# Engineering Drawing Questions and Answers – Planes of Projections and Four Quadrants

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This set of Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Planes of Projections and Four Quadrants”.

1. The 2nd quadrant is in which position?
a) Below H.P, behind V.P
b) Above H.P, behind V.P
c) Above H.P, in-front of V.P
d) Below H.P, in-front of V.P

Explanation: The position of reference planes will be similar to quadrants in x, y plane co-ordinate system. As the 2nd quadrant lies above the x-axis and behind the y-axis here also the 2nd quadrant is above H.P, behind V.P.

2. The 3rd quadrant is in which position?
a) Below H.P, behind V.P
b) Above H.P, behind V.P
c) Above H.P, in-front of V.P
d) Below H.P, in-front of V.P

Explanation: The position of reference planes will be similar to quadrants in x, y plane co-ordinate system. As the 3rd quadrant lies below the x-axis and behind the y-axis here also the 3rd quadrant is below H.P, behind V.P.

3. The 4th quadrant is in which position?
a) Below H.P, behind V.P
b) Above H.P, behind V.P
c) Above H.P, in-front of V.P
d) Below H.P, in-front of V.P

Explanation: The position of reference planes will be similar to quadrants in x, y plane co-ordinate system. As the 4th quadrant lies below the x-axis and in front of the y-axis here also the 4th quadrant is below H.P, in front of V.P.

4. The 1st quadrant is in which position?
a) Below H.P, behind V.P
b) Above H.P, behind V.P
c) Above H.P, in-front of V.P
d) Below H.P, in-front of V.P

Explanation: The position of reference planes will be similar to quadrants in x, y plane co-ordinate system. As the 1st quadrant lies above the x-axis and in front of the y-axis here also the 1st quadrant is above H.P, in front of V.P.

5. The position of the views with respect to the reference line will not change according to the quadrant in which the object may be situated.
a) True
b) False

Explanation: The position of the views with respect to the reference line will change according to the quadrant in which the object may be situated because the representation of views will on 2 dimensional sheet for that the planes has to rotate and with respective to reference line and this will be different for different quadrant.

6. The first and the third quadrants are always opened out while rotating the planes.
a) True
b) False

Explanation: According to the standards it is made that the planes rotate in a clockwise direction while drawing the orthographic projections of objects on the different quadrant. So as the horizontal rotates 90 degrees in clockwise with respect to reference line the views in 2nd and 4th quadrants overlap but in 1st and 3rd the views will not coincide so they are said to be opened.

7. An object is kept in one of the quadrants of principal planes of projection, for both the front view and top view of the object, the view came first and then the object (the observer is at the top right side of principal planes). The object is in which quadrant?

Explanation: If we imagine the principal planes and the observer at the top right side of those planes we can clearly watch the positions of object with respect to their view. Here the object is in 3rd quadrant so view will come first.

8. An object is kept in one of the quadrants of principal planes of projection, for both the front view and top view of the object the object came first and then the views on planes (the observer is at top right side of principal planes). The object is in which quadrant?

Explanation: If we imagine the principal planes and the observer at top right side of those planes we can clearly watch the positions of object with respect to their view. Here the object is in 1st quadrant so object will come first in both the views.

9. An object is kept in one of the quadrants of principal planes of projection, for the front view the view is first and object is next and for top view the object came first and then the view on plane (the observer is at top right side of principal planes). The object is in which quadrant?

Explanation: If we imagine the principal planes and the observer at top right side of those planes we can clearly watch the positions of object with respect to their view. Here the object is in 2nd quadrant so view will come first for front view and object will come first for top view.

10. The line formed by intersection of principal planes is called _____________
a) projection line
b) origin line
c) line of intersection
d) reference line

Explanation: The line formed by an intersection of principal planes or reference planes of projection that is the vertical plane or frontal plane and horizontal plane is called reference line which is denoted by the letters xy.

11. The vertical plane is also called _____________
a) straight plane
b) perpendicular plane
c) frontal plane
d) pole plane

Explanation: Vertical plane will be vertical to ground and perpendicular with horizontal plane. As the observer will always be at right-top side of planes of projections the front view will always be placed on vertical plane only so the vertical plane is also called frontal plane.

12. The negative horizontal plane and positive horizontal makes _____ angle with each other.
a) 90 degrees
b) 180 degrees
c) 120 degrees
d) 270 degrees

Explanation: The negative horizontal plane means the part of horizontal plane which lies in 2nd quadrant. The positive and negative planes are parallel to each other so the angle between the parallel planes is always 180 degrees.

13. The positive vertical plane and positive horizontal plane makes _______ angle with each other in anti clockwise direction.
a) 180 degrees
b) 270 degrees
c) 0 degrees
d) 90 degrees

Explanation: Given the direction is anti-clockwise direction so the angle in 270 degrees if it is given clockwise direction the angle should be 90 degrees since the given planes are consecutive planes in planes of projection.

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