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

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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

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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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

Answer :

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

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Description :

Answer :

Arc in a circuit breaker is interrupted at zero current.

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Description :

Answer :

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

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Description :

Answer :

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

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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

Answer :

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

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Description :

Answer :

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

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227 views 1 answer
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) 

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) 

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Description :

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

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69 views 1 answer
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

Answer :

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

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Description :

Answer :

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

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Description :

Answer :

Air blast circuit breaker is used for repeated duty.

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Description :

Answer :

Magnetic circuit breaker has instantaneous trip action.

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Description :

Answer :

Thermal circuit breaker has delayed trip action.

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Description :

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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Description :

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

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Description :

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 :

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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Description :

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.

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Description :

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.

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766 views 1 answer
Description :

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.

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Description :

Basic Circuit Elements Symbols

Answer :

Basic Circuit Elements Symbols

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Description :

Basic Circuit Elements

Answer :

Resistance ,current,voltage

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basic gate drive circuit of GTO

Answer :

basic gate drive circuit of GTO

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Explain the basic operation of an oscilloscope with necessary diagram for each section in detail.

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Description :

What is the basic function of a capacitor?

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Description :

Basic idea of generation 

Answer :

Prior to the discovery of Faraday's Laws of electromagnetic discussion, electrical power was available from batteries with limited voltage and current levels. Although complicated in construction, D ... Therefore, area specific generating stations along with its distribution networks had to be used.

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Description :

What are the basic requirements of locating wind power plant ?

Answer :

The basic requirements of locating wind power plant:  1) The site should be selected where winds are strong i.e. where pressure of wind is high and there is continuity. 2) Wind pressure ... the turbine which can affect the system's overall performance. 10)Possibility to connect to power grid. 

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Description :

Electrical quantities (symbol and basic unit)

Answer :

Electrical quantities (symbol and basic unit)

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Description :

Basic SI units

Answer :

Basic SI units

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Description :

1.Determine the permeability of magnetic material by plotting its BH curve 2. Measure voltage, current and power in 1-phase circuit with resistive load. 3. Measure voltage, current and power in R-L series circuit. 4.Determine the transformation ratio (K) of 1-phase transformer. 5.Connect single phase transformer and measure input and output quantities. 6.Make Star and Delta connection in induction motor starters and measure the line and phase values.

Answer :

Practical no. 6 Aim: Make Star and Delta connection in induction motor starters and measure the line and phase values. Apparatus required:  voltmeter, ammeter, induction motor Circuit diagram ... Result: Hence we have measured the line and phase value of star and delta connection.

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Description :

What is the basic use of capacitor?

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What are the four basic welding positions?

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Description :

What are the basic laws of physics?

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Description :

What is basic insulation level?

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Description :

Describe the basic SHA operation with the help of its four mode specifications.

Answer :

Sample-and-hold amplifier (SHA) is a unity gain amplifier with a mode control switch where the input of the amplifier is connected to a time-varying signal. A trigger pulse at the mode control switch ... but other forms, such as optical and mechanical forms, are possible. Also denoted S/H.

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Description :

Answer :

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

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189 views 1 answer
Description :

Linear Algebra Problem the solution to the system of equations

Answer :

Linear Algebra Problem the solution to the system of equations https://youtu.be/y_FlupirxZM

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Description :

Answer :

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

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118 views 1 answer
Description :

Arc in a circuit behaves as?

Answer :

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

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Description :

Answer :

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

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Description :

Answer :

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

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Description :

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

Answer :

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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342 views 1 answer
Description :

In which fault the maximum short circuit current occurs?

Answer :

In three phase bolted fault the maximum short circuit occurs.

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Description :

Linear algebra problem: Rank of a matrix

Answer :

Linear algebra problem: Rank of a matrix https://youtu.be/b7tPLA3_y6Y

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Description :

The power flow problem mathematical model for a linear transmission network (A) is non-linear (B) is linear (C) considers time variation of generation (D) does not consider tap-changing transformers

Answer :

The power flow problem mathematical model for a linear transmission network is non-linear

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Description :

Answer :

No MOSFET do not have a second breakdown problem.

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Description :

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

Answer :

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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Description :

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 

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 

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159 views 1 answer
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