QUESTIONS BANK 7 : FORCE AND FORCE SYSTEM

QUESTIONS BANK 6 : FORCE AND FORCE SYSTEM

(I am going to publish a question bank for EME-102/EME-202 of 1st yr. MTU; Greater Noida. Some pages from the book .......Subhankar Karmakar)

QUESTIONS BANK 5 : FORCE AND FORCE SYSTEM

(I am going to publish a question bank for EME-102/EME-202 of 1st yr. MTU; Greater Noida. Some pages from the book .......Subhankar Karmakar)

 

QUESTIONS BANK 4 : FORCE AND FORCE SYSTEM

(I am going to publish a question bank for EME-102/EME-202 of 1st yr. MTU; Greater Noida. Some pages from the book .......Subhankar Karmakar)

QUESTIONS BANK 3 : FORCE AND FORCE SYSTEM

(I am going to publish a question bank for EME-102/EME-202 of 1st yr. MTU; Greater Noida. Some pages from the book .......Subhankar Karmakar)

 

NEW SYLLABUS FOR MANUFACTURING SCIENCE: FIRST YEAR OF MTU FOR 2012-13

MANUFACTURING SCIENCE (EME-101/EME-201)

Unit-I 
Properties, Inspection and Testing of materials
Introduction to stress & strain
Mechanical Properties: Strength, Elasticity, Stiffness, Malleability, Ductility, Brittleness, Resilience, Toughness and Hardness.
Elementary ideas of Creep, Fatigue & Fracture
Testing of metals: Destructive testing, tensile testing, Compression test, Hardness tests, Impact test.

Unit-II
Basic Metals & Alloys: Properties and Applications
Ferrous Materials: Carbon steels, its classification based on % carbon as low, mild, medium & high carbon steel, its properties & applications.
Wrought iron, Cast iron, Alloy steels: stainless steel, tool steel.
Elementary introduction to Heat- treatment of carbon steels: Annealing, Normalizing, Quenching Tempering & case-hardening.
Non-Ferrous metals & alloys: Common uses of various non-ferrous metals & alloys and its composition such as Cu-alloys: Brass, Bronze, Al-alloys such as Duralumin.

Unit III 
Introduction to Metal Forming & Casting Process and its applications
Metal Forming: Basic metal forming operations & uses of such as: Forging, Rolling, Wire & Tube-drawing/making and Extrusion, and its products/applications, Press-work, die & punch assembly, cutting and forming, its applications, Hot-working versus cold-working.
Casting: Pattern & allowances, Moulding sands and its desirable properties, Mould making with the use of a core, Gating system, Casting defects & remedies, Cupola Furnace, Die-casting and its uses.

Unit-IV 
Introduction to Machining & Welding and its applications
Machining: Basic principles of Lathe-machine and operations performed on it, Basic description of machines and operations of Shaper, Planer, Drilling, and Milling & Grinding.
Welding: Importance & basic concepts of welding, Classification of welding processes. Gas-welding, types of flames, Electric-Arc welding, Resistance welding, Soldering & Brazing and its uses.

Unit-V 
Miscellaneous Topics
Manufacturing: Importance of Materials & Manufacturing towards Technological & Socio- Economic developments, Plant location, Plant layout – its types, Types of Production, Production versus productivity.  Miscellaneous Processes: Powder-metallurgy process & its applications, Plastic-products manufacturing, Galvanizing and Electroplating.

QUESTIONS BANK 2: FORCE AND FORCE SYSTEM

(I am going to publish a question bank for EME-102/EME-202 of 1st yr. MTU; Greater Noida. Some pages from the book .......Subhankar Karmakar)

1)      Explain the principle of Super-position.

Ans: The principle of superposition states that “The effect of a force on a body does not change and remains same if we add or subtract any system which is in equilibrium.”

In the fig 4 a, a force P is applied at point A in a beam, where as in the fig 4 b, force P is applied at point A and a force system in equilibrium which is added at point B. Principle of super position says that both will produce the same effect.

2)      What is “Force-Couple system?”

Ans: When a force is required to transfer from a point A to point B, we can transfer the force directly without changing its magnitude and direction but along with the moment of force about point B.

As a result of parallel transfer a system is obtained which is always a combination of a force and a moment or couple. This system consists of a force and a couple at a point is known as Force-Couple system.

      In fig 5 a, a force P acts on a bar at point A, now at point B we introduce a system of forces  in equilibrium (fig 5 b), hence according to principle of superposition there is no change in effect of the original system. Now we can reduce the downward force P at point A and upward force P at point B as a couple of magnitude Pxd at point B (fig 5 c).

3) What do you understand by Equivalent force systems?

Ans: Two different force systems will be equivalent if they can be reduced to the same force-couple system at a given point. So, we can say that two force systems acting on the same rigid body will be equivalent if the sums of forces or resultant and sums of the moments about a point are equal.

4)      What is orthogonal or perpendicular resolution of a force?

Ans: The resolution of a force into two components which are mutually perpendicular to each other along X-axis and Y-axis is called orthogonal resolution of a force.

If a force F acts on an object at an angle θ with the positive X-axis, then its component along X-axis is F_x = Fcosθ, and that along Y-axis is F_y = Fsinθ

5) What is oblique or non-perpendicular resolution of a force?

Ans: When a force is required to be resolved in to two directions which are not perpendiculars to each other the resolution is called oblique or Non-perpendicular resolution of a force.

   
       F_OA = (P sin β)/ sin (α +β)

 F_OB = (P sin α)/ sin (α +β)