Q.no 21. If the stiffness of parts held together by bolt is too large compared with the stiffness
of bolt (hard gasket), then the resultant load on the bolt is equal to
A : initial tension
B : external load
C : sum of initial tension and external load
D : higher of initial tension and external load
Q.no 22. If a close-coiled helical spring absorbs 50 N-mm of energy while extending by 5 mm, its stiffness will be
A : 2 N/mm
B : 4 N/mm
C : 6 N/mm
D : 10 N/mm
Q.no 23. In design of screw jack from buckling considerations, the end conditions are
assumed as
A : both ends are hinged
B : both ends are fixed
C : one end fixed and other hinged
D : one end fixed and other free
Q.no 24. When a close-coiled helical spring is subjected to
an axial load, it is said to be under.
A : Bending
B : Shear
C : Torshion
D : Crushing
Q.no 25. When the helical compression spring is subjected to axial compressive force, the type
of stress induced in the spring wire is,
A : tensile stress
B : compressive stress
C : bending stress
D : torsional shear stress
Q.no 26. The helix angle in case of closely coiled helical spring is
A : Less than 10°
B : 10° to 15°
C : 15° to 20°
D : More than 20°
Q.no 27. The principle of applying heat and pressure is widely used in
A : spot welding
B : seam welding
C : projection welding
D : all of these
Q.no 28. If friction angle is 30’ then the maximum efficiency of the screw is
A : 0.33
B : 0.66
C : 0.5
D : Noe of the mentioned
Q.no 29. The maximum amplitude of completely reversed stress that the standard specimen
can sustain for 1 million cycles is
A : fatigue life
B : endurance limit
C : ultimate strength
D : yield strength
Q.no 30. A spring is defined as a(an) _ machine element.
A : Plastic
B : Elastic
C : Special purpose
D : both plastic and elastic
Answer for Question No 21. is d
Answer for Question No 22. is d
Answer for Question No 23. is d
Answer for Question No 24. is c
Answer for Question No 25. is d
Answer for Question No 26. is a
Answer for Question No 27. is d
Answer for Question No 28. is a
Answer for Question No 29. is b
Answer for Question No 30. is b
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