Lakshmi Machine Works Design Engineer Interview Questions and Answers

Q1. What is the casting solidification time?
Ans. 
Casting solidification time is the duration it takes for molten metal to solidify in a casting process.
• Casting solidification time depends on factors like material type, mold temperature, and casting geometry.

• Higher pouring temperatures generally result in shorter solidification times.

• Thicker sections of the casting will take longer to solidify compared to thinner sections.

• Aluminum alloys typically have shorter solidif
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Q2. How you decide the parting line?
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Q3. What are the Casting design consideration?
Ans. 
Casting design considerations include material selection, part geometry, draft angles, surface finish, and shrinkage.
• Material selection is crucial for the desired properties and performance of the final part.

• Part geometry should be designed to minimize stress concentrations and ensure proper flow of molten metal.

• Draft angles are necessary for easy removal of the part from the mold.

• Surface finish requirements should be ...read more
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Q4. Current and previous work experience.
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CAD test-Housing model

Q1. About your self
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Q1. HOW TO CALCULATE CT CURRENT
Ans. 
CT current can be calculated by dividing the primary current by the turns ratio of the current transformer.
• CT current = Primary current / Turns ratio

• Primary current is the current flowing through the primary conductor

• Turns ratio is the ratio of the number of turns in the primary winding to the number of turns in the secondary winding
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Q2. WHAT IS LOCKOUT REALY
Ans. 
Lockout is a safety procedure used to ensure that machinery or equipment is properly shut off and cannot be restarted until maintenance or servicing is completed.
• Lockout involves isolating energy sources to prevent accidental startup.

• Lockout devices like padlocks and tags are used to physically lock equipment.

• Lockout procedures must be followed to prevent accidents and injuries.

• Examples of lockout include locking out e...read more
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Q3. WHAT IS IP65 FOR PANEL
Ans. 
IP65 for panel refers to the level of protection against dust and water ingress.
• IP65 rating means the panel is dust tight and protected against water jets from any direction.

• The first digit '6' indicates the level of protection against solid objects like dust.

• The second digit '5' indicates the level of protection against water ingress.

• Commonly used in outdoor or industrial applications where the panel may be exposed to...read more
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Q4. What is TCS AND MASTER TRIP REALY
Ans. 
TCS and Master Trip Relay are protective devices used in electrical systems to prevent damage during faults.
• TCS stands for Time Current Characteristic Relay, which operates based on the relationship between time and current to trip the circuit breaker during faults.

• Master Trip Relay is a relay that receives signals from various protective relays and initiates a trip signal to disconnect the circuit in case of a fault.

• B...read more
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Q5. WHAT IS LSC 2A AND LSC 2B
Ans. 
LSC 2A and LSC 2B are standards for lighting in commercial and industrial buildings.
• LSC 2A and LSC 2B are part of the Lighting Power Density (LPD) requirements in building codes.

• LSC 2A is for commercial buildings while LSC 2B is for industrial buildings.

• They specify the maximum allowable power consumption for lighting per unit area in a building.

• For example, LSC 2A may require a maximum LPD of 0.9 watts per square foot
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Q6. What REF PROTECTION and HIgh impedance and low impedance
Ans. 
REF protection is used to prevent damage to equipment from electrical faults. High impedance protection is used for sensitive equipment, while low impedance protection is used for power systems.
• REF protection is used to detect ground faults and prevent damage to equipment.

• High impedance protection is used for sensitive equipment that requires high accuracy and low fault currents.

• Low impedance protection is used for pow...read more
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Q7. ANSI CODE FOR VERIOUS PROTECTION
Ans. 
ANSI codes are used to identify various types of protection devices in electrical systems.
• ANSI code 50/51 is for instantaneous overcurrent protection

• ANSI code 67 is for directional power protection

• ANSI code 87 is for differential protection

• ANSI code 59 is for overvoltage protection
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Steam engineering knowledge on steam products

Q1. What is steam engineering
Ans. 
Steam engineering involves the design, operation, and maintenance of systems that utilize steam for various industrial applications.
• Involves designing steam systems for power generation, heating, and industrial processes

• Requires knowledge of thermodynamics, fluid mechanics, and heat transfer

• Includes maintenance of boilers, steam turbines, and piping systems

• Examples: steam power plants, steam heating systems in building
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Q1. I was selected for autocad plant 3d designer. Basic pump related questions were asked. Was asked to draw pump suction and discharge piping with its components.
Ans. Tool test involved basic drafting activity.
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Was asked for drafting support

Q1. Thought it was a interview for the post of design engineer but interviewer was interested to pointing out personal details in an unmannered way. In a 12 out of 15 minute of total time span during interview...read more
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Q2. They ask questions from irrelevant subjects not from required skills one needed for job role
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Q1. Engine basic questions
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Q2. Flywheel used in a engine
Ans. 
A flywheel is a mechanical device used in engines to store rotational energy and smooth out fluctuations in engine speed.
• Flywheels are typically made of steel or aluminum and are attached to the engine's crankshaft.

• They store energy during the power stroke and release it during the compression stroke to keep the engine running smoothly.

• Flywheels are also used in hybrid vehicles to store energy from regenerative braking...read more
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Q3. Used of flywheel, crankcase, AVM pre filter
Ans. 
Flywheel, crankcase, and AVM pre filter are components used in internal combustion engines.
• Flywheel stores rotational energy and helps maintain engine speed during power strokes.

• Crankcase houses the crankshaft and other engine components.

• AVM pre filter is used to remove larger particles from the air before it enters the engine.

• These components are essential for the proper functioning of internal combustion engines.
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Q1. Overall need check What's your career expectations
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Q2. Are you okay for traveling?
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