1 Crore+ students have signed up on EduRev. Have you? |
Atomic p ack in g factor (APF) in the case of copper crystal is
T.T.T diagram indicates time and temperatures transformation of
The metal powder used in thermit welding of steel is
Oxyacetylene reducing flame is used while carrying out the welding on
Oxyacetylene reducing flame is used while carrying out the welding on mild steel.
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
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.
Given,
Current required for 10 mm thick plate =150 amps
Current required for 15mm thick plate = 350 amps
In gas welding of mild steel using an oxy-acetylene consumed was 10 liters. The oxygen consumption from the cylinder is
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)
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
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
26 docs|239 tests
|
Use Code STAYHOME200 and get INR 200 additional OFF
|
Use Coupon Code |
26 docs|239 tests
|
|
|
|
|
|
|
|