Which of the following is used in a circuit breaker as the medium in which the arc forms?

Question

Which of the following is used in a circuit breaker as the medium in which the arc forms?

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

asked Apr 29, 2018 by anonymous

1 Answer

Related questions

The arc temperature in Oil Circuit Breaker may reach up to_______.

Description : 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

The arc voltage in a circuit breaker is :

Description : The arc voltage in a circuit breaker is :

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

Arc in a circuit breaker is interrupted at?

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

The arc voltage produced in A.C. circuit breaker is always?

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

Arc in a circuit behaves as?

Description : Arc in a circuit behaves as?

Last Answer : Arc in a circuit behaves as a resistance decreasing with voltage rise across the arc.

Breaking capacity of a circuit breaker is usually expressed in terms of

Description : 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

Explain about Circuit Breaker

Description : 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.

How to Reset a Circuit Breaker

Description : 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.

How to Install a Circuit Breaker

Description : 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.

Explain working of static AC circuit breaker.

Description : 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.

Explain working of AC circuit breaker using SCR with circuit diagram.

Description : 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.

State function of starter and ELCB. (Earth Leakage Circuit Breaker)

Description : 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.

The number of cycles in which a high speed circuit breaker can complete its operation is

Description : 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

A circuit breaker is designed to protect an electrical circuit from damage caused by :

Description : 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

The Minimum Oil Circuit Breaker (MOCB) is named because of :

Description : 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

For selecting a circuit breaker, ______ should be determined.

Description : 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)

ln a minimum oil circuit breaker the oil is used

Description : 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

In a circuit breaker the basic problem is to?

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

Ionization in circuit breaker is facilitated by?

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

The voltage appearing across the contacts after opening of the circuit breaker is called______voltage.

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

Air blast circuit breaker is used for?

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

Magnetic circuit breaker has ______ trip action.

Last Answer : Magnetic circuit breaker has instantaneous trip action.

Thermal circuit breaker has?

Last Answer : Thermal circuit breaker has delayed trip action.

The arcing contacts in a circuit breaker are made of?

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

what is SF6 circuit breaker?

Description : 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.

Write the purpose of coal and ash handling unit. Also write different activities that arc carried out in this unit.

Description : Write the purpose of coal and ash handling unit. Also write different activities that arc carried out in this unit.

Last Answer : Purpose of coal and ash handling unit :- To transport coal from coal storage to power plant. A large quantity of ash about 10 to 30 % produced in furnace, the removal of ash from boiler furnace ... disposed off. Various methods of disposal of ash: Mechanical system. Pneumatic system.

What should I get for my first welder, arc or stick?

Description : What should I get for my first welder, arc or stick?

Last Answer : ‘pends, I think you should get the arc.

Compare the AC and DC Arc lamps.

Description : Compare the AC and DC Arc lamps.

Last Answer : AC Arc Lamp DC Arc Lamp Cross section area of electrode is same Cross section area of electrode is positive rod is twice that of negative rod Series inductor is used for stability ... supply is used for DC arc lamp Luminous efficiency is less Luminous efficiency is high

Compare between Resistance welding and Arc welding on any six points.

Description : Compare between Resistance welding and Arc welding on any six points.

Last Answer : Sr.No Parameters Resistance Welding Arc Welding 1 Type of welding Plastic/Pressure/Non-fusion welding Fusion/Non pressure welding 2 Principle of heat developed Heat ... It is suitable for mass production It is suitable for heavy job, maintenance and repair work

Arc resistance

Description : Arc resistance (1) increases with increase in arc current (2) decrease with increase in arc current (3) is independent of arc current (4) is independent of arc length

Last Answer : Arc resistance decrease with increase in arc current

For arc welding current range is usually

Description : For arc welding current range is usually (1) 10 to 15 A (2) 30 to 40 A (3) 50 to 100 A (4) 100 to 350 A

Last Answer : For arc welding current range is usually 100 to 350 A

Identify the correct combination of respective Electric arc welding and Electric resistance welding methods :

Description : Identify the correct combination of respective Electric arc welding and Electric resistance welding methods : (A) Butt welding and Seam welding (B) Hydrogen shielding and Projection welding (C) Seam welding and Coated electrode welding (D) Coated electrode welding and Hydrogen shielding

Last Answer : Identify the correct combination of respective Electric arc welding and Electric resistance welding methods : (A) Butt welding and Seam welding (B) Hydrogen shielding and Projection welding ... Seam welding and Coated electrode welding (D) Coated electrode welding and Hydrogen shielding

The supply for arc welding is :

Description : The supply for arc welding is :

Last Answer : The supply for arc welding is : Low voltage, high current ac or dc voltage

Why my "send to a friend form" only works in safari?

