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Bolts in the flanged end of pressure vessel are usually pre-tensioned. Indicate which of the following statements in not true.      

      (a) Pre-tensioning helps to seal the pressure vessel

      (b) Pre-tensioning increase the fatigue life of the bolts

      (c) Pre-tensioning reduces the maximum tensile stress in the bolts

      (d) Pre-tensioning helps to reduce the effect of pressure pulsations in the pressure vessels

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