Draftsman/ Draughtsman - Mechanical Interview Questions and Answers in 2025 (100+ Q&A)

Draftsman/ Draughtsman - Mechanical Mechanical

Ques:- What are the steps taken in troubleshooting of a machine e.g extruder

Asked In :-

Right Answer:
1. Identify the symptoms of the problem.
2. Check the power supply and connections.
3. Inspect the control panel and settings.
4. Examine the mechanical components for wear or damage.
5. Verify the temperature and pressure settings.
6. Check for blockages in the feed and output areas.
7. Review the lubrication and maintenance records.
8. Test the sensors and actuators for proper function.
9. Run diagnostic tests if available.
10. Consult the machine manual for troubleshooting guidelines.

Draftsman/ Draughtsman - Mechanical Mechanical

Ques:- What is volumatric air change of a HOT GAS GENERATOR of a STEAM BOILER ?

Asked In :- ibp, ola,

Right Answer:
The volumetric air change of a hot gas generator in a steam boiler typically ranges from 1 to 3 times the volume of the combustion chamber per minute, depending on the design and operational requirements.

Draftsman/ Draughtsman - Mechanical Mechanical

Ques:- Explain bearing nomenclature with example.

Asked In :- TPI Composites, volkerrail, continental automotive group,

Right Answer:
Bearing nomenclature typically consists of a series of letters and numbers that indicate the bearing type, size, and design features. For example, in the designation "6205," the "6" indicates it is a deep groove ball bearing, "2" signifies the series, and "05" denotes the bore diameter of 25 mm (the first two digits of the last number multiplied by 5).

Draftsman/ Draughtsman - Mechanical Mechanical

Ques:- What is the differance between Horizental and vertical heat exchanger?

Asked In :- eximius design,

Right Answer:
A horizontal heat exchanger is oriented horizontally, allowing for easier drainage and maintenance, while a vertical heat exchanger is oriented vertically, which can enhance heat transfer efficiency and reduce footprint.

Draftsman/ Draughtsman - Mechanical General Management

Ques:- What are the innovations in the finance,who are the major players in finance & future outlook in the finance?

Asked In :-

Right Answer:
Innovations in finance include fintech advancements like blockchain, digital currencies, robo-advisors, and peer-to-peer lending. Major players in finance are traditional banks, fintech companies, investment firms, and regulatory bodies. The future outlook in finance suggests increased digitalization, greater use of artificial intelligence, and a focus on sustainability and ethical investing.

Draftsman/ Draughtsman - Mechanical Mechanical

Ques:- How air cylinder cfm calcualted.suppose cylinder bore-40mm and stroke 70mm operating pressure 6bar calculate air cylinder cfm.

Asked In :- FANUC, Teekay, ola,

Right Answer:
To calculate the CFM (Cubic Feet per Minute) of an air cylinder, use the formula:

1. Calculate the volume of the cylinder:
[
text{Volume} = pi times left(frac{text{bore}}{2}right)^2 times text{stroke}
]
[
text{Volume} = pi times left(frac{40 , text{mm}}{2}right)^2 times 70 , text{mm} = pi times 20^2 times 70 approx 8761.6 , text{mm}^3
]

2. Convert the volume to cubic meters:
[
text{Volume} = 8761.6 , text{mm}^3 times 10^{-9} = 8.7616 times 10^{-6}

Draftsman/ Draughtsman - Mechanical Mechanical

Ques:- What is loop or pigtail in an impulse line?

Asked In :- Chryso Group, porsche engineering, siemens energy and automations,

Right Answer:
A loop or pigtail in an impulse line is a U-shaped or coiled section of tubing that helps to prevent the entry of liquid or condensation into the pressure sensing device, allowing for accurate pressure readings.

Draftsman/ Draughtsman - Mechanical Mechanical

Ques:- What is runout? how it is measure? which is the refrence?

Asked In :- anand engineering products pvt ltd,

Right Answer:
Runout is the measure of how much a rotating part deviates from its true circular path. It is measured using a dial indicator, which is placed against the surface of the rotating part while it is spun. The reference for measuring runout is typically the axis of rotation of the part.

Draftsman/ Draughtsman - Mechanical Mechanical

Ques:- What is the difference between the heat exchanger andcooling tower???????????

