Try each original question before you open its answer. They cover the four lessons in orthographic views, in first angle projection.
Questions
1. Which measurement do the front and top views share?
Answer
Width. Both show how wide the object is, which is why their features line up vertically.
2. A block has a front view of 45 wide and 30 high, and a top view of 45 wide and 20 deep. What are the dimensions of the side view?
Answer
The side view shows depth and height: 20 mm wide and 30 mm high.
3. A front view is a 50 × 30 rectangle with a dashed horizontal line at height 12 from the bottom. The top view is a plain 50 × 25 rectangle. What could the dashed line mean?
Answer
It is a hidden edge inside the object at height 12, such as a hole or pocket that does not break the front face. The plain top view shows no opening on top, so the feature is opened from another side.
4. The front view is an L-shape: 40 wide, 30 high on the left half (20 wide) and 15 high on the right half. The top view is 40 × 25. Give the side view (from the left) outline and any dashed line.
Answer
Outline 25 wide and 30 high. The lower right part is behind the tall left part, so there is a dashed line at height 15.
5. A cylinder of diameter 24 mm and height 40 mm stands upright. Describe the front, top and side views.
Answer
The front and side views are both rectangles 24 wide and 40 high. The top view is a circle of diameter 24 with a centre cross.
6. A block 60 × 40 × 25 has a hole of diameter 16 mm drilled straight through from top to bottom, centred. State the dashed lines in the front view.
Answer
Two dashed vertical lines running the full height of 25 mm, at (60 − 16) ÷ 2 = 22 mm and 38 mm from the left edge.
7. A dashed line and a solid line fall in exactly the same place in one view. Which do you draw?
Answer
The solid line. Visible edges take priority, and the dashed line underneath adds no information.
8. A front view shows a step at x = 35 from the left, and the top view shows the matching line at x = 30. Name the error type and give two ways to decide which view is wrong.
Answer
The views disagree on the step position (a width-alignment error). Check the stated dimension in the question, and carry a projection line from one view to the other to see which edge it meets.
If you got these wrong
- Questions 1 and 2: reread relating front, top and side views.
- Questions 3 and 4: reread inferring a missing view from two views.
- Questions 5 to 7: reread distinguishing visible and hidden features.
- Question 8: reread checking alignment and dimensions across views.
Next, see how the same objects look in pictorial representations.
If you want a teacher to set new three-view questions and check your working, see online one-to-one Engineering Drawing tuition.