Question Paper Format -em-model-2019.docx

MAILAM ENGINEERING COLLEGE, MAILAM (Approved by AICTE, New Delhi, Affiliated to Anna University Chennai) A TATA Consultancy Services Accredited Institution Department of Mechanical Engineering

Test

Model

Sub/Code:

ME8491/ENGINEERING METALLURGY

Year / SEM:

2ND / 4th

Date:

06-04-2019

Time:

3 HRS

Marks

100

PART – A CO

Level

Q.no

2

1.

State Hume Rothery’s rules for formation of substitutional solid solutions.

2

2.

State Gibb’s phase rule?

2

3.

Why carbon solubility is more in an austenite?

2

4.

What is hardenability?

1

5.

What is “critical cooling rate” in hardening of steels?

4

6.

Name and explain any one subcritical case hardening treatment.

1

7.

What is meant by PSZ?

1

8.

What are sialons? State their applications

1

9.

What are bakelites? Also state their applications.

2

10. List the typical applications of PTFE?

PART – B 3

(10X2=20)

(5X13=65)

2

11.

2

b.Draw iron –carbon equilibrium diagram and label all the phases. Also enumerate the properties of the following phase. (i) Solid phase involved in Iron carbon diagram (6) (ii) Invariant reactions taking place in the iron carbon diagram .(7) 12. a.What are the micro-constituents of iron-carbide alloys? Explain the general characteristics of any four (8) (ii) Two metal A and B have melting points 800°C and 600°C respectively. (i)Draw a phase diagram between A and B if they exhibit unlimited solid solubility. (ii)Draw a phase diagram between A and B if a eutectic reactions occurs at composition 40%B and at temperature 400°C. Assume that the maximum solid solubility in either case is 5% and the room temperature solubility in either case is 1%. (5)

2 3 2

a.(i) How are solid solution classified? (3) (ii) Give two examples for each solid solution in detail ? (10)

2

3

b.(i) Define Annealing.(2) (ii) Explain the various type of annealing process in heat treatment process (11) a.(i)Describe the tempering process with its types (5)

2 2

13.

(ii) Determining Hardenability of Jominey End – Quench Test with neat sketch and explain the uses of hardenability curves.(8)

2

3

1 2

b. (i) Draw isothermal transformation & Time-Temperature-Transformation (T-T-T) diagram and label all the phases. Also enumerate any four objectives of heat treatment of steel.(8) (ii) Write short notes on nitriding surface hardening operations with neat sketch (5) 14.

a.(i) What is polymerization? (3) (ii) Describe in detail about the addition polymerization and condensation polymerization.(10) b.(i) How do thermoplastics differ from thermosetting materials?(5) (ii) Describe the molecular structures, properties and applications of the following thermoplastics polymer (8) 1.polystyrene 2. Polytetrafluoro 3. PMMA 4. Polycarbonate

15

a.Describe the molecular structures, properties and applications of thermosetting polymer (13) 1. Phenolics 2. EP 3. PUR

2

3

2 4 1

b.(i)What are the different types of engineering ceramics? (5) (ii)Give any four ceramics , their properties and applications (8)

2

PART – C 3

2

16

(1X15=15)

a(i) Name the different types of matrix and reinforcement materials used ?(5) (ii)Explain in different types of matrix materials and reinforcement materials used to make fibre –reinforcement composites (10)

2 2

b.(i) Explain the fibre-reinforced composites strength mechanism? (ii) List the advantages, limitations and applications of composite materials? a. Sialons b. PSZ c. Silicon carbide

CO1: Understanding the Alloys and Phase diagrams CO2 : Understanding the various heat treatment process CO4: Learning the various non metallic materials .

K1-REMEMBER, K2-UNDERSTAND, K3-APPLY, K4-ANALYSIS, K5-EVALUATE, K6-CREATE

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Subject In-charge

Verified By

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Approved by

DEAN/HOD