Please Log in or Register for more.


116 views

1 Answer

Answer :

The arcing contacts in a circuit breaker are made of copper tungsten alloy.

Like 0 like

Please log in or register to answer this question.

Related Questions



Last Answer : The voltage appearing across the contacts after opening of the circuit breaker is called recovery voltage.

Show More

419 views 1 answer







The arc temperature in Oil Circuit Breaker may reach up to_______.  (A) 5,000° K (B) 8,000° K (C) 10,000° K (D) None of the above
Last Answer : The arc temperature in Oil Circuit Breaker may reach up to 5,000° K 

Show More

117 views 1 answer







The number of cycles in which a high speed circuit breaker can complete its operation is  (A) 3 to 8 (B) 10 to 18 (C) 20 to 30 (D) 40 to 50
Last Answer : The number of cycles in which a high speed circuit breaker can complete its operation is 3 to 8

Show More

637 views 1 answer







A circuit breaker is designed to protect an electrical circuit from damage caused by :  (A) Over load (B) Short circuit (C) Over current (D) All of the above
Last Answer : A circuit breaker is designed to protect an electrical circuit from damage caused by :  (A) Over load (B) Short circuit (C) Over current (D) All of the above

Show More

106 views 1 answer







The Minimum Oil Circuit Breaker (MOCB) is named because of :  (A) Reduced requirement of oil (B) Reduced requirement of air (C) All of the above (D) None of the above
Last Answer : The Minimum Oil Circuit Breaker (MOCB) is named because of : Reduced requirement of oil 

Show More

163 views 1 answer







For selecting a circuit breaker, ______ should be determined.  (A) initial current that flows on occurrence of a short circuit only (B) transient current that flows at the time of circuit interruption only (C) resonant frequency only (D) (A) and (B) 
Last Answer : For selecting a circuit breaker, ______ should be determined. (A) initial current that flows on occurrence of a short circuit only (B) transient current that flows at the time of circuit interruption only (C) resonant frequency only (D) (A) and (B) 

Show More

78 views 1 answer







ln a minimum oil circuit breaker the oil is used
Last Answer : ln a minimum oil circuit breaker the oil is used to act as circuit breaking medium only

Show More

83 views 1 answer








Last Answer : Arc in a circuit breaker is interrupted at zero current.

Show More

84 views 1 answer








Last Answer : The arc voltage produced in A.C. circuit breaker is always in phase with the arc current.

Show More

317 views 1 answer








Last Answer : In a circuit breaker the basic problem is to transmit large power.

Show More

121 views 1 answer








Last Answer : Ionization in circuit breaker is facilitated by high temperature, increase of mean free path, increasing field strength.

Show More

304 views 1 answer








Last Answer : Air blast circuit breaker is used for repeated duty.

Show More

78 views 1 answer








Last Answer : Magnetic circuit breaker has instantaneous trip action.

Show More

217 views 1 answer








Last Answer : Thermal circuit breaker has delayed trip action.

Show More

154 views 1 answer







what is SF6 circuit breaker?
Last Answer : SF6 is Sulpher hexa Fluoride gas. If this gas is used as arc quenching medium in a Circuit breaker means SF6 CB.

Show More

95 views 2 answers







Explain about Circuit Breaker
Last Answer : Ans: CIRCUIT BREAKERS: In the case of outdoor type installation, the circuit breakers have fixed location and the station layout is such that adequate section clearances are always available from ... carried out as above, every circuit breaker will be completely overhauled after five year interval.

Show More

24 views 1 answer







How to Reset a Circuit Breaker
Last Answer : How to Reset a Circuit Breaker All is well with the lights and your electrical appliances one minute, then everything falls into pitch-black darkness the next moment. When a room in your house ... electrical fires. With these tips, a power surge does not have to be a permanent inconvenience.

Show More

10 views 1 answer







How to Install a Circuit Breaker
Last Answer : How to Install a Circuit Breaker A circuit breaker is an essential component of a home's electric system. When power surges occur, it trips then shuts off the electricity, preventing ... -functional electrical system. Just make sure you take proper safety precautions when installing this device.

