Strength Of Materials Set 22

Mechanical Engineering

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This set of Strength of Materials Multiple Choice Questions & Answers (MCQs) focuses on Strength Of Materials Set 22

Q1 | Rivets are generally specified by
  • thickness of plates to be joined
  • overall length
  • shank diameter
  • diameter of head
Answer: shank diameter
Q2 | Two closely coiled helical springs 'A' and 'B' are equal in all respects but the diameter of wire of spring 'A' is double that of spring 'B'. The stiffness of spring 'B' will be
  • one-sixteenth
  • one-eighth
  • one-fourth
  • one-half
Answer: one-sixteenth
Q3 | The value of equivalent length is taken to be half of the actual length of a column with one end fixed and the other end free.
  • Agree
  • Disagree
Answer: Disagree
Q4 | Two closely coiled helical springs 'A' and 'B' are equal in all respects but the number of turns of spring 'A' is double that of spring 'B'. The stiffness of spring 'A' will be
  • one-sixteenth
  • one-eighth
  • one-fourth
  • one-half
Answer: one-half
Q5 | The neutral axis of a transverse section of a beam passes through the centre of gravity of the section and is
  • in the vertical plane
  • in the horizontal plane
  • in the same plane in which the beam bends
  • at right angle to the plane in which the beam bends
Answer: at right angle to the plane in which the beam bends
Q6 | For a 25 mm hole drilled in plates, the diameter of rivet shank should be
  • 23 mm
  • 24.5 mm
  • 25 mm
  • 26 mm
Answer: 23 mm
Q7 | The maximum bending moment for a simply supported beam with a gradually varying load from zero at both ends and w per metre at the centre, lies at the centre of a beam.
  • Agree
  • Disagree
Answer: Agree
Q8 | The moment of resistance of a balanced reinforced concrete beam is based on the stresses in
  • steel only
  • concrete only
  • steel and concrete both
  • none of these
Answer: steel and concrete both
Q9 | The shear stress at the centre of a circular shaft under torsion is
  • zero
  • minimum
  • maximum
  • infinity
Answer: zero
Q10 | Which of the following statement is correct?
  • The stress is the pressure per unit area.
  • The strain is expressed in mm.
  • Hook's law holds good upto the breaking point
  • Stress is directly proportional to strain within elastic limit.
Answer: Stress is directly proportional to strain within elastic limit.
Q11 | The thermal stress in a bar is
  • directly
  • indirectly
Answer: directly
Q12 | The Poisson's ratio for steel varies from
  • 0.23 to 0.27
  • 0.25 to 0.33
  • 0.31 to 0.34
  • 0.32 to 0.42
Answer: 0.23 to 0.27
Q13 | A steel bar of 5 mm is heated from 15?C to 40?C and it is free to expand. The bar will induce
  • no stress
  • shear stress
  • tensile stress
  • compressive stress
Answer: no stress
Q14 | The tensile strength of ductile materials is
  • equal to
  • less than
  • greater than
Answer: greater than
Q15 | Which of the following statement is correct?
  • The energy stored in a body, when strained within elastic limit is known as strain energy.
  • The maximum strain energy which can be stored in a body is termed as proof resilience.
  • The proof resilience per unit volume of a material is known as modulus of resilience.
  • all of the above
Answer: all of the above
Q16 | When a load on the free end of a cantilever beam is increased, failure will occur
  • at the free end
  • at the fixed end
  • in the middle of the beam
  • at a distance 21 / 3 from free end
Answer: at the fixed end
Q17 | The torsional regidity of a shaft is expressed by the torque required to produce a twist of one radian per unit length of a shaft.
  • True
  • False
Answer: True
Q18 | In a beam subjected to pure bending, the intensity of stress in any fibre is
  • equal to
  • less than
  • more than
  • directly proportional to
Answer: directly proportional to
Q19 | The assumption made in Euler's column theory is that
  • the failure of column occurs due to buckling alone
  • the length of column is very large as compared to its cross-sectional dimensions
  • the column material obeys Hooke's law
  • all of the above
Answer: all of the above
Q20 | Strain rosetters are used tc
  • measure shear strain
  • measure linear strain
  • measure volumetric strain
  • relieve strain
Answer: measure linear strain
Q21 | The bending moment at the centre of a simply supported beam with a gradually varying load from zero at both ends to w per metre at the centre is wl / 4.
  • Yes
  • No
Answer: No
Q22 | In a simple bending theory, one of the assumption is that the plane sections before bending remain plane after bending. This assumption means that.
  • stress is uniform throughout the beam
  • strain is uniform throughout the beam
  • stress is proportional to the distance from the neutral axis
  • strain is proportional to the distance from the neutral axis
Answer: strain is proportional to the distance from the neutral axis
Q23 | Poisson's ratio is the ratio of linear strain to the volumetric strain.
  • True
  • False
Answer: False
Q24 | The assumption, generally, made in the theory of simple bending is that
  • the beam material is perfectly homogenous and isotropic
  • the beam material is stressed within its elastic limit
  • the plane sections before bending remain plane after bending
  • all of the above
Answer: all of the above
Q25 | A closely coiled helical spring is of mean diameter (D) and spring wire diameter (d). The spring index is the ratio of
  • 1 / d
  • 1 / D
  • D / d
  • d / D
Answer: D / d
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