Which of the following is the best tube material from thermal conductivity point of view alone? Carbon steel Stainless steel Copper Aluminium TRUE ANSWER : ? YOUR ANSWER : ?
In inclined long tube vertical evaporators, the tubes are inclined at an angle of 60° 90° 15° 45° TRUE ANSWER : ? YOUR ANSWER : ?
Pick out the wrong statement pertaining to a shell and tube heat exchanger. The minimum value of baffle spacing is 50 mm The maximum value of baffle spacing is equal to the I.D. of the shell The maximum unsupported tube span is generally about 75 times tube diameter, but is reduced to about 60 times for aluminium, copper & alloys of these Disk and doughnut baffle is the most commonly used baffle TRUE ANSWER : ? YOUR ANSWER : ?
The LMTD correction factor (FT) is applied in __________ heat exchangers. 1-1 cocurrent All multipass All of these Double pipe TRUE ANSWER : ? YOUR ANSWER : ?
In a shell and tube heat exchanger, the overall heat transfer co-efficient is proportional to the tube side (volumetric flow rate)0.8. This is valid, only when the ratio of the tube side film resistance to the total resistance is almost equal to 20.8 ∞ 1 2 TRUE ANSWER : ? YOUR ANSWER : ?
Filtration rate is affected by the Pressure drop across the cake & filter medium Area of filtering surface & the viscosity of filtrate All of these Cake & filter medium resistance TRUE ANSWER : ? YOUR ANSWER : ?
Pressure differential maintained across a continuous rotary vacuum filter is in the range of __________ mm Hg column. 50 to 100 250 to 500 600 to 700 100 to 150 TRUE ANSWER : ? YOUR ANSWER : ?
Back-trapping in a distillation column results due to Low gas velocity Excessive liquid gradient over the tray High gas velocity Low reflux ratio TRUE ANSWER : ? YOUR ANSWER : ?
The diameter of a propeller agitator used in agitation tank ranges from __________ percent of the tank diameter and its peripherial speed is normally 300 to 500 metres/minute. 55 to 75 15 to 30 40 to 50 5 to 10 TRUE ANSWER : ? YOUR ANSWER : ?
In seive plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally __________ times the hole diameter to give the required hole area. 10 to 15 0.5 to 1.5 2.5 to 4.0 5 to 10 TRUE ANSWER : ? YOUR ANSWER : ?