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MCQOPTIONS
This section includes 8247 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 5251. |
The difficulty of liquid distribution in packed towers is accentuated, when the ratio of tower diameter to packing diameter is |
| A. | < 30 |
| B. | < 7 |
| C. | > 7 < 15 |
| D. | > 20 < 50 |
| Answer» C. > 7 < 15 | |
| 5252. |
A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator |
| A. | is economical in operation. |
| B. | employs high velocity, high heat transfer rate and less heating surface requirement. |
| C. | employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle. |
| D. | both (b) & (c). |
| Answer» E. | |
| 5253. |
__________ shaped roof is most commonly used for cylindrical tanks. |
| A. | Cone |
| B. | Dome |
| C. | Umbrella |
| D. | Flat |
| Answer» B. Dome | |
| 5254. |
In a thin cylindrical shell, the hoop stress is __________ stress. |
| A. | radial |
| B. | circumferential tensile |
| C. | compressive |
| D. | longitudinal |
| Answer» C. compressive | |
| 5255. |
Commercial packed scrubbers are normally designed for a pressure drop range of __________ mm water coloumn per metre of packed height. |
| A. | 4-8 |
| B. | 17-34 |
| C. | 52-68 |
| D. | 88-105 |
| Answer» C. 52-68 | |
| 5256. |
Hole diameter of the seive trays in the distillation column ranges from __________ mm. |
| A. | lto3 |
| B. | 4 to 8 |
| C. | 3 to 12.5 |
| D. | 12.5 to 18.5 |
| Answer» D. 12.5 to 18.5 | |
| 5257. |
Factor of safety (i.e., overdesign factor) in heat transfer equipments is about __________ percent more than the actual/theoretical design factor. |
| A. | 5-10 |
| B. | 15-20 |
| C. | 30-35 |
| D. | 35-40 |
| Answer» C. 30-35 | |
| 5258. |
For annular flow of a fluid, the ratio of the equivalent diameter for pressure drop calculation to the equivalent diameter for heat transfer calculation is |
| A. | <img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/585-320-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/585-320-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/585-320-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/585-320-4.png"> |
| Answer» B. <img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/585-320-2.png"> | |
| 5259. |
Which of the following types of reactors is the safest from operation point of view ? |
| A. | A vapor phase reactor. |
| B. | Pot type reactor. |
| C. | A liquid phase reactor. |
| D. | A liquid phase catalytic reactor. |
| Answer» B. Pot type reactor. | |
| 5260. |
In a bag filter, the pressure drop increases directly as the |
| A. | density of the gas, but is independent of the viscosity of the gas. |
| B. | density of the gas and inversely as viscosity of the gas. |
| C. | viscosity of the gas and inversely as density of the gas. |
| D. | none of these. |
| Answer» C. viscosity of the gas and inversely as density of the gas. | |
| 5261. |
The LMTD correction factor (FT) is applied in __________ heat exchangers. |
| A. | 1-1 cocurrent |
| B. | double pipe |
| C. | all multipass |
| D. | all (involving liquid/liquid heat transfer) |
| Answer» D. all (involving liquid/liquid heat transfer) | |
| 5262. |
Movement of pipeline caused by thermal expansion is taken care by providing |
| A. | expansion joint. |
| B. | changes in its direction. |
| C. | change in the shape of pipeline. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 5263. |
For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for diaofthe tank in question), the thickness of the courses of shell |
| A. | decreases upwards. |
| B. | increases upwards. |
| C. | remains same throughout. |
| D. | may decrease or increase upwards depending upon whether vacuum or positive pressure would be maintained inside the shell. |
| Answer» B. increases upwards. | |
| 5264. |
The necessary wall thickness for a metallic storage vessel is a function of the |
| A. | ultimate tensile strength (or yield point) of the material and operating temperature. |
| B. | operating pressure and welding/joint efficiency. |
| C. | diameter of the vessel. |
| D. | all (a); (b) and (c). |
| Answer» E. | |
| 5265. |
In a multiple effect evaporator system having 'n' effects, the amount of water evaporated per unit surface area in approximately equal to __________ times that in a single effect. |
| A. | 'n'th |
| B. | (1/n)th |
| C. | 0.5 nth |
| D. | 1.5 nth |
| Answer» C. 0.5 nth | |
| 5266. |
Apex angle of conical heads used in the bottom heads of chemical process equipments is usually |
