong options] [Discuss in forum] head efficiency none of these |
Q28 ⇒ A centrifugal pump has the following specificatio 500 [other wrong options] [Discuss in forum] 200 1000 750 |
Q29 ⇒ Rotary vacuum pumps can reduce the absolute pressure to as low as __________ mm Hg. 0.01 [other wrong options] [Discuss in forum] 1 0.1 0.001 |
Q30 ⇒ A pressure head of 320 metres of water in meters of CCl4 (sp.gr = 1.6) will be 200 [other wrong options] [Discuss in forum] 100 320 160 |
Q31 ⇒ Which of the following conditions must be satisfied for lift force to be developed ? Circulation around the body is essentially required. [other wrong options] [Discuss in forum] The body should be bluff body. The body should be stream lined. The main stream velocity must approach the velocity of sound in that fluid medium. |
Q32 ⇒ Choking in case of pipe flow means that a specified mass flow rate can not be achieved. [other wrong options] [Discuss in forum] valve is closed in the line. restriction in flow cross-section area occurs. none of these. |
Q33 ⇒ Self-priming centrifugal pump can be used for all (a), (b) and (c). [other wrong options] [Discuss in forum] booster service. pumping liquid fertilisers (e.g. liquid NH3). pumping industrial wastes. |
Q34 ⇒ Pascal law is not applicable for a/an __________ fluid. none of these [other wrong options] [Discuss in forum] accelerating frictionless static uniformly moving |
Q35 ⇒ Cd is always __________ Cc. greater than [other wrong options] [Discuss in forum] less than equal to either more or less than |
Q36 ⇒ Liquid delivery by centrifugal pump starts, only when the head developed by it is equal to the __________ head. manometric [other wrong options] [Discuss in forum] total static friction |
Q37 ⇒ Which of the following is used for very accurate measurement of flow of gas at low velocity ? Hot wire annemometer [other wrong options] [Discuss in forum] Pitot tube Rotameter Segmental orificemeter |
Q38 ⇒ In fluid flow, the boundary layer separation can not occur none of these. [other wrong options] [Discuss in forum] in case of boundaries experiencing form drag. at points of abrupt changes in the flow directions. in laminar flow. |
Q39 ⇒ What is the ratio of the velocity at the axis of the pipe to the mean velocity of flow in case of pipe flow under viscous condition ? 2 [other wrong options] [Discuss in forum] 0.5 0.67 1 |
Q40 ⇒ An equipotential line is __________ to the velocity vector at every point. normal [other wrong options] [Discuss in forum] normal tangential none of these |
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