Electrical Interview Questions and Answers

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Electrical Engineering Interview Questions:

Electrical Interview Questions and Answers: Students those who are from the electrical branch and looking for the Electrical Questions and Answers those are right place!! We have provided the Electrical Questions along with answers. Basic Electrical Questions are listed out here, Students who are from Electrical stream and going to take job interview those can now check the basic electrical engineering questions here. We have collected frequently asked interview Electrical questions and answers from MNC’s companies. All those Electrical Technical Questions are specified in this page, Students who want to crack the Job interview those can check the electrical engineering question papers with answers. Read these Electrical interview Questions before going to a Job interview. To crack the job you need to have interview skills along with prepare for job interview questions and answers.

Electrical Technical Questions:

Students who are from an Electrical course in Diploma and going to take the job interview those should start their interview preparation for the Diploma electrical engineering interview questions to crack the job. In this page, for all our electrical students have provided the Industrial electrician interview questions. Students can read the electrical maintenance interview questions. Those who are going to take the electrical interview, Prepare all the below electrical question answer now. The interviewer can also follow these electrical interview questions and ask these electrical questions in an interview. Questions for interviewer are listed out here, Read all these questions and ask the candidates those who have attended for electrical interview.

Electrical Interview Questions and Answers

Electrical Interview Questions and Answers

What is electric traction?

  • Electric traction means using the electric power for traction system (i.e. for railways, trams, trolleys etc).
    Electric traction means the use of the electricity for all the above machines. Nowadays, magnetic traction is also used for bullet trains.and basically, dc motors are used for electric traction systems.
  • How can you start-up the 40w tube lite with 230v AC/DC without using any choke/Coil?
    It’s possible by means of Electronic chokes, otherwise, it’s not possible to ionize the particles in tube light with normal voltage.

The operation carried out in Thermal power stations?
The water is obtained in the boiler and the coal is burnt so that steam is obtained this steam is allowed to hit the turbine, the turbine which is coupled to the generator generates the electricity.

Whats MARX CIRCUIT?
It is used with generators for charging a number of capacitors in parallel and discharging them in series.It is used when voltage required for testing is higher than the available.

What are the advantages of speed control using thyristor?
Advantages :

Fast Switching Characteristics than Mosfet, BJT, IGBT
Low cost
Higher Accurate.

What is the principle of the motor?
Whenever a current carrying conductor is placed in a magnetic field it produces turning or twisting movement is called as torque.

What is meant by armature reaction?
The effect of armature flu to main flux is called armature reaction. The armature flux may support main flux or opposes main flux.

What is ACSR cable and where we use it?
ACSR means Aluminium conductor steel reinforced, this conductor is used in transmission & distribution.

What is 2 phase motor?
A two-phase motor is a motor with the starting winding and the running winding have a phase split.
e.g; ac servo motor.where the auxiliary winding and the control winding have a phase split of 90 degrees.

What is the significance of vector grouping in Power Transformers?
Every power transformer has a vector group listed by its manufacturer. Fundamentally it tells you the information about how the windings are connected (delta or wye) and the phase difference between the current and voltage. EG. DYN means Delta primary, Wye Secondary and the current is at o clock referred to the voltage.

what is the principle of the motor?
Whenever a current carrying conductor is placed in a magnetic field it produces turning or twisting movement is called as torque.

What is meant by armature reaction?
The effect of armature flu to main flux is called armature reaction. The armature flux may support main flux or opposes main flux.

What is Automatic Voltage regulator (AVR)?
AVR is an abbreviation for Automatic Voltage Regulator.It is an important part in Synchronous Generators, it controls the output voltage of the generator by controlling its excitation current. Thus it can control the output Reactive Power of the Generator.

Difference between a four-point starter and three-point starter?
The shunt connection in four-point stater is provided separately from the line whereas in three-point stater it is connected with a line which is the drawback in three-point stater.

What is the difference between surge arrestor and lightning arrestor?
LA is installed outside and the effect of lightning is grounded, whereas surge arrestor installed inside panels comprising of resistors which consumes the energy and nullify the effect of the surge.

How many types of cooling system it transformers?

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ONAN (oil natural, air natural)
ONAF (oil natural, air forced)
OFAF (oil forced, air forced)
ODWF (oil direct, water forced)
OFAN (oil forced, air forced)

There are a Transformer 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 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 SF6 Circuit Breaker?
SF6 is Sulpher hexa Flouride gas.. if this gas is used as arc quenching medium in a Circuit breaker means SF6 CB.

What is the frantic effect?
The output voltage is greater than the input voltage or receiving end voltage is greater than the sending end voltage.

Where should the lighting arrestor be placed in distribution lines?
Near distribution transformers and outgoing feeders of 11kv and incoming feeder of 33kv and near power transformers in sub-stations.

Define IDMT relay?
It is an inverse definite minimum time relay.In IDMT relay its operating is inversely proportional and also a characteristic of minimum time after which this relay operates.It is inverse in the sense ,the tripping time will decrease as the magnitude of fault current increase.

Why is the starting current high in a DC motor?
Resolution:In DC motors, Voltage equation is V=Eb-IaRa (V = Terminal voltage,Eb = Back emf in Motor,Ia = Armature current,Ra = Aramture resistance).At starting, Eb is zero. Therefore, V=IaRa, Ia = V/Ra ,where Ra is very less like 0.01ohm.i.e, Ia will become enormously increased.

Why can series motor not be started on no-load?
Resolution: Series motor cannot be started without load because of high starting torque. Series motor is used in Trains, Crane etc.

Why an ac solenoid valve attract the plunger even though we interchange the terminal? Will the poles changes?
Yes because the poles change for every half-cycle of ac voltage so the polarity of AC voltage is continuously changing for every half cycle. so, interchanging of terminals in ac system does not show any difference. That’s why the ac solenoid attract the plunger even though it’s terminals are interchanged.

Why temperature rise is conducted in bus bars and isolators?
Bus bars and isolators are rated for continuous power flow, that means they carry heavy currents which rise their temperature. so it is necessary to test this device for temperature rise.

If one lamp connects between two phases it will glow or not?
If the voltage between the two-phase is equal to the lamp voltage then the lamp will glow. When the voltage difference is big it will damage the lamp and when the difference is smaller the lamp will glow depending on the type of lamp.

Why back emf used for a dc motor? highlight its significance.

The induced emf developed when the rotating conductors of the armature between the poles of the magnet, in a DC motor, cut the magnetic flux, opposes the current flowing through the conductor, when the armature rotates, is called back emf. Its value depends upon the speed of rotation of the armature conductors. In starting, the value of back emf is zero.

What is a slip in an induction motor?

Slip can be defined as the difference between the flux speed (Ns) and the rotor speed (N). The speed of the rotor of an induction motor is always less than its synchronous speed. It is usually expressed as a percentage of synchronous speed (Ns) and represented by the symbol ‘S’.

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