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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 difference between metallic and non-metallic cable?

There is a big difference between Non-metallic minerals and metallic minerals.Metallic minerals are composed primarily of metallic elements and have a metallic lustre and other properties, such as the ability to conduct electricity. Non-metallic minerals do not have these characteristics

Which wire will be connect at NO or NC contact?

NO stands for Normally Open and NC is Normally Closed. It references a switching application. It is the base state of the switch. So if the load is connected to the NC terminal it will usually be energized and when the switching device is activated the circuit will open and the load will be de-energized.

The NO terminal would have the load de-energized until the switch was activated and then it would be energized.

When does an electric motor develop maximum torque?

An electric motor develops maximum torque at or near standstill, which is when the motor is starting to turn from a complete stop. This is due to the fact that torque is directly related to the current flowing through the motor, and at standstill, the motor can draw maximum current, resulting in maximum torque. As the motor speed increases, the back electromotive force (back EMF) rises, reducing the current and, consequently, the torque.

What is auto fill write down its step?

Autofill is a feature in software applications that automatically completes data entries based on previously entered information. To use autofill, first, enter a value in a cell (like in a spreadsheet). Then, click and drag the fill handle (a small square at the bottom-right corner of the cell) over the cells you want to populate. The application will automatically fill those cells with sequential data or replicate the original entry as needed.

Why on load or off load tap changer is always connected in the primary side of a power or distribution transformer. And why distribution and power transformer are rated MVA?

The size of any switch depends on current it carries. Your statement is true for step down transformers. The primary is HV hence less current, so the tap changer is on primary side.

Describe the properties and an application of two different mangntic materials commonly used in electrical and electronic engineering?

Yes very important, wheels on car are spun on very hard steel die's not aluminum, the properties of the two metals are very different, one is soft and the other is hard, (the wearing-out of the metals with extended use). also how materials interact with each other as in coexistance and enhancement. many things swell and shrink with heat and cold, linen is easier to sew then fleese, patternmakers must take in all factors concerning the product the're working with.

What are the advantages of 750Kv high voltage?

A high voltage like 750kV is used in transmission lines because this reduces the current in the wires for a given amount of power. A reduced current will reduce the power lost in transmission (I^2R).

Comment

Far more importantly than reducing line losses, it reduces the voltage drop along the line which would, otherwise, be enormous!

What does in phase mean?

If you have two waves, or two things in oscillation or two things in vibration; if the peaks (maximum amplitude) and valleys (maximum amplitude the other way) occur at the same time then they are in phase. If one wave peaks at the same time the other one is in a valley they are said to be 180 degrees out of phase.

What digital multimeter scale should be used when testing the signal from a Hall-effect switch?

You should use the scale that shows correctly your supply voltage.

Most Hall-effect switches provide either a logical output or an open-collector output.

If the output is logical, you can expect the value to be between 0 and your supply voltage.

If the output is open-collector, you must bias the output to your supply voltage with a resistor; otherwise you will always read "0". If biased, the output will be between 0 and the voltage bias.

If you are not certain of which type you have, try finding the datasheet on the Internet; otherwise, you can always bias the output to your supply voltage; if you properly choose the resistor, it should not adversely affect the behaviour of the logical-level output.

I would suggest trying 1 kOhm with a 5 V supply; this gives a bias current of 5 mA, which most Hall-effect sensors should be able to cope with.

There are other Hall-effect sensors that provide linear output, but this answer is about a Hall-effect switch.

What is meant by a mandatory field?

a mandatory field in a database is one created in a table as "Not null". This means, there is a "rule" on the field that when data is inserted into the table, this field cannot be empty. If it is, then the insert errors. Here's part of a table definition in my database. These field are are required to be populated when inserting into this table. ATTR_DESC_01 CHAR(2) DEFAULT SYSTEM NOT NULL
, ATTR_DESC_02 CHAR(2) DEFAULT SYSTEM NOT NULL
, ATTR_DESC_03 CHAR(2) DEFAULT SYSTEM NOT NULL
, ATTR_DESC_04 CHAR(2) DEFAULT SYSTEM NOT NULL
, ATTR_DESC_05 CHAR(2) DEFAULT SYSTEM NOT NULL
, ATTR_DESC_06 CHAR(2) DEFAULT SYSTEM NOT NULL
, ATTR_DESC_07 CHAR(2) DEFAULT SYSTEM NOT NULL
, ATTR_DESC_08 CHAR(2) DEFAULT SYSTEM NOT NULL
, ATTR_DESC_09 CHAR(2) DEFAULT SYSTEM NOT NULL
, ATTR_DESC_10 CHAR(2) DEFAULT SYSTEM NOT NULL
, PARTITION_NBR SMALLINT NO DEFAULT NOT NULL
)

Is power real?

powers are real cause god has powers and the prophets but u can think what u think cause i think they're real

How can you connect resistors to produce an equivalent resistance which is the same as the resistance of each individual resistor?

You can connect 4 resistors in series-parallel, i.e. two in series, both in parallel with another two, and the effective resistance would be the same as one resistor. Similarly, you can connect nine resistors in 3x3 series-parallel, or 16 resistors in 4x4 series-parallel, etc. to get the same resistance of one resistor.

Is nchsoftware safe for down load?

Not sure if it's safe but,

NCH Software is Bloody annoying. It will freeze randomly sometime when you JUST start it. You will get very frustrated. trust me.

What will happen if 5 volts is connected to a 3 volts device?

It depends. In some cases it may destroy some components. Depends on application and rating of components in use.

What is a contact resistor?

A: I snot a resistor but rather an unwanted resistance on a contact

How many phases are in ac electric?

A.C. is generated, transmitted, and distributed as three phase.

What is the formula for power in terms of amperes?

Electrical power = current x voltage

Current is in amps

What are the properties of commutation?

Commutation refers to the ability to change the order of operations without affecting the outcome. In mathematics, particularly in addition and multiplication, this is represented by the commutative property: for any numbers (a) and (b), (a + b = b + a) and (a \times b = b \times a). Commutation is also relevant in quantum mechanics, where operators that commute share eigenstates and can be simultaneously measured without uncertainty. Overall, commutation highlights the flexibility of operation order in certain mathematical and physical contexts.

Definition of troubleshooting of vehicle?

aah troubleshooting a vehicle is when your too drunk to hold the gun straight. then your having troubleshooting a vehicle.