Asked In :- Bharat Bijlee, HARITA TECHSERV,

Right Answer:
A heat exchanger transfers heat between two fluids without mixing them, while a cooling tower removes heat from water by evaporating a portion of it into the air.

Draftsman/ Draughtsman - Mechanical Mechanical

Ques:- What is mean ovality?, how it is measured?

Asked In :- Toyo Engineering, Delhi Metro Rail, porsche engineering,

Right Answer:
Ovality refers to the deviation of a circular shape from a perfect circle, often seen in pipes or tubes where the cross-section is more oval than round. It is measured by comparing the maximum and minimum diameters of the object, typically using calipers or specialized measuring tools. The ovality can be expressed as a percentage of the nominal diameter.

Draftsman/ Draughtsman - Mechanical Mechanical

Ques:- What is meaning of bearing nos.?

Asked In :- walton group,

Right Answer:
Bearing numbers are a standardized code that identifies the type, size, and specifications of a bearing, allowing for easy identification and selection for mechanical applications.

Draftsman/ Draughtsman - Mechanical Mechanical

Ques:- What is mean by retrofitting of machine tool please brief

Asked In :- ANSYS Software, TATA Advanced Materials,

Right Answer:
Retrofitting of a machine tool refers to the process of upgrading or modifying an existing machine with new components or technologies to improve its performance, efficiency, or capabilities without replacing the entire machine.

Draftsman/ Draughtsman - Mechanical Mechanical

Ques:- I have 3sge type g rav 4 1997 can i modyfied my engine to dual vvti 3sge

Asked In :- Daimler India Commercial Vehicles, Sea Blue Shipyard, Raster Engineers, ferrari, stelco, fulton hogan,

Right Answer:
Yes, you can modify your 3SGE engine to dual VVTi, but it will require significant modifications, including changes to the engine management system, wiring, and possibly the intake and exhaust systems.

Draftsman/ Draughtsman - Mechanical Mechanical

Ques:- Where is dolpin pile is used

Asked In :- FANUC, WAPDA Water and Power Development Authority, TC Energy, dormakaba, fev, utkarsh tubes and pipes limited,

Right Answer:
Dolphin piles are used in marine construction, typically for supporting structures like docks, piers, and jetties, as well as for mooring vessels.

Draftsman/ Draughtsman - Mechanical Mechanical

Ques:- Can we replace a pressure transmitter of range 0 to 25 Kg/cm2 by a Pressure transmitter of range 0 to 10 Kg/cm2 ?.. Will it affect 4 to 20 mA output signal which we will feed to the PLC.

Asked In :- Princess Yachts,

Right Answer:
No, you cannot replace a pressure transmitter of range 0 to 25 Kg/cm² with one of range 0 to 10 Kg/cm² without affecting the output signal. The new transmitter will not be able to measure pressures above 10 Kg/cm², which could lead to inaccurate readings and potential issues with the PLC.

Draftsman/ Draughtsman - Mechanical General Management

Ques:- How u increase sales in fmcg,or manager is ask u to increase sales in fmcg, how u can?

Asked In :- worley,

Right Answer:
To increase sales in FMCG, I would focus on the following strategies:

1. **Market Research**: Understand customer preferences and trends to tailor products accordingly.
2. **Promotions and Discounts**: Implement attractive promotions and discounts to encourage purchases.
3. **Distribution Channels**: Expand distribution channels to reach more customers, including online platforms.
4. **Brand Awareness**: Enhance marketing efforts through advertising and social media to increase brand visibility.
5. **Customer Engagement**: Foster relationships with customers through loyalty programs and feedback mechanisms.
6. **Product Placement**: Ensure optimal product placement in stores for better visibility and accessibility.
7. **Training Sales Staff**: Equip sales teams with product knowledge and selling techniques to improve customer interactions.

Draftsman/ Draughtsman - Mechanical Mechanical

Ques:- Explain QH curve of a Centrifugal Pump?. Will it ever touch X axis?. If it ever touch when? When will you go for Reciprocating pump?. why can't you use centrifugal pumps for pumping viscous fluids?. Why head of a centrifugal pump is independent of density of fluid?.

