| With increasing aging of pipes, the ratio of maximum velocity to mean velocity in turbulent flow |
A) initially decreases and then increases
B) initially increases and then decreases
C) decreases
D) increases
| Hydraulic Gradient Line is i. never above the Energy grade line ii. always above the centre line of the pipe iii. always sloping downward in the flow direction |
A) Only (i)
B) (i) and (ii)
C) (ii) and (iii)
D) (i), (ii) and (iii)
| A pipe is said to be siphon if |
A) it can operate without external powers
B) it has sub atmospheric pressure in it
C) it can discharge a liquid at a fast rate
D) the exit is at a lower than the inlet
| Darcy Weisbach friction factor for headloss computation can be obtained from |
A) Moody’s diagram
B) Strange curve
C) specific energy diagram
D) Blench’s curve
| Hydraulic Gradient Line represents the sum of |
A) Pressure Head and kinetic Head
B) Kinetic Head and Elevation Head
C) Pressure Head, Kinetic Head and Elevation Head
D) Pressure Head and Elevation Head
| When a liquid flowing in a pipe is abruptly stopped by closing a valve, the velocity of the water column behind is retarded and its momentum gets dissipated due to conversion of |
A) elastic energy into kinetic energy
B) kinetic energy into potential energy
C) kinetic energy into elastic energy
D) elastic energy into potential energy
| The length of a pipe is 500 m and its diameter is 10 cm. If the diameter of an equivalent pipe is 20 cm, then its length is |
A) 16000 m
B) 20000 m
C) 32000 m
D) 1600 m
| In an long pipeline flowing fluids, which of the followings is causing minor loss? |
A) Pipe material
B) Pipe slope
C) Valves and Bends
D) D-W Friction factor
| Two pipe systems are said to be equivalent when |
A) the head loss due to the friction is same in both the systems
B) the discharge is same in both the systems
C) the same head loss produces the same discharge in both the systems
D) the friction factor and effective length of both the systems are equal
| If the velocity of flow as well as the diameter of the flowing pipe are respectively doubled, the head loss thereafter be |
A) Halved
B) Doubled
C) Increased 4 times
D) No change