| A. | 30 |
| B. | 45 |
| C. | 60 |
| D. | 75 |
| Answer» D. 75 | |
| 5267. |
Pressure drop due to pipe fittings can be estimated by the equation, , where, Le = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of (dimensionless) for 45 elbow and 180 close return bends would be respectively around |
| A. | 5 and 10 |
| B. | 45 and 75 |
| C. | 180 and 300 |
| D. | 300 and 500 |
| Answer» C. 180 and 300 | |
| 5268. |
Tube wall thickness depends on the cor-rosiveness of the fluids and their operating pressure & temperature and is specified by Birmingham wire gauge (B.W.G)-a number which varies from 8 to 18 with the numbers 14 and 16 being more commonly used. Outside diameter of tubes varies from about 15 to 50 mm; however a tube of less than __________ mm outside diameter is generally not recommended for fouling fluids. |
| A. | 16 |
| B. | 19 |
| C. | 28 |
| D. | 38 |
| Answer» C. 28 | |
| 5269. |
Angled baffles are preferred in the agitation tank to control the swirling action; if the viscosity of the liquid to be mixed is about 200 poise. However, the baffle may be completely eliminated for mixing liquids having viscoisty above __________ poise. |
| A. | 300 |
| B. | 600 |
| C. | 1000 |
| D. | 1500 |
| Answer» C. 1000 | |
| 5270. |
Ratio of tube length to shell diameter for a shell and tube heat exchanger is |
| A. | 8 : 1 to 12 : 1 for both liquid-liquid and gas-gas heat exchangers. |
| B. | 4 : 1 to 8 : 1 for liquid-liquid exchanger. |
| C. | < 4 : 1 for gas-gas exchangers. |
| D. | both(b) & (c). |
| Answer» E. | |
| 5271. |
The dust collection efficiency of a cyclone separator |
| A. | decreases with increase in gas flow rate. |
| B. | is inversely proportional to the mass of the dust particle. |
| C. | is directly proportional to the radius of the dust particle path. |
| D. | none of these. |
| Answer» E. | |
| 5272. |
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 |
| A. | |
| B. | 1 |
| C. | 20.8 |
| D. | 2 |
| Answer» C. 20.8 | |
| 5273. |
Kopp's rule is helpful in finding the |
| A. | heat capacities of solids. |
| B. | heat capacities of gases. |
| C. | molal heat capacities of gases. |
| D. | activation energy. |
| Answer» B. heat capacities of gases. | |
| 5274. |
Number of gm moles of solute dissolved in one litre of a solution is called its |
| A. | equivalent weight |
| B. | molarity |
| C. | molality |
| D. | normality |
| Answer» C. molality | |
| 5275. |
A gas at 0 C is cooled at constant pressure until its volume becomes half the original volume. The temperature of the gas at this state will be |
| A. | -136.5 C |
| B. | - 136.5 K |
| C. | -273 C |
| D. | 0 K |
| Answer» B. - 136.5 K | |
| 5276. |
A solution with reasonably permanent pH is called a/an __________ solution. |
| A. | ideal |
| B. | non-ideal |
| C. | buffer |
| D. | colloidal |
| Answer» D. colloidal | |
| 5277. |
The value of Trouton's ratio ( b/Tb) for a number of substances is 21 (where, b = molal that of vaporisation of a substance at its normal boiling point, KCal/kg. mole and Tb = normal boiling point, K). The Kis-tyakowsky equation is used for calculation of Trouton's ratio of __________ liquids. |
| A. | polar |
| B. | non-polar |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 5278. |
At what temperature, given mass of a gas that occupies a volume of 2 litres at N.T.P. will occupy a volume of 4 litres, if the pressure of the gas is kept constant ? |
| A. | 273 C |
| B. | 273 K |
| C. | 100 C |
| D. | 200 C |
| Answer» B. 273 K | |
| 5279. |
1 kg/m2 is equal to __________ mm water column. |
| A. | 1 |
| B. | 10 |
| C. | 100 |
| D. | 1000 |
| Answer» B. 10 | |
| 5280. |
An equation for calculating vapour pressure is given by, log10 P = A - B(t + c). This is called the |
| A. | Kistyakowsky equation |
| B. | Antonic equation |
| C. | Kopp's rule |
| D. | Trouton's rule |
| Answer» C. Kopp's rule | |
| 5281. |
The value of the gas-law constant 'R' is 1.987 |
| A. | kcal/kg-mole. C |
| B. | Btu/lb-mole. R |
| C. | kcal/kg-mole. K |
| D. | both (b)& (c) |
| Answer» E. | |
| 5282. |
Kinetic theory of gases stipulates that, the |
| A. | energy is lost during molecular collisions. |
| B. | molecules possess appreciable volume. |
| C. | absolute temperature is a measure of the kinetic energy of molecules. |
| D. | none of these. |
| Answer» D. none of these. | |
| 5283. |
Solutions having the same osmotic pressure are called __________ solutions. |
