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ABE 2 First Exam > Module 10: Water Pumping Equipment > Flashcards

Module 10: Water Pumping Equipment Flashcards

1
Q

mechanical device used for transferring water from one place to another

A

water pump

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2
Q

the usual source of water of a pump

A
  • lower elevation than the point of delivery
  • wells, rivers, lakes, reservoirs, and canals
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3
Q

they are essential for good health and sustained agri prod

A

water pump

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4
Q

technical terms in pumping

volume of water pumped per unit of time

A

discharge

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5
Q

technical terms in pumping

form of the energy content of the liquid per unit weight of the liquid

A

head

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6
Q

basic principles in pumping water

A
  1. atmospheric pressure
  2. specific gravity
  3. centrifugal force
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7
Q

2 pump classification

A
  1. positive displacement pump
  2. variable displacement pump
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8
Q

pump classification

discharges the same volume of water regardless of the head against which they operate

A

positive displacement pump

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9
Q

pump classification

inverse relationship between discharge
rate and pressure head

P = Q up x D down

A

variable displacement pump

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10
Q

type of positive displacement pump

having to-and-from motion

A

reciprocating pump

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11
Q

basic parts of a recipro pump

A
  • piston or plunger
  • cylinder
  • inlet or admission valve
  • outlet or discharge valve
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12
Q

2 types of recipro pump

A
  1. lift pump
  2. force pump
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13
Q

2 types of recipro pump

single-acting pump na may open cylinder, piston with built-in bucker valve.

nili-lift water to flow out from a spout

A

lift pump

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14
Q

2 types of recipro pump

forces the water above atmospheric pressure as distinguished from the lift pump

may single or double acting pump

A

force pump

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15
Q

major parts of a variable displacement pump

A
  1. impeller
  2. shaft
  3. casing
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16
Q

part of a varia disp pump

converts mech energy into fluid energy by the forcig the liquid to move into rotary motion

A

impeller

17
Q

part of a varia disp pump

it is a wheel or disc mounted on a shaft and meron blades and curved vanes

A

impeller

18
Q

part of a varia disp pump

transmits power from a prime mover to the impeller

A

shaft

19
Q

part of a varia disp pump

intro the liquid into the impeller, collects the liquid leaving the impeller and guides it away under an increased pressure

A

casing

20
Q

types of variable displacement pumps according to hydraulic configurations represented by the arrangement of the impeller and the casing

A
  1. propeller (axial flow) pump
  2. mixed flow pump
  3. centrifugal (radial) pump
21
Q

types of variable displacement pumps according to hydraulic configurations represented by the arrangement of the impeller and the casing

used for low pressure/head and high discharge

drainage pumping

transfer of water from canals

A

propeller (axial flow) pump

22
Q

types of variable displacement pumps according to hydraulic configurations represented by the arrangement of the impeller and the casing

combines features of centrifugal and axial flow pumps in which head is developed partly by the centri force and partly by the lift of the vanes

A

mixed flow pump

23
Q

types of variable displacement pumps according to hydraulic configurations represented by the arrangement of the impeller and the casing

most used for domestic and irrigation purposes

A

centrifugal (radial flow) pump

24
Q

types of centri pump according to energy conversion

A
  1. volute type (spiral) **reduces velocity
  2. diffuser (may diffuser vanes) **small openings
25
Q

types of centri pump according to energy conversionr of stages

A
  1. single stage (single impeller)
  2. multi-stage (2 or more impellers in one shaft and casing)
26
Q

types of centri pump according to type of impeller

A
  1. open impeller **small solids
  2. semi-open/semi-enclosed impeller **w/ suspended sediments
  3. enclosed impeller **for clear water
27
Q

types of centri pump according to type of suction inlet

A
  1. single suction **suction cavity on one side only
  2. double suction **both sides meron
28
Q

types of centri pump according to axis of shaft rotation

A
  1. horizontal
  2. vertical

SHAFT HA

29
Q

types of centri pump according to method of drive

A
  1. direct connected **directly to driver
  2. close-coupled **single unit (shaft + bearings and driver)
  3. belt driven **may pulley head
30
Q

a criterion that is well accepted in computing the pump capacity is to base it on the ??

A

highest daily water requirement of the crop

31
Q

according to the National Irrigation Admin. (NIA),, the water req for rice prod is ___mm/day

A

10 mm/ day

32
Q

this provides an economical installation when an adequate and reliable source of electric power is available at reasonable cost

A

electric motors

33
Q

_______ should be used when the source
of electric power is not reliable or too
costly

A

engine

34
Q

this is the discharge rate of a well per foot drawdown

A

specific yield of well, SY

35
Q

a low horsepower driven axial flow pump with a capacity of up to 3000 liters per minute.

A

IRRI axial flow pump

36
Q

ideal for small-farm irrigation where engine-driven pumps are generally too expensive

A

IRRI “tapat-tapak” pump

37
Q

formula for total drawdown

A

discharge rate (gpm) / specific yield (gpm/ft drawdown)

38
Q

formula for horsepower needed to drive the pump

A

hp sub pm = Q x H all over 3960 x Eff sub s

ABE 2 First Exam (11 decks)

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