Cenvat Credit Rules levying penalties in terms of sec. 11AC of Excise Act are valid and intra-vires

Cenvat Credit : Rule 15(2) of CENVAT Credit Rules, 2004 and 13(2) of CENVAT Credit Rules, 2002 providing for penalty in terms of section 11AC (in case of fraud, collusion, etc.) is valid and within rule-making power of Central Government