In a heat exchanger with steam outside the tubes, a liquid gets heated to 45°C, when its flow velocity in the tubes is 2 m/s. If the flow velocity is reduced to 1 m/s, other things remaining the same, the temperature of the exit liquid will be

• A. Initially decreases and remains constant thereafter
• B. Equal to 45°C
• C. Less than 45°C
• D. More than 45°C

Answer: (D)