Machine Drawing and CAD Viva Questions and Answers

Machine Drawing and CAD Viva Questions and Answers

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We have added Machine Drawing and CAD Viva Questions and Answers for the diploma mechanical II year / III Semester as PDF 

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Note: 1. These are sample questions only, the student may study full exercises

1. Sleeve & Cotter joint

What is Sleeve and Cotter Joint?

Sleeve and cotter joint is a type of joint use that usually connects two identical coaxial cylindrical rods. It includes one sleeve and two wedge-shaped tapered coaters. Suitable slots cut into sleeves and cylindrical rods.

What is the use of sleeve and cotter Joint?

Cotter joint is used to connect two rods subjected to axial tensile or compressive loads. Cotter joint is widely used to connect the piston rod and cross head of the steam engine, so as a joint between the piston rod and the tailor pump rod, foundation bolt etc

Mention the applications of sleeve and cotter joints.

• It is used to connect piston rods in a crosshead in a steam engine.
• It is used to connect the piston rod with its extension.
• It is also used in bicycles to connect pedals to sprocket wheels.
• Foundation Bolt
• The joint between the slide spindle and the fork of the valve mechanism
• Cotter and dowel arrangement to join the two halves of a flywheel.

2. Screw jack

What is screw jack?

A screw jack is a simple machine. It is used to lift cars or heavy automobiles. It consists of a long screw rod which passes through a threaded block B and a handle . The distance between two consecutive thread is known as pitch of screw.

Mention the applications of Screw Jack?

Screw Jack Used in

• Paper, press, Printing Industry
• Sheet metal forming machinery
• Machine lifting applications
• Platform Lifting applications
• Food processing industries

3. Plummer Block

What is Plummer block?

A Plummer block is a pedestal used to provide support for a rotating shaft with the help of compatible bearings & various accessories

Where are pillow blocks used?

Pillow block bearing units are usually a housed bearing with a machined mounting surface and are used in mechanical power transmission systems to support shafts and couplings.

4. Simple Eccentric

What is simple eccentric?

A simple eccentric is used to convert rotary motion into linear reciprocating motion

5. Machine Vice

What is Machine Vice?

A machine vice — a mechanical device designed to hold workpieces still during machining operations — can function as manual components or as a machining device. Many typical manufacturing facilities use machining vises for applications that have tight tolerances and require high precision.

6. Protected type flanged coupling

What is coupling?

A coupling is a device used to connect two shafts together at their ends for the purpose of transmitting power. The primary purpose of couplings is to join two pieces of rotating equipment while permitting some degree of misalignment or end movement or both.

What is protected type flange coupling?

In this type of coupling bolts and nuts are protected by flanges on the two halves of the coupling, in order to avoid danger to the workman. … The flanges are held together by means of tapered headless bolts.

CAD VIVA QUESTIONS

1) What is Autocad?

Autocad is a software program built to design and shape the 2-D and 3-D images.  It provides the tools by which a detail design of the product can be done. It also has the option to create detailed design layout, which can be automatically drawn by using source model.

2) What are the uses of Autocad?

Autocad can be used by the professionals to visualize the imaginary view of the product on a computer system. In Autocad, it is possible by the drafter to make the changes in the product before it gets finalized for design. It also gives the freedom for the designer to implement their various ideas and represent them to the suppliers or their clients.

3. What are the applications of CAD?Design of machine elements, CNC machine tools, robotics etc Panel design and circuit layout Mapping, building plans, contour plotting and structural drawing Interior design and modeling
4. Define polar coordinates.Values are locating a point in space that describes its location relative to the last point picked as defined by an angle and s distance
5. Define MIRRORA command that makes a copy of selected objects and flips the copy around a specified line to produce a reciprocal image of those objects
6. What is an ortho mode?An on/off setting that, when on forces lines to be drawn and objects to be moved in a horizontal or vertical direction only
7. What are the advantages of CAD?Greater productivity of the designer, improvement of design quality Easier design, calculation and analysis, quicker rate producing drawings, more accuracy of drawings, colour graphics is possible.
8. What is an object snap mode?Any of a set of tools precisely picking strategic points on an object, including end point, midpoint, center, and so on. It is casually called osnap.

