20+ Draughtsman Mechanical Interview Questions and Answers

A VFD is a Variable Frequency Drive used to control the speed of an electric motor. VRF and VAV systems are different types of HVAC systems. NFPA 20 is the code used for fire pumps. Freeboard is the distance between the liquid level and the top of a tank.

• VFD stands for Variable Frequency Drive.

• It is used to control the speed of an electric motor by varying the frequency and voltage supplied to the motor.

• VFDs are commonly used in industrial applications to save energy and prov...read more

The candidate is asked to draw a model and create a dxf file for AutoCAD, GD&T Symbol, APQP, and determine the die clearance for sheet metal in a PPAP scenario.

• Create a detailed model using AutoCAD and save it as a dxf file

• Include GD&T Symbol annotations in the drawing

• Understand the APQP (Advanced Product Quality Planning) process and its requirements

• Calculate the die clearance for sheet metal based on the specific material and thickness

• Explain the PPAP (Production Part Appro...read more

The interviewee is asked to check CAD speed, answer basic trigonometry and geometry development questions.

• Use the given Head unit drg. A3 print to trace in AutoCAD and check CAD speed

• Answer basic trigonometry questions related to angles, sides, and triangles

• Answer geometry development questions related to cones, bends, and mensuration

• Demonstrate proficiency in AutoCAD software

• Show understanding of mathematical concepts and formulas

Isometric drawing is a 3D representation of an object, while auto graphics drawing is a 2D representation of an object.

• Isometric drawing shows all three dimensions of an object in a single view.

• Auto graphics drawing is a 2D representation of an object, typically used in technical drawings.

• Isometric drawings are often used in engineering and architecture to show how an object will look in 3D.

• Auto graphics drawings are commonly used in manufacturing and engineering to show the ...read more

There are three types of families in Revit: system families, loadable families, and in-place families.

• System families are predefined families that are included with Revit, such as walls, floors, and roofs.

• Loadable families are families that are created by users or downloaded from external sources and can be loaded into a project.

• In-place families are families that are created directly within a project and are specific to that project.

• Examples of system families include doors,...read more

The first step in Autocad test on desktop is to open the software and create a new drawing file.

• Open Autocad software on desktop

• Click on 'New' to create a new drawing file

• Select the appropriate units and scale for the drawing

• Begin drawing using the various tools and commands available

The scale tool in AutoCAD is used to resize objects while maintaining their proportions.

• Select the object you want to scale

• Click on the 'Scale' tool in the Modify panel

• Specify the base point for scaling

• Enter the scale factor or specify a reference length

• Press Enter to apply the scale

• For example, to scale an object by a factor of 2, enter 2 as the scale factor

Pressure vessel design code specifies the requirements for designing, manufacturing, and testing pressure vessels.

• Pressure vessel design code ensures safety and reliability of pressure vessels

• Common pressure vessel design codes include ASME Boiler and Pressure Vessel Code, EN 13445, and API 510

• Design code outlines materials, design criteria, fabrication methods, inspection procedures, and testing requirements

Types of views in mechanical drawing and their meaning of hp and lp.

• Types of views include orthographic, isometric, and perspective views.

• HP stands for Hidden Point and refers to lines that are not visible in a particular view.

• LP stands for Line of Profile and refers to the outline of the object in a particular view.

• Orthographic views show the object from different angles, while isometric views show the object in 3D.

• Perspective views show the object as it would appear to the ...read more

Yes, AutoCAD can be used with TextMirror using R.

• AutoCAD can be integrated with TextMirror to enhance drafting capabilities.

• TextMirror allows for real-time collaboration and editing of CAD drawings.

• Using R programming language, users can automate tasks and create custom functions for AutoCAD.

Types of valves include ball valves, gate valves, globe valves, butterfly valves, and check valves.

• Ball valves: used for on/off control without pressure drop

• Gate valves: used for full flow or no flow applications

• Globe valves: used for regulating flow in pipelines

• Butterfly valves: used for throttling flow

• Check valves: used to prevent backflow

Projection of drawing refers to the method of representing a 3D object on a 2D surface.

• Projection involves creating multiple views of an object from different angles

• Common types of projections include orthographic projection and isometric projection

• Each view shows different aspects of the object, such as top, front, and side views

• Projection helps in accurately representing the dimensions and features of the object

I will draw an isometric drawing of a simple cube.

• Start by drawing a square as the base of the cube

• Draw lines extending from the corners of the square at a 45 degree angle

• Connect the lines to form the sides of the cube

• Add shading to give the drawing a 3D effect

There are various types of drawings used in mechanical engineering such as assembly, detail, isometric, and exploded view.

• Assembly drawings show how parts fit together to make a machine or structure.

• Detail drawings provide information about individual parts and their dimensions.

• Isometric drawings show a 3D view of an object, with all three dimensions shown in one view.

• Exploded view drawings show how parts fit together and how they can be taken apart.

• Other types of drawings in...read more

There are several types of valves used in mechanical systems for controlling the flow of fluids or gases.

• Gate valves

• Ball valves

• Butterfly valves

• Check valves

• Globe valves

• Needle valves

Pipe types include steel, copper, PVC, PEX, and galvanized.

• Steel pipes are commonly used for high-pressure applications.

• Copper pipes are durable and resistant to corrosion.

• PVC pipes are lightweight and easy to install.

• PEX pipes are flexible and suitable for hot and cold water systems.

• Galvanized pipes are coated with zinc to prevent rusting.

Types of dishends include torispherical, ellipsoidal, hemispherical, conical, and flat.

• Torispherical dishend has a dish radius equal to the major radius of the torus

• Ellipsoidal dishend has a dish radius equal to the minor radius of the ellipse

• Hemispherical dishend has a dish radius equal to the radius of the hemisphere

• Conical dishend has a dish radius equal to the slant height of the cone

• Flat dishend is a flat plate welded to the end of the vessel