Critical time for developing a water hammer, is the time required for (A) Closing the valve (B) The wave to travel from valve to the reservoir (C) The wave to travel from the valve to the reservoir and back (D) None of these

Critical time for developing a water hammer, is the time required for 

(A) Closing the valve 

(B) The wave to travel from valve to the reservoir 

(C) The wave to travel from the valve to the reservoir and back 

(D) None of these 

by

1 Answer

Answer :

(C) The wave to travel from the valve to the reservoir and back 

by

Related questions

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 rest by closing of the valve (D) The flow of fluid through the pipe is gradually brought to rest by closing of the valve

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

Last Answer : Answer: Option C

Water hammer is caused, when water flowing in a pipe is suddenly brought to rest by closing the valve. The extent of pressure thus produced due to water hammer depends on the (A) Pipe length (B) Fluid velocity in the pipe (C) Time taken to close the valve (D) All (A), (B) and (C)

Description : Water hammer is caused, when water flowing in a pipe is suddenly brought to rest by closing the valve. The extent of pressure thus produced due to water hammer depends on the (A) Pipe length (B) Fluid velocity in the pipe (C) Time taken to close the valve (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

The difference in the reservoir level and the lowest point of the water mains is 180 m. The expected pressure due to water hammer is 7.5 kg/cm2 in a pressure conduit of diameter 1 m. Assuming the efficiency of the riveted joints of the pipe as 0.6 and minimum cover 3 mm for corrosion, the thickness of the pipe materials, is (A) 10 mm (B) 15 mm (C) 20 mm (D) 25 mm

Description : The difference in the reservoir level and the lowest point of the water mains is 180 m. The  expected pressure due to water hammer is 7.5 kg/cm2  in a pressure conduit of diameter 1 m.  Assuming the efficiency of the ... , is  (A) 10 mm  (B) 15 mm  (C) 20 mm  (D) 25 mm 

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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 is equal to water head (C) Sudden closure of a valve, causes the water hammer pressure (D) All the above

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The magnitude of water hammer depends upon the (A) Elastic properties of the pipe material (B) Elastic properties of the liquid flowing through the pipe (C) Speed at which the valve is closed (D) All of the above

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Could BP's closing off the well create a hydraulic hammer?

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Water hammer in a pipeline results from the (A) Bursting of pipelines due to closure by a valve (B) Rapid pressure change due to a rapid change in the rate of flow (C) Pressure increase due to closure of a valve resulting in decrease in rate of flow (D) None of these

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A centrifugal pump is required to be primed before starting if it is located (A) At higher level than water level of reservoir (B) At lower level than water level of reservoir (C) Both (a) and (b) (D) Neither (a) nor (b)

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What characteristic is determined by the time required for a voltage wave to travel from the input end of an artificial transmission line to the output end and back again?

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What characteristic is determined by the time required for a voltage wave to travel from the input end of an artificial transmission line to the output end and back again?

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In a pressure penstock 4500 m long, water is flowing at a velocity of 4 m/s. If the velocity of the pressure wave traveling in the pipe, due sudden complete closure of a valve at the downstream end, is given as 1500 m/s, what would be the period of oscillation in second under frictionless conditions? (a) 6 (b) 8 (c) 9 (d) 11

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Tissues are constructed from many distinct cell types that perform different functions in response to signals from each other and the extracellular matrix. During tissue development and tissue regeneration, stem cells serve as a reservoir of undifferentiated cells that have the capacity to mature into different cell types. What is the name of the process that stem cells undergo when they are required to generate a particular type of cell?

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Pick up the correct statement from the following: (A) If ports are closed, the dry intake towers will not have any water (B) Even if ports are closed, the wet intake tower will have water filled up to reservoir level (C) No buoyant force acts on wet intake towers (D) All the above

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To pump water from a water reservoir 3 m deep and maximum water level at 135 m, a pump is installed to lift water up to R.L. 175 m at a constant rate of 36,00,000 litres per hour. If the length of the pipe is 1506 m and f = 0.01, ignoring other minor losses and assuming the economical diameter from Lea's formula D = 1.2 Q, the water horse power of the pump is (A) 400 (B) 450 (C) 500(D) 600

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A masonry dam (density = 20,000 N/m3 ) 6 m high, one metre wide at the top and 4 m wide at the base, has vertical water face. The minimum stress at the base of the dam when the reservoir is full, will be (A) 75 N/m2 (B) 750 N/m2 (C) 7500 N/m2 (D) 75000 N/m

Description : A masonry dam (density = 20,000 N/m3 ) 6 m high, one metre wide at the top and 4 m wide at the  base, has vertical water face. The minimum stress at the base of the dam when the reservoir is  full, will be  (A) 75 N/m2 (B) 750 N/m2 (C) 7500 N/m2 (D) 75000 N/m

