OPTCL Apprenticeship Trainee Interview Questions and Answers

Q1. What is transformer ?
Ans. 
A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.
• Transformers are used to increase or decrease the voltage of an alternating current (AC) signal.

• They consist of two or more coils of wire, known as windings, that are wound around a core made of magnetic material.

• The primary winding receives the electrical energy from the input circuit a...read more
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Q2. How to work 3 phase induction motor?
Ans. 
A 3-phase induction motor works by creating a rotating magnetic field that interacts with the rotor to produce motion.
• A 3-phase induction motor requires a 3-phase power supply.

• The stator windings create a rotating magnetic field.

• The rotating magnetic field induces currents in the rotor, which in turn creates a magnetic field.

• The interaction between the stator and rotor magnetic fields produces torque and rotation.

• The s...read more
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Q3. Which principles transformer are work?
Ans. 
The principles that transformers work on
• Principle of electromagnetic induction

• Principle of mutual induction

• Principle of energy conservation

• Principle of step-up and step-down voltage transformation

• Principle of magnetic flux linkage
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Q4. What are the types of losses in transformer ?
Ans. 
The types of losses in a transformer are copper losses and iron losses.
• Copper losses occur due to the resistance of the transformer windings.

• Iron losses occur due to the magnetic properties of the transformer core.

• Copper losses include both the I^2R losses in the windings and eddy current losses.

• Iron losses include hysteresis losses and eddy current losses in the core.

• Copper losses can be reduced by using larger conduc...read more
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Q1. Tell me about your self ?
Ans. Sir/ madam I am suvendu sahoo from odisha. I was studied in government polytechnic Bhubaneswar in electrical engineering and then I was worked in one year apprenticeship in optcl.
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Logical reasoning, Numeral system, Algebra, Geometry

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