List of top Fluid Mechanics Questions

A stationary object is fully submerged in a static fluid, as shown in the figure. Here, CG and CB stand for the center of gravity and the center of buoyancy, respectively. Which one(s) among the following statements is/are true?

Consider steady fully-developed incompressible flow of a Newtonian fluid between two infinite parallel flat plates. The plates move in the opposite directions, as shown in the figure. In the absence of body force and pressure gradient, the ratio of shear stress at the top surface ($y=H$) to that at the bottom surface ($y=0$) is

A two-dimensional incompressible flow field is defined as \[ \vec V(x,y)=(Axy)\,\hat{\imath}+(By^2)\,\hat{\jmath}, \] where $A$ and $B$ are constants. The dynamic viscosity is $\mu$. In the absence of body force, which expression represents the {pressure gradient} at the location $(5,0)$ in the concerned flow field?

Match the following measuring instruments with the appropriate figures: I – Pitot probe II – Pitot-static probe III – Piezometer

Figures: (P), (Q), (R)

Among the following non-dimensional numbers, which one characterizes periodicity present in a transient flow?

For an incompressible boundary layer flow over a flat plate (figure shown), the momentum thickness is expressed as

Among the shear stress versus shear strain rate curves shown in the figure, which one corresponds to a shear thinning fluid?

Consider steady incompressible flow over a flat plate, where the dashed line represents the edge of the boundary layer, as shown in the figure. Which one among the following statements is true?

An inviscid steady incompressible flow is formed by combining a uniform flow with velocity $U_\infty$ and a clockwise vortex of strength $K$ at the origin, as shown in the figure. Velocity potential ($\phi$) for the combined flow in polar coordinates $(r,\theta)$ is

The most commonly used pump in tractor hydraulic system are.

Match List I with List II

	LIST I (Pump)		LIST II (Requirement)
A.	Multistage centri-fugal of moderate size impellers	I.	High head and low discharge
B.	Archimedean screw type pump	II.	Low head and large discharge
C.	stuple reciprocating pump	III.	High head and moderate discharge
D.	Axial flow propeller pump	IV.	Low head and low discharg

Choose the most appropriate answer from the options given below:

A commonly used hand pump is the.

The sensitiveness of a bubble tube in a level would decrease if.

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: As temperature increases, viscosity of air decreases. 
Reason R: As the temperature increases, activity of air molecule increases. 
In the light of the above statements, choose the correct answer from the options given below

Unit of kinematic viscosity is.

Match List I with List II

List I		List II
A.	Propeller turbine	I	Impulse turbine
B.	Tangential turbine	II	Kaplan turbine
C.	Reaction is zero	III	Gas turbine
D.	Reaction turbine	IV	Pelton turbine

Choose the correct answer from the options given below:

Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): In flow over immersed bodies, drag can be created without lift.
Reasons (R): In flow over immersed bodies, lift cannot be created without drag.
In the light of the above statements, choose the most appropriate answer from the options given below:

Which of the following equation is used to calculate the actual delivery of oil from any hydraulic pump?

The unit of dynamic viscosity in C.4.S. system is -

Match List I with List II

List I		List II
A.	Dynamic Viscosity	I.	Pascal Second
B.	Force	II.	Newton
C.	Pressure	III.	Pascal
D.	Kinematic viscosity (cus unit)	IV.	Stoke

Choose the correct answer from the options given below :

Parameters to be calculate using forward kinematics are:

Centre of buoyancy always

In a Reaction turbine the length of draught tube is limited by the:

Diameter of a wind turbine is 3m, width of blade 20cm and number of blades as 20. The solidity factor for this wind turbine is: