650 Important Hydraulics And Fluid Mechanics MCQ Question and Answer | PDF Free Download
1.The horizontal component of buoyant force is
- ANegligible
- BSame as buoyant force
- CZero
- DNone of the above
2.The region between the separation streamline and the boundary surface of the solid body is known as
- AWake
- BDrag
- CLift
- DBoundary layer
3.The coefficient of viscosity may be determined by
- ACapillary tube method
- BOrifice type viscometer
- CRotating cylinder method
- DAll of these
4.An object having 10 kg mass weighs 9.81 kg on a spring balance. The value of 'g' at this place is
- A10 m/sec²
- B9.81 m/sec²
- C9.75 m/sec²
- D9 m/sec
5.The efficiency of a hydraulic press is given by (where W = Weight lifted by ram, P = Force applied on plunger, A = Area of ram, and a = Area of plunger)
- A(W/p) × (A/a)
- B(p/W) × (a/A)
- C(W/p) × (a/A)
- D(p/W) × (A/a)
6.A metal with specific gravity of 'a' floating in a fluid of same specific gravity 'a' will
- ASink to bottom
- BFloat over fluid
- CPartly immersed
- DBe fully immersed with top surface at fluid surface
7.Impulse turbine is generally fitted
- AAt the level of tail race
- BLittle above the tail race
- CSlightly below the tail race
- DAbout 2.5 m above the tail race to avoid cavitations
8.Which of the following pump is successfully used for lifting water from deep wells?
- ACentrifugal pump
- BReciprocating pump
- CJet pump
- DAir lift pump
9.Which place in hydraulic turbine is most susceptible for cavitations?
- AInlet of draft rube
- BBlade inlet
- CGuide blade
- DPenstock
10.Uniform flow occurs when
- AThe direction and magnitude of the velocity at all points are identical
- BThe velocity of successive fluid particles, at any point, is the same at successive periods of time
- CThe magnitude and direction of the velocity do not change from point to point in the fluid
- DThe fluid particles move in plane or parallel planes and the streamline patterns are identical in each pleasure
11.A flow whose streamline is represented by a curve, is called
- AOne-dimensional flow
- BTwo-dimensional flow
- CThree-dimensional flow
- DFour-dimensional flow
12.The discharge of a double acting reciprocating pump is (where L = Length of stroke, A = Cross-sectional area of piston, and N = Speed of crank in r.p.m.)
- AL.A.N
- B2 L.A.N
- C(L.A.N)/60
- D(2 L.A.N)/60
13.Normal depth in open channel flow is the depth of flow corresponding to
- ASteady flow
- BUnsteady flow
- CLaminar flow
- DUniform flow
14.The length of the divergent cone in a Venturimeter is __________ that of the convergent cone.
- AEqual to
- BDouble
- CThree to four times
- DFive to six times
15.Pressure intensifier increases the pressure in proportion to
- ARatio of diameters
- BSquare of ratio of diameters
- CInverse ratio of diameters
- DSquare of inverse ratio of diameters
16.According to Bernoulli's equation for steady ideal fluid flow
- APrinciple of conservation of mass holds
- BVelocity and pressure are inversely proportional
- CTotal energy is constant throughout
- DThe energy is constant along a streamline but may vary across streamlines
17.A Francis turbine is used when the available head of water is
- A0 to 25 m
- B25 m to 250 m
- CAbove 250 m
- DNone of these
18.Surface tension has the units of
- ANewton-sec/m
- BNewton-m/sec
- CNewton/m
- DNewton
19.A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to bring the liquid level from H1 to H2 will be
- A2A × √H₁/Cd × a × √(2g)
- B2A × √H₂/Cd × a × √(2g)
- C2A × (√H₁ - √H₂)/Cd × a × √(2g)
- D2A × (√H3/2 - √H3/2)/Cd × a × √(2g)
20.Which of the following instrument can be used for measuring speed of an aeroplane?
- AVenturimeter
- BOrifice plate
- CPitot tube
- DRotameter