AutoCad Commands

AutoCAD Commands	Explanation
AL	ALIGN / Aligns objects with other objects in 2D and 3D
AR	ARRAY / Creates multiple copies of objects in a pattern
BR	BREAK / Breaks the selected object between two points
C	CIRCLE / Creates a circle
CHA	CHAMFER / Bevels the edges of objects
COL	COLOR / Sets the color for new objects
CO	COPY / Copies objects a specified distance in a specified direction
CYL	CYLINDER / Creates a 3D solid cylinder
D	DIMSTYLE / Creates and modifies dimension styles
DI	DIST / Measures the distance and angle between two points
DIV	DIVIDE / Creates evenly spaced point objects or blocks along the length or perimeter of an object
E	ERASE / Removes objects from a drawing
EL	ELLIPSE / Creates an ellipse or an elliptical arc
EX	EXTEND / Extends objects to meet the edges of other objects
EXIT	QUIT / Exits the program
EXT	EXTRUDE / Extends the dimensions of a 2D object or 3D face into 3D space
F	FILLET / Rounds and fillets the edges of objects
H	HATCH / Fills an enclosed area or selected objects with a hatch pattern, solid fill, or gradient fill
I	INSERT / Inserts a block or drawing into the current drawing
L	LINE / Creates straight line segments
LA	LAYER / Manages layers and layer properties
LEN	LENGTHEN / Changes the length of objects and the included angle of arcs
M	MOVE / Moves objects a specified distance in a specified direction
ME	MEASURE / Joins similar objects to form a single, unbroken object
MI	MIRROR / Creates a mirrored copy of selected objects
O	OFFSET / Creates concentric circles, parallel lines, and parallel curves
OS	OSNAP / Sets running object snap modes
PO	POINT / Creates a point object
POL	POLYGON / Creates an equilateral closed polyline
PR	PROPERTIES / Displays Properties palette
PRINT	PLOT / Plots a drawing to a plotter, printer, or file
PYR	PYRAMID / Creates a 3D solid pyramid
Q	QSAVE / Saves the current drawing
RE	REGEN / Regenerates the entire drawing from the current viewport
REC	RECTANG / Creates a rectangular polyline
REN	RENAME / Changes the names assigned to items such as layers and dimension styles
REV	REVOLVE / Creates a 3D solid or surface by sweeping a 2D object around an axis
RO	ROTATE / Rotates objects around a base point
S	STRETCH / Stretches objects crossed by a selection window or polygon
SC	SCALE / Enlarges or reduces selected objects, keeping the proportions of the object the same after scaling
SEC	SECTION / Uses the intersection of a plane and solids, surfaces, or mesh to create a region
SL	SLICE / Creates new 3D solids and surfaces by slicing, or dividing, existing objects
SO	SOLID / Creates solid-filled triangles and quadrilaterals
SPL	SPLINE / Creates a smooth curve that passes through or near specified points
ST	STYLE / Creates, modifies, or specifies text styles
STA	STANDARDS / Manages the association of standards files with drawings
SU	SUBTRACT / Combines selected 3D solids, surfaces, or 2D regions by subtraction
TB	TABLE / Creates an empty table object
TH	THICKNESS / Sets the default 3D thickness property when creating 2D geometric objects
TOL	TOLERANCE / Creates geometric tolerances contained in a feature control frame
TR	TRIM / Trims objects to meet the edges of other objects
TS	TABLESTYLE / Creates, modifies, or specifies table styles
UN	UNITS / Controls coordinate and angle display formats and precision.
UNI	UNION / Unions two solid or two region objects.
V	VIEW / Saves and restores named views, camera views, layout views, and preset views.
X	EXPLODE / Breaks a compound object into its component objects.