Show More

14 views 1 answer







Explain working of static AC circuit breaker. 
Last Answer : Static AC Circuit breaker: The circuit configuration of static AC circuit breaker using SCR is shown in the figure. When switch S' is closed, the SCRs T1 and T2 are fired in positive ... non-availability of gate current. Thus the maximum time delay for breaking the circuit is one half-cycle.

Show More

212 views 1 answer







Explain working of AC circuit breaker using SCR with circuit diagram.
Last Answer : AC Circuit Breaker:  The circuit configuration of static AC circuit breaker using SCR is shown in the figure. When switch S' is closed, the SCRs T1 and T2 are fired in positive ... to non-availability of gate current. Thus the maximum time delay for breaking the circuit is one half-cycle.

Show More

937 views 1 answer







State function of starter and ELCB. (Earth Leakage Circuit Breaker)
Last Answer : i) Function of Starter:- 1. To prevent the high starting current OR to minimize the starting current. 2. To give supply failure protection 3. To give over load and short circuit protection ... an installation and cut off the circuit from power supply and avoid electrical shock to the person.

Show More

457 views 1 answer







Breaking capacity of a circuit breaker is usually expressed in terms of  (1) Ampere (2) Volts (3) MW (4) MVA
Last Answer : Breaking capacity of a circuit breaker is usually expressed in terms of MVA

Show More

268 views 1 answer







The arc voltage in a circuit breaker is :
Last Answer : The arc voltage in a circuit breaker is : in phase with the arc current

Show More

134 views 1 answer







Which of the following is used in a circuit breaker as the medium in which the arc forms? A) Insulating gas B) Insulating oil C) Vacuum D) All the above
Last Answer : Which of the following is used in a circuit breaker as the medium in which the arc forms? A) Insulating gas B) Insulating oil C) Vacuum D) All the above

Show More

117 views 1 answer








Last Answer : The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to extinguish the arc.

Show More

177 views 1 answer








Last Answer : Overheating of relay contacts or contact born out is due to slow making and breaking of load circuit contacts, foreign matter on the contact surface, too low contact pressure.

Show More

150 views 1 answer








Last Answer : In order that current should flow without causing excessive heating or voltage drop, the relay contacts should have low contact resistance, be clean and smooth, be of sufficient size and proper shape.

Show More

153 views 1 answer







The arcing contacts in a circuit breaker are made of (a) copper tungsten alloy (b) porcelain (c) electrolytic copper (d) aluminium alloy
Last Answer : (a) copper tungsten alloy

Show More

16 views 1 answer







What is the most unusual email address you have in your email contacts?
Last Answer : Moderately sexy ninja.

Show More

1 view 1 answer







How would you recommend I transfer all my contacts from an LG phone to iPhone?
Last Answer : answer:You should be able to export your contacts as a .csv file. If the iPhone doesn’t understand that, then everything I’ve ever suspected about Apple is true.

Show More

1 view 1 answer







How to put contacts in for the persistent blinker?
Last Answer : I put the contact on my right index finger, then with my left hand pull my upper eyelid up and with my right middle finger pull my lower eyelid down, then insert. You’re gonna keep trying to blink, the key is to pull your eyelids apart far enough that it doesn’t matter.

Show More

1 view 1 answer







How should contacts feel after the second day of wearing?
Last Answer : Call the doctor’s office and describe what is happening.

Show More

1 view 1 answer







How to save contacts in phone & sim on an HTC Sensation/Android?
Last Answer : For an Android, it should ask you to log into your Google account. You then just use your Google contacts. Technically, you can save contacts to the phone, but I don’t know why you would do that, especially if you’re looking to preserve them beyond that phone.

Show More

1 view 1 answer







How long can a pair of contacts be worn that are supposed to last 30 days?
Last Answer : I wear them for months and months on end. When they start to feel grainy or irritate my eyes, then I throw them out. My insurance doesn't cover vision, so I have learned to make a year supply ... hydrated in the case if you aren't going to be wearing them. You should change the saline regularly.

Show More

1 view 1 answer







Best contacts for dry eyes?
Last Answer : Some people’s eyes are just different. I am still wearing acuvue 2 and apparently those are ‘soooo yesterday’. I tried the acuvue oasys and they were better for not drying my eyes out, so just try something new, or it may just be your eyes. It also depends on if you’re hydrated.

