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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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
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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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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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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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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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Apr 26, 2018
by
anonymous

Last Answer : Arc in a circuit breaker is interrupted at zero current.
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Mar 20, 2018
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anonymous

Last Answer : The arc voltage produced in A.C. circuit breaker is always in phase with the arc current.
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Mar 20, 2018
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anonymous

Last Answer : Ionization in circuit breaker is facilitated by high temperature, increase of mean free path, increasing field strength.
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Mar 20, 2018
by
anonymous

Last Answer : The voltage appearing across the contacts after opening of the circuit breaker is called recovery voltage.
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419 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : Air blast circuit breaker is used for repeated duty.
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1 answer
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Mar 19, 2018
by
anonymous

Last Answer : Magnetic circuit breaker has instantaneous trip action.
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Mar 19, 2018
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anonymous

Last Answer : Thermal circuit breaker has delayed trip action.
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Mar 19, 2018
by
anonymous

Last Answer : The arcing contacts in a circuit breaker are made of copper tungsten alloy.
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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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2 answers
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Dec 4, 2017
by
anonymous
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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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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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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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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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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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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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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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Apr 30, 2018
by
anonymous
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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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Apr 29, 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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Apr 29, 2018
by
anonymous

Basic Circuit Elements Symbols
Last Answer : Basic Circuit Elements Symbols
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Apr 5, 2020
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anonymous

Basic Circuit Elements
Last Answer : Resistance ,current,voltage
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Aug 15, 2019
by
anonymous
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basic gate drive circuit of GTO
Last Answer : basic gate drive circuit of GTO
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Nov 14, 2017
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anonymous
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How To Make Basic Liquid Gel Soap
Last Answer : 2 cups soap flakes or grated bar soap 1/2 gallon water 2 tbsp glycerin Mix ingredients together in a large pot or dutch oven. Set over low heat, stirring occasionally until the soap has dissolved. Transfer to a jar and cover tightly. For a less thick gel soap, use 1 gallon of water.
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Numbers Basic Math Review
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Feb 21, 2020
by
anonymous

Basic idea of generation
Last Answer : Prior to the discovery of Faraday's Laws of electromagnetic discussion, electrical power was available from batteries with limited voltage and current levels. Although complicated in construction, D ... Therefore, area specific generating stations along with its distribution networks had to be used.
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Aug 8, 2019
by
anonymous

What are the basic requirements of locating wind power plant ?
Last Answer : The basic requirements of locating wind power plant: 1) The site should be selected where winds are strong i.e. where pressure of wind is high and there is continuity. 2) Wind pressure ... the turbine which can affect the system's overall performance. 10)Possibility to connect to power grid.
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Aug 2, 2019
by
anonymous

Basic SI units
Last Answer : Basic SI units
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May 16, 2019
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anonymous

1.Determine the permeability of magnetic material by plotting its BH curve 2. Measure voltage, current and power in 1-phase circuit with resistive load. 3. Measure voltage, current and ... .Make Star and Delta connection in induction motor starters and measure the line and phase values.
Last Answer : Practical no. 6 Aim: Make Star and Delta connection in induction motor starters and measure the line and phase values. Apparatus required: voltmeter, ammeter, induction motor Circuit diagram ... Result: Hence we have measured the line and phase value of star and delta connection.
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6 answers
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Aug 28, 2018
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anonymous

What is the basic use of capacitor?
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Mar 15, 2018
by
anonymous

What is the basic function of a capacitor?
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Mar 15, 2018
by
anonymous

What are the four basic welding positions?
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Mar 11, 2018
by
anonymous

What are the basic laws of physics?
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Mar 11, 2018
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anonymous

What is basic insulation level?
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Mar 10, 2018
by
anonymous

Explain the basic operation of an oscilloscope with necessary diagram for each section in detail.
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Mar 2, 2018
by
anonymous

Describe the basic SHA operation with the help of its four mode specifications.
Last Answer : Sample-and-hold amplifier (SHA) is a unity gain amplifier with a mode control switch where the input of the amplifier is connected to a time-varying signal. A trigger pulse at the mode control switch ... but other forms, such as optical and mechanical forms, are possible. Also denoted S/H.
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Mar 2, 2018
by
anonymous

If the % reactance upto the fault point is 20%, then the short circuit current will be
Last Answer : If the % reactance upto the fault point is 20%, then the short circuit current will be 5 times the full load current
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May 8, 2018
by
anonymous

Which of the following circuit breakers has high reliability & minimum maintenance? (A) Bulk oil type CB (B) Air blast CB (C) Vacuum CB (D) Sulphur hexafluoride CB
Last Answer : Which of the following circuit breakers has high reliability & minimum maintenance? (A) Bulk oil type CB (B) Air blast CB (C) Vacuum CB (D) Sulphur hexafluoride CB
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300 views
1 answer
asked
May 8, 2018
by
anonymous

The following is/are the characteristics of SF6 circuit breakers: (A) It does not need an auxiliary breaking chamber (B) Short break time of 2 to 2.5 cycles (C) All of the above (D) None of the above
Last Answer : The following is/are the characteristics of SF6 circuit breakers: (A) It does not need an auxiliary breaking chamber (B) Short break time of 2 to 2.5 cycles (C) All of the above (D) None of the above
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109 views
1 answer
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May 8, 2018
by
anonymous

Last Answer : A fuse in a motor circuit provides protection against short-circuit and overload.
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157 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : Air blast circuit breakers for 400 kV power system are designed to operate in 50 millisecond.
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209 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : The short circuit in any winding of the transformer is the result of impulse voltage.
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174 views
1 answer
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Mar 20, 2018
by
anonymous
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Last Answer : The time of closing the cycle, in modern circuit breakers is 0.003 sec.
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1 answer
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Mar 20, 2018
by
anonymous

The current zero interruption, in oil and air blast circuit breakers, is achieved by?
Last Answer : The current zero interruption, in oil and air blast circuit breakers, is achieved by lengthening of the gap, cooling and blast effect.
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1 answer
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Mar 19, 2018
by
anonymous

Last Answer : Circuit breakers are essentially current carrying contacts called electrodes.
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1 answer
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Mar 19, 2018
by
anonymous

Last Answer : Circuit breakers usually operate under transient state of short-circuit current.
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1 answer
asked
Mar 19, 2018
by
anonymous
