Interview Questions.

Q1. Operation Carried Out In Thermal Power Stations?

The water is acquired within the boiler and the coal is burnt in order that steam is received this steam is authorized to hit the turbine , the turbine which is coupled with the generator generates the electricity.

Q2. What Is Marx Circuit?

It is used with generators for charging a number of capacitor in parallel and discharging them in collection.It is used when voltage required for testing is better than the to be had

Q3. Why Delta Star Trformers Are Used For Lighting Loads?

For lighting fixtures masses, impartial conductor is should and hence the secondary need to be celebrity winding. And this lighting fixtures load is always unbalanced in all 3 stages. To minimize the modern-day unbalance within the primary we use delta winding in the number one. So delta / megastar trformer is used for lights masses.

Q4. What Is Electric Traction?

Electric traction me the usage of the electric strength for traction system (i.E. For railways,trams, trolleys etc).

Electric traction me use of the strength for railways,trams, trolleys and many others. Now a days, magnetic traction is also used for bullet trains.And essentially dc vehicles are used for electric powered traction systems.

Q5. What Is Meant By Armature Reaction?

The impact of armature flu to fundamental flux is called armature reaction. The armature flux might also support principal flux or opposes main flux.

Q6. What Is The Difference Between Surge Arrestor And Lightning Arrestor?

LA is installed outside and the effect of lightning is grounded,in which as surge arrestor installed inner panels comprising of resistors which consumes the energy and nullify the effect of surge.

Q7. What Is Sf6 Circuit Breaker?

SF6 is Sulpher hexa Flouride gas.. If this gas is used as arc quenching medium in a Circuitbreaker me SF6 CB.

Q8. Explain The Differences Between "direct Mapped", "fully Associative", And "set Associative" Caches

If every block has best one place it could seem inside the cache, the cache is said to be direct mapped. The mapping is typically (block-body deal with) modulo (quantity of blocks in cache).

If a block can be positioned everywhere inside the cache, the cache is said to be fully associative.

If a block can be placed in a restrained set of locations within the cache, the cache is said to be set associative. A set is a collection of  or more blocks inside the cache. A block is first mapped onto a fixed, and then the block can be placed anywhere within the set. The set is typically selected by means of bit selection; this is, (block-body cope with) modulo (number of units in cache). If there are n blocks in a hard and fast, the cache placement is called n-way set associative.

Q9. What Is The Principle Of Motor?

Whenever a contemporary carrying conductor is located in an magnetic area it produce turning or twisting movemnt is referred to as as torque.

Q10. What Is Vaccum Currcuit Breaker.Define With Cause And Where Be Use It Device?

A breaker is normally used to break a ciruit. At the same time as breaking the circuit, the touch terminals might be separated. At the time of seperation an air gap is formed in among the terminals. Due to current contemporary flow the air in the gap is ionised and outcomes inside the arc. Numerous mediums are used to quench this arc in respective CB’s. However in VCB the medium is vaccum gas. Since the air within the CB is having vaccum strain the arc formation is interrupted. VCB’s can be used upto kv.

Q11. Which Motor Has High Starting Torque And Staring Current Dc Motor, Induction Motor Or Synchronous Motor?

DC Series motor has excessive starting torque. We cannot start the Induction motor and Synchronous vehicles on load, but can't start the DC collection motor with out load.

Q12. What Is Encoder, How It Function?

An encoder is a tool used to change a signal (together with a bitstream) or records right into a code. The code may serve any of a number of functions which include compressing information for trmission or storage, encrypting or including redundancies to the input code, or trlating from one code to every other.

This is usually carried out by using me of a programmed algorithm,mainly if any part is digital, while maximum analog encoding is done with analog circuitry.

Q13. What Is The Difference Between A Verilog Task And A Verilog Function?

The following policies distinguish tasks from capabilities:

A feature shall execute in one simulation time unit; a challenge can comprise time-controlling statements.

A feature can not allow a undertaking; a venture can permit other obligations or functions.