Show More

1 view 1 answer







Why are my contacts doing this?
Last Answer : I haven't worn them for years, but at the time I did it was necessary to go through a period of acclimation, wearing them for a short time, then progressively longer each day. I don't know if the ... - you may be reacting not to the lens, but to the particular hydrator in which it has been soaking.

Show More

0 views 1 answer







Circle contacts - attractive or creepy?
Last Answer : A pal of mine has violet-coloured contacts. After a while I forget she has them in. The photo you’ve linked to doesn’t look especially creepy or Keane-esque to me.

Show More

1 view 1 answer







Should I wear glasses or contacts on a roller coaster?
Last Answer : Contacts are fine. If you’re going on a roller coaster that goes upside down, I’d take them off and store them with all the loose shoes that the attendant keeps as well.

Show More

2 views 1 answer







Are color contacts bad for you?
Last Answer : Wait…what?! There are prescription color contacts. They are no more dangerous that clear contacts. As long as you take care of them and wear them as directed, they are not bad for you (unless your doctor had good reason to not want you to wear contacts)

Show More

2 views 1 answer







For those of you who wear contacts, how long did it take for you to adjust?
Last Answer : answer:They. Are. So. Good. Really hard the first time, but once you got it, you got it. First time, I really did feel like I would never be able to do it though =P I gotta say ... it is just as if you have perfect vision. Possibly the most amazing piece of modern technology I regularly experience.

Show More

1 view 1 answer







I have an LG env3 with a memory card, is there a way i can update my contacts with the memory card?
Last Answer : If your phone doesn’t support importing contacts from the memory card, you can either do it through Verizon, or use a spare phone (have a friend back theirs up) that supports this feature, and then transfer all of the contacts via bluetooth. Good luck.

Show More

1 view 1 answer







Suddenly, I can no longer wear contacts. Has anyone else had this problem, any solutions?
Last Answer : Get corrective surgery. I ad it done about 2 years ago and it has changed my life for the better.

Show More

1 view 1 answer







How can i transfer contacts from nokia n95 to iphone?
Last Answer : Sync the phone to your computer. Then sync the computer to the iPhone. I have not done this on a Nokia, but I would start at one of these links. Nokia Suites for your PC http:/ ... /nokia-pc-suites/editions Nokia iSync for Macintosh http://www.nokiausa.com/get-support-and-software/software/isync

Show More

2 views 1 answer







I need help, how do I delete all my contacts off my ipod touch?
Last Answer : Does she have a separate computer (perhaps one that also has all of her music on it?) Why not just sync the iPod Touch with her computer? It will wipe whatever music, etc, you have on there, but will also wipe your contacts out. I think, anyway.

Show More

1 view 1 answer







What are costume contacts like?
Last Answer : They're not too bad, depending. Don't go cheap on them and inspect the package to make darn sure they are not opened or used. shudder I don't know what kind of contacts you regularly use- but the ... an hour to get used to them because of the size and thickness. After that, it wasn't that bad.

Show More

1 view 1 answer







Please, anyone, what am I doing wrong with my contacts!
Last Answer : I have astigmatism as well, but it doesn't seem to affect my contacts. What brand are you using? I can't use Acuvue..they just feel funny. I use ProClear, and have for many years. Maybe ... is it? It might be irritating you. I usually rinse my contacts off with saline after they soak overnight.

Show More

0 views 1 answer







Do eye contacts hurt?
Last Answer : It depends on if you're the type of person that greats freaked out by touching your eye. Putting them on for the first time will take adjusting to, for some it's quick and easy to ... with color effects. Though they may feel differently than clear ones, they're still reasonably comfortable and fun.

Show More

1 view 1 answer







Help with contacts?
Last Answer : You’ll get used to it over time. Like everything else.

Show More

1 view 1 answer







What's the most reliable way to setup iChat so that I can talk to MSN contacts?
Last Answer : This looks like it might be a helpful post.

Show More

1 view 1 answer







Acuvue Oasys contacts?
Last Answer : Yes! I use them and I've noticed the same thing. I can't make them last as long as I used to let my other Acuvue2's, but in the end the Oasys are way more comfortable. The other thing I ... more towards the end, too. Btw: I'm not sure where you get yours, but Costco sells them really cheaply.

Show More

1 view 1 answer






Show More⇦ PreviousNext ⇨