20701. The ratio of kinematic viscosity to thermal diffusivity is called the __________ number.
20702. The critical radius 'r' of insulation on a pipe is given by
20703. As per Kirchoffs law, the ratio of the total radiating power to the absorptivity of a body depends on the
20704. If the baffle spacing in a shell and tube heat exchanger increases, then the Reynolds number of the shell side fluid
20705. The heat transfer by radiation from a mild steel surface is to be reduced by reducing the emissivity of the surface. This can be best achieved by
20706. __________ paint has the maximum absorption coefficient.
20707. Which of the following ores does not contain iron?
20708. Steam traps are provided in steam carrying pipelines to
20709. The Dietus-Boelter equation for convective leat transfer
cannot be used for
20710. A hot liquid is kept in a big room. The logorithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly a/an
20711. Radiation heat transfer rates does not depend upon the
20712. Which of the following is correct ?
20713. Convective heat transfer, in which heat is transferred by movement of warmed matter is described by
20714. As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient
20715. Heat transfer rate per unit area is called
20716. Log mean temperature difference (LMTD) cannot be used, if
20717. In a multipass shell and tube heat exchanger, tube side return pressure loss is equal to __________ the velocity head.
20718. For a given ambient air temperature with increase in the thickness of insulation of a hot cylinderical pipe, the rate of heat loss from the surface would
20719. In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is
20720. For what value of Prandtl number, the Col-burn analogy is valid ?
20721. In a forward feed multiple effect, the pressure build up will be
20722. Film boiling is usually not desired in commercial equipments, because
20723. For the same heat transfer area and the terminal conditions, the ratio of the capacities of a single effect evaporator to a triple effect evaporator is
20724. The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K0 + at. where, K is the thermal conductivity and T is the temperature (in °K). The units of 'a' in SI system will be
20725. Film condensation is promoted on a/an __________ surface.
20726. Dietus-Boelter equation cannot be used for molten metals mainly due to its very low
20727. If Prandtl number is greater than the Schmidt number, then the
20728. Which of the following accessories is provided in the vapor line of an evaporator for removing the entrained liquid ?
20729. Rate of heat transfer by vaporisation from pools of water is affected by the
20730. Multiple effect evaporators are commonly used in the manufacture of
P. Paper Q. Superphosphate
R. Sugar S. Fats
20731. Which of the following has the highest thermal conductivity ?
20732. Which of the following is unimportant in forced convection ?
20733. Steam is to be condensed in a shell and tube heat exchanger, 5 m long with a shell diameter of 1 m. Cooling water is to be used for removing the heat. Heat transfer co-efficient for the cooling water, whether on shell side or tube side is the same. The best arrangement is
20734. In a multiple effect evaporator, the effect of boiling point elevation is to
20735. In which field did Swathi Thirunal distinguished himself?
20736. Dropwise condensation occurs on __________ surfaces.
20737. For specified tube outside diameter, higher BWG means higher
20738. In which year the Ninth Schedule was added to the Indian Costitution?
20739. In case of a vertical tube evaporator, with increase in the liquor level, the __________ is increased.
20740. Electromagnetic radiations propagate in vacuum with a velocity of __________ metre/second.
20741. Heat flux is the time rate of heat transfer per unit
20742. Film boiling occurs at __________ pressure.
20743. Heat flux through several resistances in series in analogous to the current flowing through several
20744. Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
20745. Vacuum is generally maintained in the vapour space of an evaporator mainly to
20746. Double pipe heat exchangers are used
20747. Nusselt number (for forced convection heat transfer) is a function of the __________ number.
20748. Identify the field to which Mr.Anil Ganguly is related?
20749. Which type of heat exchanger is preferred for heavy heat loads ?
20750. Which of the following was the centre of Salt Satyagraha in Kerala during the Civil Disobedience Movement?