MCQOPTIONS
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MCQOPTIONS
This section includes 689 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 401. |
The unit of specific heat at constant pressure, Cp, in SI unit is |
| A. | W/m2°C |
| B. | J/kg°K |
| C. | W/m°K |
| D. | J/m3°K |
| Answer» C. W/m¬∞K | |
| 402. |
The osmotic pressure of a solution increases, if its __________ is decreased. |
| A. | volume |
| B. | solute concentration |
| C. | temperature |
| D. | none of these |
| Answer» E. | |
| 403. |
For the gaseous phase reaction, N2 + O22NO, ΔH = + 80 kJ/kg. mole; the decomposition of NO is favoured by$ |
| A. | increasing the concentration of N2. |
| B. | decrease in temperature. |
| C. | increase in pressure. |
| D. | decrease in pressure. |
| Answer» C. increase in pressure. | |
| 404. |
Pick out the wrong statement about the recycle stream in a process. |
| A. | Recycling in a process stream helps in utilising the valuable reactants to the maximum with minimum loss of reactants. |
| B. | The ratio of the quantity of a reactant present in the reactor feed of a recycling operation to the quantity of the same reactant entering the process as fresh feed is called combined feed ratio. |
| C. | Recycling in a process does not help in getting higher extent of reaction. |
| D. | Recycling is exemplified by refluxing back a part of the distillate to the distillation column to maintain the quantity of liquid within the column. |
| Answer» D. Recycling is exemplified by refluxing back a part of the distillate to the distillation column to maintain the quantity of liquid within the column. | |
| 405. |
For an ideal gas, the compressibility factor |
| A. | decreases with pressure rise. |
| B. | is unity at all temperature. |
| C. | is unity at Boyle's temperature. |
| D. | zero. |
| Answer» C. is unity at Boyle's temperature. | |
| 406. |
Claussius Clapeyron equation applies to the __________ process. |
| A. | sublimation |
| B. | melting |
| C. | vaporisation |
| D. | all (a), (b) & (c) |
| Answer» E. | |
| 407. |
__________ equation relates latent heat and boiling point. |
| A. | Antonie |
| B. | Kistyakowsky |
| C. | Kopp's |
| D. | Trouton's |
| Answer» E. | |
| 408. |
The equilibria relations in a multicom-ponent and multiphase system can not be calculated with the help of the |
| A. | phase rule |
| B. | experimental data |
| C. | emperical equations |
| D. | theoretical equations |
| Answer» B. experimental data | |
| 409. |
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 | |
| 410. |
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 | |
| 411. |
The quantity of heat required to evaporate 1 kg of a saturated liquid is called |
| A. | specific heat |
| B. | 1 Kcal |
| C. | sensible heat |
| D. | latent heat |
| Answer» E. | |
| 412. |
The osmotic pressure of a solution is directly proportional to the |
| A. | lowering of vapor pressure. |
| B. | molecular concentration of the solute. |
| C. | absolute temperature of a given concentration. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 413. |
1m3 is approximately equal to |
| A. | 28 litres |
| B. | 35 ft3 |
| C. | 4.5 litres |
| D. | 4.5 ft3 |
| Answer» C. 4.5 litres | |
| 414. |
Methane is mixed with stoichiometric proportion of oxygen and completely combusted. The number of additional specifications required to determine the product flow rate and composition is |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |
| 415. |
At higher temperatures, molal heat capacities for most of the gases (at constant pressure) __________ with increase in temperature. |
| A. | varies linearly |
| B. | increases |
| C. | decreases |
| D. | does not vary |
| Answer» C. decreases | |
| 416. |
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) | |
| 417. |
With increase in the temperature of pure (distilled) water, its |
| A. | pOH decreases and pH increases. |
| B. | pOH and pH both 4ecreases. |
| C. | pH and pOH both increases. |
| D. | pH decreases and pOH increases. |
| Answer» C. pH and pOH both increases. | |
| 418. |
Boiling point of a solution as compared to that of the corresponding solvent is |
| A. | less |
| B. | more |
| C. | same |
| D. | either more or less; depends upon the solvent |
| Answer» C. same | |
| 419. |
A gas occupies a volume of 283 c.c at 10°C. If it is heated to 20°C at constant pressure, the new volume of the gas will be __________ c.c.$ |
| A. | 283 |
| B. | 566 |
| C. | 293 |
| D. | 141.5 |
| Answer» D. 141.5 | |
| 420. |
Kopp's rule is useful for the determination of |
| A. | molal heat capacities of gases. |
| B. | heat capacities of solids. |
| C. | activation energy. |
| D. | heat capacities of gases. |
| Answer» C. activation energy. | |
| 421. |
Pick out the wrong unit conversion of mass transfer co-efficient. |
| A. | 1 lb/hr.ft3.atm. = 4.8182 kg/hr.m2.bar |
| B. | 1 kg/hr.m2.atm= 0.98687 kg/hr. m .bar |
| C. | 1 lb/hr . ft2 = 4.8823 kg/hr . m2 |
| D. | 1 kg/hr . m2 = 4.8823 lb/hr . ft2 |
| Answer» E. | |
| 422. |
If the pH value of a solution changes by one unit, it implies that hydrogen ion concentration in the solution will change __________ times. |
| A. | 10 |
| B. | 20 |
| C. | 70 |
| D. | 100 |
| Answer» B. 20 | |
| 423. |
Heat of __________ of a fuel is called its calorific value. |
| A. | formation |
| B. | combustion |
| C. | reaction |
