Hot wire anemometer is used to measure_______________?
(A) discharge
(B) velocity of gas
(C) pressure intensity of gas
(D) pressure intensity of liquid
In steady flow of a fluid, the total accele ration of any fluid particle______________?
(A) can be zero
(B) is never zero
(C) is always zero
(D) is independent of coordinates
The Prartdtl mixing length is_________________?
(A) zero at the pipe wall
(B) maximum at the pipe wall
(C) independent of shear stress
(D) none of the above
The distance from pipe boundary, at which the turbulent shear stress is one-third die wall shear stress, is_______________?
(A) 1/3 R
(B) 1/2 R
(C) 2/3 R
(D) 3/4R
Separation of flow occurs when_________________?
(A) the pressure intensity reaches a minimum
(B) the cross-section of a channel is reduced
(C) the boundary layer comes to rest
(D) all of the above
The value of friction factor ‘f’ for smooth pipes for Reynolds number 106 is approximately equal to________________?
(A) 0.1
(B) 0.01
(C) 0.001
(D) 0.0001
In which of the following the friction drag is generally larger than pressure drag?
(A) a circular disc or plate held normal to flow
(B) a sphere
(C) a cylinder
(D) an airfoil
When an ideal fluid flows past a sphere________________?
(A) highest intensity of pressure occurs around the circumference at right angles to flow
(B) lowest pressure intensity occurs at front stagnation point
(C) lowest pressure intensity occurs at rear stagnation point
(D) total drag is zero
Stanton diagram is a______________?
(A) log-log plot of friction factor against Reynolds number
(B) log-log plot of relative roughness against Reynolds number
(C) semi-log plot of friction factor against Reynolds number
(D) semi-log plot of friction factor against relative roughness
Ay between two stream lines represents________________?
(A) velocity
(B) discharge
(C) head
(D) pressure