Machine Design Miscellaneous
 The bolts in a rigid flanged coupling connecting two shafts transmitting power are subjected to

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NA
Correct Option: A
NA
 The bolts in a rigid flanged coupling connecting two shafts transmitting power are subjected to

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NA
Correct Option: A
NA
 Stress concentration in a machine component of a ductile material is not so harmful as it is in a brittle material because

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Local yielding reduces stress concentration effect.
Correct Option: A
Local yielding reduces stress concentration effect.
 In a bolted Joint two smooth members are connected with an axial tightening force of 2200 N. If the bolt used has metric threads of 4 mm pitch, the torque required for achieving the tightening force is

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Tightening force = 2200 N
Pitch = 4 mm = 0.004 mTorque = Tightening force × 0.004 = 1.4 Nm 2π Correct Option: C
Tightening force = 2200 N
Pitch = 4 mm = 0.004 mTorque = Tightening force × 0.004 = 1.4 Nm 2π
 A bolted Joint is shown below. The maximum shear stress, in MPa, in the bolts at A and B, respectively are

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F_{A} = F_{B} = F_{C} = 10 kN 3 F_{A} = P.e.r = 10 × 10^{3} × 150 × 40 r_{A}² + r_{B}² + r_{C}² 40² + 0² + 40²
F'_{A} = 18.75 kN = F'_{C}
Shear load at A and C
F_{R} = √(F_{A})² + (F'_{A})² = √(3.33)² + (18.75)²
F_{R} = 19.04 KNτ_{max} = 19.04 × 10^{3} (π / 4) × 10^{2}
( τ_{max} )A,C = 242.5 MPa
( τ_{max} )B = 42.44 MPa
Correct Option: A
F_{A} = F_{B} = F_{C} = 10 kN 3 F_{A} = P.e.r = 10 × 10^{3} × 150 × 40 r_{A}² + r_{B}² + r_{C}² 40² + 0² + 40²
F'_{A} = 18.75 kN = F'_{C}
Shear load at A and C
F_{R} = √(F_{A})² + (F'_{A})² = √(3.33)² + (18.75)²
F_{R} = 19.04 KNτ_{max} = 19.04 × 10^{3} (π / 4) × 10^{2}
( τ_{max} )A,C = 242.5 MPa
( τ_{max} )B = 42.44 MPa