adet 5wss questionnaire +answers 2trim

Upload: eng-bagaragaza-romuald

Post on 14-Oct-2015

18 views

Category:

Documents


0 download

DESCRIPTION

jcgRDs

TRANSCRIPT

  • 5/24/2018 ADET 5WSS Questionnaire +answers 2TRIM

    1/8

    1

    MINEDUC

    ADET/TEVSA

    P.O.BOX 3830 KIGALI-RWANDA

    ADET/TEVSA-INTER-SCHOOL EXAMINATIONS

    SECOND-TERM-2013

    SUBJECT: WATER SUPPLY&SANITATION (WSS)

    CLASS: 5th

    forms PUBLIC WORKS

    LEVEL: PUBLIC WORKS A2

    WEIGHT: 100Marks

    DURATION: 3HOURS

  • 5/24/2018 ADET 5WSS Questionnaire +answers 2TRIM

    2/8

    2

    Attempt ALL QUESTIONS of SECTION A: 55marks

    1. What are the common sources of water to be supplied to theconsumers?(4mks)

    Answer Rainwater Surface water Groundwater Water from reclamation

    2. What do you understand by intake structure in water treatment (4marks)Answer

    Intake are the structure used for admitting water from the surface sources

    (i.e) river, reservoir or lakes and conveying it further to the treatmentplants .

    3. Categorized intake structures according the to their head (10marks)Answer

    4. What do you understand by cavitations(3 marks)Answer

    Cavitations is the phenomenon of formation of vapour bubbles of flowing

    liquid in a region when the pressure of the liquid falls below its vapour

    pressure.

    5. What do you mean by the following terms used in house drainage system:(7 marks)

    a) Refuge (2mrks)b) Sewage (1mrk)c) Hauching (2mrks)d) Soffit (1mrk)e) Invert(1mrk)

    Intake

    Exposed

    intake

    Lake

    intake

    Reservoir

    intake

    Head 1

    Wet intake Dry intake

    Head 3

    Submerged

    intake

    River

    intake

    canal

    intake

  • 5/24/2018 ADET 5WSS Questionnaire +answers 2TRIM

    3/8

    3

    Answers

    a) Refuge: in this term includes all the wastes or rejects left asworthless. It may be in the solid, semi-solid or liquid form.

    b) Sewage: is the liquid waste from a community include sullugewater , water closet, urinals, hospitals and stables.

    c) Hauching:it is a concrete bedding, with additional concrete at thesides of the pipe. Its function is to keep the sewer pipe fixed at one

    place.

    d) Soffit: it is the highest part of the interior of a sewer or pipe drain.e) Invert: it is the lowest point of the interior of a sewer or pipe drain

    6. What are the difference between water carriage system and conservancysystem as system of sewerage?(4mrks)

    Answer

    Water carriage system Conservancy system

    Its a system of undergroundsewer by which the whole

    city is carried out within the

    help of water

    In this system the differenttypes of refuses are collected

    separately with the help of

    manual labour.

    The collected refuse iscarried in carts, trucks ,etcout side of city and dumped

    underground for disposal

    7. What are the stages of sanitary project (4mrks)

    Answer

    Collection of sewage and refuse Conveyance of sewage and refuse Treatment of sewage and refuse Disposal of effluent8. What are the fundamental principles of sanitation? (5marks)

    Answers

    Collection and conveyance of sewage and refuse Orientation of building Dump prevention Water supply Water treatment

  • 5/24/2018 ADET 5WSS Questionnaire +answers 2TRIM

    4/8

    4

    9. With help of sketch, what do you understand by traps (6marks)Answer

    A trap is a depressed or a bent sanitary fitting which always remains full

    of water.

    10.Give at least three functions of a good traps (3marks)Answer

    Is to prevent the passage of foul air or gases It allows the sewage to pass through it It avoids the nuisance which will be developed due to the entry of

    bad smell into house

    11.What are requirements of a good traps, give at least five.(5marks)Answer

    It should be capable of being easily cleaned It should be easily fixed with the drain It should be of simple construction It should posses self-cleansing propertyThe internal and external surfaces should be smooth finish.

  • 5/24/2018 ADET 5WSS Questionnaire +answers 2TRIM

    5/8

    5

    SECTION B: Attempt any THREE (3) questions /30mks

    12.With help of neat sketch draw and denote a section of building showinghouse drainage arrangement. (10mrks)

    Answers

  • 5/24/2018 ADET 5WSS Questionnaire +answers 2TRIM

    6/8

    6

    13.What does the figure bellow represent and name its main parts(10mrks)

    Answers

    It represent a buth tub

    14.(a)What are the two types of water closer (3mrks)(b) Give at least seven common sanitary fittings used in house drainage

    system. (7mrks)

    Answers

    (a)Indian type water closet-European type water closet

    (b) Bath tubs Drinking fountains Flushing cisterns Sinks

  • 5/24/2018 ADET 5WSS Questionnaire +answers 2TRIM

    7/8

    7

    Urinals Wash basin Water closets

    15.(a) What are the tests employed for testing of drain and pipes (5mrks)(c)Give the four principal systems adopted in plumbing of drainage

    works of building. (5mrks)

    Answers

    (a)-Air test

    - Coloured-water test

    -hydraulic test

    -smell test

    -smoke test

    (b)-Single stack system

    -One pipe system

    - One pipe system partially ventilated

    -Two-pipe system

    SECTION C: Compulsory question /15mks

    16.With helpof sketches, explain briefly the different types of traps.(10mrks).

    Answer

    (i) According to the shapes(ii) According to the use

    (i) According to the shapes : there are three types:1.P-traps : This trap

    has a shape of letter

    P

    2.Q-traps: This trap

    has a shape of letter Q3.S-traps: This trap

    has a shape of letter S

    A B C

  • 5/24/2018 ADET 5WSS Questionnaire +answers 2TRIM

    8/8

    8

    (ii) According to the use1.Floor traps: made

    in cast-iron2.gully trap: made of

    stoneware and a cast-

    iron and grating at its

    top

    3.intercepting trap:Is connected to the

    sewer

    A B C

    GOOD LUCK!!