Jindal Stainless Junior Engineer Electrical Interview Questions and Answers

Q1. Transformer working principle, what oil use in Transformer, oil not add what happen.
Ans. 
Transformers work on the principle of electromagnetic induction. Mineral oil is commonly used in transformers. If oil is not added, the transformer may overheat and fail.
• Transformers work on the principle of electromagnetic induction

• Mineral oil is commonly used in transformers to provide insulation and cooling

• If oil is not added, the transformer may overheat and fail
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Q2. How to start dc motor.
Ans. 
To start a DC motor, apply a voltage to the motor terminals.
• Connect the positive terminal of the power supply to the motor's positive terminal.

• Connect the negative terminal of the power supply to the motor's negative terminal.

• Gradually increase the voltage to avoid sudden jerks or damage to the motor.

• Ensure the motor is properly lubricated and free from any mechanical obstructions before starting.
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Q3. Why you join tata power
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Q1. Electrical Circuits Breakers?
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*A and B invest in a business in the ratio 3 : 2. If 5% of the total profit goes to charity and A's share is Rs. 855, the total profit is?

*Alfred buys an old scooter for Rs. 4700 and spends Rs. 800 on its repairs. If he sells the scooter for Rs. 5800, his gain percent is:

Q1. *Why Transformer Rated In kVA, Not in KW? *What are transformer losses & their types?
Ans. 
Transformers are rated in kVA because it takes into account both active power (KW) and reactive power (KVAR). Transformer losses include copper losses and iron losses.
• Transformers are rated in kVA because they handle both active power (KW) and reactive power (KVAR).

• kVA rating considers the total power (apparent power) that the transformer can handle, including the power needed for magnetizing the core.

• Transformer losse...read more
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Q2. *Mention what is the difference between generator and alternator? *Mention what are the different kind of cables used for transmissions?
Ans. 
Generator produces direct current while alternator produces alternating current. Different cables used for transmission include coaxial, twisted pair, and fiber optic cables.
• Generator produces direct current (DC) while alternator produces alternating current (AC)

• Generator uses slip rings and brushes for transmission while alternator uses a commutator

• Different cables used for transmission include coaxial, twisted pair,
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Q3. Define the principle of motors?
Ans. 
Motors operate based on the principle of electromagnetic induction, converting electrical energy into mechanical energy.
• Motors work by creating a magnetic field through the flow of current in a coil of wire.

• This magnetic field interacts with a permanent magnet or another magnetic field, causing the coil to rotate.

• The rotation of the coil is then used to drive mechanical systems, such as fans, pumps, or conveyor belts.

• D...read more
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Q1. *Why did you decide to become an electrical engineer? / What made you want to study electrical engineering
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Q2. What are the main advantages of speed control using thyristor?
Ans. 
Thyristor speed control offers precise control, energy efficiency, and reduced maintenance costs.
• Precise control of motor speed

• Improved energy efficiency by reducing power wastage

• Reduced maintenance costs due to less wear and tear on motor components

• Smooth acceleration and deceleration of motors

• Ability to control large motors with ease
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Q1. Basic dc motor and AC motor, transformer.
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Q1. Basic electrical maintenance questions.
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Q1. How many layers in underground cable
Ans. 
Underground cables typically have multiple layers for insulation and protection.
• Underground cables usually have three layers: conductor, insulation, and protective sheath

• The conductor layer carries the electrical current

• The insulation layer prevents leakage of current and protects against environmental factors

• The protective sheath provides additional protection from moisture, chemicals, and physical damage
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Q1. What is circuit braker
Ans. 
A circuit breaker is an automatic electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit.
• It is a safety device that automatically interrupts the flow of current in a circuit when it exceeds a safe level

• It is used to protect electrical equipment from damage due to overcurrent

• It can be reset after tripping, unlike a fuse which needs to be replaced

• It comes in different ...read more
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Q2. Type of motor,D.C and A.C MOTOR
Ans. 
DC motors and AC motors are two types of electric motors commonly used in various applications.
• DC motors operate using direct current, while AC motors operate using alternating current.

• DC motors are typically used in applications that require high torque at low speeds, such as in electric vehicles and robotics.

• AC motors are commonly used in household appliances, industrial machinery, and HVAC systems.

• DC motors are simp...read more
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Q1. Define the term Capacitance and Inductance?
Ans. 
Capacitance is the ability of a body to store an electric charge. Inductance is the ability of a coil to store energy in a magnetic field.
• Capacitance is measured in Farads (F)

• Capacitors are used to store energy in electronic circuits

• Inductance is measured in Henrys (H)

• Inductors are used in electronic circuits to store energy in a magnetic field

• Both capacitance and inductance are important in AC circuits
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Q2. Mention what are the different kind of cables used for transmissions?
Ans. 
Different types of cables used for transmissions include coaxial, twisted pair, fiber optic, and ribbon cables.
• Coaxial cables are used for high-frequency transmissions and have a copper core surrounded by insulation and a braided shield.

• Twisted pair cables are used for low-frequency transmissions and have two insulated copper wires twisted together.

• Fiber optic cables use light to transmit data and are made of glass or ...read more
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