Machine Design Online Practice Test - Set 13

Practice Test: Question Set - 13


1. In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by
    (A) Decreasing the cross-section area of bar
    (B) Increasing the cross-section area of bar
    (C) Remain unaffected with cross-section area
    (D) Would depend upon other factors

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

3. Which of the following material has the maximum ductility?
    (A) Copper
    (B) Mild steel
    (C) Aluminium
    (D) Zinc

4. The included angle for the British Association thread is
    (A) 29°
    (B) 55°
    (C) 47.3°
    (D) 60°

5. An open belt drive is used when
    (A) Shafts are arranged at right angles and rotate in one definite direction
    (B) Shafts are arranged parallel and rotate in the opposite directions
    (C) Shafts are arranged parallel and rotate in the same directions
    (D) Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft

6. Screws used for power transmission should have
    (A) Low efficiency
    (B) High efficiency
    (C) Very fine threads
    (D) Strong teeth

7. The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be
    (A) Same in both cases
    (B) 2 times more
    (C) 3 times more
    (D) 4 times more

8. The fatigue life of a part can be improved by
    (A) Electroplating
    (B) Polishing
    (C) Coating
    (D) Shot peening

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

10. The application of third type levers is found in
    (A) Handle of a hand pump
    (B) Hand wheel of a punching press
    (C) Lever of a loaded safety valve
    (D) A pair of tongs

11. In case of V belt drive
    (A) The belt should touch the bottom of groove in the pulley 
    (B) The belt should not touch the bottom of groove in the pulley 
    (C) The belt should not touch the sides of groove in the pulley 
    (D) None of the above

12. Which is correct statement? Stress concentration in cyclic 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. According to I.B.R., when the thickness of boiler shell (t) is greater than 8 mm, then the diameter of rivet hole (d) is obtained by
    (A) Equating tearing resistance of the plate to the shearing resistance of the rivets
    (B) Equating tearing resistance of the plate to the crushing resistance of the rivets
    (C) Equating shearing resistance to the crushing resistance of the rivets
    (D) None of the above

14. In testing a material for endurance strength, it is subjected to
    (A) Static load
    (B) Dynamic load
    (C) Impact load
    (D) Completely reversed load

15. If a material fails below its yield point, failure would be due to
    (A) Straining
    (B) Fatigue
    (C) Creep
    (D) Sudden loading

Show and hide multiple DIV using JavaScript View All Answers


Share on Google Plus

    FB Comments
    Comments

0 comments:

Post a Comment