Acceleration head in a reciprocating pump
Aincreases the work done during delivery stroke.
Bdecreases the work done during suction stroke.
Cdoes not change the work requirement of the pump.
Dincreases the work done during suction stroke.
ESAS · Question Bank
Fluids Mechanics
79 questions · page 2 of 4. Answer in your head first, then check the solution.
Fluid flow at increasing rate through a diverging pipe is an example of __________ flow.
Asteady uniform
Bnon-steady uniform
Csteady non-uniform
Dnon-steady non-uniform
Drag force acting on a body does not depend upon the
Adensity of the fluid.
Bdensity of the body.
Cvelocity of the body.
Dprojected area of the body.
Centrifugal pump is normally classified on the basis of the
Arpm
Btype of casing.
Cimpeller blade angle.
Dnumber of blades in impeller.
Velocity distribution for flow between two fixed parallel plates
Avaries parabolically across the section.
Bis constant over the entire cross-section.
Cis zero at the plates and increases linearly to the midplane.
Dnone of these.
A mono pump is a __________ pump.
Acentrifugal
Bpiston
Cpositive acting rotary
Da group of vacuum
Higher specific speed (200-500) of a centrifugal pump indicates that the pump is of __________ flow type.
Aaxial
Bradial
Cmixed
Dnone of these
Theoretical head developed by a centrifugal pump does not depend upon the __________ the impeller.
Aradius of
Bspeed of
Cfluid velocity leaving
Dnone of these
Boundary layer separation is caused by the
Areduction of pressure to vapour pressure.
Bboundary layer thickness reducing to zero.
Cadverse pressure gradient.
Dreduction of pressure gradient to zero.
With increase in temperature, the vapor pressure of liquids
Aincreases
Bincreases linearly
Cdecreases
Dremains constant
A mercury (specific gravity = 13.6) manometer connected across an orificemeter fitted in a pipe shows a manometer reading of 2 cms. If the manometer liquid is changed to carbon tetrachloride (specific gravity = 1.6), then for the same flow rate of water the new manometer reading will be __________ cms.
A17
B42
C84
D1.8
Rotary vacuum pumps can reduce the absolute pressure to as low as __________ mm Hg.
A1
B0.1
C0.01
D0.001
The most suitable flow measuring device for the fluid flow measurement in a very large diameter pipeline is a
Aweir
Bpitot tube
CKennison nozzle
DV-notch
A centrifugal pump is called a turbine pump, if it is having a
Aturbine type impeller.
Bvaned diffusion casing.
Crotating vaned volute.
Dnone of these.
Remote control valve is a __________ valve.
Agate
Bneedle
Cbutterfly
Dglobe
The centre of pressure is
Aalways below the centroid of the area.
Balways above the centroid of the area.
Ca point on the line of action of the resultant force.
Dat the centroid of the submerged area.
Pascal law is not applicable for a/an __________ fluid.
Aaccelerating frictionless
Bstatic
Cuniformly moving
Dnone of these
A perfect gas
Adoes not satisfy PV = nRT.
Bis incompressible and has zero viscosity.
Chas constant specific heat.
Dcan't develop shear stresses.
The stress induced in a body, when suddenly loaded, is __________ the stress induced when the same load is applied gradually.
Afour times
Bone-half
Cequal to
Dtwice
The neutral axis of the cross-section a beam is that axis at which the bending stress is
Amaximum
Bzero
Cminimum
Dinfinity