MCQOPTIONS
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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.
| 5301. |
In a shell and tube heat exchanger, the clearance of the tube is generally |
| A. | not less than one-fourth of the tube diameter or 3/16". |
| B. | more than the tube diameter. |
| C. | equal to the tube diameter. |
| D. | more in case of triangular pitch as compared to the square pitch tube layout. |
| Answer» B. more than the tube diameter. | |
| 5302. |
Diameter of the seive tray column is determined by the |
| A. | lower limit of vapour velocity. |
| B. | upper limit of the vapour velocity. |
| C. | hole diameter of the seive tray. |
| D. | height of the plate spacing. |
| Answer» C. hole diameter of the seive tray. | |
| 5303. |
For identical operating conditions, the pressure drop over __________ tray is the highest out of the following. |
| A. | sieve |
| B. | valve |
| C. | counterflow |
| D. | bubble cap |
| Answer» E. | |
| 5304. |
__________ is the determining factor for the number of bubble caps to be used per tray. |
| A. | Permissible slot velocity |
| B. | Tray diameter |
| C. | Liquid load |
| D. | Vapor load |
| Answer» B. Tray diameter | |
| 5305. |
Pick out the wrong statement about distillation operation |
| A. | Distillation under vacuum is a substitute for steam distillation. |
| B. | In differential (simple) distillation, the vapour is removed as soon as it is formed without appreciable condensation. |
| C. | In flash (equilibrium) distillation, a definite fraction of liquid is vaporised in such a way that the evolved vapour & residual liquids are in equilibrium with each other. |
| D. | Flash distillation, differential distillation & steam distillation are all continuous distillation processes. |
| Answer» E. | |
| 5306. |
Low pressure steam (with saturation temperature between 105 to 120 C) is usually used in the vacuum evaporators, which normally employ a vacuum of about __________ mm Hg (referred to a 760 mm mercury barometer). |
| A. | 250 |
| B. | 450 |
| C. | 650 |
| D. | 750 |
| Answer» D. 750 | |
| 5307. |
Accidents in chemical plants are mostly due to |
| A. | inadequate equipment design. |
| B. | faulty operating procedures. |
| C. | improper layout of the equipments. |
| D. | failure of equipments. |
| Answer» C. improper layout of the equipments. | |
| 5308. |
For any system, the __________ heat of solution is dependent on the temperature and the adsorbate concentration. |
| A. | integral |
| B. | differential |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 5309. |
Dissolving a solute in a solvent does not change its |
| A. | specific heat |
| B. | vapour pressure |
| C. | viscosity |
| D. | none of these |
| Answer» E. | |
| 5310. |
Which of the following is used to set the diameter of the distillation column ? |
| A. | Number of theorectical plates. |
| B. | Static submergence. |
| C. | Allowable vapour velocity. |
| D. | Length of straight rectangular weir on cross-flow tray. |
| Answer» D. Length of straight rectangular weir on cross-flow tray. | |
| 5311. |
Ponchon Savarit method is based on the use of enthalpy concentration diagram, which contains the bubble point curve (saturated liquid curve), dew point curve (saturated vapour curve) and equilibrium tie lines. As compared to McCabe-Thiele's method, this method |
| A. | is more accurate in finding the number of equilibrium stages. |
| B. | accounts for the enthalpy changes in the process. |
| C. | facilitates direct calculation of heat load on reboiler & condenser from, the diagram used in this method. |
| D. | all 'a', 'b' & 'c'. |
| Answer» E. | |
| 5312. |
In a shell and tube heat exchanger, tube side __________ of the mass velocity. |
| A. | heat transfer co-efficient is proportional to 0.8th power |
| B. | pressure drop is proportional to the square |
| C. | both 'a' & 'b' |
| D. | neither 'a' nor 'b' |
| Answer» D. neither 'a' nor 'b' | |
| 5313. |
The reaction A + B C has been conducted in a reactor as shown below. The number of boundaries around which material balance can be written, are |
| A. | 1 |
| B. | 6 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 5314. |
Heat of transition is the heat evolved or absorbed, when a substance is converted from |
| A. | vapor to liquid. |
| B. | vapor to solid. |
| C. | solid to liquid. |
| D. | one allotropic form to another allotropic form. |
| Answer» E. | |
| 5315. |
Concentration of a solution expressed in terms of __________ is independent of temperature. |
| A. | molarity |
| B. | normality |
| C. | molality |
| D. | none of these |
| Answer» D. none of these | |
| 5316. |
The average translational kinetic energy with which a gas molecule is endowed is dependent on its |
