101. Bolts in the flanged end of pressure vessel are usually pre-tensioned. Indicate which of the following statements is true
     

1. 1. Pre-tensioning helps to seal the pressure vessel
      

   
   
   

   2. Pre-tensioning increase the fatigue life of the bolts
      

   
   
   

   3. Pre-tensioning reduces the maximum tensile stress in the bolts
      

   
   
   

   4. Pre-tensioning helps to reduce the effect of pressure pulsations in the pressure vessels

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

---

102. The bolts in a rigid flanged coupling connecting two shafts transmitting power are subjected to
     

1. 1. shear force and bending moment
      

   
   
   

   2. axial force
      

   
   
   

   3. torsion
      

   
   
   

   4. torsion and bending moment

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

---

---

103. The bolts in a rigid flanged coupling connecting two shafts transmitting power are subjected to
     

1. 1. shear force and bending moment
      

   
   
   

   2. axial force
      

   
   
   

   3. torsion
      

   
   
   

   4. torsion and bending moment

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

---

104. The process of shot peening increases the fatigue life of steel springs mainly because it results in
     

1. 1. surface hardening
      

   
   
   

   2. increased stiffness of the material
      

   
   
   

   3. structural changes in the material
      

   
   
   

   4. residual compression at the surface

   
   
   

---

1. View Hint View Answer Discuss in Forum

   Shot preening increases fatigue life of springs

   Correct Option: D

   Shot preening increases fatigue life of springs

---

---

105. Stress concentration in a machine component of a ductile material is not so harmful as it is in a brittle material because
     

1. 1. in ductile material local yielding may distribute stress concentration
      

   
   
   

   2. ductile material has larger young's material
      

   
   
   

   3. Poisson's ratio is larger in ductile materials
      

   
   
   

   4. Modulus of rigidity is larger in ductile materials

   
   
   

---

1. View Hint View Answer Discuss in Forum

   Local yielding reduces stress concentration effect.

   Correct Option: A

   Local yielding reduces stress concentration effect.

---