Check below design of machine elements MCQ with answer.
Q.no.1 The causes of stress concentration are
A : Variations in properties of materials
B : Abrupt change in cross section
C : Discontinuities in components
D : any one of the above
Q.no 2. The Number of stress cycles that the standard specimen can complete before
appearance of first fatigue crack is
A : fatigue life
B : endurance limit
C : ultimate strength
D : yield strength
Q.no 3. If nominal diameter of screw thread=50mm and pitch=10mm then the mean diameter
of the screw thread will be?
A : 40mm
B : 60mm
C : 55mm
D : 45mm
Q.no 4. A closely-coiled helical spring is acted upon by an axial force. The maximum shear
stress developed in the spring is “T” . Half of the length of the spring is cut off and the
remaining spring is acted upon by the same axial force. The maximum shear stress in the
spring the new condition will be
A : T/2
B : T
C : 2T
D : 4T
Q.no 5. A self-locking screw has
A : fine threads
B : coarse threads
C : two nuts
D : coefficient of friction more than tangent of lead angle
Q.no 6. The key, which fits in the keyway of hub, only is called,
A : sunk key
B : feather key
C : Woodruff key
D : Kennedy key
Q.no 7. A flanged pipe joint will be a leak-proof joint, if the circumferential pitch of the bolts
is (where d = Diameter of bolt hole)
A : Less than 20d
B : Greater than 30d
C : Between 20d and 30d
D : Equal to inside diameter of pipe
Q.no 8. Stress concentration occurs due to
A : abrupt change in cross-section
B : discontinuities in component
C : internal cracks and flaws
D : any one of the above
Q.no 9. A spring used to absorb shocks and vibrations is
A : closely-coiled helical spring
B : open-coiled helical spring
C : conical spring
D : torsion spring
Q.no 10. A hollow shaft will transmit a __ torque than a solid shaft of the same mass
and same material.
A : Smaller
B : Greater
C : Medium
D : None of these
Answer for Question No 1. is d
Answer for Question No 2. is a
Answer for Question No 3. is d
Answer for Question No 4. is b
Answer for Question No 5. is d
Answer for Question No 6. is a
Answer for Question No 7. is c
Answer for Question No 8. is d
Answer for Question No 9. is a
Answer for Question No 10. is b
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