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Arc in a circuit behaves as?
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Arc in a circuit behaves as a resistance decreasing with voltage rise across the arc.
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Arc in a circuit breaker is interrupted at zero current.

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

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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

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The arc temperature in Oil Circuit Breaker may reach up to 5,000° K 

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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

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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The arc voltage in a circuit breaker is :

Answer :

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

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Description :

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

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.

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Compare the AC and DC Arc lamps.

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

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

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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

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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

Answer :

Arc resistance decrease with increase in arc current 

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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

Answer :

For arc welding current range is usually 100 to 350 A

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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

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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

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The supply for arc welding is : 

Answer :

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

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At very low frequencies a series R-C circuit behaves as almost purely?

Answer :

At very low frequencies a series R-C circuit behaves as almost purely capacitive.

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At ______ frequencies the parallel R-L circuit behaves as purely resistive.

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At very high frequencies the parallel R-L circuit behaves as purely resistive.

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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

Answer :

The number of cycles in which a high speed circuit breaker can complete its operation is 3 to 8

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A fuse in a motor circuit provides protection against short-circuit and overload.

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

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

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Air blast circuit breakers for 400 kV power system are designed to operate in 50 millisecond.

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The short circuit in any winding of the transformer is the result of impulse voltage.

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The time of closing the cycle, in modern circuit breakers is 0.003 sec.

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

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The current zero interruption, in oil and air blast circuit breakers, is achieved by?

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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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In which fault the maximum short circuit current occurs?

Answer :

In three phase bolted fault the maximum short circuit occurs.

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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

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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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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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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ln a minimum oil circuit breaker the oil is used

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

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If the % reactance upto the fault point is 20%, then the short circuit current will be

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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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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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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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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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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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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

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

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

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Air blast circuit breaker is used for repeated duty.

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Circuit breakers are essentially current carrying contacts called electrodes.

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Circuit breakers usually operate under transient state of short-circuit current.

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Magnetic circuit breaker has instantaneous trip action.

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Thermal circuit breaker has delayed trip action.

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what is SF6 circuit breaker?

Answer :

A circuit breaker in which SF6 under pressure gas is used toextinguish the arc is calledSF6 circuit breaker. SF6 (sulphur hexafluoride) gas has excellent dielectric , arc quenching, chemical and other physical properties and has proved its ...

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

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

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The circuit whose properties are same in either direction is known as?

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The circuit whose properties are same in either direction is known as bilateral circuit.

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Define Multivibrator. State the types of multivibrator. Which M/V can be used as a flip-flop? Draw the circuit diagram.

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Which of the following are known as the short circuit parameters of a 2- port network? (A) Z- parameters. (B) H- parameters. (C) Y- parameters. (D) A,B,C,D, parameters.

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Which of the following are known as the short circuit parameters of a 2- port network? (A) Z- parameters. (B) H- parameters. (C) Y- parameters. (D) A,B,C,D, parameters.

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Which circuit is used as amplitude comparator?

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Schmitt trigger circuit is used as amplitude comparator.

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The circuit has resistors, capacitors and semi-conductor diodes. The circuit will be known as

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The circuit has resistors, capacitors and semi-conductor diodes. The circuit will be known as non-linear circuit.

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The time constant of the capacitance circuit is defined as the time during which voltage?

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The time constant of the capacitance circuit is defined as the time during which voltage rises to 63.2% of its final steady value.

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Why does leakage occur in a magnetic circuit?

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Design a temperature detecting circuit  assuming a linear temperature (T, in degree Celsius) detecting signal in Voltage (mV)  V = 0.2 + 0.1 * T  T is from 10 (oC) to 80 (oC)  Design an amplifying circuit based on MOSFETs.  Output voltage should be larger than 0.5V  The output voltage should be linear with ... you show detail about how to detect the temperature, how the circuit work, restriction,...  really need the PSPICE circuit and how to simulation.  Thank you so much!

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Answer :

Source transformation Replace the circuit with voltage source in series with a single resistor

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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]

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Explain why potential difference is necessary to produce current in a circuit.

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