Production & Engineering Materials - 1

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Description

This mock test of Production & Engineering Materials - 1 for GATE helps you for every GATE entrance exam. This contains 10 Multiple Choice Questions for GATE Production & Engineering Materials - 1 (mcq) to study with solutions a complete question bank. The solved questions answers in this Production & Engineering Materials - 1 quiz give you a good mix of easy questions and tough questions. GATE students definitely take this Production & Engineering Materials - 1 exercise for a better result in the exam. You can find other Production & Engineering Materials - 1 extra questions, long questions & short questions for GATE on EduRev as well by searching above.

QUESTION: 1

Atomic p ack in g factor (APF) in the case of copper crystal is

A.
0.52
B.
0.68
C.
0.74
D.
1.633

Solution:

QUESTION: 2

T.T.T diagram indicates time and temperatures transformation of

A.
cementite
B.
pearlite
C.
ferrite
D.
austenite

Solution:

QUESTION: 3

The metal powder used in thermit welding of steel is

A.
A1
B.
Cu
C.
Pb
D.
W

Solution:

QUESTION: 4

Oxyacetylene reducing flame is used while carrying out the welding on

A.
grey cast iron
B.
high carbon steel
C.
mild steel
D.
alloy steels

Solution:

Oxyacetylene reducing flame is used while carrying out the welding on mild steel.

QUESTION: 5

The purpose of chaplets is

A.
just like chills to ensure directional solidification
B.
to provide efficient venting
C.
to support the cores
D.
to join lower and upper parts of the moulding box

Solution:

QUESTION: 6

Match List - I (Name of the Element) with List - II (Crystal Structure) and select the correct answer using the codes given below the lists:

L ist - I
P. Fluorspar
Q. Alpha-Iron
R. Silver
S. Zinc

List - II
1. Body-centered cubic
2. Hexagonal close packed
3. Simple cubic
4. Face-centered cubic

A.
A
B.
B
C.
C
D.
D

Solution:

QUESTION: 7

Welding of C40 steel plate of 10 mm thickness required a current of 150 amps, while it was 350 amps when the plate thickness was increased by 50%. Estimate the welding current for 8.25 mm thickness of same material.

A.
80 A
B.
90 A
C.
75 A
D.
95 A

Solution:

Given,
Current required for 10 mm thick plate =150 amps
Current required for 15mm thick plate = 350 amps

QUESTION: 8

In gas welding of mild steel using an oxy-acetylene consumed was 10 liters. The oxygen consumption from the cylinder is

A.
5 litres
B.
10 litres
C.
15 litres
D.
25 litres

Solution:

*Answer can only contain numeric values

QUESTION: 9

A spot welding obtained with a current of 40000 A for a period of 0.01 sec. If the effective resistance of the joint be taken as 120 micro ohms, and if the joint can be considered as a cylinder of 6mm diameter and 3 mm in height, the heat distributed to the surroundings is ________ J. (Take heat re q u ired for m eltin g steel as 10 J/mm³)

Solution:

Given,
Current (I) = 40000 A
Time (t₁) = 0.01s
Resistance (R) = 120μΩ = 120x 10^-6 Ω
Nugget formed is cylindrical with diameter (d_n) = 6mm
Height (h_n) = 3 mm
Total heat required for melting steel = 10 J/mm³

So heat required for melting steel = 10x34.82 = 848.2 J
So, heat lost surrounding per nugget = 1920 - 848.2 = 1071.8 J

QUESTION: 10

A slot 25 mm deep is to be cut through a workpiece 200 mm long with the help of HSS side and face cutter whose diameter is 150 mm and has 10 teeth. If cutting speed is 50 m/min and feed is 0.25 mm per teeth, then time (in sec) required to machine the slot is