A. The pressure intensity at vena contracta is atmospheric
B. Contraction is least at vena contracta
C. Stream lines are parallel throughout the jet at vena contracta
D. Coefficient of contraction is always less than one
Fluid Mechanics
In a Sutro weir, the discharge is proportional to________________?
A. H1/2
B. H3/2
C. H5/2
D. H
where H is head
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
The speed of a pressure wave through a pipe depends upon________________?
A. the length of pipe
B. the viscosity of fluid
C. the bulk modulus for the fluid
D. the original head
Two pipe systems are said to be equivalent when_________________?
A. head loss and discharge are same in two systems
B. length of pipe and discharge are same in two systems
C. friction factor and length are same in two systems
D. length and diameter are same in two systems
Surge wave in a rectangular channel is an example of_________________?
1. steady flow
2. unsteady flow
3. uniform flow
4. non-uniform flow
The correct answer is?
A. (1) and (3)
B. (2) and (3)
C. (1) and (4)
D. (2) and (4)
For laminar flow in circular pipes, the Darcy’s friction factor f is equal to_________________?
A. 16/Re
B. 32/ Re
C. 64/ Re
D. none of the above where R,, is Reynolds number
The viscosity of a gas_______________?
A. decreases with increase in temperature
B. increases with increase in temperature
C. is independent of temperature
D. is independent of pressure for very high pressure intensities
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
The major loss of energy in long pipes is due to_______________?
A. sudden enlargement
B. sudden contraction
C. gradual contraction or enlargement
D. friction
