Electrical engineering interviewtop 8 questions Answer 2021. Electrical engineer jobs.

Electrical engineering interviewtop 8  questions Answer 2021

1. How many types of cooling system in transformers on an oil natural a natural?



Ans :1f oil natural air first off F oil forced air forced odwF oil direct water forced o fan oil forced air forced their are a transformer and induction machine. those two have a same supply for which device the load current will be maximum and why the motor has max load current compared to that of transformer because the motor consumes real power and the transformer is only producing the working flux and it's not consuming hence the load current in the transformer is because of core loss so it is minimum. 

 what is to phase motor a

two phase motor is a motor with the

starting winding and the running winding

have a phase split example AC servo

motor where the auxiliary winding and

the control winding have a faceplate of

ninety degree what will happen when

power factor is leading in distribution

of power if there is high power factor

that is if the power factor is close to

one losses in form of heat will be

reduced cable becomes less bulky and

easy to carry and very cheap to effort

and it also reduces overheating of

transformers what is AC SR cable and

where we use it AC SR means LVM

conductors steel-reinforced this

conductor is used in transmission and

distribution which motor has high

starting torque and starting current DC

motor induction motor or synchronous

mode

DC series motor has high starting torque

we cannot start the induction motor and

synchronous motor on load but cannot

start the DC series motor without load

what happened if we you to 20 volts DC

supply to the bulb Antibes light bulbs

for AC are designed to operate such that

it offers high impedance to AC supply

normally they have low resistance when

DC supply is applied due to low

resistance the current through lamp

would be so high that it may damage the

bulb element what is meant by armature

reaction the effect of armature flux to

main flux is called armature reaction

the amateur flux may support main flux

or opposes main flux what is the

principle of motor

whenever a current carrying conductor is

placed in a magnetic field

it produces turning or twisting moment

is called as torque what are the

advantages of speed control using 3

stirrer advantages fast switching

characteristics than MOSFET BJT IGBT low

cost higher accurate what is encoder and

how it functions an encoder is a device

used to change a signal such as a bit

stream or data into a code the code miss

of any of a number of purposes such as

compressing information for transmission

or storage encrypting or adding

redundancies to the input code or

translating from one code to another

code this is usually done by means of a

programmed algorithm specially if any

part is digital while most analog

encoding is done with analog circuitry

what is Marc circuit it is used with

generators for charging a number of

capacitors in parallel and discharging

them in a series it is used when voltage

required for

sting is higher than the available those

operation carried out in thermal power

stations the water is obtained in the

boiler and the core is burned so that

steam is obtained this steam is allowed

to hit the turbine the turbine which is

coupled with a generator generates the

electricity how can you start up the 40

watt tube light with 230 volts of ac/dc

without using any choke or coil it's

possible by means of electronic chokes

otherwise it is not possible to ionize

the particles in the tube light without

normal voltage what is electric

attraction electric traction means using

the electric power for traction system

that is for railways trams trolleys etc

electric traction means use of the

electricity for railways trams trolleys

etc nowadays magnetic traction is also

used for bullet trains and basically DC

motors are used for electric traction

systems