# Engineering Drawing Questions and Answers – Nut and Washers

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

1. The angle of chamfer for hexagonal and square nut is ____ degrees as per standards.
a) 30
b) 45
c) 60
d) 15

Explanation: The upper corners of this nut are rounded-off or chamfered. The chamfering is generally conical. The angle of chamfer is 30-45 degrees with the base of the nut. Due to chamfering, an arc is formed on each vertical face and circle is formed on top surface.

2. The angle through which the spanner will have to be turned to get next hold is ____ degrees in case of hexagonal shape.
a) 90
b) 60
c) 30
d) 45

Explanation: The angle through which the spanner will have to be turned to get next hold is 60 degrees in case of hexagonal shape as 360/6 is 60 degrees. In case of square nut the spanner can have better hold but the angle is 90 degrees so it is more convenient to use hexagonal nut.

3. Width across the flats in case of hexagonal nut is___ where D is the diameter of the shank.
a) 2D
b) 1.5D +3mm
c) 1.4D
d) 1.5D

Explanation: Width across the flats in case of hexagonal nut is 1.5D+3mm where D is the diameter of shank, thickness or height of nut is D itself and distance across diagonally opposite corners in case of hexagonal nut is 2D.

4. Distance across diagonally opposite corners in case of hexagonal nut is ______ where D is nominal diameter.
a) 2D
b) 1.5D +3mm
c) 1.4D
d) 1.5D

Explanation: Width across the flats in case of hexagonal nut is 1.5D+3mm where D is the diameter of shank, thickness or height of nut is D itself and distance across diagonally opposite corners in case of hexagonal nut is 2D.

5. What is the name of the nut which is a hexagonal nut with a washer?
a) Dome nut
b) Wing nut
c) Flanged nut
d) Cap nut

Explanation: Flanged nut is hexagonal nut with a washer that is a flat circular disc attached to it. It is thus provided with a larger bearing surface. A bolt can be used in a comparatively large-size hole with help of this nut. It is widely used in automobiles.
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6. What is the name of the nut which is a hexagonal nut provided with a cylindrical cap?
a) Dome nut
b) Wing nut
c) Flanged nut
d) Cap nut

Explanation: Cap nut is a hexagonal nut provided with a cylindrical cap at the top to protect the end of the bolt from corrosion. It also prevents leakage through the threads. Flanged nut is hexagonal nut with a washer that is a flat circular disc attached to it.

7. What is the name of the nut which is a cap nut with spherical dome at the top?
a) Dome nut
b) Wing nut
c) Flanged nut
d) Cap nut

Explanation: It is a form of cap nut with spherical dome at top. Flanged nut is hexagonal nut with a washer that is a flat circular disc attached to it. Cap nut is a hexagonal nut provided with a cylindrical cap at the top.

8. What is the name of the nut which can be easily operated by the thumb and a finger?
a) Ring nut
b) Wing nut
c) Cap nut
d) Flanged nut

Explanation: Wing nut can be easily operated by the thumb and a finger and is used where it is required to be adjusted frequently. It is used in a hacksaw. Cap nut is a hexagonal nut provided with a cylindrical cap at the top.

9. What is the name of the nut which is in form of a ring provided with slots in the curved surface for c-spanner?
a) Ring nut
b) Wing nut
c) Capstan nut
d) Flanged nut

Explanation: Ring nut is in form of a ring provided with slots in the curved surface for a special C-spanner. These nuts are generally used in pairs, one nut acting as a lock-nut for the other. Wing nut can be easily operated by the thumb and a finger.

10. What is the outer diameter of washer when a nominal diameter of bolt is 5 mm?
a) 13 mm
b) 15 mm
c) 10 mm
d) 12 mm

Explanation: When nominal diameter of bolt is D the thickness of the washer is 0.12D and outer diameter is 2D+3 mm and inner diameter is D+0.5mm. Here D is 5 mm so 2D+3 mm = 2 x 5+3= 10+3 = 13 mm.

11. What is the thickness of washer when a nominal diameter of bolt is D?
a) 0.12D
b) 0.1D
c) D
d) 0.09D

Explanation: Washer is a cylindrical piece of metal placed below the nut to provide smooth bearing surface. The thickness of washer when nominal diameter of the bolt is D is 0.12D and outer diameter is 2D+3 mm and inner diameter is D+0.5mm.

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