Answer Posted / supreet virdee

Basically MPCB is used to protect motors from malfunctionng
and from overload whereas MCB does not work on three phase,
provides insufficeint protectin by only tripping the
cirrcuit.
MPCB can be used on three phases R,Y,B and provides full
protection to the motor n avoid it from burning.

What is the height of DA, DAL, DB, DC & DDE tower?

1716

---

how dia of wire and angles are calculated for overhead shielding wire to protect substation equipment from lightening strokes???

1568

---

Hi everyone. Some Generators uses 3-Pole breakers with extra contactors for Neutral. Some uses 4-Pole. Why so? What is the idea behind this? Thanks in advance for the solution. Kr.

1612

---

What is The Resistance Formula

776

---

What is the function of interposing current transformer?

598

---

---

in ring main system we use the isolater b/w transfer bus and main bus if we r not use isolatar than wat will be the effect in our sys.

1614

---

In a synchronous motor. if start is running at high speed.  What will be the starting torque : Higher Lower Zero

1245

---

If we use 250A MCCB as a incomer in Control panel for a fault level of 50kA for one second ,assuming temperature rise from 85 Deg. to 100 Deg , Then what will be the Aluminium Bus-bar size for 250A MCCB? Explain in detail.

1837

---

What is the power factor of an alternator at no load?

840

---

if a.c supply is given to the motor,, what happen?

1683

---

why do we carry out winding resistance test?

1840

---

What is meant by system?

653

---

Dear sir, I completed DECE In the year 1995.Now i am working in a private company from last 10 years as an Electrical supervisor.The company having a 1000 KVA transformer.Now i try to apply "C" Licence. I am eligible or not.If not eligible,pls give solution.

1279

---

previous year paper of ntpc bhel for degree in electrical enng

2762

---

What is ferro-resonance in electrical system? Why it occurs and what are measures to prevent it?

1762

---