Machine Design Objective Quiz Questions and Answers - Set 37 - ObjectiveBooks

# Practice Test: Question Set - 37

(A) Equal to
(B) Less than
(C) Greater than
(D) None of these

2. The power transmitted by means of a belt depends upon
(A) Velocity of the belt
(B) Tension under which the belt is placed on the pulleys
(C) Arc of contact between the belt and the smaller pulley
(D) All of the above

3. According to Indian standard specifications, plain carbon steel designated by 40C8 contains carbon
(A) 0.20 to 0.40%
(B) 0.35 to 0.45%
(C) 0.40 to 0.60%
(D) None of these

4. The longitudinal joint in boilers is used to get the required
(A) Length of boiler
(B) Diameter of boiler
(C) Length and diameter of boiler
(D) Efficiency of boiler

5. A riveted joint is a __________ fastening.
(A) Permanent
(B) Temporary
(C) Either A or B
(D) None of these

6. A long helical spring having a spring stiffness of 12 kN/m and number of turns 20, breaks into two parts with number of turns 10 each in both the parts. If the two parts are connected in series, then the softness of the resultant spring will be
(A) 6 kN/m
(B) 12 kN/m
(C) 24 kN/m
(D) 30 kN/m

7. A locking device extensively used in automobile industry is a
(A) Jam nut
(B) Castle nut
(C) Sawn nut
(D) Ring nut

8. Failure of a material is called fatigue when it fails
(A) At the elastic limit
(B) Below the elastic limit
(C) At the yield point
(D) Below the yield point

9. The endurance limit for a mirror polished material will be __________ as compared to unpolished material.
(A) Same
(B) Less
(C) More
(D) None of these

10. The V-belts are particularly suitable for __________ drives.
(A) Short
(B) Long
(C) Both A and B
(D) None of these

11. A pressure vessel is said to be a thick shell, if the ratio of wall thickness to its diameter is
(A) Equal to 1/10
(B) Less than 1/10
(C) Greater than 1/10
(D) None of these

12. The lead angle of a worm is 22.5°. Its helix angle will be
(A) 22.5°
(B) 45°
(C) 67.5°
(D) 90°

13. The ends of the leaves of a semi-elliptical leaf spring are made triangular in order to
(A) Obtain variable moment of inertia (I) in each leaf
(B) Permit each leaf to act as an overhanging beam
(C) Have variable bending moment (M) in each leaf
(D) Make M/I constant throughout the length of the leaf

14. When a load W is applied suddenly on a bar of cross-sectional area A, the stress induced in the bar will be
(A) W/A
(B) W/2A
(C) 2W/A
(D) 3W/A

15. When the material of key and shaft is same, and the width of key is one-fourth of the diameter of shaft (d), then length of key will be
(A) 0.8 d
(B) 1.2 d
(C) 1.57 d
(D) 1.8 d

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