Heat Transfer MCQ
Test your knowledge with important Heat Transfer MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30+ more Heat Transfer MCQs on Bissoy. Bissoy App
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The Graetz number is concerned with the
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While the total emissivity of a perfect black body is unity, the same for a real body is
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Which of the following situations can be approximated to a steady state heat transfer system?
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Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids?
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Radiation heat losses from satisfactorily insulated high pressure boilar may be about __________ percent.
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Vibrations in the tubes of a shell and tube heat exchanger is induced due to the
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In forced convection, the Nusselt number is a function of
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Heat flux through several resistances in series in analogous to the current flowing through several
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The left face of a one dimensional slab of thickness 0.2 m is maintained at 80°C and the right face is exposed to air at 30°C. The thermal conductivity of the slab is 1.2 W/m.K and the heat transfer co-efficient from the right face is 10 W/m<sup>2</sup>.K. At steady state, the temperature of the right face in °C is
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In a heat exchanger with steam outside the tubes, a liquid gets heated to 45°C, when its flow velocity in the tubes is 2 m/s. If the flow velocity is reduced to 1 m/s, other things remaining the same, the temperature of the exit liquid will be
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Nusselt number is a function of Prandtl number and __________ number of fluid in natural convection heat transfer.
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Multiple effect evaporators are commonly used in the manufacture of P. Paper Q. Superphosphate R. Sugar S. Fats
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What is the unit of thermal conductivity?
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In a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used
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In a forward feed multiple effect evaporator unit
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Which is the most suitable for cold viscous feed?
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Heat transfer by __________ may not necessarily require the presence of a medium.
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The characteristic dimensionless groups for heat transfer to a fluid flowing through a pipe in laminar flow are
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Which of the following is generally considered as opaque surface towards radiations?
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Electromagnetic radiations propagate in vacuum with a velocity of __________ metre/second.
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The inside heat transfer co-efficient in case of turbulent flow of liquid in the tube side in a 1-2 shell and tube heat exchanger is increased by __________ times, when the number of tube passes is increased to 8.
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The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K<sub>0</sub> + at. where, K is the thermal conductivity and T is the temperature (in °K). The units of 'a' in SI system will be
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The outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50°C in industrial practice mainly to avoid
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Dietus-Boelter equation used for the determination of heat transfer co-efficient is valid
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For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are
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With increase in temperature, the total emissivity of conductors
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Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is
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Prandtl number is the reciprocal of
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Nusselt number (for forced convection heat transfer) is a function of the __________ number.
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jH factor for heat transfer is not a function of the __________ number.