Recent questions tagged breaker

by itszee asked Jun 20, 2021 0 views

Explain about Circuit Breaker
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....

by anonymous asked May 15, 2021 0 views

How to Reset a Circuit Breaker
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....

by anonymous asked May 14, 2021 0 views

How to Install a Circuit Breaker
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....

by anonymous asked May 21, 2020 156 views

Explain working of static AC circuit breaker. 
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. ...

by anonymous asked Oct 13, 2019 784 views

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

by anonymous asked Sep 18, 2018 412 views

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

by anonymous asked May 8, 2018 94 views

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

by anonymous asked May 8, 2018 523 views

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 ...

by anonymous asked May 8, 2018 90 views

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 ...

by anonymous asked May 8, 2018 128 views

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

by anonymous asked Apr 30, 2018 180 views

Breaking capacity of a circuit breaker is usually expressed in terms of  (1) Ampere (2) Volts (3) MW (4) MVA
Answer : Breaking capacity of a circuit breaker is usually expressed in terms of MVA ...

by anonymous asked Apr 30, 2018 65 views

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) 
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)  ...

by anonymous asked Apr 29, 2018 88 views

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

by anonymous asked Apr 29, 2018 91 views

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 ...

by anonymous asked Apr 26, 2018 71 views

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

by anonymous asked Mar 20, 2018 73 views

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

by anonymous asked Mar 20, 2018 207 views

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

by anonymous asked Mar 20, 2018 113 views

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

by anonymous asked Mar 20, 2018 231 views

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

by anonymous asked Mar 20, 2018 322 views

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