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Production & Engineering Materials - 1


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10 Questions MCQ Test GATE Mechanical (ME) 2023 Mock Test Series | Production & Engineering Materials - 1

Production & Engineering Materials - 1 for Mechanical Engineering 2023 is part of GATE Mechanical (ME) 2023 Mock Test Series preparation. The Production & Engineering Materials - 1 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Production & Engineering Materials - 1 MCQs are made for Mechanical Engineering 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Production & Engineering Materials - 1 below.
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Production & Engineering Materials - 1 - Question 1

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

Production & Engineering Materials - 1 - Question 2

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

Production & Engineering Materials - 1 - Question 3

The metal powder used in thermit welding of steel is

Production & Engineering Materials - 1 - Question 4

Oxyacetylene reducing flame is used while carrying out the welding on

Detailed Solution for Production & Engineering Materials - 1 - Question 4

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

Production & Engineering Materials - 1 - Question 5

The purpose of chaplets is

Production & Engineering Materials - 1 - 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

Production & Engineering Materials - 1 - 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.

Detailed Solution for Production & Engineering Materials - 1 - Question 7

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





Production & Engineering Materials - 1 - Question 8

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

Detailed Solution for Production & Engineering Materials - 1 - Question 8

*Answer can only contain numeric values
Production & Engineering Materials - 1 - 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


Detailed Solution for Production & Engineering Materials - 1 - Question 9

Given,
Current (I) = 40000 A
Time (t1) = 0.01s
Resistance (R) = 120μΩ = 120x 10-6 Ω
Nugget formed is cylindrical with diameter (dn) = 6mm
Height (hn) = 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

Production & Engineering Materials - 1 - 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

Detailed Solution for Production & Engineering Materials - 1 - Question 10




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