What kVA rating is required for a transformer that must handle a maximum load current of 8 A with a secondary voltage of 2 kV?
Anonymous Quiz
49%
16kVA
22%
8kVA
21%
4kVA
7%
0.45kVA
The primary of a transformer is connected to a 6 V battery. The turns ratio is 1:3 and the secondary load, RL, is 100ohm.The voltage across the load is
Anonymous Quiz
48%
16V
26%
5V
14%
0V
12%
8.02V
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.
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.
Magnetic flux density has the dimensions
Anonymous Quiz
27%
MI-1T-2
50%
M-1I-2T-2
17%
ML-3T-2
6%
MI-1T-3
A dynamometer wattmeter is connected in ac circuit. The measured power is
Anonymous Quiz
29%
average power
48%
Rms power
13%
peak power
10%
instantaneous power
The accuracy of measurement using CRO is about
Anonymous Quiz
17%
± 3%
43%
± 0.5%
33%
± 0.05 %
8%
± 1%
Why Oil Filtration need in Transformer?
The increasing rating requirements of this era transformers and electrical apparatus results in greater electrical stress in insulating material and fluids.
In order to handle these greater stresses, oils are required to have better dielectric strength, and lower residual water content must be maintained.
The timely and proper treatment of these insulating fluids will result in the improvement of the properties of the entire insulating system of power transformers.
The principal functions of the insulating fluid are to serve as a dielectric material and an effective coolant. To perform these functions, the insulating fluid must have specific necessary qualities at the time of initial impregnation and filling at the factory which must be maintained at the same quality level in field operation if optimum performance is to be assured.
Almost 75% of the transformer failures happen due to contaminated and deteriorated oil. It is important to filter the transformer oil. Regular maintenance is of utmost significance as it is a great financial burden to replace or repair the transformer.
Ignoring transformer oil filtering can lead to:
Arcing
Overheating, which reduces electrical efficiency as well as the life of the transformer
Corona Discharges
Decrease in insulating strength of the transformer oil, and more
The increasing rating requirements of this era transformers and electrical apparatus results in greater electrical stress in insulating material and fluids.
In order to handle these greater stresses, oils are required to have better dielectric strength, and lower residual water content must be maintained.
The timely and proper treatment of these insulating fluids will result in the improvement of the properties of the entire insulating system of power transformers.
The principal functions of the insulating fluid are to serve as a dielectric material and an effective coolant. To perform these functions, the insulating fluid must have specific necessary qualities at the time of initial impregnation and filling at the factory which must be maintained at the same quality level in field operation if optimum performance is to be assured.
Almost 75% of the transformer failures happen due to contaminated and deteriorated oil. It is important to filter the transformer oil. Regular maintenance is of utmost significance as it is a great financial burden to replace or repair the transformer.
Ignoring transformer oil filtering can lead to:
Arcing
Overheating, which reduces electrical efficiency as well as the life of the transformer
Corona Discharges
Decrease in insulating strength of the transformer oil, and more
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https://youtu.be/1a0MpY2lK9I
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What is Encoder ? (Types and Uses) हिन्दी
What is encoder? Incremental encoder and Absolute encoder |Encoder working, construction, uses, types etc|
Hello Friends is video ko dekhne ke bad apko Basic encoder ke baren mai pata lage jaise Encoder kya hota hai, kitne types ke hote hai, encoder ka working…
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Forwarded from Electrical Engineering Books (Trimurthulu N)
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