1. 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/m 2k. 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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2. 2
3-1 II MID HEAT TRANSFER & MEFA QUESTIONS
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