L&T Construction, Mining and Industrial Machinery Junior Mechanical Engineer Interview Questions and Answers

Q1. How to calculate Boiler direct & indirect efficiency ?
Ans. 
Boiler efficiency can be calculated by measuring the heat input and heat output of the boiler.
• Calculate the heat input by measuring the fuel flow rate, fuel calorific value, and fuel consumption.

• Calculate the heat output by measuring the steam flow rate and steam enthalpy.

• Direct efficiency = (Heat output / Heat input) * 100%

• Indirect efficiency = Direct efficiency * Boiler efficiency of other components (like economizer
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Q2. What is the monthly maintenance cost of your section ?
Ans. 
The monthly maintenance cost of my section is approximately $10,000.
• The monthly maintenance cost includes expenses for spare parts, labor, equipment rental, and utilities.

• Regular maintenance tasks such as lubrication, inspections, and repairs contribute to the overall cost.

• Cost may vary depending on the size of the section, age of equipment, and frequency of maintenance activities.
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Q1. Qualification details and branch related put on question and sefty awareness etc .
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Q2. After completing job time period than company give a chance to be counties work with as who to
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Q3. His previous year medical report
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Q1. In college time about know his project and details
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Q2. Femily background and qualifications experience
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Q1. Some technical question about your department
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Q1. Hr round not good worst hr culture
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Q1. About your self and wasting your time
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20 questions were asked from English and Aptitude.

Q1. Questions from strength of Material, TOM were asked.
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Q2. Strength and weakness
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Q3. Questions from project
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Q1. Ex 1200 v excavator
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Q2. General maintenance, schedule
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Q1. Mechanic question
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Detailed information about your projects and curriculum.

Q1. What type of projects?
Ans. 
I have worked on a variety of projects including designing automotive components, HVAC systems, and industrial machinery.
• Designed automotive components such as suspension systems and engine parts

• Worked on HVAC system designs for commercial buildings

• Designed industrial machinery for manufacturing processes
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Q2. What type of tools do you know,?
Ans. 
I know various tools used in Mechanical Engineering design such as CAD software, simulation tools, and prototyping equipment.
• CAD software (e.g. AutoCAD, SolidWorks)

• Simulation tools (e.g. ANSYS, MATLAB)

• Prototyping equipment (e.g. 3D printers, CNC machines)
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Q1. Why was i hired you in our company
Ans. 
I want develop my skills so,you can hired me to this job
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Q2. What was the experience do you have in this field
Ans. 
1 year experience in oil and gas
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Q3. What is your occupation
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Q4. Do you have any experince in 3d
Ans. 
Yes, I have experience in 3D modeling and design using software like SolidWorks and AutoCAD.
• I have used SolidWorks extensively for creating 3D models of mechanical components and assemblies.

• I am proficient in creating detailed drawings and simulations using 3D modeling software.

• I have experience in designing complex geometries and assemblies in 3D.

• I have also used AutoCAD for 2D drafting and converting 2D drawings into
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Q5. Do you know about oil and gas
Ans. 
Yes, oil and gas are natural resources that are extracted from the earth for various purposes such as fuel, heating, and electricity generation.
• Oil and gas are fossil fuels formed from the remains of plants and animals that lived millions of years ago.

• They are extracted from underground reservoirs using drilling techniques.

• Oil is used for transportation, heating, and manufacturing of various products.

• Natural gas is use...read more
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Q1. What is the work in ingine
Ans. 
The work in engineering involves designing, analyzing, and improving mechanical systems and processes.
• Designing and creating blueprints for machines, equipment, or structures

• Analyzing and testing prototypes to ensure they meet specifications

• Improving existing mechanical systems to enhance performance and efficiency

• Collaborating with other engineers and professionals to solve technical problems

• Using computer-aided desig...read more
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Q2. What is work in piston
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Work in piston refers to the force exerted by the expanding gases on the piston during the power stroke.
• During the power stroke, fuel is ignited in the combustion chamber, which creates a high-pressure gas that pushes the piston down.

• The force exerted by the expanding gases on the piston is what produces the work output of the engine.

• The work done by the piston is transferred to the crankshaft, which converts the linea...read more
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Q3. Types of gear is working
Ans. 
Types of gears include spur gears, helical gears, bevel gears, worm gears, and rack and pinion gears.
• Spur gears have straight teeth and are used to transmit motion between parallel shafts.

• Helical gears have angled teeth and provide smoother and quieter operation compared to spur gears.

• Bevel gears have cone-shaped teeth and are used to transmit motion between intersecting shafts.

• Worm gears consist of a worm and a worm w...read more
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Q4. Which 2 stroke and 4 stroke engine
Ans. 
Two-stroke engines have a power stroke every revolution, while four-stroke engines have a power stroke every other revolution.
• Two-stroke engines have a simpler design and are lighter than four-stroke engines.

• Two-stroke engines are commonly used in small power tools, motorcycles, and boats.

• Four-stroke engines are more fuel-efficient and have a longer lifespan than two-stroke engines.

• Four-stroke engines are commonly used
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Q5. What is working for propeller shaft
Ans. 
Propeller shaft transmits power from engine to the wheels of a vehicle.
• It connects the transmission to the rear axle.

• It rotates at high speeds and needs to be balanced.

• It may have universal joints to allow for suspension movement.

• It may have a slip joint to allow for changes in length due to suspension movement.

• It may be made of steel or aluminum depending on the application.
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