Objective Questions and Answers on Design of Machine Elements - Set 19 - ObjectiveBooks

# Practice Test: Question Set - 19

1. The helix angle for double helical gears may be made up to
(A) 45°
(B) 60°
(C) 75°
(D) 90°

2. The bending moment ‘M’ and a torque ‘T’ is applied on a solid circular shaft. If the maximum bending stress equals to maximum shear stress developed, then ‘M’ is equal to
(A) T/2
(B) T
(C) 2 T
(D) 4 T

3. The distribution of the forces along the length of key fitted in a shaft
(A) Varies linearly
(B) Is uniform throughout
(C) Varies exponentially, being more near the torque-input end
(D) Varies exponentially, being less near the torque-input end

4. According to Indian standard specifications, 100 H6/g5 means that
(A) Tolerance grade for the hole is 6 and for the shaft is 5
(B) Tolerance grade for the shaft is 6 and for the hole is 5
(C) Tolerance grade for the shaft is 4 to 8 and for the hole is 3 to 7
(D) Tolerance grade for the hole is 4 to 8 and for the shaft is 3 to 7

5. In designing a flange coupling, the pitch circle diameter of bolts is taken as (where d = Diameter of the shaft)
(A) 2 d
(B) 3 d
(C) 4 d
(D) 5 d

6. A column of length l is fixed at both ends. The equivalent length of the column is
(A) l/2
(B) l/√2
(C) l
(D) 2 l

7. The notch sensitivity q is expressed in terms of fatigue stress concentration factor Kf and theoretical stress concentration factor Kt as
(A) (Kf + 1)/ (Kt + 1)
(B) (Kf - 1)/ (Kt - 1)
(C) (Kt + 1)/ (Kf + 1)
(D) (Kt - 1)/ (Kf - 1)

8. If the centre distance of the mating gears having involute teeth is varied within limits, the velocity ratio
(A) Increases
(B) Decreases
(C) Remains unchanged
(D) None of these

9. A type of brake commonly used in motor cars is a
(A) Shoe brake
(B) Band and block brake
(C) Band brake
(D) Internal expanding brake

10. Which of the following property is essential for spring materials?
(A) Stiffness
(B) Ductility
(C) Resilience
(D) Plasticity

11. The objective of caulking in a riveted joint is to make the joint
(A) Free from corrosion
(B) Stronger in tension
(C) Free from stress
(D) Leak-proof

12. The bending stress in a curved beam is
(A) Zero at the centroidal axis
(B) Zero at the point other than centroidal axis
(C) Maximum at the neutral axis
(D) None of these

13. Rankine Gordon formula for buckling is valid for
(A) Long column
(B) Short column
(C) Short and long column
(D) Very long column

14. In the levers of third type, the mechanical advantage is __________ one.
(A) Less than
(B) Equal to
(C) More than
(D) None of these

15. The maximum efficiency of a square threaded screw is
(A) (1 - sinφ)/ (1 + sinφ)
(B) (1 + sinφ)/ (1 - sinφ)
(C) (1 - sinφ)/ (1 + cosφ)
(D) (1 + cosφ)/ (1 - sinφ)

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