Kuchh Bhi Kahin Bhi Kabhi Bhi tech

Q)   What is hot start and cold start in.           motor  ? Hot start - jb hmm motor ko bahur jyada time tk chalate hai toh motor heat ho jata hai or ager is condition me hmm motor ko OFF karke ON kare tb wo motor hot start hota hai, ya motor jyada heat hone per trip ho jaye tb hmm motor ko fir se ON ker de toh is condition ko hot start kahte hai.  Cold start   - jb motor bahut time se ON na hua ho toh motor ka temperature room temperature ke equal hoga or ager hmm is condition me motor ko ON karte hai toh wo motor cold start hota hai.  Motor ko jyada time tk ON rakhne per motor me jo continuously current flow hota hai uski wajah se hi heat produce . hota hai 

 Q)  What is diode  ?  Diode - Diode ek device hai jo current ko ek hi direction me flow krata hai (unidirectional) , diode mein two terminals hote hai anode and cathode, anode matlab (+ve ) and cathode matlab (-ve ), positive ko P se denote karte hai or negative ko N se.  Symbol of diode  Warking of diode 1) Forward Bias - forward bias me diode ke anode ko battery ke positive terminal se or cathode ko negative terminal se connect karte hai . 2) Reverse Bias - reverse bias forward bias ka reverse hota hai ismein diode ke anode ko battery ke negative se or cathode ko battery ke positive se connect karte hai.  Diode two types ke material ka bna hota hai -  a)  Germanium material - diode ke anode ko positive se or cathode ko negative se connect kre or diode germanium material ka ho toh ismein variation hota hai ki ye 0.3volt ke bad hi current ko flow karayega. ye germanium ki property hoti hai ,matlab ismein 0.3volt ka drop ho jata hai....

Q)  1 Ampere me kitna watt hota hai.  1 Ampere - one coulomb per second is called one Ampere.  1A = 1C/second  Hamare ghar me AC supply hoti hai or isliye pahle hmm AC motor ka watt nikalege.  Let . Koi ek Single phase motor hai ,joki AC supply per work karta hai, motor ki rating --- Voltage = 220v Current  = 1A Power factor = cos φ Cos φ = 0.8 Power (P) = V*I*Cos φ P = 220*1*0.8 P = 176watt Let. Koi DC motor hai uski rating --  Voltage = 220 Current = 1Ampere Power (P)  = V*I P = 220*1 P = 220watt Ager hmme voltage & power factor pta ho to hmm 1ampere ko watt me convert ker sakte hai. 

Q)   Why colorful bolls used on                          transmission line  ? 1) Colorful balls ko transmission line me protection ke liye use karte hai. 2) Ye mainly four colors ke hote hai               ( Red, yellow, orange, white)  3) Ye balls hmme dekhne me small lagti      hai but inka diameter approx 36 inch hota hai. Or inka weight approx 5.7kg hota hai . 4) In balls ko hard plastic material se banate hai joki easily nhi tootata.  5) Inka use hilly area, long span, near runway, long river etc, per kiya jata hai.  6) In balls ko isliye lgate hai quki jo smoll aircraft, helicopter hote hai wo in transmission line se tech na ho jaye. Airplane runway ke pass jo transmission line hoti hai waha per bhi in balls ka use karte hai or long distance (long span)  wale place jaise long river ke pass lagate hai  7) In balls ki wajah se...

Q)   Why we use earth wire at the top of.          phase conductor ? *) Transmission line me jo tower ke top per jo wire hota hai wo transmission line ko lightning se protection deta hai, earth wire ko sabse top per isliye lgate hai ki lightning sabse pahle top wire per he aye, earth wire per koi voltage nhi hota isliye lightning ko bhi low resisting path mil jata hai or lightning top wire se tower ke through earth ho jata hai.  *) Transmission line me top wire ko communication ke liye bhi use karte hai, transmission line me communication tower ke top wire ke through hota hai . *) Transmission line me tower ke top wire ko hmm voice ko transfer karne ke liye bhi use karte hai, jb bhi hmm koi call karte hai wo tower ke through dusre person tk pahuchti hai.  *) Ye top wire data ko bhi transfer karta hai, is wire me data jata hai usper  lightning ka koi effect nhi hota hai quki is wire me data light me form me jati hai or light ka current an...

 Q)  Why damper use in transmission.              line  ? *)  Damper - transmission line ke wire me air ki wajah se jo vibration create hota hai jiski wajah se wire ek dusre se short ho sakte hai, is vibration ko reduce karne ke liye damper ka use karte hai.  *) Damper transmission line ke tower ke pass lgaya jata hai, quki vibration ki wajah se Tower per jo insulator lga hota hai wo disbalence ho sakta hai or toot bhi sakta hai.  *) Air ki wajah se transmission line ka wire apne real position se Up- down karte rahte hai, isliye wire ko apne position per maintain karne ke liye bhi damper ka use karte hai.  *) Normally 'stock bridge dampers' he dekhne ko milta hai transmission line me . *) Transmission line me Three phase wire me 'spacer damper' ka use hota hai.  

 Q)  Why earthing pin is longer and.                  thicker in three pin plug ? *) Earthing point hamare device ke body (made by iron)  se connect hota hai, ager kabhi bhi hamara phase ya neutral device ke body se tech ho to earthing point se ground me chala jaye jisse ki hmme current na lage. *) Earthing ka pin long isliye kiya jata hai, ki earthing pin sabse pahle socket ke ander jaye isse ager hamare device me koi bhi fault hoga to sabse pahle ground ho jayga.  *) Earthing ke pin ko normal pin ki jagah thick isliye bante hai ki koi bhi galti se earthing point ko phase or neutral me na lga de, jaisa ki aap jante hai ki earthing pin device ke body se connect hota hai, ager hmm phase point me earthing pin lagayege to hamare device ke body per phase ajayega jisse hmme current lg sakta hai.  *) According to law of resistance,  ager hmm wire ka area increase karege to wire ka resistance decrease hoga, isliye hmme ...

  What is ferranti effect  *)  Ferrenti effect -   transmission line me jb hmm voltage ko transfer kerte hai ek point se dusre point tk, to transmission line ke wire me voltage ka kuchh drop (loss) hota hai resistance ki wajah se, but according to ferranti effect jb hmm transmission line me voltage ko transfer karte hai tb transmission line ke wire me voltage rise (jyada voltage)  hota hai, jo voltage rise hota hai usse ferranti effect kahte hai.  *) Ferranti effect kaise hota hai - ferranti effect imaginary capacitor ki wajah se hota hai.  *) Capacitor me two parallel plate hota hai or inke bicch me dielectric material hota hai.  *) Jb transmission line ke wire me voltage transfer hota hai tb ager hmm kisi 2 wire ko dhekhe to wo 2 wire capacitor ki two  parallel plate ki tarah behave karte hai or inke bicch me jo air hoti hai wo dielectric medium  ki tarah behave karti hai ,or ye imaginary capacitor create karti hai,  isliye in ima...