Q.no 21. Strain energy in a leaf spring is
A : W x δ
B : W x δ/3
C : W x δ/2
D : W x δ/5
Q.no 22. In case of sunk key,
A : the keyway is cut in the shaft only
B : the keyway is cut in the hub only
C : the keyway is cut in both the shaft and the hub
D : none of the above
Q.no 23. Which type of joints is better when the product is subjected to large vibrations: welded or threaded?
A : Welded
B : Threaded
C : Both have same results
D : Depends on the magnitude of the vibrational force
Q.no 24. The maximum normal stress theory is used for
A : brittle materials
B : ductile materials
C : plastic materials
D : non-ferrous materials
Q.no 25. A tapered key which fits in a key way in the hub and is flat on the shaft, is known as
A : Feather key
B : Gib-head key
C : Wood ruff key
D : Flat saddle key
Q.no 26. Which of the following screw thread is used for transmitting power in either
direction?
A : square threads
B : trapezoidal threads
C : Buttress threads
D : (a) and (b)
Q.no 27. The modulus of elasticity of grey cast iron is
A : 207 000 N/mm2
B : 100 000 N/mm2
C : 50 000 N/mm2
D : 80 000 N/mm2
Q.no 28. Allen key is used to tighten
A : cap screw with hexagonal headd
B : cap screw with filister head
C : cap screw with hexagonal socket head
D : cap screw with flat head
Q.no 29. Knuckle joint is used for the joint between
A : tie bars in roof trusses
B : links in suspension bridge
C : fulcrum of lever and support
D : for all three applications
Q.no 30. Which of the following screw thread is used for lead screw of lathe?
A : square threads
B : trapezoidal threads
C : Buttress threads
D : V threads
Answer for Question No 21. is c
Answer for Question No 22. is c
Answer for Question No 23. is a
Answer for Question No 24. is a
Answer for Question No 25. is d
Answer for Question No 26. is d
Answer for Question No 27. is b
Answer for Question No 28. is c
Answer for Question No 29. is d
Answer for Question No 30. is b
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