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The method suitable for heating of a conducting medium is

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

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1 answer 72 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

asked May 8, 2018 in Switchgear And Protection by Shimroz123
1 answer 21 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

asked May 8, 2018 in Switchgear And Protection by Shimroz123
1 answer 22 views

ln a minimum oil circuit breaker the oil is used

asked Apr 26, 2018 in Switchgear And Protection by Shimroz123
1 answer 34 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

asked May 8, 2018 in Switchgear And Protection by Shimroz123
1 answer 26 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

asked May 8, 2018 in Switchgear And Protection by Shimroz123
1 answer 25 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) 

asked Apr 30, 2018 in Switchgear And Protection by Shimroz123
1 answer 28 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

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 25 views

what is SF6 circuit breaker?

asked Dec 4, 2017 in Switchgear And Protection by Quiz
1 answer 31 views

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

asked Apr 30, 2018 in Electrical Engineering by Shimroz123
1 answer 14 views

The arc voltage in a circuit breaker is :

asked Apr 29, 2018 in Utilization of electrical energy by Shimroz123
1 answer 86 views

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

asked Sep 18, 2018 in Industry Electrical Systems-I by Shimroz123
1 answer 19 views

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

asked May 8, 2018 in Switchgear And Protection by Shimroz123
1 answer 11 views

A switch tail ring counter is made by using a single D-FF. The resulting circuit is (A) T-FF (B) D-FF (C) SR-FF (D) JK-FF

asked Apr 28, 2018 in Digital Electronics by Shimroz123
1 answer 15 views
1 answer 21 views

In which fault the maximum short circuit current occurs?

asked Mar 19, 2018 in Switchgear And Protection by Shimroz123
1 answer 36 views

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 

asked May 8, 2018 in Switchgear And Protection by Shimroz123
1 answer 22 views

A series R-L-C Circuit has a resonant frequency of 1000 Hz. If the values of R, L and C are doubled, the new resonant frequency is

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 15 views

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.

asked Apr 28, 2018 in Network Analysis by Shimroz123
1 answer 26 views

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

asked May 26, 2018 in Switchgear And Protection by Shimroz123
1 answer 15 views

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

asked Mar 25, 2018 in Network Analysis by Shimroz123
1 answer 40 views

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

asked May 8, 2018 in Switchgear And Protection by Shimroz123
1 answer 28 views

With which of the following, a circuit breaker must be equipped for remote operation ? (a) Inverse time trip (b) Time-delay trip (c) Shunt trip  (d) None of the above (e) All of the above

asked May 26, 2018 in Switchgear And Protection by Shimroz123
1 answer 27 views

The resistance of a few meters of wire conductor in closed electrical circuit is?

asked Mar 25, 2018 in Basic concepts by Shimroz123
1 answer 17 views

Time constant of a circuit is the time in seconds taken after the application of voltage to each?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 16 views

In a series resonant circuit, the impedance of the circuit is?

asked Mar 24, 2018 in Electrical Engineering by Shimroz123
0 answers 317 views

What is the use of a thyristor in a circuit?

asked Mar 19, 2018 in Thyristor by Quiz
0 answers 18 views

What is the role of a capacitor in a circuit?

asked Mar 15, 2018 in Electronics Engineering by Quiz
1 answer 33 views

What is the maximum number of circuit breakers in a panel?

asked Mar 10, 2018 in Advanced electrical power system by Quiz
1 answer 70 views

What is the purpose of a capacitor in an AC circuit?

asked Dec 16, 2017 in Flexible AC Transmission System by Quiz
1 answer 18 views

30°, 60° and 90° connections are made in a directional relay to render the relay (A) Sufficient torque under fault conditions (B) Zero torque under fault conditions (C) Current grading (D) Time grading

asked May 12, 2018 in Switchgear And Protection by Shimroz123
1 answer 49 views

In an AC. circuit, a low value of kVAR compared with kW indicates?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 25 views

If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123

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