Answer / meenakshi

An electric arc is an electrical breakdown of a gas which
produces an ongoing plasma discharge, resulting from a
current flowing through normally nonconductive media such
as air.A spark is triggered when the electric field
strength exceeds approximately 4–30 kV/cm—the dielectric
field strength of air.arc is continuous discharge whereas
spark is momentary.votage developed due to arc is
comparitively lower.example for natural spark is lightng
where the potential difference between cloud n grnd is very
high.

Answer / thiru

Spark has discrete nature while arc has continuous nature.when there is loose connection at point of connection there will be sparking, and if you open high voltage isolator switch on onload,arc will be generated.

Answer / shyam uttej

arcing between two contacts is controlled phenomenon.while spark is uncontrolled phenomenon

Answer / ajaykumar

arc is comes from only one conductor, spark comes between two conductors

how do we calculate of transformer in va?what is calculation?

2 Answers  

---

1. What is maximum permissible distance between smoke detectors ? 2. How do we decide number of smoke detectors required in a large office, warehouse, hall etc ? 3. What should be maximum height of smoke detectors ? 4. Where do we use heat detector, optical smoke detector, temperature sensitive detector ?

1 Answers  

---

why dont we connect the two 12 V DC batteries in parallel, for an inverter (UPS)? is there any harm ?

6 Answers  

---

What is working principle of ACB and VCB?

9 Answers   Greenko, HCC,

---

what is gapless metal oxide techniques?

1 Answers  

---

why exciter frequency 150 Hz ?

1 Answers   Siemens,

---

why in scott connection of transformers, main transformer is tapped at 50% and teaser transformer at 86.6%?

5 Answers   Bhel, Bosch, College School Exams Tests, Wipro,

---

How Much Capacity of Diesel Genset is suitable for 20 no.s of 1.5ton AC's & Why?(Load Calculation)

11 Answers   Lapis Technologies,

---

for a 11kv transmission line what capacity of CTs & PTs are required?

4 Answers  

---

How to do maint. Of busbar.

1 Answers   KSEB, L&T, Siemens,

---

Using 11000V/433V,3 ph,50Hz,500 KVA, what is the maximum capacity of motor in KW that can be connected and started at a single moment? Also explain about any calculations and formulas used in deriving the same.

4 Answers  

---

What is the complete procedure of erection of electrical panel in industry

1 Answers   BTM, Imerys,

---