A. Impeller diameter or speed
B. Number of pumps and joining them in series
C. Number of pumps and joining them in parallel
D. All A., B. and C.
Correct Answer: D. All A., B. and C. ✔
Last Updated: March 10, 2019
Related MCQs
- Curve III in the bellow diagram represents a/an__________?
- The main factor on which the behaviour of a mass of fluidised solid depends mainly is the__________?
- Umf is the minimum fluidisation velocity for a bed of particles. An increase in the superficial gas velocity from 2 Umf to 2.5 Umf results in (all velocities are smaller than the entrainment velocity of the particles) no change in the__________?
- What is the unit of kinematic viscosity in SI unit ?
- A rectangular surface 3′ × 4′, has the lower 3 edge horizontal and 6′ below a free oil surface (sp. gr. 0.8). The surface inclination is 300 with the horizontal. The force on one side of the surface is (where, y = specific weight of water) ?
- A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun’s equation for the above fluid-particle system (in SI units) is given below: Δ P/L = 375 × 103 VOM + 10.94 × 106 V2 OM (SI units) If water is to be used as the fluidising medium, in actual operation, the above bed has a height = 1 m. What is the porosity of the fluidised bed ?
- In power law, δ = [A (du/dy)2 + B] then the fluid is__________?
- Drag co-efficient for motion of spherical particles in a stationary fluid in the stoke’s law range is__________?
- Terminal velocity is__________?
- In case of a centrifugal pump, the theoretical head developed is dependent on the __________ the impeller?
- In area meter (e.g., Rotameter), with increase in the fluid flow rate, the__________?
- Minimum porosity for fluidisation is__________?
- Isothermal turbulent flow of a fluid results in decrease of its pressure, which depends on the__________?
- Momentum correction factor used in fluid flow problems accounts for the__________?
- A compressor that takes suction at a pressure below atmospheric and discharge against atmospheric pressure is called a __________ pump?
- A mixed flow centrifugal pump__________?
- Which of the following has the maximum compression ratio ?
- For a stable equilibrium of a submerged body (where, G and B are centres of gravity & buoyancy respectively) ?
- Volute of a centrifugal pump should be designed in a fashion, such that the__________?
- In a stabilised soap bubble, pressure inside it compared to external pressure is__________?
- The contraction co-efficient for Borda’s mouthpiece (for frictionless fluid) is__________?
- The value of critical Reynolds number for pipe flow is__________?
- The range of a particular Rotameter can be increased by__________?
- Propellers are__________?
- Cavitation occurs in a centrifugal pump when the suction pressure is__________?
- Erosion and pits formation on the impeller of a centrifugal pump may be due to__________?
- What is the ratio of total kinetic energy of fluid passing per second to the value obtained on the basis of average velocity (for laminar flow through a circular pipe) ?
- The curve of metacentre for a floating body __________ the curve of buoyancy?
- Slugging occurs in a fluidised bed, if the bed is__________?
- Unsteady non-uniform flow is represented by flow through a/an__________?
- In case of turbulent flow of a Newtonian fluid in a straight pipe, the maximum velocity is equal to (where, Vavg = average fluid velocity)?
- Which law is followed by the velocity distribution in the turbulent boundary layer ?
- f = 16/NRe, is valid for__________?
- Which of the following exemplifies a three dimensional fluid flow ?
- Piezometric head is the sum of the __________ heads?
- The discharge through a semi-circular weir varies as (where, H = Head of liquid.) ?
- Hydraulic __________ works on the principle of Pascal’s law of transmission of fluid pressure?
- Multistage compressors are used in industry, because they__________?
- Dimension of kinematic viscosity is__________?
- In case of Couette flow, the fluid flow is between two large flat parallel plates with__________?
- Weber number is the ratio of inertial force to __________ force?
- Potential flow is the flow of__________?
- Prandtl number is a measure of the__________?
- The head loss in turbulent flow in pipe is proportional to(where, V = velocity of fluid through the pipe) ?
- Gradually varying fluid flow is an example of __________ flow?
- Hydraulic mean radius for flow through packed bed of spherical particle of size, ‘Dp, with porosity ‘ε’ is__________?
- The pressure intensity is the same in all directions at a point in a fluid__________?
- Hot wire anemometer is used to measure the__________?
- The peripheral velocity at inlet of a centrifugal pump having inlet diameter of 25 cms and rotating at 950 rpm is __________ m/sec?
- The fluid velocity varies as the cube of the cylindrical pipe diameter in case of steady state laminar flow at constant pressure drop for __________ fluid?
- Quicksand is an example of a __________ fluid?