When vitrified sewer pipe is used to drain a side ditch, the pipe joints are
closed tightly to prevent dirt from entering and clogging the pipe.
(Each question of this kind consists of a series of statements related to the
stem that precedes them. Indicate which are true and which false with respect
to the stem.)
Water pockets are a great nuisance to the track maintenance crew. They are
Created by operating numerous heavy trains over poor quality ballast.
Caused by pumping ties.
The cause of heaving roadbed.
The result of soil erosion.
Caused by porous material surrounded by impenetrable material.
A good roadbed is essential to a railroad because it:
Receives train weight from ballast above and transmits it to ground
Compensates for irregularities of terrain.
Supports ballast above adjacent ground to provide run-off for water.
Provides the stability that a track needs.
Should be spongy to reduce shock to rails and provide a comfortable
As a track supervisor in an oversea area, you would select new ballast on the
basis of the:
Wakati vitrified mfereji bomba ni kutumika drain a upande mtaro, joints bomba ni kufungwa tightly kuzuia uchafu kutoka kuingia na clogging bomba. (Kila swali la aina hii lina mfululizo wa taarifa zinazohusiana na shina linalotangulia. Kuonyesha ambayo ni kweli na ambayo ni uongo kuhusiana na shina.) Mifuko ya maji ni msukosuko mkubwa kwa wafanyakazi wa kudumisha reli. Wao ni kuundwa na kuendesha treni nyingi nzito juu ya ballast duni ubora. Ilisababishwa na pumping ties. Sababu ya kuinuka kwa barabara. Matokeo ya mmomonyoko wa udongo. Inasababishwa na nyenzo porous kuzungukwa na nyenzo impenetrable. Barabara nzuri ni muhimu kwa reli kwa sababu: Inapokea uzito wa gari moshi kutoka kwa ballast juu na kuipitisha kwenye ardhi Inalipiza kwa ukosefu wa kawaida wa ardhi. Inasaidia ballast juu ya ardhi jirani kutoa run-off kwa ajili ya maji. Hutoa utulivu ambao reli inahitaji. Kwa mfano, kama mkurugenzi wa reli katika eneo la nje ya bahari, ungependa kuchagua ballast mpya kwa msingi wa: