# Engineering Drawing Questions and Answers – Washers

This set of Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Washers”.

1. A washer ensures that the nut screwed-on tightly.
a) True
b) False

Explanation: A washer is the metallic or non-metallic cylindrical disc placed below the nut. It prevents the wear of fastening elements from wearing out from nut when screwed-on, spreads pressure uniformly and thus helps in fastening nut tightly.

2. When the nut diameter is D, what will be the approximate diameter of the washer?
a) D+0.5mm
b) D+1mm
c) 2D+3mm
d) 2D+0.5mm

Explanation: A washer is a cylindrical disc placed below the nut when the given nut diameter is D, then the diameter of the hole is approximately considered as 2D+3mm, and the diameter of the hole is taken as D+0.5mm.

3. When the nut diameter is D, the diameter of the hole in the washer is ______
a) D+0.5mm
b) D+1mm
c) 2D+3mm
d) 2D+0.5mm

Explanation: A washer is a cylindrical disc placed below the nut when the given nut diameter is D, then the diameter of the hole is approximately considered as 2D+3mm, and the diameter of the hole is taken as D+0.5mm.

4. When the diameter of the bolt is D, then the thickness of the washer is ______
a) 0.12D
b) 0.5D
c) 0.3D
d) D

Explanation: A washer needs to distribute pressure, decrease wear and tear, and tighten fastening, so it needs to be having an optimum thickness. So when a nut diameter is taken D we approximately consider the washer diameter as 0.12D.

5. Which of the following is true for the type-A washer?
a) It is a flat washer
b) It has a slot cut from its center to its perimeter
c) It has a flat cut on its perimeter
d) They are also called as finishing washers

Explanation: Type-A washers are standard flat washers. Type-C washers have a slot cut from its center to its perimeter. Type-D washers have a flat cut on its perimeter. Countersunk washers are also called as finishing washers.

6. Which of the following washers are considered as SAE washers?
a) Type-A plain washers
b) Type-C
c) Type-D
d) Type-B

Explanation: SAE washers are designing for fine threaded bolt and nuts which are flat and light in weight. They are Type-A plain flat washers designed under standard conditions. They are defined by a gaged number.

Sanfoundry Global Education & Learning Series – Engineering Drawing.