Description : In case of end to end connection of two or more pipes in series, the __________ each pipe. (A) Same rate of flow passes through (B) Head loss is same through (C) Rate of flow in each pipe is proportional to the length of (D) Total flow rate is the sum of flow rate in
Last Answer : (A) Same rate of flow passes through
Description : In parallel pipe problems, the (A) Head loss is the same through each pipe (B) Discharge is the same through all the pipes (C) Total head loss is equal to the sum of the head losses through each pipe (D) None of these
Last Answer : (A) Head loss is the same through each pipe
Description : In case of flow through parallel pipes, (A) The head loss for all the pipes is same (B) The total discharge is equal to the sum of discharges in the various pipes (C) The total head loss is the sum of head losses in the various pipes (D) Both (A) and (B)
Last Answer : Answer: Option D
Description : A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if (A) Length of both the pipes is same (B) Diameter of both the pipes is same (C) Loss of ... discharge of both the pipes is same (D) Loss of head and velocity of flow in both the pipes is same
Last Answer : Answer: Option C
Description : The loss of head due to viscosity for laminar flow in pipes is (where d = Diameter of pipe, l = Length of pipe, v w = Specific weight of the flowing liquid) (A) 4 (B) 8 (C) 16 (D) 32
Description : Pick up the correct statement from the following: (A) The internal pressure within a pipe, is caused due to water head and hammer pressure (B) In pressure pipes with water at rest, the pressure ... (C) Sudden closure of a valve, causes the water hammer pressure (D) All the above
Last Answer : (D) All the above
Description : Pick up the correct statement from the following: (A) Head loss in smaller size pipes at equal velocities, is less (B) Cost of pumping is less in smaller size pipes (C) Cost of smaller pipes is comparatively more (D) None of these
Last Answer : (D) None of these
Description : Which of the following statement is wrong? (A) A flow whose streamline is represented by a curve is called two dimensional flow. (B) The total energy of a liquid particle is the sum of potential energy, ... (D) A pitot tube is used to measure the velocity of flow at the required point in a pipe.
Description : A tank is 1/4th full. Two pipes which fill the tank in 30minutes and 40 minutes respectively are opened simultaneously. After 10 minutes, a third pipe which empties the full tank in 60 minutes is also opened. In how many minutes the tank will be full? A) 14 B) 12 C) 15 D) 17
Last Answer : A Since 1/4th is already filled, 3/4th is to filled now. (1/30 + 1/40)*(10+x) – (1/60)*x = ¾ 7/120(10+x)-x/60=3/4 7x-2x/120=3/4-7/12 5x/120=1/6 30x=120 X=4 So total 10+4=14minutes
Description : Pipes P, Q and R which fill the tank together in 12 hours are opened for 2hours after which pipe R was closed. Find the number of hours taken by pipe R to fill the tank if the remaining tank is filled in 14 hours. A) 16 B) 14 C) 20 D) 42
Last Answer : D 1/P + 1/Q + 1/R = 1/12 Now given that first all open for 2hours, then R closed and P+Q completes in 14 hours, so (1/P + 1/Q + 1/R) *2 + (1/P + 1/Q)*14 = 1 Put 1/P + 1/Q = 1/12 – 1/R (1/12 – 1/R + 1/R) *2 + (1/12 – 1/R)*14 = 1 1/6+ 14/12 – 14/R = 1 Solve, R = 42
Description : The total energy line lies over the centre line of the pipe by an amount equal to (A) Pressure head (B) Velocity head (C) Pressure head + velocity head (D) Pressure head - velocity head
Description : The power transmitted through the pipe is maximum when the head lost due to friction is equal to (A) One-fourth of the total supply head (B) One-third of the total supply head (C) One-half of the total supply head (D) Two-third of the total supply head
Last Answer : Answer: Option B
Description : If the velocity of flow as well as the diameter of the flowing pipe are respectively doubled through a pipe system in use since long, the head loss will thereafter be (a) Halved (b) Doubled (c) Increased 4 times (d) No change
Last Answer : (b) Doubled
Description : the loss due to friction in pipes is 4 m, the total losses in strainer and bends may be taken as (A) 0.10 m (B) 0.20 m (C) 0.5 m (D) 1.0 m
Description : Service connections to consumers houses, are generally provided with (A) Copper pipes (B) Hume pipes (C) Galvanised iron pipes (D) P.V.C. pipe
