1 3-1 II MID HEAT TRANSFER & MEFA QUESTIONS

Heat Transfer Questions :-

1. A plate of size w20cm*30cm is used as a water heater in a process plant. The temperature of water is 200 c while the heater plate is maintained at a temperature of 1200c.determine the heat transfer rate by free convection when 20cm side of the heater is kept vertical.

2. Hot oil is to be cooled by water in a one shell pass eight tube passes heat exchanger.the tubes are thin walled and made of copper with an internal diameter of 14mm.the length of each tube pass is 5m and Uo=310 w/m2k. water flows through the tubes at a rate of 0.2kg/s and the oil through the shell at a rate of 0.3kg/s. the water and the oil enter at a temperature of 200c and 1500c respectively. determine rate of the water and the oil enter at a temperature of the water and oil.

3. What is boiling and condensation ? briefly explain it types.4. (a) What is mean by forced convection ? explain.

(b) Water at 500c enters 1.5cm diameter and 3m long tube with a velocity of 1m/sec the tube wall is maintained at a constant temp of 90oc calculate heat transfer co-efficient and total amount of heat transfer if the exit wall temperature is 640c.

5. (a) explain the terms “hydrodynamic boundary layer” and “thermal boundary layer”.

(b) explain how are the heat exchangers classified.

MEFA Questions :-

1. Problems on journal.2. Define join stock company. Explain its features.3. Define ratios, explain its type and its limitations? 4. Define capital .explain factors of working capital?5. Problems on ratios(liquidity ratio) on capital structure ratio.

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