20651. Which one of the following places was famous as a seat of Mahayana learning?
20652. What is the steam economy in case of a single effect evaporator system ?
20653. If average heat transfer co-efficient is ha and the local coefficient at the end of the plate is hl then in case of heat transfer to a fluid flowing over a flat plate, heated over its entire length
20654. jH factor for heat transfer is not a function of the __________ number.
20655. The Fourier number (defined as a.t/L2) is used in the analysis of problem involving heat transfer by
20656. The energy radiated from a surface Q at absolute temperature T is related as
20657. Baffles are provided in heat exchangers to increase the
20658. 200 kg of solids (on dry basis) is subjected to a drying process for a period of 5000 seconds. The drying occurs in the constant rate period with the drying rate as, Nc = 0.5 x 10-3 kg/m2.s. The initial moisture content of the solid is 0.2 kg moisture/kg dry solid. The interfacial area available for drying is 4 m2/1000 kg of dry solid. The moisture content at the end of the drying period is (in kg moisture/kg dry solid)
20659. In case of a vertical tube evaporator, with increase in the liquor level, the
20660. The ratio of total radiating power to the absorptivity of the body depends upon the __________ as per Kirchoffs law.
20661. For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally
20662. A 2-4 heat exchanger involves
20663. In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always
20664. With increase in temperature, the thermal conductivity of steel
20665. Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids ?
20666. The main function of baffles provided in a shell and tube heat exchanger is to
20667. In a single effect evaporator, the economy is
20668. LMTD correction factor which is to be applied for a cross-flow heat exchanger increases with increase in the number of shell passes. Its value for a single pass cross flow heat exchanger is
20669. Which of the following is not concerned with the heat transfer?
20670. Latent heat absorbed by 1 lb of water at 212°F, when it is changed to steam at 212°F, may be around __________ BTU.
20671. In counter flow compared to parallel flow,
20672. The thermal radiative flux from a surface of emissivity = 0.4 is 22.68 kW/m2. The approximate surface temperature (K) is
(Stefan-Boltzman constant = 5.67xl0-8 W/m2.K4)
20673. Crystallisation of solids from a homogeneous solution is a/an __________ process.
20674. A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is
20675. Value of Prandtl number for water ranges from
20676. Heat transfer in the laminar sublayer in case of a liquid flowing through a pipe, is mostly by
20677. Among liquids, water has a comparatively high value of thermal conductivity, due to its
20678. Reynold's analogy states that (where, St = Stanton number f = friction factor)
20679. For evaporation of viscous solution in a multiple effect evaporator, the prefered feeding scheme is
20680. The sum of reflectivity and absorptivity for an opaque body is equal to
20681. The film thickness for laminar film condensation on vertical surface __________ from top to bottom.
20682. In case of a multipass shell and tube heat exchanger, providing a baffle on the shell side __________ the heat transfer rate.
20683. The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness)
20684. Heat transfer co-efficient (h1) for liquids increases with
20685. A diathermaneous substance __________ the thermal radiation completely.
20686. A hot body will radiate heat most rapidly, if its surface is
20687. Evaporation of 1kg of water from a solution in a single effect evaporator requires about __________ kg of steam.
20688. A metal wire of 0.01 m dia and thermal conductivity 200 W/m.K is exposed to a fluid stream with a convective heat transfer coefficient of 100 W/m2.K. The Biot number is
20689. Analogy between mass and heat transfer is not applicable in case of
20690. A __________ surface has the maximum thermal emissivity out of the following.
20691. Radiant energy received by a body is proportional to (where, d = the distance between the object emitting radiation and that receiving it.)
20692. Mechanical recompression evaporation is used in the production of
20693. A measure of the extent to which viscous heating is important relative to the heat flow resulting from the impressed temperature difference is represented by the __________ number.
20694. Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be
20695. The purpose of providing a 'catchall' in the vapor line of an evaporator is to
20696. What is the thermal conductivity of a perfect heat insulator ?
20697. 'Fouling factor' used in the design of a multipass shell and tube heat exchanger is a
20698. A fluid is flowing inside the inner tube of a double pipe heat exchanger with diameter 'd'. For a fixed mass flow rate, the tube side heat transfer co-efficient for turbulent flow conditions is proportional to
20699. Prandtl and Reynolds analogy are same, when Prandtl number is
20700. Heat transfer occurs by natural convection because change in temperature causes difference in