nodak (bahuviklpi)

vaayuyaan ka nodak

nodak ya propelar (propeller) aise yantr ya machine ko kehte hain jo kisi vaahan par laga ho aur use aage dhakelane ka kaam kare. nodakon ke ghoornan (rotation) ke dvaara vaayu ya jal ko peechhe feinkane mein madad milti hai jisse yaan par aage ki or bal lagta hai. samudri jahaajon aur vaayuyaanon par lage pankhenuma nodak jal ya hava ko peechhe feinkakar yaan ko aage ki taraf dhakelate hain.

nodak shabd se nimnalikhit ka taatparya nikal sakta hai:

is tarah tarabaain vaatar vheel ki praakrutik roop se viksit takaneek hai. haalaanki, jab tak audyogik kraanti naheen hui thi, tab tak aadhunik tarabaain ka vikaas naheen hua tha. aitihaasik taur par dekhein to 19veen sadi mein yeh badi-badi faiktariyon mein istemaal hota tha. lekin, jab bijli ki utpatti hui tab se kaarkhaanon mein jenaretar ka istemaal hone laga. ab agar tarabaain ki kaaryapranaali ki baat karein to yeh nyootan ke teesare gati niyam ke adhaar par kaam karti hai. yaani pratyek kriya par, vipreet pratikriya hoti hai. isi tarah tarabaain ka propelar kaam karta hai. propelar mein laga spaaindal hava ya paani par dabaav banaata hai. isi dabaav ki vajah se propelar tarabaain ko peechhe ki or dhakka maarta hai, jisse vah chalti hai. aamtaur par tarabaain ko ek jagah rakh diya jaata hai, taaki jab bhi paani usase hokar gujre to tarabaain ke har blade par padne vaale dabaav se vah chal pade. hava ya paani ke tarabaain ke saath ek hi niyam laagoo hota hai. jitna adhik paani ya hava ka pravaah hoga, tarabaain utani tej gati se chalegi.


propelar naam ki bahut si cheejein bhi ullekhaneeya hain:

  • propelar, estoniya ka ek sangeet gut hai
  • propelar TV, Britain ki ek telivijn channel hai
  • propelar, Britain ki ek naatak mandali hai
  • propelar rekordj, ek sangeet nirmaata company hai