Answer / viral shah

As per faraday's law of electromagnetic induction emf produce across the conductor exposed to time varying magnetic field.
when we apply pulsating DC then time varying magnetic field produce...so we get emf across secondary winding

Answer / pramit dutta

Transformer is transfer energy from primary to secondary.
So it needs changing flux in its core so that the flux can cut
across windings and induced voltage and current. We know,
e=-N da/dt ,where a is flux in core. So if pulsating dc id applied to its primary then the lines of flux will be constant. So e will be 0. So energy can't be transfered.

what is the reason for harmonics introduced in the line

2 Answers  

---

how vfd drives energy save

5 Answers   PowerTech,

---

ult of expression 'document.FrmQF.myem

0 Answers  

---

If Ac supply is given to the DC motor then what will happen? clear explanation

2 Answers  

---

Why does a TV set have two pin plug whereas the moniter of a computer has three pin plug? Isn't the earthing protection required for the TV set

2 Answers  

---

what is VFD and where is use of it

5 Answers  

---

what is the use of starter in tube light?and what it contains

12 Answers   L&T, RRB,

---

Please define ampere?

0 Answers  

---

Why is shaft current insulation required on large motors & when should it be checked i.e. before or after assembly?

2 Answers   Aramco,

---

the input mechanical power of a single alternator is increased,its RPM increased but in case of an alternator synchronised with grid its RPM does not increased with increase of input mechanical power. why?

3 Answers   Bhel,

---

if 2 coil of 1000W connect in series and 200 v is applied across it . then what is the total power of coil when coil have only resistive load .

1 Answers   BSNL,

---

54 Comments Alok and Bhanu play the following min-max game. Given the expression N = 38 + X*(Y – Z) where X, Y and Z are variables representing single digits (0 to 9), Alok would like to maximize N while Bhanu would like to minimize it. Towards this end, Alok chooses a single digit number and Bhanu substitutes this for a variable of her choice (X, Y or Z). Alok then chooses the next value and Bhanu, the variable to substitute the value. Finally Alok proposes the value for the remaining variable. Assuming both play to their optimal strategies, the value of N at the end of the game would be?

0 Answers   Bajaj, TCS,

---