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Electrical Engineering

Electrical engineering is a field of engineering that deals with the study and application of electricity, electronics and electromagnetism.

23,056 Questions

What is the advantage of an open delta transformer?

An open-delta connection is a method of providing a three-phase supply, using two single-phase transformers. It is particularly useful if , say, one single-phase transformer, part of a three single-phase transformers forming a three-phase transformer bank, becomes damaged -allowing the two remaining transformers to provide a temporary three-phase supply to the load.

The drawback with this connection is that the capacity of the transformer bank is reduced, and it can only provide a lower load current.

What is the service factor of motor?

service factor of motor is 1.00 or 1.15 .

almost all electric motors rated at 1.5 horsepower or more have a service factor of 1.15 or greater. a motor with a 1.00 service factor is usually a very small motor like an exhaust fan in residential bathroom. if a motor has 1.00 service factor all that means is that it can only operate at 100% of its rated amperage. a motor with a 1.15 service factor can periodically be run at 115% of its rated amperage without damaging the motor.

What is a high resistance circuit?

Answer

The resistance of a material depends on its length, cross-sectional area, and resistivity. This is expressed by the following equation:

resistance = [(resistivity x length) / cross-sectional area]

So, resistance is directly-proportional to the resistivity and length of the material, and inversely-proportional to its cross-sectional area. So a high resistance can be obtained by increasing the length of the material or by decreasing its cross-sectional area, or by choosing a material with a high resistivity.

It's also worth pointing out that resistivity is affected by temperature. For pure metals, the higher the temperature, the higher the resistivity, so the higher the resisistance. For example, a hot (i.e. an operating) tungsten lamp will have a much higher resistance than a cold tungsten lamp.

How do you calculate primary current?

If it's a step up or step down transformer and you know the secondary side current, multiply the secondary current by the turns ratio. If you know the power in the secondary winding but not the current, divide the secondary power by the secondary voltage to get the secondary current and then multiply the secondary current by the turns ratio to get the primary current. The turns ratio is the number of turns on the secondary winding divided by the number of turns on the primary winding. For a step up transformer, the turns ratio will be greater then one. If it's a step down transformer, then the turns ratio will be less than one. If you don't know the turns ratio, divide the secondary voltage by the primary voltage to get the turns ratio.

What is bus riser?

Aka: riser card. A riser card is a circuit board containing expansion slot(s) which allows expansion card(s) to be re-oriented and/or moved to another position relative to the motherboard. A typical riser card rotates an expansion card/slot through 90 degrees so that the card/slot is parallel to the motherboard. A riser card may be used to: - Rotate an expansion card through 90 degrees to face left or face right. - Shiftposition of an expansion card up and/or sideways.

Why does an ammeter have a low resistance while a voltmeter has high resistance?

I am going to assume that you mean low "resistance" in an open circuit test and are performing this with a multimeter. An ammeter works by place a very small amount of resistance in series with a circuit and then measuring the Voltage drop across the resistance. The Voltage is directly proportional to the current as given in ohms law: E = I x R If you are measuring the resistance through the ammeter it will have a very low resistance and impedance.

Difference between MS dgree versus ME degree?

The abbreviations "MS" and "ME" can refer to different contexts and have different meanings. Here are two common interpretations:

1. MS as Master of Science and ME as Master of Engineering:

  • Master of Science (MS): It is a postgraduate academic degree typically awarded in scientific or technical fields. It emphasizes research-based learning and involves a thesis or research project.

  • Master of Engineering (ME): It is a professional degree focused on practical applications of engineering knowledge. It usually emphasizes coursework and practical skills rather than research.

2. MS as Multiple Sclerosis and ME as Myalgic Encephalomyelitis:

  • Multiple Sclerosis (MS): It is a chronic autoimmune disease affecting the central nervous system. It can lead to various symptoms such as fatigue, muscle weakness, coordination difficulties, and cognitive impairments.

  • Myalgic Encephalomyelitis (ME): It is a complex chronic illness characterized by extreme fatigue, pain, cognitive difficulties, and other symptoms. It is also known as Chronic Fatigue Syndrome (CFS).

It's important to note that the abbreviations "MS" and "ME" can have other meanings in different contexts as well. The specific interpretation depends on the field or subject matter being discussed.

