A4 - P8 - Test you Knowledge

Test your knowledge by answering the following questions.

• An isometric drawing is a true 3D representation. True or false?

False - An isometric drawing has only two dimensions, width and height. The appearance of depth is an illusion

• Oblique cabinet projection produces a distorted representation of the object that it portrays. True or false?

False - Because we shorten the receding lines, the image produced gives a better representation of the object we are drawing.

• Sketches are drawn to strict standards. True or false?

False - We draw to strict standards when producing ‘drawings’

• A diameter is half the radius of a circle. True or false?

False - A radius is half the diameter, conversely, a diameter is twice the radius.

• Circles that are said to be concentric always share the same centre. True or false?

True

• Dimension values should be readable from:

1. a) all sides of the drawing
2. b) the top and bottom sides of the drawing
3. c) the bottom and left-hand sides of the drawing
4. d) the bottom and right-hand sides of the drawing.

‘D’

• State which A-size paper for drawings having the following widths and heights (all dimensions are mm):

1. a) 420 × 297                        A3
2. b) 594 × 420                        A2
3. c) 297 × 210                        A4
4. d) 841 × 594                        A1

• Identify the following abbreviations that may appear on drawings.

1. a) CL             Centreline
2. b) DIA           Diameter
3. c) NO            Number
4. d) PCD         Pitch-circle diameter

• Only one of the two following statements is true; which is it?

1. a) In first angle projection, the view as seen by the observer is projected onto a plane behind the object.
2. b) In first angle projection, the view as seen by the observer is projected onto a plane in front of the object.

• A length of bar has the linear dimension 85.5 ± 0.01. What are the maximum and minimum acceptable lengths for the bar?

The acceptable size would lie between 85.49 and 85.51 mm

1. A drawing of a component on a circuit board, the scale of which is given as 5:1, has a line representing one side of a rectangular component drawn to a length of 50mm. What is the actual length of the side of the rectangular component?

5:1 means that the object has been drawn five times larger than the real object. The actual length of the side of the component will therefore be 10 mm.

• On a second drawing that shows the layout of a turbine house, and with the scale given as 1:50, a line representing one side of the turbine house has been drawn to a length of 500mm. What is the actual length of the side of the turbine house?

The scale 1:50 means that lines on the drawing will be 1/50th the size of the actual component. A line of 500 mm length will represent 50 × 500 mm or 25000 mm.

• Hatching is used on drawings to:

1. a) show where an object has been sectioned
2. b) indicate where the dimensions should be placed
3. c) enhance the appearance of the drawing
4. d) help the CAD program run efficiently.

• When the snap feature is used in CAD drawings:

1. a) the program will close by pressing the Ctrl key
2. b) lines will only be drawn either horizontally or vertically
3. c) a series of dots will be displayed on the screen
4. d) the cursor will move in incremental steps.

• In CAD drawing, a circumscribed polygon is one in which:

1. a) a polygon shares the same centre as a circle of the same size
2. b) a polygon is drawn around the outside of a circle
3. c) a polygon is drawn and then a circle is drawn on its inside
4. d) a polygon cuts the circumference of a circle an even number of times.

http://engineeringlevel3.co.uk/test-your-knowledge

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Dominic Clifford 

Twitter - @clifford_96