# Engineering Drawing Questions and Answers – True Length of a Straight Line and its Inclinations with the Reference Planes

This set of Engineering Drawing Interview Questions and Answers for Experienced people focuses on “True Length of a Straight Line and its Inclinations with the Reference Planes”.

1. A line which is parallel to vertical plane and making an angle of 50 degrees with horizontal has a length of 5 cm from side view. What is its true length?
a) 6.52 cm
b) 7.77 cm
c) 3.2 cm
d) 3.8 cm

Explanation: True length of line parallel to vertical plane and making angle with horizontal plane can be of two values either from top view or side view but from front view the length will be given length. As here it is given side view L= 5/sin (50).

2. A line which is parallel to profile plane and making an angle of 40 degrees with horizontal has a length of 4 cm from top view. What is its true length?
a) 3.06 cm
b) 5.22 cm
c) 6.22 cm
d) 2.57 cm

Explanation: True length of line parallel to profile plane and making angle with horizontal plane can be of two values either from top view or front view but from side view the length will be given length. As here it is given top view L= 4/cos (40).

3. A line which is parallel to vertical plane and making an angle of 20 degrees with profile has a length of 5 cm from top view. What is its true length?
a) 1.71 cm
b) 14.61 cm
c) 5.32 cm
d) 4.69 cm

Explanation: True length of line parallel to vertical plane and making angle with profile plane can be of two values either from top view or side view but from front view the length will be given length. As here it is given top view L= 5/sin (20).

4. A line which is parallel to vertical plane and making an angle of 50 degrees with horizontal plane has a length of 5 cm from side view. What is its true length?
a) 3.2 cm
b) 3.8 cm
c) 7.77 cm
d) 6.52 cm

Explanation: True length of line parallel to vertical plane and making angle with horizontal plane can be of two values either from top view or side view but from front view the length will be given length. As here it is given side view L= 5/cos (50).

5. A line which is parallel to horizontal plane and making an angle of 75 degrees with vertical has a length of 5 cm from top view. What is its true length?
a) 4.82 cm
b) 1.29 cm
c) 19.31 cm
d) 5 cm

Explanation: True length of line parallel to vertical plane and making angle with horizontal can be of two values either from top view or side view but from front view the length will be given length. As here it is given top view the length given is true length.

6. A line which is parallel to vertical plane is made to turn to an angle of 50 degrees with horizontal and then turned to an angle of 40 degrees with vertical plane and now the line has a length of 5 cm from top view. What is its true length?
a) 7.77 cm
b) 6.52 cm
c) 3.8 cm
d) 3.2 cm

Explanation: True length of line parallel to vertical plane and making angle with horizontal can be of two values either from top view or side view but from front view the length will be given length. As here it is given top view L=5/cosine (50).

7. A line which is parallel to horizontal plane is made to turn to an angle of 35 degrees with vertical and then turned to an angle of 45 degrees with horizontal plane and now the line has a length of 8.5cm from top view. What is its true length?
a) 7.37 cm
b) 12.02 cm
c) 10.9 cm
d) 6.01 cm

Explanation: True length of a line parallel to horizontal plane and making angle with respect to horizontal can be of two values either from top view or side view but from front view the length will be given length. As here it is given top view L= 8.5/cos(45).

8. A line which is parallel to horizontal plane is made to turn to an angle of 35 degrees with vertical and then turned to an angle of 45 degrees with horizontal plane and now the line has a length of 9 cm from front view. What is its true length?
a) 7.37 cm
b) 5.16 cm
c) 10.9 cm
d) 15.69 cm

Explanation: True length of a line parallel to horizontal plane and making angle with vertical can be of two values either from front view or side view but from top view the length will be given length. As here it is given front view L = 9/cos(35).

9. A line parallel to profile plane is held at 30 degrees with horizontal plane and front view gives 2 cm of length. What is the true length of line?
a) 1 cm
b) 1.73 cm
c) 2.3 cm
d) 4 cm

Explanation: True length of line parallel to profile plane and making angle with horizontal can be of two values either from top view or front view but from side view the length will be given length. As here it is given front view L= 2/sin (30).

10. A line parallel to vertical plane is held at 35 degrees with horizontal plane and side view gives 3 cm of length. What is the true length of line?
a) 5.2 cm
b) 3.66 cm
c) 2.45 cm
d) 1.72 cm

Explanation: True length of line parallel to vertical plane and making angle with horizontal can be of two values either from top view or side view but from front view the length will be given length. As here it is given side view L= 3/sin (35).

11. A line parallel to profile plane is held at 25 degrees with vertical plane and side view gives 2 cm of length. What is the true length of line?
a) 4.7 cm
b) 2 cm
c) 2.2 cm
d) 0.84 cm

Explanation: True length of line parallel to profile plane and making angle with vertical can be of two values either from top view or front view but from side view the length will be given length. As here it is given side view the length will be true length.

12. A line parallel to profile plane is held at 85 degrees with vertical plane and top view gives 20 cm of length. What is the true length of line?
a) 1.7 cm
b) 229 cm
c) 20.07 cm
d) 19.9 cm

Explanation: True length of line parallel to profile plane and making angle with vertical plane can be of two values either from top view or front view but from side view the length will be given length. As here it is given top view L= 20/cos(5).

13. A line parallel to horizontal plane is held at 65 degrees with profile plane and front view gives 6 cm of length. What is the true length of line?
a) 5.43 cm
b) 14.19 cm
c) 2.5 cm
d) 6.62 cm

Explanation: True length of line parallel to horizontal plane and making angle with profile plane can be of two values either from front view or side view but from top view the length will be given length. As here it is given front view L= 6/sin (65).

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