An ideal heat engine exhausting heat at 77^(@)Cis to have a 30% efficiency. It must take heat at

An ideal heat engine exhausting heat at 77^(@)Cis to have a 30% effici

1.	An ideal heat engine exhausting heat at 77^(@)Cis to have a 30% efficiency. It must take heat at
Answer» `127^(@)C` `227^(@)C` `327^(@)C` `673^(@)` Answer :B