Elements of Mechanical Engineering Mid - I, September - 2014

1.The ratio of linear stress to linear strain is called
  • Bulk Modules
  • Shear modulus
  • Young’s Modulus
  • Poisson’s ratio
Answer: C
2.Hook’s Law holds good up to
  • Elastic limit
  • Yield Point
  • Plastic Limit
  • All of the above
Answer: B
3.The Bulk modulus of body subjected to three mutually perpendicular stress Of equal intensity is the ratio of________
  • Direct stress to Volumetric strain
  • Volumetric strain to Direct stress
  • Shear stress to shear strain
  • Tensile stress to Tensile Strain
Answer: A
4.The relation between Modulus of Elasticity (E), Modulus of Rigidity(C) and Bulk Modulus (K) is given by
Answer: B
5.The value of Poisson’s Ratio for steel varies from
  • 0.20 to 0.25
  • 0.25 to 0.35
  • 0.35 to 0.40
  • 0.40 to 0.55
Answer: B
6.A beam which is fixed at one end and free at the other end is called
  • Simply supported beam
  • Fixed beam
  • Over hanging beam
  • Cantilever beam
Answer: D
7.When shear force at a point is Zero, then bending moment at that point Will be
  • Zero
  • Minimum
  • Maximum
  • Infinity
Answer: C
8.The bending moment diagram for a simply supported beam loaded in its Center is
  • right angled triangle
  • an isosceles triangle
  • An equilateral triangle
  • a rectangle
Answer: B
9.In the theory of Simple of bending, the bending stress in the beam section Varies
  • Linearly
  • Parabolically
  • Elliptically
  • None of the above
Answer: A
10.The Section Modulus of a Circular section of diameter (d) is _____
Answer: B
11.When the material loaded within elastic limit, then the stress is _______ proportional to strain.
Answer: Directly
12.The Ratio of Change in volume to Original volume is known as ________________.
Answer: Volumetric Strain
13.When a bar is subjected to a change of temperature and its deformation is prevented, The stress induced in the bar is___________ stress.
Answer: Thermal
14.When two parts are joined by bolt and one part is tightened on the other, stress set up in the bolt is__________.
Answer: Tensile stress
15.A Composite section, contain 4 different materials. The stresses in all the different Material will be ____________.
Answer: Different
16.The shear force at a point on a beam is the algebraic _______ of the forces on either side of the point.
Answer: Sum
17.The point of Contra flexure is a point where ____________ changes sign.
Answer: Bending Moment
18.The Neutral axis of a section is an axis, at which the bending stress is ________ .
Answer: Zero
19.The Section Modulus of a Rectangular section having width (b) and depth (d) is ______________.
Answer: bd2/6
20.A Thin cylindrical shell of diameter (d) ,length (l ) is subjected to an internal pressure (p) Circumferential stress in the shell is __________ .
Answer: pd/2t