Machine Drawing Questions and Answers Part-2

1. The method of ________ projection is universally adopted for the purpose of engineering drawing.
a) Orthographic
b) Isometric
c) Oblique
d) Perspective

Answer: a
Explanation: By the orthographic projection method the description of the object regarding its shape and size is conveyed in such definite and unmistakable terms that it can be constructed as required. Isometric, Oblique and Perspective projection methods give the pictorial view, which shows only the outside appearance of a machine.

2. Single view may be enough to describe the shape of _______
a) Thick objects
b) Thin objects
c) Symmetric objects
d) Vertical objects

Answer: b
Explanation: For thin objects, one view is sufficient to describe the shape. Minimum two to three views are required for describing shape of the thick, symmetric and vertical objects.

3. Sectional views can be drawn to show the ____________
a) Hatching lines
b) Outside views
c) Internal details
d) Symmetric objects

Answer: c
Explanation: Sectional views are sometimes drawn to show the internal details, which are not possible in outside views. These sectional parts are shown by hatching lines.

4. While drawing an object on paper, which of the following method is not suitable regarding to its size?
a) Enlarge suitably if it is too small.
b) Reduce if it is bigger than the paper size
c) Always should be drawn of the same size
d) Drawn of the same size if it can be accommodated on the paper

Answer: c
Explanation: It is not always possible to draw the object of given size. It is to be enlarged or reduced in size suitably for easy readability.

5. _______ is an object seen by a human eye
a) Perspective view
b) Axonometric view
c) Orthogonal view
d) Isometric view

Answer: a
Explanation: An object seen by a human eye is perspective view. In an orthographic view, the object is seen from different directions. The object is first rotated in horizontal plane about vertical axis to make an angle with the picture plane in Isometric view, which is a type of axonometric view.

6. The system in which variation in size is accepted is termed as __________
a) Limit system
b) Tolerance System
c) Limit and tolerance system
d) Variable system

Answer: a
Explanation: In production line since it is impossible to make a part of exact drawing due to the inaccuracy of machine, setting and measurement thus some deviation is allowed in given maximum and minimum limit. The system in which this variation is accepted is termed as a Limit system and the allowable deviation are termed as tolerances.

7. What is the basic size?
a) Size calculated by the design engineer to withstand the stress coming in component
b) Size exactly of that of given object under consideration
c) Size of the object with given deviations
d) Size with which a job come out of the shop

Answer: a
Explanation: A design engineer calculate the size of an object using theory of failure and then give the size to the object with which an object of given material can withstand the stresses coming in the component, this size is termed as basic size. It is the size to which limits of tolerance are assigned

8. What is the actual size?
a) Dimension of a component on paper
b) Dimension of the component manufactured
c) Size of the component as per theory of failure
d) Size of the object with all the tolerances

Answer: b
Explanation: The actual size the dimension obtained of a product when it is manufactured and come out of the shop. It may not be of the same size as given on the paper and comes in the dimension between the given tolerances. Simply the size of the manufactured component is actual size.

9. Tolerance is ___________
a) Difference between the basic size and maximum limit
b) Difference Between the minimum and basic size
c) Difference between the maximum and minimum limit size
d) The maximum size of the component allowed

Answer: c
Explanation: Tolerance is the difference between the maximum and minimum deviation that can be given to a component size thus tolerance is defined as the difference between the maximum and minimum limit size.

10. Cost of manufacturing is ____________
a) Inversely proportional to the amount of tolerance specified
b) Directly proportional to the amount of tolerance specified
c) Does not depends on tolerance specified
d) Does depends non-linearly

Answer: a
Explanation: Generally tolerance is provided in the narrow region, however, narrower the tolerance more difficult it is to manufacture a component thus the cost of manufacturing does depend on the tolerance specified and it is inversely proportional to the tolerance provided.