61. When a helical compression spring is cut into halves, the stiffness of the resulting spring will be
same
double
one-half
one-fourth
✅ The correct answer is option B.
Machine Design MCQs
62. A connecting rod subjected to an axial load may buckle in the plane perpendicular to the plane of motion of the connecting rod.
Correct
Incorrect
✅ The correct answer is option A.
63. A key way lowers
the strength of the shaft
the rigidity of the shaft
both the strength and rigidity of the shaft
the ductility of the s
✅ The correct answer is option C.
64. In designing thick cylinders, the equation used is
Lame’s equation
Birnie’s equation
Clavarinos’ equation
all of these
✅ The correct answer is option D.
65. A spring of stiffness 1000 N/m is streteched initially by 100 mm from the undeformed position. The work required to stretch it by another 100 mm is
5 N-m
7 N-m
10 N-m
15 N-m
✅ The correct answer is option D.
66. The working of metals above the recrystallisation temperature is known as hot working.
TRUE
FALSE
✅ The correct answer is option A.
67. A connecting rod is four times strong in buckling about Y-axis than about X-axis.
Agree
Disagree
✅ The correct answer is option A.
68. Tearing resistance required to tear off the plate per pitch length is (where p = Pitch of rivets, d = Dia. of rivet hole, and σt = Permissible tensile stress for plate material)
p.d.σt
p.t.σt
(p – d)σt
(p – d)t.σt
✅ The correct answer is option D.
69. The metal suitable for bearings subjected to heavy loads is
silicon bronze
white metal
monel metal
phosphor bronze
✅ The correct answer is option B.
70. When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl’s stress factor, and W = Axial compressive load on the spring)
✅ The correct answer is option D.