Machine Design Multiple Choice Questions - Set 30

Practice Test: Question Set - 30


1. The ratio of the ultimate stress to the design stress is known as
    (A) Elastic limit
    (B) Strain
    (C) Factor of safety
    (D) Bulk modulus

2. A shaft is subjected to fluctuating loads for which the normal torque (T) and bending moment (M) are 1000 N-m and 500 N-m respectively. If the combined shock and fatigue factor for bending is 1.5 and combined shock and fatigue factor for torsion is 2, then the equivalent twisting moment for the shaft is
    (A) 2000 N-m
    (B) 2050 N-m
    (C) 2100 N-m
    (D) 2136 N-m

3. Which of the following formula is used in designing a connecting rod?
    (A) Euler's formula
    (B) Rankine's formula
    (C) Johnson's straight line formula
    (D) Johnson's parabolic formula

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

5. The plasticity is the property of a material which enables it to
    (A) Regain its original shape after deformation when the external forces are removed
    (B) Draw into wires by the application of a tensile force
    (C) Resist fracture due to high impact loads
    (D) Retain deformation produced under load permanently

6. In a journal bearing, the load on the bearing is __________ to the axis of the journal.
    (A) Parallel
    (B) Perpendicular
    (C) Both A and B
    (D) None of these

7. Which of the following cotter joint will be used to connect strap end of a connecting rod?
    (A) Spigot and socket cotter joint
    (B) Sleeve and cotter joint
    (C) Gib and cotter joint
    (D) Any one of these

8. The fatigue stress concentration factor is defined as
    (A) The ratio of endurance limit with stress concentration to the endurance limit without stress concentration
    (B) The ratio of endurance limit without stress concentration to the endurance limit with stress concentration
    (C) The product of the endurance limits with and without stress concentration
    (D) All of the above

9. A flange coupling is used to connect two shafts
    (A) Which are perfectly aligned
    (B) Which are not in exact alignment
    (C) Have lateral misalignment
    (D) Whose axes intersect at a small angle

10. In a full journal bearing, the angle of contact of the bearing with the journal is
    (A) 120°
    (B) 180°
    (C) 270°
    (D) 360°

11. The coefficient of friction between the belt and pulley depends upon the
    (A) Material of belt and pulley
    (B) Slip of belt
    (C) Speed of belt
    (D) All of these

12. The steel pulleys are __________ in weight than cast iron pulleys of the same capacity.
    (A) Heavier
    (B) Lighter
    (C) Moderate
    (D) None of these

13. The centre to centre distance between two consecutive rivets in a row, is called
    (A) Margin
    (B) Pitch
    (C) Back pitch
    (D) Diagonal pitch

14. If the size of a standard specimen for a fatigue testing machine is increased, the endurance limit for the material will
    (A) Have same value as that of standard specimen
    (B) Increase
    (C) Decrease
    (D) None of these

15. A crankshaft is a __________ shaft.
    (A) Transmission
    (B) Machine
    (C) Machine frame
    (D) None of these

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