Theory Practice on Machine Design Engineering - Set 28

Practice Test: Question Set - 28


1. Deep groove ball bearings are used for
    (A) Heavy thrust load only
    (B) Small angular displacement of shafts
    (C) Radial load at high speed
    (D) Combined thrust and radial loads at high speed

2. Which of the following screw thread is adopted for power transmission in either direction?
    (A) Acme threads
    (B) Square threads
    (C) Buttress threads
    (D) Multiple threads

3. The contact ratio for gears is
    (A) Zero
    (B) Less than one
    (C) Greater than one
    (D) None of these

4. The gears are termed as medium velocity gears, if their peripheral velocity is
    (A) 1-3 m/s
    (B) 3-15 m/s
    (C) 15-30 m/s
    (D) 30-50 m/s

5. The design calculations for members subject to fluctuating loads with the same factor of safety, yield the most conservative estimates when using
    (A) Gerber relation
    (B) Soderberg relation
    (C) Goodman relation
    (D) None of these

6. In a multiple V-belt drive, if one of the belts break, then
    (A) Only the broken belt is replaced
    (B) The entire set of belts is replaced
    (C) The broken belt and the belt on either side of it, is replaced
    (D) The broken belt need not to be replaced

7. A steel containing up to 0.15% carbon is known as
    (A) Mild steel
    (B) Dead mild steel
    (C) Medium carbon steel
    (D) High carbon steel

8. When a helical compression spring is cut into halves, the stiffness of the resulting spring will be
    (A) Same
    (B) Double
    (C) One-half
    (D) One-fourth

9. A coupling used to connect two perfectly aligned shafts, is
    (A) Muff coupling
    (B) Compression coupling
    (C) Flange coupling
    (D) All of these

10. Soderberg relation is based on __________ of the material whereas all other failure relation for dynamic loading are based on ultimate strength of the material.
    (A) Elastic strength
    (B) Yield strength
    (C) Shear strength
    (D) None of these

11. A connecting rod is designed as a
    (A) Long column
    (B) Short column
    (C) Strut
    (D) All of these

12. When bevel gears having equal teeth and equal pitch angles connect two shafts whose axes intersect at right angle, then they are known as
    (A) Angular bevel gears
    (B) Crown bevel gears
    (C) Internal bevel gears
    (D) Miter gears

13. When the connected members are very yielding (soft gasket) as compared to the bolt, then the resultant load on the bolt will be equal to the
    (A) Initial tension
    (B) External load applied
    (C) Sum of the initial tension and external load applied
    (D) Initial tension or external load, whichever is greater

14. The property of a bearing material which has the ability to accommodate shaft deflections and bearing inaccuracies by plastic deformation without excessive wear and heating, is known as
    (A) Bondability
    (B) Embeddability
    (C) Comformability
    (D) Fatigue strength

15. The shock resistance of steel is increased by adding
    (A) Nickel
    (B) Chromium
    (C) Nickel and chromium
    (D) Cobalt and molybdenum

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