Machine Design Objective Questions with Answers - Set 04

Practice Test: Question Set - 04

1. The toughness of a material _________ when it is heated
    (A) Does not change
    (B) Increases
    (C) Decreases
    (D) None of the Above

2. The number of slots in a 25 mm castle nut is
    (A) 8
    (B) 6
    (C) 4
    (D) 2

3. When bevel gears connect two shafts whose axes intersect at an angle greater than a right angle and one of the bevel gears has a pitch angle of 90°, then they are known as
    (A) Angular bevel gears
    (B) Mitre gears
    (C) Internal bevel gears
    (D) Crown bevel gears

4. The rolling contact bearings are known as
    (A) Thick lubricated bearings
    (B) Plastic bearings
    (C) Antifriction bearings
    (D) Thin lubricated bearings

5. Cold working
    (A) Increases the fatigue strength
    (B) Decreases the fatigue strength
    (C) Has no influence on fatigue strength
    (D) Alone has no influence on fatigue strength

6. Yield point in fatigue loading as compared to static loading is
    (A) Same
    (B) Higher
    (C) Lower
    (D) Depends on other factors

7. The arms of the pulleys for flat belt drive have
    (A) Elliptical cross-section
    (B) Major axis in plane of rotation 
    (C) Major axis twice the minor axis
    (D) All the three characteristics

8. Residual stress in materials
    (A) Acts when external load is applied
    (B) Becomes zero when external load is removed
    (C) Is independent of external loads
    (D) Is always harmful

9. In a marine flange coupling, the thickness of flange is taken as
    (A) d/2
    (B) d/3
    (C) 3d/4
    (D) d/4

10. The building up of worn and undersized parts, subjected to repeated loads by electroplating is
    (A) Best method
    (B) Extremely hazardous
    (C) Has no effect as regards fatigue strength
    (D) Cheapest method

11. In nitrated parts, the origins of the fatigue cracks will occur at
    (A) Surface
    (B) Just below the surface
    (C) Within the core
    (D) None of the above

12. The objective of idler pulley in belt drive is to
    (A) Decrease the tendency of belt to slip 
    (B) Increase the power transmission capacity 
    (C) Increase the wrap angle and belt tension 
    (D) All the above objectives

13. The constant factor in case of R10 series of preferred numbers is
    (A) 1.06
    (B) 1.12
    (C) 1.26
    (D) 1.58

14. Which one of the following is a positive drive?
    (A) V-belt drive
    (B) Rope drive
    (C) Crossed flat belt drive
    (D) Chain drive

15. Which process will increase the fatigue duration of parts?
    (A) Finishing and polishing
    (B) Shot-peening
    (C) De-carburisation
    (D) Electroplating

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