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Pressure of compressed air is kept during preheating by CAPS?  (i) 1 to 2 kg/cm2  
 (ii) .1 to .2 kg/cm2
 (iii) 2 to 3 kg/cm2
 (iv) 0.2 to 0.3 kg/cm2*
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(iv) 0.2 to 0.3 kg/cm2*
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