Asked In :- Skanska UK, Fisher Chennai Engineering Centre, volkerrail,

Right Answer:
The QH curve of a centrifugal pump shows the relationship between flow rate (Q) and head (H). It typically does not touch the X-axis because there is always some head generated at zero flow due to the pump's design. However, it can approach the X-axis as flow increases, especially at very high flow rates where the head drops significantly.

You would choose a reciprocating pump over a centrifugal pump when dealing with high-viscosity fluids, high-pressure applications, or when precise flow control is needed.

Centrifugal pumps are not suitable for viscous fluids because their design relies on the fluid's ability to flow easily; high viscosity can lead to reduced efficiency and cavitation.

The head of a centrifugal pump is independent of the fluid's density because the pump's operation is based on kinetic energy conversion to pressure energy, which is primarily influenced by the impeller design and speed, not the fluid density.

Draftsman/ Draughtsman - Mechanical Mechanical

Ques:- whether interchangebility is possible between JIGS & FIXTURES???

Asked In :- Tmeic International Corporation, b&r industrial automation, tenneco automotive, hella india automotive private limited,

Right Answer:
Interchangeability between jigs and fixtures is generally not possible, as they serve different purposes in the manufacturing process. Jigs are used to guide tools, while fixtures are used to hold workpieces in place.

Draftsman/ Draughtsman - Mechanical Mechanical

Ques:- When selecting psv(pressure safety valve),what are all things we have to keep it in mind?

Asked In :- Daimler India Commercial Vehicles, zamil steel, utkarsh tubes and pipes limited,

Right Answer:
When selecting a pressure safety valve (PSV), consider the following factors:

1. **Set Pressure**: Determine the pressure at which the valve should open.
2. **Flow Capacity**: Ensure the valve can handle the maximum expected flow rate.
3. **Fluid Type**: Identify whether the fluid is gas, liquid, or vapor, and its properties.
4. **Temperature**: Account for the operating temperature and any potential temperature fluctuations.
5. **Service Conditions**: Consider the environment, including corrosive or hazardous conditions.
6. **Installation Orientation**: Ensure the valve can be installed in the required position (vertical or horizontal).
7. **Code Compliance**: Adhere to relevant industry standards and regulations (e.g., ASME, API).
8. **Material Selection**: Choose materials that are compatible with the fluid and service conditions.
9. **Maintenance Requirements**: Evaluate ease of access for maintenance and testing.
10. **Safety Factor**: Include a safety margin

Draftsman/ Draughtsman - Mechanical Mechanical

Ques:- Meaning of engineering …

Asked In :- network rail, gilbarco veeder root, smud, beumer group,

Right Answer:
Engineering is the application of scientific and mathematical principles to design, build, and analyze structures, machines, and systems to solve problems and improve functionality.

A Mechanical Draftsman/Draughtsman is a skilled technical professional who serves as a vital link between the design and production phases of a project. Their primary responsibility is to create precise, detailed technical drawings and schematics that communicate the exact specifications of a mechanical system, part, or product. This work is critical for a wide range of industries, including manufacturing, automotive, aerospace, and construction, as their drawings serve as the essential blueprints for engineers, manufacturers, and technicians.

The role relies heavily on Computer-Aided Design (CAD) software, such as AutoCAD, SolidWorks, or Inventor. Using these tools, a draftsman converts an engineer’s initial design concepts and sketches into detailed 2D and 3D models. These drawings are meticulously crafted and include all the necessary information for a product to be built correctly. This information includes precise dimensions, material specifications, tolerances, and assembly instructions. They often create various views of a single part or assembly, such as orthographic projections and isometric views, to ensure there is no ambiguity in the final design.

A mechanical draftsman works in close collaboration with a team of engineers, designers, and manufacturing personnel. They are not simply drafters; they often provide valuable feedback on the practicality and manufacturability of a design, suggesting changes to improve efficiency or reduce costs. Their attention to detail is paramount, as even a small error in a drawing can lead to significant manufacturing delays, costly material waste, or even safety failures. In essence, the mechanical draftsman is the artisan of the engineering world, turning abstract ideas and calculations into the clear, structured instructions that bring new technology and products to life.

Questions in: Draftsman/ Draughtsman - Mechanical

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