| A. | dilute |
| B. | ideal |
| C. | isotonic |
| D. | saturated |
| Answer» D. saturated | |
| 5284. |
A vapor that exists above its critical temperature is termed as a __________ vapor. |
| A. | saturated |
| B. | unsaturated |
| C. | gaseous |
| D. | sub-cooled |
| Answer» D. sub-cooled | |
| 5285. |
Weight of 56 litres of ammonia at N.T.P. is __________ gm. |
| A. | 2.5 |
| B. | 42.5 |
| C. | 56 |
| D. | 2800 |
| Answer» C. 56 | |
| 5286. |
Number of evaporators which can be used in service in a multiple effect evaporation system is limited by the |
| A. | practical limit reached, due to low heat transfer rate because of inadequate temperature difference. |
| B. | economic limit reached, when the plant cost exceeds the saving of steam. |
| C. | both (a) & (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 5287. |
The forces causing the vaporisation of liquid are derived from the Kinetic energy of translation of its molecules. The heat of vaporisation |
| A. | increases with pressure rise. |
| B. | decreases with increasing pressure. |
| C. | becomes zero at the critical point. |
| D. | both (b) & (c). |
| Answer» E. | |
| 5288. |
For a neutral solution (pH = 7), the value of[H+] [OH-] is equal to |
| A. | 0 |
| B. | 1 |
| C. | < 1 |
| D. | > 1 |
| Answer» C. < 1 | |
| 5289. |
For a given fluid, as the pipe diameter increases, the pumping cost |
| A. | decreases. |
| B. | increases. |
| C. | remains unaffected. |
| D. | may increase or decreaes depending upon whether the fluid is Newtonian or non-Newtonion. |
| Answer» B. increases. | |
| 5290. |
Maximum acceptable total liquid gradient over a tray is about __________ mm. |
| A. | 5.5 |
| B. | 12.5 |
| C. | 30.5 |
| D. | 45.5 |
| Answer» C. 30.5 | |
| 5291. |
In case of a 'thin' pressure vessel, the ratio of its diameter to wall thickness is |
| A. | < 10 |
| B. | > 10 |
| C. | > 20 |
| D. | 30 |
| Answer» C. > 20 | |
| 5292. |
High pressure fluid in a shell and tube heat exchanger should preferably be routed through the |
| A. | tubes to avoid the expansion of high pressure shell construction. |
| B. | shell side for smaller total pressure drop. |
| C. | shell side, if the flow is counter-current and tube side if the flow is co-current. |
| D. | shell side for large overall heat transfer co-efficient. |
| Answer» B. shell side for smaller total pressure drop. | |
| 5293. |
Bubble cap tray is the most commonly used tray in large distillation column, because |
| A. | of its flexibility and nearly constant efficiency under varying conditions of operation. |
| B. | it incurs less pressure drop as compared to any other try designed for the same duty. |
| C. | it eliminates the foaming and entrain-ment tendency during operation. |
| D. | none of these. |
| Answer» B. it incurs less pressure drop as compared to any other try designed for the same duty. | |
| 5294. |
Which of the following is the best tube material from thermal conductivity point of view alone? |
| A. | Aluminium |
| B. | Stainless steel |
| C. | Copper |
| D. | Carbon steel |
| Answer» D. Carbon steel | |
| 5295. |
Normal screwed fittings are used for pipes upto a diameter of __________ inches. |
| A. | 1.5 |
| B. | 3 |
| C. | 5 |
| D. | 7 |
| Answer» C. 5 | |
| 5296. |
Value of Peclet number = , is the representative of |
| A. | laminar flow. |
| B. | complete back mixing, |
| C. | plug flow. |
| D. | eddy diffusivity = 0. |
| Answer» D. eddy diffusivity = 0. | |
| 5297. |
for a Tee (used as elbow, entering branch) would be |
| A. | less than that for Tee (used as elbow, entering run). |
| B. | more than that for Tee (used as elbow, entering run). |
| C. | around 90. |
| D. | both (b) and (c). |
| Answer» E. | |
| 5298. |
In most of the shell and tube heat exchangers, the tube pitch is generally __________ the tube diameter. |
| A. | less than |
| B. | 1.25-1.50 times |
| C. | 2.5 times |
| D. | one-fourth of |
| Answer» C. 2.5 times | |
| 5299. |
In a distillation column, bubble caps are located on trays with a pitch of __________ times the outside diameter of the caps. |
| A. | 1.3 to 2 |
| B. | 1.6 to 2 |
| C. | 2.5 |
| D. | 1.5 to 3 |
| Answer» B. 1.6 to 2 | |
| 5300. |
1.2 to 3.8 cms is the value of the |
| A. | downcomer liquid seal in case of a balanced tray design. |
| B. | static submergence in case of a bubble cap tray for column operating under pressure ( 1 atm.). |
| C. | skirt clearance for bubble caps. |
| D. | all (a), (b) and (c). |
| Answer» E. | |