PLC (Programmable logic controller)

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Interview questions

1) What happens when two positively charged material is placed together?

When two positively charged material place together it will repel.

2) What is referred to the electron in the outer orbit?

Electron in the outer orbit is known as valence.

3) Define the term Capacitance and Inductance?

Capacitance: It is the amount of charge that is stored inside a capacitor at a given voltage.

Inductance: It is defined as the property of a coil to resist any changes in electric current flowing through it. Mutual inductance happens when a secondary coil opposes current change in the primary coil.

4) Mention what is the difference between generator and alternator?

Both generator and alternator work on the same principle they convert mechanical energy into electrical energy.

Generator: It converts induced emf (Electro Motive Force) into direct current, where it based on stationary magnetic field and revolving conductor which rolls on the armatures with slip rings and brushes riding against each other.

Alternator: It has rotating magnetic and stationary armature for high voltage and stationary magnetic field and a rotating armature for low voltage

5) Mention what are the different kind of cables used for transmissions?

Cables are categorized into three forms according to its thermal capacity

Low tension cables- transmits voltage upto 1000 volts

High tension cables- transmits voltage up to 23000 volts

Super tension cables- transmits voltage up to 66kv to 132kv



6) Mention what are the different colors on wires indicates?

This is a must know question for any good Electrical Engineer

Black wire: This wire is used for power supply in all circuits. Any circuits with this color is considered hot or live. It is never used for a neutral or ground wire.

Red wire: This color wire is a secondary live wire in a 220 volt circuit and used in some types of interconnection. You can join the red wire to another red wire or to a black wire

Blue and Yellow wire: These wires are also used to carry power but are not wiring the outlets for common plug-in electrical devices. They are used for the live wire pulled through the conduct. You will see yellow wire in the fan, structure lights, and switched outlets.

White and Gray: This color wire is used as a neutral wire. It carries the current (unbalanced load) to the ground. You can join white and gray only to other white and gray wires

Green: It is connected to the grounding terminal in an outlet box and run from the outlet box to the ground bus bar within an electric panel

7) Explain RLC circuit?

An RLC circuit carries an electrical circuit consisting of a resistor (R) and inductor (L) and a capacitor (C), connected in parallel or series. This circuit is called a second order circuit as any voltage or current in the circuit can be described by a second order differential equation.

8) Explain how you decide what size of electrical wire do you need?

Wire is sized by American Wire Gauge system. Your installation of conductors will depend on a few factors like gauge of the wire, wire capacity, etc. For wires, smaller the wire gauge larger the ampacity or capacity of the wire to handle current. For example, low voltage lighting and lamp cords will have 18 gauge, electric furnaces or large electric heaters are of 6 gauge.

9) Mention what are the types of semi-conductors?

There are two types of semi-conductors intrinsic and extrinsic. Again in extrinsic semi-conductors you will have N-type semiconductors and P-type semiconductors.

10) Explain what is transistors comprised of?

Transistors are comprised of several combination of n-type and p-type semi-conductors.

11) Mention what is the role of transistor in Circuit?
Transistor has the ability to amplify the current, due to the reason that output power can be higher than the input power.