Answer / sunthosh080

Usually the mechanical life of the contactors will in
millions times and they are very easy to control and
operate. Other breakers are large in size and difficult to
control when compared. Also the opening & closing time will
be very less for contactors and in case of any short
circuits contactors can be easily repaired.

Answer / ashwani malhotra

The main function of magnetic contactor is to prevent
accidently operation after the power failure & again
recovery. Because as soon as power fail the holding coil
release the contacts and it will not operate untill someone
complete the hold circuit again .

Answer / amit biswas

magnetic contractor is more of a sequence swiitcing device
while later is aprotection device.

even the contractrs on papers can perform the operation of
a cb.But to my cognizance I had never seen any contracor at
HT level

every time a c b operates it required to chare the spring
manually (or motor but with manual interferance) which is
not in case of contractors

Answer / aamir ansari

the main function of magnetic contactor is control and CB is to protect generally the control is near to the load so it will protect only till the control panel and the CB is protecting whole (From power panel to the load) and also serving as secondary protection for load.

Answer / alok

magnatid contactor are use as aux. contact not for main arc
quanching chamber & medium so contector use in controll
ckt. not in power ckt.

Which Current transformer will be bigger in size, 400/5 or 400/1 & why?

2 Answers   Apollo,

---

how to calculate the no load current in transformer?

0 Answers  

---

What is the constructional difference between ceiling fan and table fan

2 Answers  

---

Why should we use jelly filled armoured cables in underground Communication system? What is the use of the Jelly? If we go for unarmoured, then what happens?

1 Answers   Prasad Group,

---

what is the safty of poly phase tranformer?

0 Answers   Adani,

---

---

In ACS 1000 drive we are using 12 pulse converter,why don't use 3 pulse converter.

0 Answers  

---

what is first ground fault & second ground fault. This is used in rotor protection of alternator.

1 Answers  

---

Why consider motor rpm to select capacitor for motor

1 Answers   KSEB,

---

how much flux density of CRNO core

0 Answers  

---

what is the working of loss of excitation relay (40G)? how it is work?

1 Answers  

---

Spacing of Transformers ratings are 10kva,15kva,25kva,63kva,110kva,150kva .........so on Q) Why transformer are not manufactured having ratings in between or other than these standard ratings ?

3 Answers  

---

I have been short listed for sydicate clerkcal post .i have interview on 15th sept..i want to ask if i don't know kannada to read and write they won't allow me to attend the interview?Do send u r reply.......

1 Answers   Syndicate Bank,

---