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RVUNL ME || Heat-Transfer || Quiz 4

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Question 1

In the counter flow heat exchange, for the hot fluid the specific heat is 3 kJ/kg K, mass flow rate is 6 kg/s, inlet temperature is 150 °C and outlet temperature is 100 °C. For the cold fluid, the specific heat is 3 kJ/kg K, mass flow rate is 8 kg/s, inlet temperature is 20 °C . Neglecting the heat transfer to surrounding, the outlet temperature of the cold fluid in °C is ________.

Question 2

In a heat exchanger, the hot liquid enters with a temperature of 180 °C and leaves at 160°C. The cooling fluid enters at 30 °C and leaves at 110 °C. The capacity ratio of the heat exchanger is

Question 3

In a shell and tube heat exchanger, baffles are provided on the shell side to ________.

Question 4

For the parallel flow heat exchange the effectiveness is 0.4 and capacity ratio is unity, then NTU is___.

Question 5

A new heat exchanger is inducted in a power plant with an overall heat transfer coefficient 5000 W/m²-K. After continuous run of 2 years, overall heat transfer coefficient reduces to 2000 W/m²-K due to various factors like chemical deposition, scale and sludge formation. Then what will be fouling factor under this condition?

Question 6

A heat exchanger is used to heat cold water (C_P = 4.18 kJ/kg-K) entering at 15 °C at a rate of 1.2 kg/s by hot air (C_P = 1.005 kJ/kg-K) entering at 90 °C at a rate of 2.5 kg/s. The highest rate of heat transfer in the heat exchanger is _____ kW.

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AE & JE Exams Mechanical Engineering

Mar 27AE & JE Exams