Last Answer : The arcing contacts in a circuit breaker are made of copper tungsten alloy.
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116 views
1 answer
asked
Mar 19, 2018
by
anonymous
Last Answer : The arc voltage produced in A.C. circuit breaker is always in phase with the arc current.
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315 views
1 answer
asked
Mar 20, 2018
by
anonymous
The arc voltage in a circuit breaker is :
Last Answer : The arc voltage in a circuit breaker is : in phase with the arc current
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134 views
1 answer
asked
Apr 29, 2018
by
anonymous
The voltage appearing across the contacts after opening of the circuit breaker is called______voltage. (a) recovery (b) surge (c) operating (d) arc (e) none of the above
Last Answer : (a) recovery
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24 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
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117 views
1 answer
asked
May 8, 2018
by
anonymous
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
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637 views
1 answer
asked
May 8, 2018
by
anonymous
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
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106 views
1 answer
asked
May 8, 2018
by
anonymous
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
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161 views
1 answer
asked
May 8, 2018
by
anonymous
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)
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78 views
1 answer
asked
Apr 30, 2018
by
anonymous
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
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83 views
1 answer
asked
Apr 26, 2018
by
anonymous
Last Answer : Arc in a circuit breaker is interrupted at zero current.
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83 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : In a circuit breaker the basic problem is to transmit large power.
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121 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : Ionization in circuit breaker is facilitated by high temperature, increase of mean free path, increasing field strength.
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304 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : Air blast circuit breaker is used for repeated duty.
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78 views
1 answer
asked
Mar 19, 2018
by
anonymous
Last Answer : Magnetic circuit breaker has instantaneous trip action.
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217 views
1 answer
asked
Mar 19, 2018
by
anonymous
Last Answer : Thermal circuit breaker has delayed trip action.
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153 views
1 answer
asked
Mar 19, 2018
by
anonymous
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.
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94 views
2 answers
asked
Dec 4, 2017
by
anonymous
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.
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177 views
1 answer
asked
Mar 20, 2018
by
anonymous
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.
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152 views
1 answer
asked
Mar 19, 2018
by
anonymous
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.
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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.
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10 views
1 answer
asked
May 15, 2021
by
anonymous
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.
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13 views
1 answer
asked
May 14, 2021
by
anonymous
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.
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208 views
1 answer
asked
May 21, 2020
by
anonymous
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.
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936 views
1 answer
asked
Oct 13, 2019
by
anonymous
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.
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456 views
1 answer
asked
Sep 18, 2018
by
anonymous
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
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268 views
1 answer
asked
Apr 30, 2018
by
anonymous
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
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116 views
1 answer
asked
Apr 29, 2018
by
anonymous
A DC voltage source is connected across a series RLC circuit. Under steady-state conditions, the applied DC voltage drops entirely across the
Last Answer : A DC voltage source is connected across a series RLC circuit. Under steady-state conditions, the applied DC voltage drops entirely across the C only
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2.0k views
1 answer
asked
Apr 29, 2018
by
anonymous
What is the RMS voltage in a series RL circuit, if the voltage across R and L is 256 V and 192 V respectively? A) 320 V B) 448 V C) 64 V D) None of these
Last Answer : What is the RMS voltage in a series RL circuit, if the voltage across R and L is 256 V and 192 V respectively? A) 320 V B) 448 V C) 64 V D) None of these
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145 views
1 answer
asked
Apr 29, 2018
by
anonymous
Source transformation Replace the circuit with voltage source in series with a single resistor
Last Answer : Source transformation Replace the circuit with voltage source in series with a single resistor
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247 views
1 answer
asked
Mar 21, 2020
by
anonymous
An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be (1) unaffected (2) decreased (3) increased (4) either decreased or increased depending on the direction of the DC field
Last Answer : An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be either decreased or increased depending on the direction of the DC field
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334 views
1 answer
asked
Apr 29, 2018
by
anonymous
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A circuit that binds the upper or lower extreme of a waveform to a fixed DC voltage level is called ______ A) DC voltage restorer B) Clamping circuit C) Both A and B D) None of these
Last Answer : A circuit that binds the upper or lower extreme of a waveform to a fixed DC voltage level is called ______ A) DC voltage restorer B) Clamping circuit C) Both A and B D) None of these
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105 views
1 answer
asked
Apr 29, 2018
by
anonymous
A d.c. source has an open circuit voltage of 30 V and an internal resistance of 1.5 Ohm. A resistive load is connected to the source. Maximum power dissipated in the load is (A) 300 W (B) 150 W (C) 45 W (D) 20 W
Last Answer : A d.c. source has an open circuit voltage of 30 V and an internal resistance of 1.5 Ohm. A resistive load is connected to the source. Maximum power dissipated in the load is 150 W
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289 views
1 answer
asked
Apr 25, 2018
by
anonymous
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.
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149 views
1 answer
asked
Mar 20, 2018
by
anonymous
Refer to the circuit below. The total absorbed (consumed) power is:
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19 views
0 answers
A battery of e.m.f. 12V supplies a current of 5A for 2 minutes. How much energy is supplied in this time?
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30 views
0 answers
How should contacts feel after the second day of wearing?
Last Answer : Call the doctor’s office and describe what is happening.
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1 view
1 answer
asked
Feb 27
by
anonymous
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What is the most unusual email address you have in your email contacts?
Last Answer : Moderately sexy ninja.
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1 view
1 answer
asked
Mar 2
by
anonymous
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.
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1 view
1 answer
asked
Feb 28
by
anonymous
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.
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1 view
1 answer
asked
Feb 27
by
anonymous
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.
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1 view
1 answer
asked
Feb 27
by
anonymous
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.
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1 view
1 answer
asked
Feb 27
by
anonymous
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.
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1 view
1 answer
asked
Feb 27
by
anonymous
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.
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0 views
1 answer
asked
Feb 27
by
anonymous
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.
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1 view
1 answer
asked
Feb 27
by
anonymous
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.
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2 views
1 answer
asked
Feb 27
by
anonymous
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)
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2 views
1 answer
asked
Feb 27
by
anonymous
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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.
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1 view
1 answer
asked
Feb 27
by
anonymous
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.
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1 view
1 answer
asked
Feb 27
by
anonymous
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.
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1 view
1 answer
asked
Feb 27
by
anonymous