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GATE Prev Year : Heat Transfer Test-2
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Question 1
Lumped Heat-transfer analysis of a solid object suddenly exposed to a fluid medium at a different temperature is valid when _________.
Question 2
The following figure was generated from experimental data relating spectral black body emissive power to wave length at three temperatures T1, T2 and T3 (T1> T2 <T3).
The conclusion is that the measurements are
The conclusion is that the measurements are
Question 3
Water (Prandtl number = 6) flows over a flat plate such that the flow is laminar. It is heated over the entire length. Which one of the following relationship between the hydrodynamic boundary layer thickness (
) and the Thermal Boundary Layer thickness (
) is true?
) and the Thermal Boundary Layer thickness () is true? Question 4
The ratios of the laminar hydrodynamic boundary layer thickness to thermal boundary layer thickness of flows of two fluids P and Q on a flat plate are 
and 2 respectively. The Reynolds number based on the plate length for both the flows is 104. The Prandtl and Nusselt numbers for P are 
and 35 respectively. The Prandtl and Nusselt numbers for Q are respectively
and 2 respectively. The Reynolds number based on the plate length for both the flows is 104. The Prandtl and Nusselt numbers for P are and 35 respectively. The Prandtl and Nusselt numbers for Q are respectively Question 5
In a concentric counter flow heat exchanger, water flows through the inner tube at 25 °C and leaves at 42 °C. The engine oil enters at 100 °C and flows in the annular flow passage. The exit temperature of the engine oil is 50 °C. Mass flow rate of water and the engine oil are 1.5 kg/s and 1 kg/s. respectively. The specific heat of water and oil are 4178 J/kg.K and 2130 J/kg.K, respectively. The effectiveness of this heat exchanger is ___________
Question 6
What is the value of the view factor for two inclined flat surfaces having a common edge of equal width, and with an angle of 20 degrees?
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