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Consider the following situation in a flow mass curve study when demand line drawn from a ridge in the mass curve does not intersect the mass curve again. This means that : (a) The storage is not adequate (b) The demand cannot be met by the inflow as the reservoir will not refill (c) The reservoir was not full at the beginning (d) The reservoir is wasting water by spill

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Dead storage of a reservoir of Q capacity generally provided for silt deposition during its life time, is generally kept (A) 1/8th Q (B) 1/6th Q (C) 1/5th Q (D) 1/4th Q

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If average volume of sediment deposits is one-tenth million cubic metres per year in a reservoir of total capacity 10 million cubic metres, the dead storage will be filled up, in (A) 10 years (B) 15 years (C) 20 years (D) 25 years

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From the surface of reservoir, evaporation may be minimised by sprinkling (A) Spirit (B) Hydrochloric acid (C) Acetyl alcohol(D) Methane

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Last Answer : (C) Acetyl alcohol

The storage capacity of a reservoir may be divided into three zones. The lowest zone is (A) Dead storage (B) Useful storage(C) Surcharge storage (D) None of these

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Pick up the correct statement from the following: (A) The ratio of the total sediment deposited in the reservoir to the total sediment flowing in the river, is called trap efficiency (B) Small capacity reservoirs on large rivers generally, silt less (C) Large capacity reservoirs on small rivers generally silt more (D) All the above

Description : Pick up the correct statement from the following:  (A) The ratio of the total sediment deposited in the reservoir to the total sediment flowing in  the river, is called trap efficiency  ( ... less  (C) Large capacity reservoirs on small rivers generally silt more  (D) All the above

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Pick up the correct statement from the following: (A) Large solids carried along the river bed, is known as bed load (B) The fine sediment deposits are generally near the face of the dam (C) Deposition of sediment in the reservoir, reduces the capacity of the reservoir (D) All the above

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The rate of silting in a reservoir (A) Is less in the beginning (B) Remains constant throughout (C) Is more in the beginning (D) is more in the beginning and reduces in the end

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Last Answer : (D) is more in the beginning and reduces in the end 

Surcharge storage zone of a reservoir, is (A) Below dead storage (B) Between dead storage and useful storage (C) Above useful storage (D) Also known as valley storage

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Last Answer : (C) Above useful storage 

Profile levelling is usually done for determining (A) Contours of an area (B) Capacity of a reservoir (C) Elevations along a straight line (D) Boundaries of property

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Last Answer : (C) Elevations along a straight line 

For calculating the evaporation rate over a reservoir surface E = 0.771 (1.465 - 0.00732B) (0.44 - 0.007375 V) (pe - pa), the equation is given by (A) Roohwer's, formula in M.K.S. (B) Roohwer's formula in F.P.S. (C) Dalton's formula in F.P.S. (D) Dalton's formula in M.K.S

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Last Answer : Answer: Option A

If the demand line drawn from a ridge in a flow mass curve does not intersect the curve again, it indicates that (A) Demand cannot be met by inflow (B) Reservoir was not full at the beginning (C) Both (A) and (B) (D) None of the above

Description : If the demand line drawn from a ridge in a flow mass curve does not intersect the curve again, it indicates that (A) Demand cannot be met by inflow (B) Reservoir was not full at the beginning (C) Both (A) and (B) (D) None of the above

Last Answer : Answer: Option A

When the reservoir is full, the maximum compressive force in a gravity dam is produced (A) At the toe (B) At the heel (C) Within the middle third of base (D) At centre of base

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Last Answer : Answer: Option A

The Muskingum method of flood routing is a (a) Form of hydraulic routing of a flood (b) Form of reservoir routing (c) Complete numerical solution of St. Venant equations (d) Hydrological channel routing method

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Pick up the correct statement from the following: (A) Air lift pumps are generally used for pumping water from deep wells (B) Jet pumps are generally used for pumping water from small wells (C) The hydraulic ram works on the principle of water hammer (D) All the above

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Surge tanks are used (A) For storage water (B) To increase the velocity in a pipeline (C) As overflow valves (D) To guard against water hammer

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Last Answer : (D) To guard against water hammer 

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19. The water hammer in pipes occurs due to sudden change in the velocity of flowing liquid A) Agree B) Disagree

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Last Answer : A

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A bar chart is commonly used because (a) It is simple to draw and easy to understand (b) It indicates at a glance the overall progress of the project (c) It shows critical and non-critical activities (d) It incorporates uncertainties for delay in estimation of time required for completion of activities.

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If concrete compression test fails, should Schmidt hammer test be adopted as an alternative test to prove the concrete strength?

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