Machine Design Objective Questions with Answers - Set 02

Practice Test: Question Set - 02


1. The sleeve or muff coupling is designed as a
    (A) Dun cylinder
    (B) Hollow shaft
    (C) Solid shaft
    (D) Thick cylinder

2. In a flange coupling, the flanges are coupled together by means of
    (A) Bolts and nuts
    (B) Studs
    (C) Headless taper bolts
    (D) None of these

3. If a load W is applied instantaneously on a bar; Then the stress induced in bar will
    (A) Be independent of ratio of mass of load W to mass of bar (y)
    (B) Increase with increase in y
    (C) Decrease with decrease in y
    (D) Depend on other considerations

4. According to Indian standard specifications, 100 H6/g5 means that the
    (A) Basic size is 100 mm
    (B) Actual size is 100 mm
    (C) Difference between the actual size and basic size is 100 mm
    (D) None of the above

5. The power transmitted by the belt drive can be increased by
    (A) Increasing the initial tension in the belt 
    (B) Dressing the belt to increase the coefficient of friction 
    (C) Increasing wrap angle by using idler pulley 
    (D) All of the above methods

6. Surface endurance limit of gear material is dependent upon its
    (A) Elastic strength
    (B) Yield strength
    (C) Brinell hardness number
    (D) Toughness

7. 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) Crown bevel gears
    (B) Angular bevel gears
    (C) Mitre gears
    (D) Internal bevel gears

8. Brittle coating technique is used for
    (A) Determining brittleness
    (B) Protecting metal against corrosion
    (C) Protecting metal against wear and tear
    (D) Experimental stress analysis

9. Stress concentration is caused due to
    (A) Variation in properties of material from point to point in a member
    (B) Pitting at points or areas at which loads on a member are applied
    (C) Abrupt change of section
    (D) All of the above

10. The endurance limit of a material with finished surface in comparison to rough surface is
    (A) More
    (B) Less
    (C) Same
    (D) More or less depending on quantum of load

11. When screw threads are to be used in a situation where power is being transmitted in one direction only, then the screw threads suitable for this will be
    (A) Knuckle threads
    (B) Square threads
    (C) Acme threads
    (D) Buttress threads

12. Slenderness ratio is the ratio of
    (A) Effective length of column to least radius of gyration of the column
    (B) Width of column to depth of column
    (C) Maximum size of column to minimum size of column
    (D) Effective length of column to width of column

13. Plastic flow in ductile materials
    (A) Increases the seriousness of static loading stress concentration
    (B) Lessens the seriousness of static loading stress concentration
    (C) Has no effect on it
    (D) Depends on other considerations

14. The size of a gear is usually specified by
    (A) Pressure angle
    (B) Pitch circle diameter
    (C) Circular pitch
    (D) Diametral pitch

15. When the speed of belt increases,
    (A) The coefficient of friction between the belt and pulley decreases
    (B) The coefficient of friction between the belt and pulley increases
    (C) The power transmitted will decrease
    (D) The power transmitted will increase

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