Salzer Electronics Junior Mechanical Design Engineer Interview Questions and Answers

Q1. Related electrical question
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Q2. Like wire connection
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Q1. Basic questions
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Q2. Previous employer related
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Q1. Technical questions
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Q2. Machine related
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Over all plant related

Q1. Man power handle and previous employer related
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Q1. What is 3-phase 4 wair system
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A 3-phase 4 wire system is a type of electrical system commonly used for power distribution.
• Consists of three conductors carrying alternating current at the same frequency, with a fourth neutral conductor

• Provides a more balanced and efficient power distribution compared to single-phase systems

• Commonly used in industrial and commercial applications for higher power requirements

• Example: Used in large factories, office bu...read more
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Q2. Which of the following is a characteristic of digital signal
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A characteristic of digital signal is that it is discrete and represented by binary numbers.
• Digital signals are represented by discrete values

• Digital signals are represented by binary numbers (0s and 1s)

• Digital signals are less susceptible to noise compared to analog signals
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Q3. An electrical signal can be represented in either Thevenin form or Norton From. However, Norton representation is preferred when
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Norton representation is preferred when the load impedance is known and fixed.
• Norton representation is preferred when the load impedance is known and fixed, as it simplifies calculations.

• Thevenin representation is preferred when the load impedance is unknown or variable.

• Norton equivalent circuits are easier to analyze in terms of current flow and power calculations.

• Thevenin equivalent circuits are easier to analyze in ...read more
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Diploma in electrical engineering

Q1. Electrical engineering
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Q2. Electrical motor
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Q3. Electrical equipment
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Q1. Electrical maintenance
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Q2. Electrical motor
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Q1. Questions about high voltage and high current components.
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Q2. Questions on different topologies used in power supplies
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Q1. What is a locomotive?
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A locomotive is a rail transport vehicle that provides the motive power for trains.
• Locomotives can be powered by diesel engines, electric motors, or steam engines.

• They are designed to pull or push train cars along railway tracks.

• Examples include the GE ES44AC diesel locomotive and the Siemens ACS-64 electric locomotive.

• Locomotives are equipped with various controls for speed, braking, and safety.

• They often have a disti...read more
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Q2. What is an auxiliary converter?
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An auxiliary converter is a device that converts electrical energy for auxiliary systems in larger power systems.
• Used to supply power to auxiliary equipment like control systems and lighting.

• Commonly found in power plants, ships, and industrial applications.

• Examples include DC-DC converters and AC-DC converters.

• Enhances system reliability by providing backup power.
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Q3. What are the differences between Direct Current (DC) and Alternating Current (AC)?
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DC flows in one direction, while AC changes direction periodically, affecting their applications and characteristics.
• DC (Direct Current) flows steadily in one direction, e.g., batteries.

• AC (Alternating Current) changes direction periodically, e.g., household power supply.

• DC is used in low-voltage applications like electronics and batteries.

• AC is used for high-voltage power transmission and in homes.

• DC has a constant vo...read more
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Q4. What is a trainer, and what are the different types of trainers?
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A trainer is a professional who imparts knowledge and skills in a specific field, using various methods and tools.
• Types of trainers include: Technical Trainers (e.g., software training), Corporate Trainers (e.g., leadership skills), and Fitness Trainers (e.g., personal trainers).

• Technical Trainers focus on specific skills or technologies, such as programming languages or software applications.

• Corporate Trainers develop...read more
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Q5. What is control wiring?
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Control wiring refers to the electrical connections that manage and control machinery and equipment operations.
• Used in automation systems to connect sensors, switches, and controllers.

• Examples include wiring for relays, contactors, and programmable logic controllers (PLCs).

• Typically involves low voltage circuits for safety and efficiency.

• Control wiring can be found in HVAC systems, industrial machinery, and home automa...read more
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Q6. What is an auxiliary converter, and what does it mean?
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An auxiliary converter is a device that converts electrical energy for auxiliary systems in larger electrical systems.
• Used in power systems to supply power to non-primary loads.

• Examples include DC-DC converters for battery charging.

• Common in renewable energy systems to manage energy flow.

• Can provide power for control systems, lighting, and HVAC.
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Q7. What is a transformer?
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A transformer is an electrical device that transfers electrical energy between circuits through electromagnetic induction.
• Transforms voltage levels: steps up or steps down voltage.

• Consists of primary and secondary coils wound around a magnetic core.

• Used in power distribution systems to manage voltage levels.

• Example: A step-down transformer reduces 220V to 12V for household use.

• Essential for efficient long-distance elec...read more
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Q8. What are high tension (HT) and low tension (LT) panels?
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HT panels handle high voltage, while LT panels manage low voltage in electrical distribution systems.
• HT panels operate at voltages above 1 kV, typically used in substations.

• LT panels operate at voltages below 1 kV, commonly used in residential and commercial buildings.

• HT panels are used for transmission and distribution of electricity over long distances.

• LT panels are used for local distribution and powering appliances...read more
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Q9. What are the types of motor control panels?
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Motor control panels manage and control electric motors, ensuring efficient operation and protection.
• Direct-On-Line (DOL) Starter: Simple and cost-effective for small motors.

• Star-Delta Starter: Reduces starting current for larger motors.

• Variable Frequency Drive (VFD): Controls motor speed and torque by varying frequency.

• Soft Starter: Gradually increases motor voltage to reduce mechanical stress.

• Programmable Logic Contr...read more
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Q10. What are the types of power control panels?
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Power control panels manage and distribute electrical power in various applications, ensuring safety and efficiency.
• Motor Control Centers (MCC): Used for controlling motors in industrial applications.

• Distribution Boards: Distribute electrical power to various circuits.

• Automatic Transfer Switch Panels: Switch between power sources automatically during outages.

• Control Panels for Generators: Manage generator operations an...read more
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Q1. Types ho single phase motor
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Q2. Types of transfermar
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Q1. Conducting Material varieties
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Q2. Difference between copper busbar and aluminum bar
Ans. 
Copper busbars have higher conductivity and better resistance to corrosion compared to aluminum bars.
• Copper busbars have higher conductivity than aluminum bars.

• Copper busbars have better resistance to corrosion compared to aluminum bars.

• Aluminum bars are lighter and cheaper than copper busbars.

• Aluminum bars are more prone to oxidation compared to copper busbars.
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Q3. Methods of Heat transfer
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Heat transfer methods include conduction, convection, and radiation.
• Conduction: Heat transfer through direct contact between materials (e.g. touching a hot pan)

• Convection: Heat transfer through the movement of fluids (e.g. boiling water)

• Radiation: Heat transfer through electromagnetic waves (e.g. feeling the warmth of the sun)
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Q4. Tolerance stack
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Q5. Types of Material and Various plastic
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Various types of materials and plastics used in engineering applications.
• Common types of materials include metals, polymers, ceramics, and composites

• Plastics are a type of polymer that can be categorized as thermoplastics or thermosets

• Examples of plastics include polyethylene, polystyrene, PVC, and ABS

• Materials selection is crucial in engineering design to ensure desired properties and performance
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