Answer / nithin shaju

Applying DC power to a transformer will not step up/down
the voltage,since the current reaches its peak within
milliseconds and remain constant.Therefore no induction
happens.So secondary voltage is induced only during the
current growing period (millisec).After that as long as
there is no fluctuation, sec voltage will be 0.
There is no
problem in connecting dc power suppply to a
transformer.Only winding resistance is taken into
account.But if the current is too high there is a chance of
burning the insulation.

Answer / uma

When the transformer is used with dc excitation, flux rises to the point where magnetic saturation occurs, causing a large increase in magnetizing current & overheating of the transformer. therefore they operate in ac.

Answer / venkat

we cannot apply DC power to transformer as it is an ac machine and on applying DC power the windings of the transformer gets short circuited due to unidirectional flow of electric charge

Answer / ahmed

We can apply dc supply to transformer, but here impedance
is only resistance in casof DC.large amount of current will
flow through the promary windings depending on the
magnitude of primary voltage applied.Secondary will not
induce any voltage.

how many types of dc batteries standards are present?

2 Answers  

---

how would you determin the horsepower of a motor without a nameplate

3 Answers  

---

what is inverter

12 Answers   Bhel,

---

HOW isolation transformer works.

2 Answers  

---

What is the difference between phase, neutral wire and earth cable. if neutral is connected to ground, y we need earthing cable? what difference in hot and cold wire? do neutral wire carry current?

1 Answers  

---

how much watts are equal to one unit of energy meter?

9 Answers  

---

why we use crushed stone in switch yard?

3 Answers  

---

The unit of current is the:(a) Volt(b) Coulomb(c) Joule(d) Ampere

2 Answers  

---

what is servomechanism?

1 Answers  

---

why selected genration, transmission or any at 11kv, 132, 220, 220 or 440 voltage which is propotional to 11. why does not any for ex. 12 kv 13kv or any

2 Answers  

---

If we tell 60 sq.mm. 3-1/2 core cable,then what does it mean ? 1) Each core section in the whole cable is of 60 sq. mm. 2) The whole cable is of 60 sq. mm. which is sub-divided into 3-1/2 core.

3 Answers   Cura HealthCare,

---

why induction motors are rated at 0.8 power factor.

0 Answers   Bhel, TN,

---