Please Log in or Register for more.


304 views

1 Answer

Answer :

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

Like 0 like

Please log in or register to answer this question.

Related Questions


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

161 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

83 views 1 answer








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

Show More

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

Show More

418 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

153 views 1 answer








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

Show More

116 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

94 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

13 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

208 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

936 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

456 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

116 views 1 answer







Ionization in circuit breaker is facilitated by (a) high temperature (b) increase of mean free path (c) increasing field strength (d) all of the above
Last Answer : (d) all of the above

Show More

29 views 1 answer







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

Show More

3.0k views 1 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 
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 

Show More

296 views 1 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
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

Show More

108 views 1 answer








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

Show More

157 views 1 answer








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

Show More

209 views 1 answer








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

Show More

174 views 1 answer








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

Show More

123 views 1 answer







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.

Show More

437 views 1 answer








Last Answer : Circuit breakers are essentially current carrying contacts called electrodes.

Show More

327 views 1 answer








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

Show More

104 views 1 answer







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

Show More

284 views 1 answer







In which fault the maximum short circuit current occurs?
Last Answer : In three phase bolted fault the maximum short circuit occurs.

Show More

130 views 1 answer







Can An Rc Circuit Be Used As Clock Source For 8085?
Last Answer : Answer :Yes, it can be used, if an accurate clock frequency is not required. Also, the component cost is low compared to LC or Crystal.

Show More

55 views 1 answer







What is the purpose of Overload Protection in a motor circuit?
Last Answer : Ans. The Overload Protection is used in a motor circuit to protect it from sustained over currents.

Show More

54 views 1 answer







microproject on synchronised UJT triggring circuit

Show More

9 views 0 answers







How to Do Circuit Training
Last Answer : How to Do Circuit Training Circuit exercise is a set of exercises designed to burn as much calories as possible while integrating and engaging different kinds of movements all over your body. After finishing ... up your stamina to be able to finish five circuits in a session, so pace yourself.

Show More

4 views 1 answer







Refer to the circuit below. The total absorbed (consumed) power is:

Show More

19 views 0 answers







Draw the circuit diagram of battery charger using SCR and explain it’s working.
Last Answer : Battery charger circuit using SCR: The figure shows the battery charger circuit using SCR. A 12V discharged battery is connected in the circuit and switch SW is closed. The singlephase 230V ... not fired. In this way, after full charging, further charging is automatically stopped.

Show More

535 views 1 answer







With neat diagram explain synchronized UJT triggering circuit.
Last Answer : Line Synchronized UJT triggering circuit: The UJT is almost ideal as a firing device for SCRs. There are 2 main reasons for the compatibility between UJTs and SCRs. Firstly, the UJT produces a ... , the SCR is sure to have the right polarity between the anode and cathode for turning on.

Show More

566 views 1 answer







Draw circuit diagram of symmetrical configuration of bridge converter.
Last Answer : circuit diagram of symmetrical configuration of bridge converter

Show More

83 views 1 answer







Draw circuit diagram of Class B commutation.
Last Answer : Class B: Resonant Pulse Commutation:

Show More

116 views 1 answer







Equivalent circuit of transformer
Last Answer : Equivalent Circuit Diagram of Transformer Referred to Primary: V1 -Primary Input voltage I1 - Input Current I0- Exciting current/ No load current Im- Magnetizing component ... equivalent of secondary terminal voltage ZL- Load impedance ZL ′- Primary equivalent of load impedance

Show More

381 views 2 answers







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. 

Show More

178 views 1 answer







Draw equivalent circuit of alternator.
Last Answer : Equivalent circuit of alternator

Show More

254 views 1 answer







Why does leakage occur in a magnetic circuit?

Show More

121 views 0 answers






Show More⇦ PreviousNext ⇨