Can one claim credit of service tax paid on fa?

For a manufacturing company;

1.Can the company claim credit of service tax paid on purchase and installtion fixed asset ? If yes then, pl quote the section or rule.

2.When can the credit of service tax be availed in case the services are covered under reverse charge mech?

3.When can the credit of service tax be availed in case of services for whome the abatement is applicable ?