By : 1solutions.biz

What is Full load current in transformer?

The no-load current of a transformer is the current which is drawn from the source at rated voltage and frequency even when no actual load current is being supplied.

The no-load current is what must be drawn to overcome the inherent and unavoidable losses of the transformer's components. Those losses comprise the primary circuit's resistance (known either as the "copper losses" or as the "resistance losses") and the transformer's magnetic reluctance (known either as the "iron losses" or as the "magnetic losses").

Reluctance is the techical description given to the energy necessary to excite the magnetic circuit and overcome its hysteresis, the effects of eddy currents, etc.

For more information see the Related link shown below.

When did Andre Marie ampere invent the ampere?

Andre Ampere didn't 'invent' the ampere. The unit for current was named many years after the death of Ampere, in his honour. The ampere is defined in terms of its magnetic effect -i.e. the resulting force between two, parallel, current-carrying conductors. It was Ampere who discovered the relationship between current and force.

How the current carrying capacity of acsr zebra conductor?

The Bersimis ACSR Conductor have the Current Carrying Capacity 1359.6A. It is rated at stranding (Alluminium/Steel) 42/7 and Resistance DC 20 degree Celcius per 1000ft. 0.013Ω.

How can avoid information overload while reading if you?

break down the information you receive into smaller pieces.

What are the methods of mounting and securing electrical equipments to various surfaces?

Will depend on the surface. It may be nailed, secured with screws and drywall anchors, nailed with a power nailer to concrete or block, attached to bolts set into concrete, etc.

What is reactance?

The influence of a coil of wire upon an alternating current passing through it, tending to choke or diminish the current, or the similar influence of a condenser; inductive resistance. Reactance is measured in ohms. The reactance of a circuit is equal to the component of the impressed electro-motive force at right angles to the current divided by the current, that is, the component of the impedance due to the self-inductance or capacity of the circuit.

How is electricity generated by a generator?

Energy doesn't 'take place'. Until you become more comfortable with it, you

should think of it as some kind of fluid, that flows from place to place, and can

be stored in several ways for when it's needed.

An electric generator is a machine that has a shaft and two terminal connections.

It can supply electrical energy through the terminals when you spin the shaft.

You just have to find something else that has energy, and skim energy off of

that to spin the shaft of the generator. Some possibilities are:

-- wind turning a windmill coupled to the shaft

-- water falling through vanes on the shaft

-- fire boiling water and blowing the steam through vanes on the shaft

-- uranium in a nuclear reactor getting hot and boiling water and blowing the steam through vanes on the shaft

-- a person pedaling an exercise bike coupled to the shaft

-- 400 hamsters running on a treadmill coupled to the shaft.

In every case, it takes 'kinetic energy' to spin the shaft, and the generator

converts that kinetic energy into electrical energy.

How is current measured in a series circuit?

Current is measured in a series circuit by the use of a multimeter. First, the power source must be attached to the circuit board. The board is attached to the multimeter, then that is attached back to the power source.

Answer

Current is measured either with an ammeter, or with a multimeter set to measure current. The instrument must be connected in series with the other components in the circuit.

How a zener diode can be used as a voltage regulator?

A: A zener diode is manufacture to reverse breakdown at a certain voltage this voltage will remain almost constant no matter how much more voltage is available [within operating parameters]. this zener must be able to sustain both itself operating currents plus the load

When was engineering invented?

i dont know when it was invented but the first engineering department was introduced for defense purpose

Answer

Engineering wasn't 'invented'; it evolved over time -probably reaching its peak during the Industrial Revolution.

How do you start a DC motor if there is no 3 point starter?

By the use of auto transformer and bridge rectifier we can start dc motor.

What two logical operators perform short-circuit evaluation?

In many languages both AND and OR operators perform short-circuit evaluation.

What is the Working principle of proximity sensor?

there are different types of proximity sensors namely inductive capacitance and infrared. the working principle of inductive proximity sensor is,

it consists coil, oscillator, detector and trigger circuit. when current flows through a coil magnetic field will be generated and when the metal get contact with that field

the voltage is induced in the metal the detector detects this loss in voltage and triggering circuit will give the contact output...

praveen achalkar

MCF mangalore