| A. | nature |
| B. | size |
| C. | absolute temperature |
| D. | all (a), (b) & (c) |
| Answer» D. all (a), (b) & (c) | |
| 5317. |
The vapor pressure of a substance, at its melting point, is __________ in the solid state as compared to that in the liquid state. |
| A. | less |
| B. | more |
| C. | same |
| D. | either (a) or (b); depends on the nature of the substance |
| Answer» D. either (a) or (b); depends on the nature of the substance | |
| 5318. |
Heat of __________ of a fuel is called its calorific value. |
| A. | formation |
| B. | combustion |
| C. | reaction |
| D. | vaporisation |
| Answer» C. reaction | |
| 5319. |
1 BTU/lb. F is equivalent to __________ kcal/kg. C. |
| A. | 1 |
| B. | 2.42 |
| C. | 1.987 |
| D. | 4.97 |
| Answer» B. 2.42 | |
| 5320. |
The combustion equations of carbon and carbon monoxide are as follows:C + O2 = CO2, H = - 394 kJ/kg . mole CO + 1/2 O2 = CO2, H = - 284.5 kJ/kg. mole. The heat of formation of CO is __________ kJ/kg. mole. |
| A. | -109.5 |
| B. | +109.5 |
| C. | +180 |
| D. | +100 |
| Answer» B. +109.5 | |
| 5321. |
Osmotic pressure of the solution can be increased by |
| A. | decreasing its temperature. |
| B. | increasing the volume of the vessel containing the solution. |
| C. | diluting the solution. |
| D. | none of these. |
| Answer» E. | |
| 5322. |
The crystallisation of a solute from a solution may be done by |
| A. | removal of pure solvent by evaporation. |
| B. | change of temperature thereby causing supersaturation. |
| C. | changing the nature of the system by the addition of a more soluble material. |
| D. | all (a), (b) &(c). |
| Answer» E. | |
| 5323. |
A chemical process is said to occur under unsteady state, if the |
| A. | inventory changes do not take place. |
| B. | ratio of streams entering/leaving are independent of time. |
| C. | flow rates & composition both are time dependent. |
| D. | none of these. |
| Answer» D. none of these. | |
| 5324. |
1 centipoise is equivalent to |
| A. | 1 gm/cm.second |
| B. | 1 centistoke |
| C. | 2.42 lb/ft.hr |
| D. | 2.42 lb/ft.second |
| Answer» D. 2.42 lb/ft.second | |
| 5325. |
Assume that benzene is insoluble in water. The normal boiling points of benzene and water are 80.1 and 100 C respectively. At a pressure of 1 atm, the boiling point of a mixture of benzene and water is |
| A. | 80.1 C. |
| B. | less than 80.1 C. |
| C. | 100 C. |
| D. | greater than 80.1 C but less than 100 C. |
| Answer» E. | |
| 5326. |
The value of gas constant 'R' is __________ kcal/kg.mole. C. |
| A. | 2.79 |
| B. | 1.987 |
| C. | 3.99 |
| D. | none of these |
| Answer» E. | |
| 5327. |
Diffusion is that property by virtue of which a perfume bottle when opened up in a room, makes the whole room fragrant with its smell. If a perfume 'X' diffuses twice as fast as another perfume 'Y'; what is the molecular weight of 'Y', if the vapor density of gas 'X' is 2 ? Molecular weight of gas 'X' is to be assumed to be 2. |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 16 |
| Answer» E. | |
| 5328. |
The latent heat of vaporisation |
| A. | decreases with increased temperature. |
| B. | decreases as pressure increases |
| C. | becomes zero at the critical point. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 5329. |
Needle valves are generally not used for |
| A. | very large diameter pipes. |
| B. | high pressure throttling service. |
| C. | very accurate flow control. |
| D. | smaller sizes of pipe. |
| Answer» B. high pressure throttling service. | |
| 5330. |
Height equivalent to a theoretical plate (HETP) is the height of packing that will give the same separation as one theoretical plate in gas-liquid mass transfer operations like distillation, absorption/stripping and humidification/dehumidification. HETP which is experimentally determined, depends upon the |
| A. | flow rates of each fluid. |
| B. | type and size of packing. |
| C. | concentration of each fluid. |
| D. | all a, b & c. |
| Answer» E. | |
| 5331. |
With increase in gas flow rate to fabric surface area ratio (Nm3/hr/m2 fabric surface area), the size & the cost of a bag filter |
| A. | increases |
| B. | decreases |
| C. | remain unaffected |
| D. | none of these |
| Answer» C. remain unaffected | |
| 5332. |
A head comprises of straight flange section, corner torus, section and central dished section. Crown radius and knuckle radius in a head is related respectively to the |
| A. | central dished section and corner torus section. |
| B. | corner torus section and central dished section. |
| C. | central dished section and straight flange section. |
| D. | straight flange section and corner torus section. |
| Answer» B. corner torus section and central dished section. | |
| 5333. |
