Virtual Labs

In counter flow heat exchangers between two fluids

a: Both the fluids at inlet are in their hottest state Explanation

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b: Both the fluids at exit are in their hottest state Explanation

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c: One fluid in hottest state and the other in coldest state Explanation

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d: Any combination possible depending heat exchanger design Explanation

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A heat exchanger is used to heat cold water (CP = 4.18 kJ/kgK) entering at 12 ºC at a rate of 1.2 kg/s by hot air (CP = 1.0 kJ/kgK) at 90ºC at rate of 2.5 kg/s. The highest rate of heat transfer in the heat exchangers is:

a: 82kW Explanation

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b: 195kW Explanation

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c: 391kW Explanation

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d: None of these Explanation

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Air can be best heated by steam in a heat exchanger of

a: Plate type Explanation

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b: Double pipe type with fins on steam side Explanation

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c: Double pipe type with fins on air side Explanation

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d: Shell and tube type Explanation

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Which type of heat exchanger an automobile radiator is?

a: Parallel flow type Explanation

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b: Counter flow type Explanation

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c: Regenerator type Explanation

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d: Cross flow type Explanation

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Which of the following statements is correct?

a: In counter flow heat exchangers, fluids enter and leave at perpendicular ends Explanation

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b: In cross flow heat exchangers, fluid flow is in the same direction Explanation

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c: In parallel flow heat exchangers, fluids enter and leave at opposite ends Explanation

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d: In double pipe heat exchangers, one pipe is fixed concentrically inside a larger pipe Explanation

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In a parallel flow heat exchanger, the two fluid streams hot and cold travel _______

a: in the same direction Explanation

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b: in the opposite direction Explanation

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c: initially in the same direction and then in the opposite direction Explanation

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d: initially in the opposite direction and then in the same direction Explanation

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Heat Exchanger