Machine Design Objective Questions with Answers - Set 03

Practice Test: Question Set - 03


1. The load cup of a screw jack is made separate from the head of the spindle to
    (A) Prevent the rotation of load being lifted
    (B) Enhance the load carrying capacity of the jack
    (C) Reduce the effort needed for lifting the working load
    (D) Reduce the value of frictional torque

2. The centrifugal tension in belts
    (A) Decreases the power transmitted 
    (B) Increases the power transmitted 
    (C) Increase the wrap angle 
    (D) Increases the belt tension without increasing power transmission

3. Stress concentration in cyclic loading is more serious in
    (A) Ductile materials
    (B) Brittle materials
    (C) Equally serious in both cases
    (D) Depends on other factors

4. Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to
    (A) Dynamic loading
    (B) Static loading
    (C) Combined static and dynamic loading
    (D) Completely reversed loading

5. An Involute pinion and gear are in mesh. If both have the same size of addendum, then there will be interference between the
    (A) Tip of the pinion and flank of gear
    (B) Tip of the gear and flank of pinion
    (C) Flanks of both gear and pinion
    (D) Tip of both gear and pinion

6. Pick up wrong statement. Fatigue strength can be increased by
    (A) Cold working
    (B) Shot peening
    (C) Grinding and lapping surface
    (D) Hot working

7. Which of the following is not correct procedure to increase the fatigue limit?
    (A) Cold working
    (B) Shot peening
    (C) Surface decarburisation
    (D) Under stressing

8. Which of the following screw thread is used for power transmission in one direction only?
    (A) Square threads
    (B) Multiple threads
    (C) Acme threads
    (D) Buttress threads

9. Coaxing is the procedure of increasing
    (A) Metal strength by cycling
    (B) Metal hardness by surface treatment
    (C) Metal resistance to corrosion by coating
    (D) Fatigue limit by over-stressing the metal by successively increasing loadings

10. Which of the following statement is correct for gears?
    (A) The pitch circle diameter is equal to the product of module and number of teeth
    (B) The addendum is less than dedendum
    (C) The pitch circle is always greater than the base circle
    (D) All of the above

11. The belt slip occurs due to
    (A) Heavy load
    (B) Loose belt 
    (C) Driving pulley too small
    (D) Any one of the above 

12. Which is correct statement? Stress concentration in static loading is
    (A) Very serious in brittle materials and less serious in ductile materials
    (B) Very serious in ductile materials and less serious in brittle materials
    (C) Equally serious in both types of materials
    (D) Seriousness would depend on other factors

13. The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that
    (A) It is subjected to a higher cyclic loading than the outer side
    (B) It is subjected to a higher stress than the outer side
    (C) It is more stretched than the outer side during the manufacturing process
    (D) It has a lower curvature than the outer side

14. The notch angle of the Izod impact test specimen is
    (A) 10°
    (B) 2
    (C) 3
    (D) 45°

15. In Vickers hardness testing, the pyramid indentor apex is
    (A) 40°
    (B) 122°
    (C) 136°
    (D) 152°

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