A feature shall have as a minimum one input type argument and shall now not have an output or inout type argument;a assignment could have 0 or more arguments of any type.

A characteristic shall return a unmarried value; a undertaking shall now not go back a value.

Q14. What Are The Advantages Of Speed Control Using Thyristor?

Advantages :

Fast Switching Characterstics than Mosfet, BJT, IGBT.

Low value.

Higher Accurate.

Q15. Why Link Is Provided In Neutral Of An Ac Circuit And Fuse In Phase Of Ac Circuit?

Link is furnished at a Neutral common point in the circuit from which various connection are taken for the character manage circuit and so it's miles given in a hyperlink form to withstand excessive Amps. But in the case of Fuse within the Phase of AC circuit it's far designed such that the fuse score is calculated for the specific circuit (i.E load) only.So if any malfunction occur the fuse linked within the unique manipulate circuit alone will blow off.

Q16. How Many Types Of Colling System It Trformers?

ONAN (oil herbal,air natural).

ONAF (oil herbal,air compelled).

OFAF (oil pressured,air pressured).

ODWF (oil direct,water forced).

OFAN (oil forced,air pressured).

Q17. What Will Happen When Power Factor Is Leading In Distribution Of Power?

If their is excessive strength component, i.E if the energy aspect is near one:

losses in shape of heat may be reduced,

cable turns into less cumbersome and clean to carry, and really reasonably-priced to manage to pay for, &

it additionally reduces over heating of tranformers.

Q18. What Is The One Main Difference Between Ups & Inverter ? And Electrical Engineering & Electronics Engineering ?

Uninterrupt energy deliver is especially use for short time .Me in keeping with united states of americaVA it gives backup.

Usais likewise  sorts :

online.

Offline.

Online united stateshaving high volt and amp for long time backup with with high dc voltage.However u.S.Begin with 2v dc with 7 amp. But inverter is startwith 2v,24,dc to 36v dc and 20amp to 80amp battery with long term backup. 

Q19. What Happens If I Connect A Capacitor To A Generator Load?

Connecting a capacitor throughout a generator constantly improves electricity issue,but it will assist relies upon up at the engine potential of the alternator,different smart the alternator might be over loaded due to the greater watts fed on due to the improvement on pf. Secondly, don’t join a capacitor throughout an alternator whilst it's miles selecting up or with none different load.

Q20. What Happen If We Give 220 Volts Dc Supply To D Bulb R Tube Light?

Bulbs [devices] for AC are designed to function such that it offers excessive impedance to AC supply. Normally they've low resistance. When DC supply is implemented, due to low resistance, the current through lamp might be so high that it could harm the bulb element.

Q21. Why Syn. Generators Are Used For The Production Of Electricity?

Synchronous machines have capability to work on distinctive energy element(or say unique imaginary pow varying the field emf. Hence syn. Turbines are used for the manufacturing of strength.

Q22. How Tube Light Circuit Is Connected And How It Works?

A choke is connected in one give up of the tube mild and a starter is in collection with the circuit. When supply is provided ,the starter will interrupt the deliver cycle of AC. Due to the surprising change of supply the chock will generate around 1000volts . This volt will able to to interrupt the electrons in the tube to make electron waft. As soon as the present day passes thru the tube the starter circuit can be out of element. Now there may be no change of supply reasons choke voltage normalized and act as reduce the modern-day.

Q23. What Is Power Factor? Whether It Should Be High Or Low? Why?

Power element have to be excessive that allows you to get smooth operation of the gadget.Low strength element me losses could be extra.It is the ratio of true energy to obvious electricity. It needs to be ideally @if it's miles too low then cable over heating & device overloading will occur.

If it's far greater than 1 then load will act as capacitor and begins feeding the source and could purpose tripping.(if pf is poor ex: zero.17 to fulfill real strength load has to attract extra contemporary(V constant),bring about more losses if pf is good.

Ex: 0.95 to fulfill real power load has to draw much less present day(V regular),result in less losses).

