Lupin Electrical Engineer Interview Questions and Answers for Experienced

Q1. About yourself and personal background
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Q1. About circuit breaker
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Q1. About the power system and equipment maintenance
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Q2. Operational excellence initiatives.
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Basic appti ques were asked

Q1. Basic knowledge about electrical engineering is must to clear it
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Q2. What is transformer types
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Transformer types include step-up, step-down, isolation, autotransformer, and instrument transformer.
• Step-up transformer increases voltage while decreasing current

• Step-down transformer decreases voltage while increasing current

• Isolation transformer separates primary and secondary windings

• Autotransformer has a single winding with multiple taps for voltage adjustment

• Instrument transformer is used for measuring current or
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Q3. Motors & it's types
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Motors are devices that convert electrical energy into mechanical energy. There are various types of motors.
• DC motors: used in appliances, toys, and automobiles

• AC motors: used in industrial machinery and household appliances

• Stepper motors: used in robotics and automation

• Servo motors: used in precision control applications

• Brushless motors: used in drones and electric vehicles
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Q1. What is chiller and compressor
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A chiller is a machine that removes heat from a liquid via a vapor-compression or absorption refrigeration cycle. A compressor is a mechanical device that increases the pressure of a gas by reducing its volume.
• A chiller is used to cool down water or other fluids in industrial or commercial settings.

• There are two types of chillers: vapor-compression and absorption.

• Compressors are used in refrigeration systems to compres...read more
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Q2. How many types of pumps
Ans. 
There are several types of pumps used in various industries.
• Centrifugal pumps

• Positive displacement pumps

• Axial flow pumps

• Mixed flow pumps

• Jet pumps

• Submersible pumps

• Diaphragm pumps

• Gear pumps

• Peristaltic pumps

• Rotary lobe pumps

• Screw pumps

• Vane pumps
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Q3. In the pump parts deference between any two pumps
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The pump parts can differ in terms of material, size, shape, and function.
• Different pumps may have different impellers, casings, shafts, bearings, and seals.

• The material used for the parts can vary depending on the type of fluid being pumped and the environment.

• The size and shape of the parts can also vary depending on the flow rate and pressure requirements.

• The function of the parts can differ based on the type of pum...read more
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Q4. Working principle of the solanoid Valve
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Solenoid valve works on the principle of electromagnetism to control the flow of fluids or gases.
• It consists of a coil, plunger, and valve body

• When the coil is energized, it creates a magnetic field that pulls the plunger towards it

• This movement opens or closes the valve, allowing or blocking the flow of fluid or gas

• Used in various applications such as refrigeration, HVAC systems, and industrial automation
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