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ESE ME 2018 Achiever Study Plan: Heat Transfer Quiz 4

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Question 1

The correct sequence for different types of heat exchangers in the decreasing order of effectiveness is

Question 2

The equation of effectiveness

for a heat exchanger is valid in the case of

Question 3

In a double-pipe counterflow heat exchanger, 1000 kg/h of oil having a specific heat 20 J/kg-K is cooled from 150⁰ C to 125⁰ C by 1250 kg/h of fluid of specific heat 16J/kg-K exchanger at 75⁰ C. In such case, the temperature at which the cooling fluid is entering the heat exchanger and LMTD will be

Question 4

The fouling factor in heat exchanger is defined as __________.

Question 5

The temperature distribution curve for a heat exchanger as shown in the figure below (with notations) refer to which one of the following?

Question 6

A counter flow shell and tube heat exchanger is used to heat water with hot exhaust gases. The water (c=4180 J/kg K) flows at the rate of 2 Kg/s and the exhaust gases (C = 1000 J/kg K) flow at the rate of 5 kg/s. If the heat transfer surface area is 32 m² and the overall heat transfer coefficient is 200 W/m² K, the NTU of the heat exchanger is

Question 7

A cross-flow type air heater has an area of 50 m². The overall transfer coefficient is 100 Wm² K; and heat capacity of the stream, be it hot or cold, is 1000 W/K. What is the NTU?

Question 8

In a counter flow heat exchanger, hot gases enter at 250 °C and leave at 100 °C. Atmospheric air enters at 50 °C and leaves at 80 °C. The heat capacity of hot fluid is less than cold fluid. The effectiveness of the heat exchanger will be