| D. | vaporisation |
| Answer» C. reaction | |
| 424. |
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 | |
| 425. |
1 ata is equivalent to |
| A. | 1 atm. |
| B. | 10 torr |
| C. | 0.98 Pascal |
| D. | 1 kgf/cm2 |
| Answer» E. | |
| 426. |
'Cox' chart which is useful in the design of a distillation column (particularly suitable for petroleum hydrocarbons) is a plot of the |
| A. | temperature vs. log (vapor pressure). |
| B. | vapor pressure vs. log (temperature). |
| C. | log (temperature) vs. log (vapor pressure). |
| D. | vapor pressure vs. temperature. |
| Answer» B. vapor pressure vs. log (temperature). | |
| 427. |
The molecular velocity of a real gas is proportional to (where, T = absolute temperature of the gas). |
| A. | T |
| B. | T |
| C. | T2 |
| D. | 1/T |
| Answer» B. T | |
| 428. |
A saturated vapor on being compressed would |
| A. | condense |
| B. | form wet steam |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 429. |
The density of a liquid is 1500 kg/m3. Its value in gin/litre will be equal to |
| A. | 1.5 |
| B. | 15 |
| C. | 150 |
| D. | 1500 |
| Answer» E. | |
| 430. |
According to the kinetic theory, the thermal conductivity of a monoatomic gas is proportional to |
| A. | T |
| B. | T0.5 |
| C. | T1.5 |
| D. | T2 |
| Answer» C. T1.5 | |
| 431. |
"The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface". This statement pertaining to the solubility of gases in liquid is the __________ law. |
| A. | Raoult's |
| B. | Henry's |
| C. | Amgat's |
| D. | none of these |
| Answer» C. Amgat's | |
| 432. |
__________ kg of CaC03 on heating will give 56 kg of CaO. |
| A. | 56 . |
| B. | 100 |
| C. | 144 |
| D. | 1000 |
| Answer» C. 144 | |
| 433. |
A gas mixture contains 6 moles of H2 and 2 moles of N2. If the total pressure of the gaseous mixture is 4 kgf/cm2 ; then the partial pressure of N2 in the mixture will be __________ kgf/cm2 . |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 8 |
| Answer» B. 2 | |
| 434. |
Atomic __________ of an element is a whole number. |
| A. | weight |
| B. | number |
| C. | volume |
| D. | radius |
| Answer» C. volume | |
| 435. |
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 | |
| 436. |
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 | |
| 437. |
In the reaction, Ca + 2H2O = Ca(OH)2 + H2 ; what volume (c.c.) of hydrogen at STP would be liberated, when 8 gm of calcium reacts with excess water ? (atomic weight of calcium = 40) |
| A. | 4480 |
| B. | 2240 |
| C. | 1120 |
| D. | 0.4 |
| Answer» B. 2240 | |
| 438. |
Osmotic pressure exerted by a solution prepared by dissolving one gram mole of a solute in 22.4 litres of a solvent at 0°C will be __________ atmosphere.$ |
| A. | 0.5 |
| B. | 1 |
| C. | 1.5 |
| D. | 2 |
| Answer» C. 1.5 | |
| 439. |
Saturated molal absolute humidity of the vapor-gas mixture depends upon the |
| A. | vapor pressure at dry bulb temperature |
| B. | total pressure |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 440. |
The atomic weight of helium is 4 times that of hydrogen. Its diffusion rate as compared to hydrogen will be __________ times. |
| A. | 43497 |
| B. | 4 |
| C. | 2 |
| D. | 43556 |
| Answer» D. 43556 | |
| 441. |
The vapor pressures of benzene and toluene are 3 and 4/3 atmospheres respectively. A liquid feed of 0.4 moles of benzene and 0.6 moles of toluene is vapourised. Assuming that the products are in equilibrium, the vapor phase mole fraction of benzene is |
| A. | 0.4 |
| B. | 0.6 |
| C. | 0.8 |
| D. | 0.2 |
| Answer» C. 0.8 | |
| 442. |
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. | |
| 443. |
Heat of neutralisation of a strong acid and strong base is always a constant value, i.e., 57 KJ/Kg mole. This is because |
| A. | the strong base and strong acid reacts completely. |
| B. | the salt formed does not hydrolyse. |
| C. | only OH- and H+ ions react in every case. |
| D. | the strong base and strong acid reacts in aqueous solution. |
| Answer» D. the strong base and strong acid reacts in aqueous solution. | |
| 444. |
Avogadro's number is equal to |
| A. | 6.023 x 1023 molecules/kg.mole. |
| B. | 6.023 x 1023 molecules/gm.mole. |
| C. | 6.023 x 1016 molecules/kg.mole. |
| D. | 6.023 x 1026 molecules/gm.mole. |
| Answer» C. 6.023 x 1016 molecules/kg.mole. | |
| 445. |
Which of the following is not used for computing latent heat of vaporisation ? |
| A. | Clausius-Clayperon equation |
| B. | Reference substance plots based on Durhing & Othmer plots |
| C. | Kistyakowasky's equation |
| D. | Hess's law of constant heat summation |
| Answer» E. | |
| 446. |
The heat capacity of most substances is greater for the __________ state. |
| A. | solid |
| B. | liquid |
| C. | gaseous |
| D. | none of these |
| Answer» C. gaseous | |
| 447. |
The density of a gas at N.T.P.is 'ρ'. Keeping the pressure constant (i.e. 760 mm Hg), the 3 density of the gas will become at a temperature of __________ °K$ |
| A. | 273° |
| B. | 300° |
| C. | 400° |
| D. | 300° |
| Answer» D. 300¬∞ | |
| 448. |
The gravimetric (i.e., by weight) composition of a vapor saturated gas is independent of the |
| A. | nature of both the gas & the liquid. |
| B. | temperature. |
| C. | total pressure. |
| D. | none of these. |
| Answer» E. | |
| 449. |
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 | |
| 450. |
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 | |