Last Answer : (C) Galvanised iron pipes
Description : The type of pipe commonly used in water supply distribution schemes, is (A) R.C.C. pipes (B) Hume pipes (C) Cast iron pipes (D) G.I. pipes
Last Answer : (C) Cast iron pipes
Description : Pick up the correct statement from the following: (A) Deposition of calcium carbonate on the inside of the well pipe, causes incrustation of the pipe (B) Incrustation of the pipe reduces the discharge (C) Acidic waters cause corrosion of the pipes (D) All the above
Description : Air valves are generally provided in pressure pipes of water supply (A) At pipe junctions (B) At summits (C) At low points (D) Near service pipes
Last Answer : (B) At summits
Description : Barometer is used to measure (A) Velocity of liquid (B) Atmospheric pressure (C) Pressure in pipes and channels (D) Difference of pressure between two points in a pipe
Description : A differential manometer is used to measure (A) Atmospheric pressure (B) Pressure in pipes and channels (C) Pressure in Venturimeter (D) Difference of pressures between two points in a pipe
Description : A manometer is used to measure (A) Atmospheric pressure (B) Pressure in pipes and channels (C) Pressure in Venturimeter (D) Difference of pressures between two points in a pipe
Description : The hammer blow in pipes occurs when (A) There is excessive leakage in the pipe (B) The pipe bursts under high pressure of fluid (C) The flow of fluid through the pipe is suddenly brought to ... valve (D) The flow of fluid through the pipe is gradually brought to rest by closing of the valve
Description : In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said ... co-efficient for flows at equal Reynold number (D) All (A), (B) & (C)
Last Answer : (C) Friction co-efficient for flows at equal Reynold number
Description : If the chosen diameter of a pipe, is less than the economical diameter (A) Cost of pipe will be less (B) Head loss will be high (C) Cost of pumping will be more than saving (D) All the above
Description : 09. The loss of head due to an obstruction in a pipe is twice the loss of head at its entrance. A) Agree B) Disagree
Last Answer : A
Description : The loss of head at entrance in a pipe is (where v = Velocity of liquid in the pipe) (A) v²/2g (B) 0.5v²/2g (C) 0.375v²/2g (D) 0.75v²/2g
Description : The loss of head at exit of a pipe is (where v = Velocity of liquid in the pipe) (A) v²/2g (B) 0.5v²/2g (C) 0.375v²/2g (D) 0.75v²/2g
Last Answer : Answer: Option A
Description : According to Darcy's formula, the loss of head due to friction in the pipe is (where f = Darcy's coefficient, l = Length of pipe, v = Velocity of liquid in pipe, and d = Diameter of pipe) (A) flv²/2gd (B) flv²/gd (C) 3flv²/2gd (D) 4flv²/2gd
Description : The loss of head due to friction in a pipe of uniform diameter in which a viscous flow is taking place, is (where RN = Reynold number) (A) 1/RN (B) 4/RN (C) 16/RN (D) 64/RN
Description : A pipe of I.D. 4 m is bifurcated into two pipes of I.D. 2 m each. If the average velocity of water flowing through the main pipe is 5 m/sec, the average velocity through the bifurcated pipes is (A) 20 m/sec (B) 10 m/sec (C) 5 √2 m/sec (D) 5 m/sec
Last Answer : (B) 10 m/sec
Description : The total discharge from two wells situated near to each other is (A) Sum of the discharges from individual wells (B) Less than the sum of the discharges from individual wells (C) Greater ... of the discharges from individual wells (D) Equal to larger of the two discharges from individual wells
Last Answer : (B) Less than the sum of the discharges from individual wells
Description : The efficiency of power transmission through pipe is (where H = Total supply head, and hf = Head lost due to friction in the pipe) (A) (H - hf )/H (B) H/(H - hf ) (C) (H + hf )/H (D) H/(H + hf )
Description : The power transmitted through the nozzle is maximum when the head lost due to friction in the pipe is __________ of the total supply head. (A) One-half (B) One-third (C) Two-third (D) None of these
Description : In case of a pipe exit fitted with a nozzle, the (A) Conversion of kinetic head to pressure head is facilitated (B) Conversion of pressure head to kinetic head is facilitated (C) Power transmitted through the nozzle ... in the pipe is equal to one third of the total supply head (D) Both (B) and (C)
