# Mechanical Behaviour Questions and Answers – Notch-Bar Impact Test

This set of Mechanical Behaviour Multiple Choice Questions & Answers (MCQs) focuses on “Notch-Bar Impact Test”.

1. Kinetic energy of Izod hammer is given as _________
a) wh-wh’
b) wh
c) whg
d) wh2

Explanation: Kinetic energy is equal to wh. It is the maximum energy that the hammer has just before hitting the specimen. w is the weight of hammer and h is height.

2. Work of fracture is given by __________
a) wh
b) whg
c) wh-wh’
d) wh2

Explanation: Work of fracture is the energy absorbed by the sample just before fracture. It is wh-wh’. Here h’ is height rise of centre of gravity of hammer.

3. Standard specimen has v-notch of ___________ depth.
a) 1mm
b) 2mm
c) 3mm
d) 4mm

Explanation: Standard specimen is used for Charpy test. It has a V notch in the middle. It is of depth 2mm.

4. What position is used for placing specimen in anvil for Izod test?
a) Supported vertical
b) Freely vertical
c) Supported horizontally
d) Freely horizontally

Explanation: The specimen is supported in Izod test. It is kept vertical in this case. Notch is facing the striking hammer.

5. What is the cross section of a standard specimen for impact testing?
a) 10mm×10mm
b) 10mm×20mm
c) 20mm×20mm
d) 15mm×20mm

Explanation: Standard specimen cross section may be round or square. When it is square, it is kept 10mm×10mm. V-notch may be in middle.
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6. In _________ test, there are two kinds of notches.
a) Izod
b) Tensile
c) Charpy
d) Leeb

Explanation: Tensile test doesn’t involve notches. In the Izod test, there is only one type of notch. In Charpy, there are two type notches of V and U type.

7. Izod uses _________ hammer as striker and Charpy use _________ hammer.
a) Farming, farming
b) Farming, Ball pin
c) Ball pin, forming
d) Ball pin, ball pin

Explanation: Different hammers are used as striker in both test. Izod uses forming hammer. Charpy uses ball pin hammer.

8. What are specimen dimensions for a Charpy test?
a) 75×10×10mm
b) 55×10×10mm
c) 65×10×10mm
d) 85×10×10mm

Explanation: Charpy specimen’s dimensions are 55×10×10mm. Izod specimen dimensions are 75×10×10mm. Notch is placed at the middle in Charpy test.

9. Which impact test would you use for duralumin?
a) Charpy (U notch)
b) Izod
c) Charpy (V notch)
d) No need

Explanation: Duralumin is FCC structure material. It doesn’t undergo ductile-brittle transition. So impact test is not performed.

10. Dynamic tests are generally applied to _______
a) Austenitic stainless steel
b) Duralumin
c) Single phase brass
d) Tool steels

Explanation: Dynamic tests are generally applied to tool steels. Because these are BCC structure, and undergo transition. Austenitic steels, duralumin and brass are of FCC structure.

11. Izod impact test is preferred for plastics.
a) True
b) False

Explanation: Plastics are tested via Izod test. Charpy has its advantages for metallic materials.

12. In a Charpy test, compressive stresses form around the notch.
a) True
b) False

Explanation: In the Izod test, compressive stresses form around the notch. While specimen is kept free in Charpy. So no generation of such stresses takes place.

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