Design Against Fluctuating Load MCQ Practice Test - Set 01 - ObjectiveBooks

# Practice Test: Question Set - 01

1. The notch sensitivity factor (q) is given by

Where, Kt and Kf are theoretical and fatigue stress concentration factors

(A) q = Kf - 1/Kt -1
(B) q = Kt -1/Kf - 1
(C) q = Kf + 1/Kt +1
(D) q = Kt +1/Kf + 1

2. In static loading, the effect of stress concentration is more serious in case of
(A) Components made of brittle materials
(B) Components made of ductile materials
(C) Components made of brittle as well as ductile materials
(D) None of the above

3. A stress that varies in sinusoidal manner with respect to time from tensile to compressive (or vice versa) and which zero mean is called
(A) Reversed stress
(B) Fluctuating stress
(C) Repeated stress
(D) Varying stress

4. The approximate relationship between endurance limit of rotating beam specimen (S’e) and ultimate tensile strength (Sut) in case of cast iron and cast steel components, is
(A) S’e = 0.4 Sut
(B) S’e = 0.75 Sut
(C) S’e = 0.577 Sut
(D) S’e = 0.5 Sut

5. The reliability factor for using 50% reliability in design is
(A) 0.897
(B) 1
(C) 0.868
(D) 0.814

6. Stress concentration factor is defined as
(A) Ratio of highest stress near the discontinuity to endurance limit
(B) Ratio of highest stress near the discontinuity to yield strength
(C) Ratio of highest stress near the discontinuity to nominal stress obtained by elementary equation
(D) Ratio of endurance limit to highest stress near the

7. Stress concentration occurs at the contact between
(A) Meshing teeth of driving and driven gears
(B) Cam and follower
(C) Balls and races in ball bearing
(D) Any one of the above

8. Fatigue failure results due to fluctuating stresses when the stress magnitude is
(A) More than ultimate tensile strength
(B) More than yield strength but lower than ultimate tensile strength
(C) Lower than yield strength
(D) None of the above

9. As the size of the component increases, the endurance limit of the component
(A) Increases
(B) Decreases
(C) Remains same
(D) Increases up to the diameter of 50 mm and then decreases

10. Cold working
(A) Increases fatigue strength
(B) Decreases fatigue strength
(C) Has no influence on fatigue strength
(D) None of the above

11. The criterion of failure for machine parts subjected to fluctuating stresses is
(A) Ultimate tensile strength
(B) Yield strength
(C) Endurance limit
(D) Modulus of elasticity

Show and hide multiple DIV using JavaScript View All Answers

Next Tests:
Blogger Comment