Last Answer : (D) Both (B) and (C)
Description : The hydraulic gradient line lies over the centre line of the pipe by an amount equal to the (A) Pressure head (B) Velocity head (C) Pressure head + velocity head (D) Pressure head - velocity head
Description : If h is the loss due to friction in a pipe. Total losses in strainer and bends may be taken as (A) 0.01 h (B) 0.45 h (C) 0.20 h (D) 0.25 h
Description : If W is total load per unit area on a panel, D is the diameter of the column head, L is the span in two directions, then the sum of the maximum positive bending moment and average of the negative bending moment for the design of the span ... (L + 2D/3)² (C) WL/10 (L - 2D/3)² (D) WL/12 (L - D/3)²
Description : Which of the following pairs are correctly matched? 1. Piezometric head : Sum of datum head and pressure head 2. Dynamic head : Sum of datum head and velocity head 3. Stagnation head : Sum of Piezometric head and velocity head 4. Total head ... (b) 1, 3 & 4 only (c) 2, 3 & 4 only (d) 1, 2, 3 & 4
Last Answer : (b) 1, 3 & 4 only
Description : The total power used up in a series circuit is ___________. A. the sum of the powers used in each load (resistor) divided by the number of loads B. the sum of the powers used in each load C. always less than the power used in the smallest load D. never more than the power used in largest load
Last Answer : Answer: B
Description : Two pipes P and Q can fill a cistern in 15 minutes and 20 minutes respectively. Both are opened together, but at the end of 5 minutes, the pipe P is t
Last Answer : Two pipes P and Q can fill a cistern in 15 minutes and 20 minutes respectively. Both are opened ... will the pipe Q take to fill the cistern ?
Description : Two pipes X and Y can fill a tank in 6 hours and 8 hours respectively while another pipe Z can empty the tank in 4.8 hours. If all the three pipes are
Last Answer : Two pipes X and Y can fill a tank in 6 hours and 8 hours respectively while another pipe Z can ... then the time in which the tank can be filled.
Description : A pipe can fill a tank in 4 hours and another pipe can empty the same tank in 6 hours. When both the pipes are opened simultaneously, the part of tank
Last Answer : A pipe can fill a tank in 4 hours and another pipe can empty the same tank in 6 hours. When both the ... the part of tank filled in 1 hour is ..
Description : An inverted siphon is designed generally for A. One pipe B. Two pipes C. Three pipes D. Four pipes
Last Answer : ANS: C
Description : For sewers, inverted siphon is provided for A. One pipe B. Two pipes C. Three pipes D. Four pipes
Description : Hydraulic mean radius is A. Mean radius of sewer B. Difference in heads between two points in circular pipes C. Mean of radii in a pipe line of varying cross -sections D. Cross-sectional area/wetted perimeter
Last Answer : ANS: D
Description : The equivalent diameter for the annulus of a double pipe heat exchanger, whose inner pipe has fins on the outside is __________ compared to the same size pipes without fins. (A) More (B) Less (C) Same (D) Unpredictable
Last Answer : (B) Less
Description : During ageing of fluid carrying pipes, the (A) Pipe becomes smoother with use (B) Friction factor increases linearly with time (C) Absolute roughness decreases with time (D) Absolute roughness increases linearly with time
Last Answer : (D) Absolute roughness increases linearly with time
Description : Pick out the wrong statement pertaining to fluid flow. (A) The ratio of average velocity to the maximum velocity for turbulent flow of Newtonian fluid in circular pipes is 0.5 (B) The Newtonian ... at the centre of the pipe (C) Navier-Stokes equation is applicable to the analysis of viscous flows
Last Answer : (A) The ratio of average velocity to the maximum velocity for turbulent flow of Newtonian fluid in circular pipes is 0.5
Description : Consider two pipes of same length and diameter through which water is passed at the same velocity. The friction factor for rough pipe is f1 and that for smooth pipe is f2 . Pick out the correct statement. (A) f1 = f2 (B) f1 < f2 (C) f1 > f2 (D) Data not sufficient to relate f1 & f2
Last Answer : (C) f1 > f2
Description : Venturimeter is used to measure the flow rate of fluids in pipes, when the pipe is in __________ position. (A) Horizontal (B) Vertical (C) Inclined (D) Any
Last Answer : (D) Any