Mechanical Engineering Machine Design - Set 10

Practice Test: Question Set - 10


1. The edges of the plates for cylindrical vessels are usually bevelled to an angle of 80° for
    (A) Reducing stress concentration
    (B) Ease of manufacture
    (C) Safety
    (D) Fullering and caulking

2. The piston rod of a steam engine is usually connected to the cross-head by means of
    (A) Bolted joint
    (B) Knuckle joint
    (C) Cotter joint
    (D) Universal joint

3. The ratio of endurance limit in shear to the endurance limit in flexure is
    (A) 0.70
    (B) 0.25
    (C) 0.40
    (D) 0.55

4. Which of the following pipe joints would be suitable for pipes carrying steam?
    (A) Flanged
    (B) Threaded
    (C) Bell and spigot
    (D) Expansion

5. When the belt speed increases
    (A) Power transmitted increases 
    (B) Power transmitted decreases 
    (C) Power transmitted increases to a maximum value and then decreases 
    (D) Power transmitted remains the same 

6. Spring index is
    (A) Ratio of coil diameter to wire diameter
    (B) Load required to produce unit deflection
    (C) Its capability of storing energy
    (D) Indication of quality of spring

7. If a bearing is designated by the number 305, it means that the bearing is of
    (A) Medium series whose bore is 5 mm
    (B) Medium series whose bore is 25 mm
    (C) Light series whose bore is 25 mm
    (D) Light series whose bore is 5 mm

8. The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is
    (A) Larger
    (B) Smaller
    (C) Equal
    (D) Larger/smaller depending on diameter of spring coil

9. The metal suitable for bearings subjected to heavy loads is
    (A) White metal
    (B) Silicon bronze
    (C) Monel metal
    (D) Phosphor bronze

10. Form coefficient of spring is
    (A) Ratio of coil diameter to wire diameter
    (B) Load required to produce unit deflection
    (C) Its capability of storing energy
    (D) Concerned with strength of wire of spring

11. Spring stiffness is
    (A) Ratio of coil diameter to wire diameter
    (B) Load required to produce unit deflection
    (C) Its capability of storing energy
    (D) Its ability to absorb shocks

12. The creep in the belt is due to
    (A) Effect of temperature on belt 
    (B) Material of belt 
    (C) Unequal extensions in the belt due to tight and slack side tensions 
    (D) Stresses beyond elastic limit of belt material 

13. When two springs are in series (having stiffness K), the equivalent stiffness will be
    (A) K
    (B) K/2
    (C) 2K
    (D) K/4

14. When a close coiled helical spring is compressed, its wire is subjected to
    (A) Tension
    (B) Shear
    (C) Compression
    (D) All of the above

15. A bolt of uniform strength can be developed by
    (A) Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt
    (B) Keeping the core diameter smaller than the diameter of the unthreaded portion
    (C) Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt
    (D) None of the above

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