1071. A centrifugal pump’s head is largely determined by the following:
A. Power of pump
B. Nature of the liquid being pumped
C. Point of the vanes and the speed of the tip of the impeller *
D. Vapour pressure of the liquid
1072. The maximum head that can be developed by a single impeller is __________ Ft:
A. 25
B. 100
C. 250-300 *
D. 1000
1073. At its vena-contracta, the fluid jet discharges from an orifice with a diameter of 2 inches. The co-efficient of contraction is:
A. 1.3
B. 0.766 *
C. 0.87
D. None of these
1074. Propellers are :
A. Axial flow mixers *
B. Low speed impeller
C. Utilized for blending fluids of high thickness
D. Radial flow mixers
1075. Turbine impeller :
A. Produces only radial current
B. Produces only tangential current
C. Is powerful over extensive variety of viscosities *
D. Does not produce tangential current
1076. Baffles in mixing tanks are provided to :
A. Reduce swirling and vortex formation *
B. Increment the primary strength of the tank
C. Aid in rotational flow
D. none of these
1077. Power required for mixing newtonian fluids is a function of :
A. Speed of impeller , distance across of impeller and thickness
B. Density and viscosity of fluid only
C. The fluid’s density, viscosity, and the impeller’s diameter alone
D. None of these *
1078. Power number is the ratio of :
A. Drag stress to inertial stress *
B. Inertial stress to drag stress
C. Inertial stress to gravitational stress
D. Gravitational stress to drag stress
1079. Froude number is the ratio of :
A. Shear stress to gravitational stress
B. Drag stress to shear stress
C. Inertial stress to shear stress
D. Inertial stress to gravitational stress *
1080. Froude number is not a factor :
A. For Reynolds number greater than 300
B. When there is no formation of a vortex*
C. For unbaffled tank
D. None of these