Deck 7: Water Treatment and Plumbing Systems

Question 1

Fluorides in solution form are preferred over powdered form for fluoridation.

Answer 1

False

Question 2

What happens when water contains 8-20 ppm of fluoride concentration?

A)blue baby disease
B)crippling fluorosis
C)dental fluorosis
D)mottling of teeth

Answer 2

crippling fluorosis

Question 3

The process of reducing the fluoride content from water is called________  

A)chlorination
B)fluoridation
C)defluoridation
D)flocculation

Answer 3

defluoridation

Question 4

Which of the following is not used for defluoridation?

A)calcium phosphate
B)copper sulfate
C)alum
D)bone charcoal

Question 5

Which material is used in contact filters for the removal of fluorides?

A)calcium phosphate
B)copper sulfate
C)synthetic tri-calcium phosphate
D)bone charcoal

Question 6

Which material is used for removing fluorides from hard water containing 3ppm of fluorides?

A)lime
B)copper sulfate
C)synthetic tri-calcium phosphate
D)bone charcoal

Question 7

Fluorex is a special mixture of

A)di-calcium phosphate and carbon
B)tri-calcium phosphate and hydroxyapatite
C)di-calcium phosphate and phosphoric acid
D)tri-calcium phosphate and carbon

Question 8

Which of the following is not a component of plumbing water supply system?

A)washbasin
B)water supply and distribution pipes
C)valves
D)storage tanks

Question 9

Which of the following is not a component of the plumbing drainage system?

A)water closets
B)taps
C)vent pipes
D)urinals

Question 10

Light gauge copper tubes are used for general purpose work where the pressure is not more than 0.15 N/mm2.

Question 11

Which of the following is not true about lead pipes?

A)lead pipes are highly resistant to corrosion
B)they have a low hydraulic coefficient of flow
C)lead pipes are highly flexible
D)when lead goes into solution, it has a cumulative poisoning effect

Question 12

Which of the following is not true about plastic pipes?

A)plastic pipes are cheaper than the metal pipes
B)plastic pipes are light in weight
C)plastic pipes can be installed with ordinary tools
D)plastic pipes are corrosive

Question 13

   ____________ is used to measure flows to domestic buildings.

A)rain gauge
B)water tank
C)drainpipe
D)water meter

Question 14

  ____________  is used to measure the flow velocity across a cross-section with a known area.

A)inferential meter
B)anemometer
C)speedometer
D)barometer

Question 15

Inferential meters can be used for both low and high flows.

Question 16

The method of distribution of water is divided into how many types?

A)1
B)2
C)3
D)4

Question 17

In which of the following distribution system, the clean water flows entirely under gravity?

A)gravity system
B)pressure system
C)combined gravity and pumping system
D)pumping system

Question 18

The pressure in the distribution mains does not depend on________                

A)altitude to supply water
B)fire fighting requirements
C)availability of funds
D)quality of water

Question 19

There is a 8 storey residential building in Lucknow. What is the pressure in the distribution mains?

A)2kg/cm²
B)5kg/cm²
C)7kg/cm²
D)10kg/cm²

Question 20

The velocity of water in a 10 cm diameter pipe should be________                

A)0.2m/sec
B)0.5m/sec
C)0.9m/sec
D)1.2m/sec

Question 21

In which system of water supply, water is available for 24 hours but uneconomically used?

A)continuous supply
B)fixed supply
C)intermittent supply
D)low supply

Question 22

In which system of water supply, water is supplied only during fixed hours of the day?

A)continuous supply
B)fixed supply
C)intermittent supply
D)low supply

Question 23

The velocity of water in the pipe is 1.8m/Sec. What is the diameter of pipe used?

A)10cm
B)15cm
C)25cm
D)40cm

Question 24

The hourly demand rate is constant throughout the day.

Question 25

According the mass curve method, the storage capacity is defined as________                

A)maximum excess of supply / maximum excess of demand
B)maximum excess of supply * maximum excess of demand
C)maximum excess of supply - maximum excess of demand
D)maximum excess of supply + maximum excess of demand