Description : Why my "send to a friend form" only works in safari?

Last Answer : I would start debugging this by creating one simple email form which I was able to verify working across all browsers, then gradually add snippets of the above code until it stopped working, ... your code, my first suspects would be the multiple-lined $email_text variable, followed by the accents.

Which of the following medium is employed for extinction of arc in air circuit breaker ? (a) Water (b) Oil (c) Air (d) SF6

Description : Which of the following medium is employed for extinction of arc in air circuit breaker ? (a) Water (b) Oil (c) Air (d) SF6

Last Answer : (c) Air

Which of the following medium is employed for extinction of arc in air circuit breaker ?

Description : Which of the following medium is employed for extinction of arc in air circuit breaker ?(a) Water (b) Oil(c) Air (d) SF6

Last Answer : Which of the following medium is employed for extinction of arc in air circuit breaker ?(a) Water (b) Oil(c) Air (d) SF6

Briefly explain how the power factor of an inductive circuit can be improved.

Description : Briefly explain how the power factor of an inductive circuit can be improved.

Last Answer : As we know that power factor should be corrected to ensure that the current supplied is cost friendly. Meaning the power factor should be around one but not greater than one(0.8-0.9) in a ... an inductive circuit due to the inductive reactance which oppose the change of current in the ac circuit.

Time constant of a capacitive circuit

Last Answer : It is denoted as τ, tau and has the value of 1/RC. We

role of tuned LC circuit in tuned amplifier.

Description : role of tuned LC circuit in tuned amplifier.

Last Answer : In order to pick up and amplify the desired radio frequency signal, the resistive load in the audio amplifier is replaced by a tuned circuit (also called a parallel resonant circuit)as shown ... desired radio frequency signal. (ii)Amplification of the selected signal to a suitable voltage level.

State Ohm’s law for electric circuit.

Description : State Ohm’s law for electric circuit.

Last Answer : Ohms law -States that the current flows in a circuit is directly proportional to the applied voltage (V) and inversely the proportional resistance provided with the temperature main constant

Define active circuit and passive circuit.

Description : Define active circuit and passive circuit.

Last Answer : Active circuit: Active Circuit is one which contains at least one source of e.m.f. or energy, is called active circuit. Passive Circuit: Passive Circuit is one which does not contain any source of e.m.f. or energy in it, is called passive circuit.

Basic Circuit Elements

Description : Basic Circuit Elements

Last Answer : Resistance ,current,voltage

A supply of 24 V DC is applied across a circuit which consist of three resistors connected in parallel R1= 1.2KΩ, R2= 560 Ω, R3= 2.1Ω and a fourth resistor of 7.8 Ω connected in series with the parallel group. Determine the current, voltage and power across each resistor

Last Answer : Req= (1/1200 +1/560 + 1/2.1)^-1 = 2.1 ohms RT= 2.1 + 7.8 = 9.9 ohms IT = V/R = 24/9.9 = 2.4 A Veq= R I = 2.1 2 ... 7.8 = 12.096 w = 44.928 w _________________________________________ By: Ellis-Junior Kamatjipose [email protected]

Compare combinational logic circuit and sequential logic circuit

Description : Compare combinational logic circuit and sequential logic circuit

Last Answer : Combinational logic Sequential logic The combinational logic circuit consists of logic gate only Sequential logic circuit consists of combinational logic circuit along with memory for storage of ... , multiplexer, demultiplexer etc E.g. counters, shift registers flip-flop etc

What is unilateral and bilateral circuit?

Description : What is unilateral and bilateral circuit?

Last Answer : Unilateral Circuit: If the characteristic (response or behavior) of circuit depends on the direction of flow of current through its elements, then the network is called as a unilateral network. ... the direction of current through its elements, then the network is called as a bilateral network.

Describe the difference between an open circuit and a short circuit.

Description : Describe the difference between an open circuit and a short circuit.

Last Answer : Open circuit means the wire is cut meaning power will not flow and close circuit means wire is not cut and hence power will flow.Short circuit is the same as close circuit

Series circuit rules

Description : Series circuit rules

Last Answer : Series circuit rules

Parallel rc circuit

Description : Parallel rc circuit

Last Answer : Parallel rc circuit

Parallel circuit rules

Description : Parallel circuit rules

Last Answer : Parallel circuit rules