Q24. What Is Meant By Regenerative Braking?

When the supply is cutt off for a strolling motor, it still preserve running due to inertia. In order to prevent it fast we vicinity a load(resitor) throughout the armature winding and the motor have to have  maintained continuous field supply. So that back e.M.F voltage is made to use across the resistor and because of load the motor stops speedy.This kind of breaking is referred to as as “Regenerative Breaking”.

Q25. What Is The Difference Between Synchronous Generator & Asynchronous Generator?

In easy, synchronous generator supply’s each lively and reactive power but asynchronous generator(induction generator) supply’s most effective lively strength and study reactive energy for magnetizing.This kind of generators are utilized in windmills.

Q26. What Is Frantic Effect?

Output voltage is more than the input voltage or receiving end voltage is extra than the sending cease voltage.

Q27. What Is Acsr Cable And Where We Use It?

ACSR me Aluminium conductor steel reinforced, this conductor is utilized in trmission & distribution.

Q28. What Is An Exciter And How Does It Work?

There are  sorts of exciters, static exciter and rotory exciter.

Purpose of excitor is to supply the excitation dc voltage to the constant poles of generator.

Rotory excitor is an additional small generator installed on the shaft of main generator. If it is dc generator, it will supply dc to the rotory poles through slip ring and brushes(traditional alternator).

If it is an ac excitor, out placed of ac excitor is rectified through rotating diodes and deliver dc to major fixed poles.Ac excitor is the ac generator whose field winding are desk bound and armature rotates. Preliminary voltage is built up by residual magnetism.It gives the starting torque to the generator.

Q29. Difference Between A Four Point Starter And Three Point Starter?

The shunt connection in four point stater is provided one by one shape the line where as in 3 point stater it is linked with line that's the drawback in three point stater.

Q30. What Is Automatic Voltage Regulator(avr)?

AVR is an abbreviation for Automatic Voltage Regulator.It is important element in Synchronous Generators, it controls theoutput voltage of the generator by way of controlling its excitation modern. Thus it can manage the output Reactive Power of the Generator.

Q31. Explain The Working Principal Of The Circuit Breaker?

Circuit Breaker is one which makes or breaks the circuit.It has two contacts particularly fixed touch & shifting contact.Below everyday condition the moving touch comes in touch with constant touch thereby forming the closed contact for the flow of cutting-edge. During strange & faulty conditions(when modern-day exceeds the rated price) an arc is produced among the constant & moving contacts & thereby it bureaucracy the open circuitArc is extinguished by way of the Arc Quenching media like air, oil, vaccum etc

Q32. What Is Meant By Insulation Voltage In Cables? Explain It?

It is the property of a cable by distinctive feature of it may withstand the applied voltage without rupturing it is called insulation level of the cable.

Q33. What Is Boucholz Relay And The Significance Of It In To The Trformer?

Boucholz relay is a tool that's used for the safety of trformer from its internal faults, it's far a fuel based totally relay. Every time any internal fault happens in a trformer, the boucholz relay without delay offers a horn for a while, if the trformer is remoted from the circuit then it forestall its sound itself different sensible it trips the circuit by way of its own tripping mechanism.

Q34. There Are A Trformer And An Induction Machine. Those Two Have The Same Supply. For Which Device The Load Current Will Be Maximum? And Why?

The motor has max load current examine to that of trformer due to the fact the motor consumes real electricity.. And the trformer is simplest producing the operating flux and its now not consuming.. For this reason the weight cutting-edge within the trformer is due to middle loss so it's far minimal.

Q35. Why The Capacitors Works On Ac Only?

Generally capacitor offers countless resistance to dc additives(i.E., block the dc additives). It permits the ac additives to bypass via.

Q36. What Is Stepper Motor.What Is Its Uses?

Stepper motor is the electrical system which act upon input pulse carried out to it. It's miles one form of synchronous motor which runs in steps in either course in place of going for walks in complete cycle.So, in automation components it is used.