Mechanical Engineering - Machine Design - Machine Design

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Question - 1

The stress which vary from a minimum value to a maximum value of the same nature (i.e., tensile or compressive) is called

  • A repeated stress
  • B yield stress
  • C alternating stress
  • D fluctuating stress

Question - 2

In static loading, stress concentration is more serious in

  • A brittle materials
  • B ductile materials
  • C Both (a) and (b)
  • D None of these

Question - 3

In cyclic loading, stress concentration is more serious in

  • A brittle materials
  • B ductile materials
  • C Both (a) and (b)
  • D None of these

Question - 4

Failure of a material is called fatigue when it fails

  • A at the elastic limit
  • B below the elastic limit
  • C above the yield point
  • D below the yield point

Question - 5

The notch sensitivity q is expressed in terms of fatigue stress concentration factor kf and theoretical stress concentration factor kt as

  • A \(\frac { { k }_{ f }+1 }{ { k }_{ t }+1 } \)
  • B \(\frac { { k }_{ f }-1 }{ { k }_{ t }-1 } \)
  • C \(\frac { { k }_{ t }-1 }{ { k }_{ f }-1 } \)
  • D \(\frac { { k }_{ f }-1 }{ { k }_{ t }+1 } \)

Question - 6

A loaded semi-infinite flat plate is having an elliptical hole (A/B = 2) in the middle as show in the figure. The stress concentration factor at points either X or Y is

  • A 1
  • B 5
  • C 3
  • D 7

Question - 7

What is the value of stress at point A?

  • A 8 N/m2 (compressive)
  • B 4 N/m2 (tensile)
  • C 4 N/m2 (compressive)
  • D 8 N/m2 (tensile)

Question - 8

In below figure a bi-axial stress acting on the block. The maximum yield stress of the material is 40 N/m2. The value of factor of safety is (according to maximum distortion energy theorem)

  • A 1.88
  • B 1.72
  • C 1.80
  • D 1.81

Question - 9

What is the value of hoop stress in cylinder at point A, if thickness of cylinder is 20 cm?

  • A 2 MPa
  • B 3.15 MPa
  • C 4 MPa
  • D 2.5 MPa

Question - 10

If \(\frac{a}{b}\)=2 then, stress concentration due to hole is

  • A 5
  • B 3
  • C 2
  • D 4