Chemical Engineering Basics Quiz 6

In case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean temperature difference) for counter flow as compared to that for parallel flow is___________?

Heating of ferromagnetic materials to a temperature above Curie temperature makes it __________?

High relative humidity decreases the evaporative process and as the temperature is increased, the relative humidity decreases. The comfort range for human body is the ambient temperature of 22 to 27?C with relative humidity ranging from ________ percent ?

In the diving apparatus, helium is used along with oxygen, because it is ______?

Hydro-cyclone is a______?

In extrusion of metals, which of the following statement is true ?

Hot working of lead is carried out at _____?

In case of a, centrifugal pump, the ratio h1/h2 is termed as the ______ efficiency (where, h1 = actual measured head & h2 = head imparted to the fluid by impeller)?

Hydrogen in liquid steels is dissolved__________?

In ?Imperial Smelting Process? for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following _________?

In electrical resistance welding, distortion results from the use of improper_________?

Identify the correct statement with reference to the extractive metallurgy of aluminium ?

In case of water (Prandtl number ? 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is ?

Highest cutting speed is achieved by the ________ tool material ?

Identify the false statement?

If the head is doubled in & centrifugal pump, the power required will increase in the ratio of___________?

In practice, the compression ratio of compression-ignition (CI) engine ranges from ________?

In the acid Bessemer process, the hot metal should have the following composition ?

In connection with corrosion of metals, passivation is the process that___________?

In the Bayer?s process, bauxite is digested under pressure using _____?

Hot dipping process is used for coating a low melting point metal (e.g. Pb, Sn, Zn) on iron, steel & copper having relatively higher melting points. Which of the following is not a hot dipping process ?

In multipass welds, shot peening is done after each pass to___________?

In a furnace with heating element temperature at 1700?C, the dominant mechanism of heat transfer will be___________?

If a solid is compressed adiabatically in its elastic range, its ______ remains constant ?

In the blast furnace, incorporation of water vapour in the blast gives the following effect ?

In chemical dehumidification of air_____?

In a forced draft cooling tower, water is cooled from 95 to 80?F by exposure to air with a wet bulb temperature of 70?F. In this case, the_________?

In case of brasses, with decreasing zinc percentage and increasing copper percentage, its ______ increases ?

In case of simple harmonic motion, displacement is proportional to the__________?

Heat transfer by _______ is almost absent in case of fluidised bed drying operation?

In _________ process, there is an increase in entropy with no degradation of energy ?

In Newton?s law of viscosity, which states that the shear stress is proportional to the ______ Co-efficient of viscosity is called dynamic or absolute viscosity(where, V = velocity, Vg = velocity gradient) ?

Heating the Hypo-eutectoid steels to 30?C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called_________?

If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a ______ reactor?

In a totally irreversible isothermal expansion process for an ideal gas, ?E = 0, ?H = 0. Then ?Q and ?S will be________?

In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that ?

High speed steel tools retain their hardness upto a temperature of ___________ ?C?

Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by__________?

In a good rimming steel___________?

In a drilling process, the metal is removed by both shearing & extrusion. General purpose drills are made of__________?

Hooke?s law_________?

Hollow shafts can be made as strong as solid shafts by making the twisting moments of both the shafts same. Shafts made by ______ have residual stresses ?

Hot & cold working of material causes its ________ deformation?

Hot extrusion of aluminium is done in the temperature range of _________ ?C ?

If the demand for an item is trebled and the order cost is reduced to one third, then the economic order quantity__________?

High endurance limit of carburised machine parts is because of the fact that carburisation ___________?

In inventory control theory, the economic order quantity (EOQ) is the______?

In a neutral solution___________?

If Reynolds number is greater than 1, then the_______?

In a boundary layer developed along the flow, the pressure decreases in the downstream direction. The boundary layer thickness in this case will ________?