Colligative properties of a dilute solution are those which depend entirely upon the |
| A. | constitution of the solute. |
| B. | chemical composition of the solute. |
| C. | number of solute molecules contained in a given volume of the solvent. |
| D. | none of these. |
| Answer» B. chemical composition of the solute. | |
| 5334. |
For an ideal solution, the total vapor pressure varies __________ with the composition(expressed as mole fraction). |
| A. | inversely |
| B. | exponentially |
| C. | linearly |
| D. | negligibly |
| Answer» D. negligibly | |
| 5335. |
Measurement of the amount of dry gas collected over water from volume of moist gas is based on the |
| A. | Charle's law. |
| B. | Dalton's law of partial pressures. |
| C. | Avogadro's hypothesis. |
| D. | Boyle's law. |
| Answer» C. Avogadro's hypothesis. | |
| 5336. |
In physical adsorption, as compared to chemisorption, the |
| A. | quantity adsorbed per unit mass is higher. |
| B. | rate of adsorption is controlled by the resistance to surface reaction. |
| C. | activation energy is very high. |
| D. | heat of adsorption is very large. |
| Answer» B. rate of adsorption is controlled by the resistance to surface reaction. | |
| 5337. |
Number of gm moles of solute dissolved in 1 kg of solvent is called its |
| A. | normality |
| B. | molarity |
| C. | molality |
| D. | formality |
| Answer» D. formality | |
| 5338. |
Size range of the colloidals particles is |
| A. | 5 - 200 milli-microns |
| B. | 50 - 200 microns |
| C. | 500 - 1000 microns |
| D. | 10 - 50 Angstrom |
| Answer» B. 50 - 200 microns | |
| 5339. |
Unrestrained expansion of an ideal gas does not result in its cooling due to the reason that the gas molecules |
| A. | do not lose energy on collision. |
| B. | are above the inversion temperature. |
| C. | do not exert attractive force on each other. |
| D. | do work equal to loss in kinetic energy. |
| Answer» D. do work equal to loss in kinetic energy. | |
| 5340. |
pH value of a solution containing 1 gm of hydrogen ion per litre will be |
| A. | 0 |
| B. | 1 |
| C. | 7 |
| D. | 10 |
| Answer» B. 1 | |
| 5341. |
For most salts, the solubility increases with rise in temperature, but the solubility of __________ is nearly independent of temperature rise. |
| A. | sodium chloride |
| B. | sodium carbonate monohydrate |
| C. | anhydrous sodium sulphate |
| D. | hypo |
| Answer» B. sodium carbonate monohydrate | |
| 5342. |
The molecules of a liquid which is in equilibrium with its vapor at its boiling point on an average have equal __________ in the two phases. |
| A. | potential energy |
| B. | intermolecular forces |
| C. | kinetic energy |
| D. | total energy |
| Answer» D. total energy | |
| 5343. |
If a solution of eutectic composition is cooled, __________ reaching the eutectic temperature. |
| A. | the solvent begins to freeze out even before |
| B. | it will undergo no change until |
| C. | it will not solidify even on |
| D. | none of these |
| Answer» C. it will not solidify even on | |
| 5344. |
In a chemical process, the recycle stream is purged for |
| A. | increasing the product yield. |
| B. | enriching the product. |
| C. | limiting the inerts. |
| D. | heat conservation. |
| Answer» D. heat conservation. | |
| 5345. |
The viscosity of water at room temperature may be around one |
| A. | centipoise |
| B. | poise |
| C. | stoke |
| D. | both (b) &(c) |
| Answer» B. poise | |
| 5346. |
A flowsheet is given in the following figure: If the single pass once through conversion of A to B is 20%, then the rate of recycle R (molds/hr) is |
| A. | 300 |
| B. | 400 |
| C. | 500 |
| D. | 600 |
| Answer» D. 600 | |
| 5347. |
The heat capacity of most substances is greater for the __________ state. |
| A. | solid |
| B. | liquid |
| C. | gaseous |
| D. | none of these |
| Answer» C. gaseous | |
| 5348. |
The temperature at which real gases obey the ideal gas law over a wide range of pressure is called the __________ temperature. |
| A. | reduced |
| B. | Boyle |
| C. | critical |
| D. | inversion |
| Answer» E. | |
| 5349. |
Assuming applicability of ideal gas law, the pure component volume of the vapor in a saturated gas can be calculated from theoretical relationship. The volumetric composition of a vapor saturated gas is independent of the |
| A. | nature of the liquid. |
| B. | nature of the gas. |
| C. | temperature of the liquid. id) total pressure. |
| Answer» C. temperature of the liquid. id) total pressure. | |
| 5350. |
Air at a temperature of 20 C and 750 mm Hg pressure has a relative humidity of 80%. What is its percentage humidity ? Vapour pressure of water at 20 C is 17.5 mm Hg. |
| A. | 80.38 |
| B. | 80 |
| C. | 79.62 |
| D. | 78.51 |
| Answer» D. 78.51 | |