| When shifting heat exchangers such as main engine lube-oil coolers, what statement represents the recommended operating procedure if the shift is to occur during engine operation? |
| A) First, secure cooling water to the off-going cooler, then secure lube oil to the off-going cooler. Next, introduce lube oil to the on-coming cooler, then introduce cooling water to the on-coming cooler. |
| B) First, introduce lube oil to the on-coming cooler, then introduce cooling water to the on-coming cooler. Next, secure cooling water to the off-going cooler, then secure lube oil to the off-going cooler. |
| C) First, introduce cooling water to the on-coming cooler, then introduce lube oil to the on-coming cooler. Next, secure lube oil to the off-going cooler, then secure cooling water to the off-going cooler. |
| D) First, secure lube oil to the off-going cooler, then secure cooling water to the off-going cooler. Next, introduce cooling water to the on-coming cooler, then introduce lube oil to the on-coming cooler. |
