Mechanical Design Questions and Answers - Set 39 - ObjectiveBooks

Mechanical Design Questions and Answers - Set 39

Practice Test: Question Set - 39

1. In a steam engine, the valve rod is connected to an eccentric rod by means of
    (A) Cotter joint
    (B) Knuckle joint
    (C) Universal joint
    (D) Flange coupling

2. Guest's theory is used for
    (A) Brittle materials
    (B) Ductile materials
    (C) Elastic materials
    (D) Plastic materials

3. Which of the following property is desirable in parts subjected to shock and impact loads?
    (A) Strength
    (B) Stiffness
    (C) Brittleness
    (D) Toughness

4. The steel widely used for motor car crankshafts is
    (A) Nickel steel
    (B) Chrome steel
    (C) Nickel Chrome steel
    (D) High speed steel

5. According to I.B.R., the thickness of the boiler shell should not be less than
    (A) 4 mm
    (B) 5 mm
    (C) 6 mm
    (D) 7 mm

6. Gears are casted by
    (A) Sand mould casting
    (B) Slush casting
    (C) Permanent mould casting
    (D) Centrifugal casting

7. A tapered key which fits in a key way in the hub and is flat on the shaft, is known as
    (A) Feather key
    (B) Gib-head key
    (C) Wood ruff key
    (D) Flat saddle key

8. When a bolt is subjected to an external load, the stress induced in the bolt will be
    (A) Tensile stress
    (B) Shear stress
    (C) Combined tensile and shear stress
    (D) Any one of these

9. The rocker arms in internal combustion engines are of__________.
    (A) First type levers
    (B) Second type levers
    (C) Third type levers
    (D) None of these

10. Which one of the following loading is considered for the design of axles?
    (A) Bending moment only
    (B) Twisting moment only
    (C) Combined bending moment and twisting moments
    (D) Combined action of bending moment, twisting moment and axial thrust

11. When a metal or alloy is cold worked,
    (A) Its hardness and strength increases
    (B) It is worked below recrystallization temperature
    (C) Both (A) and (B)
    (D) None of these

12. In designing a sleeve coupling, outer diameter of the sleeve is taken as (where d Diameter of the shaft)
    (A) d + 17 mm
    (B) 2d + 13 mm
    (C) 2d + 20 mm
    (D) 3.5d

13. When the shaft rotates in anticlockwise direction at high speed in a bearing, it will
    (A) Have contact at the bottom most of the bearing
    (B) Move towards right of the bearing making metal to metal contact
    (C) Move towards right of the bearing making no metal to metal contact
    (D) Move towards left of the bearing making metal to metal contact

14. A cotter joint is used to connect two __________ rods.
    (A) Co-axial
    (B) Perpendicular
    (C) Parallel
    (D) None of these

15. The difference between the upper limit and lower limit of a dimension is called
    (A) Nominal size
    (B) Basic size
    (C) Actual size
    (D) Tolerance

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