If the total cost is greater than the total benefits and NPV turns negative, then under the BCR and IRR likely will be reduced to zero. This means that the project is not feasible.
If the total cost is greater than the total benefits and NPV becomes negative, the IRR and BCR will probably be reduced to about zero. This means that the project is not feasible.
If the total cost is greater than the total efficiency and NPV becomes negative, then IRR and BCR may be reduced to zero or one. This means that the project is not feasible.