Machine Design Questions and Answers Objective Type

Practice Test: Question Set - 41

1. The bearing characteristic number in a hydrodynamic bearing depends upon
    (A) Length, width and load
    (B) Length, width and speed
    (C) Viscosity, speed and load
    (D) Viscosity, speed and bearing pressure

2. Which of the following welded joint is designed for shear strength?
    (A) Transverse fillet welded joint
    (B) Parallel fillet welded joint
    (C) Butt welded joint
    (D) All of these

3. The surface finish factor for a mirror polished material is
    (A) 0.45
    (B) 0.65
    (C) 0.85
    (D) 1

4. According to maximum normal stress theory, the maximum normal stress in the shaft is
    (A) (1/2) ×(σ² × 4τ²)
    (B) (σ² × 4τ²)
    (C) (1/2) × [σ +(σ² × 4τ²)]
    (D) σ +(σ² × 4τ²)

5. The dynamic tooth load is due to
    (A) Inaccuracies of tooth spacing
    (B) Irregularities in tooth profiles
    (C) Deflections of teeth under load
    (D) All of these

6. In helical bevel gearing, the axes of shafts are __________ and the teeth are curved.
    (A) Intersecting
    (B) Non-intersecting and non-parallel
    (C) Intersecting and non-parallel
    (D) None of these

7. In a flange coupling, the keys are staggered at __________ along the circumference of the shafts in order to divide the weakening effect caused by key ways.
    (A) 90°
    (B) 135°
    (C) 160°
    (D) 180°

8. In the levers of __________ type, the mechanical advantage is less than one.
    (A) First
    (B) Second
    (C) Third
    (D) None of these

9. The strength of the unriveted plate (P) per pitch length is equal to
    (A) p.d.σt
    (B) p.t.σt
    (C) (p - d) σt
    (D) (p - d) t.σt

10. A shaft coupling should
    (A) Be easy to connect or disconnect
    (B) Transmit full power of the shaft
    (C) Hold the shafts in perfect alignment
    (D) All of these

11. The function of the washer is to
    (A) Fill up the axial gap
    (B) Provide bearing area
    (C) Provide cushioning effect
    (D) Absorb shocks and vibrations

12. Shaft coupling is used in machinery to
    (A) Introduce mechanical flexibility
    (B) Introduce protection against over loads
    (C) Reduce the transmission of shock loads
    (D) All of these

13. A saddle key __________ power through frictional resistance only.
    (A) Transmits
    (B) Does not transmit
    (C) Either A or B
    (D) None of these

14. The cam follower generally used in automobile engines is
    (A) Knife edge follower
    (B) Flat faced follower
    (C) Spherical faced follower
    (D) Roller follower

15. The shear modulus of resilience is proportional to
    (A) Shear stress
    (B) (Shear stress)²
    (C) (Shear stress)3
    (D) (Shear stress)⁴

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