EEE General Knowledge-Electric brain

EEE General Knowledge - Electric brain

Electric Brain: Without electricity, we would be unable to feel anything! There is in the human body
Continuous flow of electric current through our nerve cells. So nerve cells transmit messages to the brain, And we know that our back hurts, or Someone standing on our foot. In its turn, the brain uses these tiny electric streams to send commands to other our body. Your hand turns the page when Brain ordered him to do so.

  

How is electricity measured?

How is electricity measured?

Voltage is the measure of the power of electric current. Measurement unit power is volts. Voltameter tells us how many electrons are sent from one end of cycle and some were in at the other end. The distance electricity travels affects its quality, especially if it is prevented free flowing because of the opposition.

Resistance is the resistance of the material the flow of electric current through it. Resistance measured in Ohms. Scientists always looking for materials like copper, that are good conductors of electricity and have low resistance. Silver is the best conductor, But it can not be used in our homes strings because it is too expensive. Most metals are good conductors.

EEE General Knowledge- What is electricity

Electrical And Electronics Short Questions Answers

What is electricity:

All are made of atoms. In central atom is the nucleus may protons and neutrons. Tiny atom also has electrons spin around the nucleus. Electrons have a negative charge,and have positively charged protons.Electrons do not stay in one place. They move around different atoms so that some atoms has more protons, some have more Electrons. Sealed with more protons is positively charged. With more electrons Is negatively charged. When electrons move from one atom to another, it creates electric current.

EEE General Knowledge -Who discovered electricity

Electrical And Electronics Basic Questions Answers

Who discovered electricity:

The ancient Greeks knew that electricity can  be produced by rubbing two pieces felt together. But the first use of the word Power was by Sir Thomas Browne in which 1646 Book Pseudodoxia Epidemica (vulgar Errors). In 1752, Benjamin Franklin proved Lightning created by electrical charges.He tied an iron key kite string during Storm and showed that lightning struck Key. For this reason, he said Franklin has Discovered electricity. Today, we know that Lightning is the most common form of saw Natural Power. It is caused by clouds Encountering bears a negative charge to Positively charged objects on earth. 

Electrical Electronics Engineering MCQ Job Interview MCQ Questions Answers 5

Electrical Electronics Engineering  Job Interview MCQ 5

1.       As the temperature of a metallic resistor is increased the product of its resistivity and conductivity remain constant.

2.       The resistance of human body is about 1000 ohms.

3.       The filament of an electric bulb is made of tungsten.

4.       The hot resistance of electric bulb’s filament is higher than its cold resistance because the temperature co-efficient of filament is positive.

5.       A nichrome wire used as a heater coil has a resistance of 2 ohms/m .For a heater of 1 kW at 200 V, the length of the wire required is 20m.

6.       When 1 V is applied in a circuit a current of 1u A flows through it. The conductance of the current is 1 u mho.

Basic Electrical Engineering MCQ 4- Job Interview MCQ Questions Answers

Electrical Electronics Engineering Job Interview MCQ Questions Answers 4

 

1.       An electric heater is marked 2000 W,200 V. The resistance of the coil is 20 ohm.

2.       The current in a circuit having constant resistance is tripled. The power increases 9 times.

3.       What voltage drop will be there across a 1 kW electric heater whose resistance when hot is 40 Ohms?  Ans: 200 V

4.       In the case of liquids, ohms law is fully obeyed.

5.       A copper wire has a resistance of 10 ohms. It is stretched by one-tenth of its original length. Then its resistance will be - 12.1 ohms.

6.       No current flows between two charged bodies if they have same potentials.

7.       Best materials for making connecting wires-  copper

8.       The specific resistance of the material of wire depends on the material out of which the wire is made.

9.       Ampere- second is the unit of Charge.

10.   The percentage by which the incandescence of lamp decreases due to drop of current by 3% is-6%.

Electrical Materials Conductor-Semiconductor-Insulator

Electrical Materials: Conductor-Semiconductor-Insulator

Electrical Materials divided into three major parts:

                   1.Conductor 2. Semiconductor 2. Insulator

      

    1. Conductor:

     a. Conductor generated by metallic bonds. These bonds are based on the structure of the metal positive ions surrounded by a cloud of electrons.

     b. Conductors have a positive temperature coefficient of resistance. Resistance will increase with increasing      temperature.

     c. Conductors are used for carrying current in circuits.

    2. Semiconductors:

      a. Semiconductors are created by covalent bonds.

      b. Semiconductors have a negative temperature coefficient of resistance. Their resistance decreased with increasing temperature.

      c.Semiconductors used in the manufacture of electronic devices. [For example, crystal diodes, etc Transistor]

    3. Insulators:

     a. Insulators are mainly covalent compounds.

     b. I have isolated a negative temperature coefficient of resistance, their resistance decreases with increasing temperature.

     c. Insulators are used to limit the current path you want.

Electrical Engineering mcq- Basic Concept MCQ 3

Electrical Engineering- Basic Concept MCQ3

1.       The SI unit of conductivity is mho/m.

2.       The value of α (temperature co-efficient of resistance) depends upon nature of the material and temperature.

3.       At 0 K, germanium behaves as an insulator.

4.       The example of non-ohmic resistance is carbon resistance.

5.       If an electric current is passed through a nerve, the man begins to weep.

6.       A copper wire is stretched so that its length is increased by 0.1%. The change in its resistance is  0.2%.

7.       The best conductor of electricity silver.

8.       Ampere-hour is the unit of quantity of electricity.

9.       The resistance decrease with increase temperature Carbon.

10.   A wire having very high value of conductance is said to be very good conductor.