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MCQOPTIONS
This section includes 5314 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1651. |
Calculate the pKa of lactic acid, given that when the concentration of lactic acid is 0.010M and the concentration of lactate is 0.087M, the pH is 4.80. |
| A. | 4 |
| B. | 3.9 |
| C. | 3.3 |
| D. | 4.1 |
| Answer» C. 3.3 | |
| 1652. |
Calculate the pH of a mixture of 0.10M acetic acid and 0.20M sodium acetate. The pKa of acetic acid is 4.76. |
| A. | 5.1 |
| B. | 4.1 |
| C. | 6.1 |
| D. | 7.1 |
| Answer» B. 4.1 | |
| 1653. |
Which can act as buffer? |
| A. | NH4 Cl + HCl |
| B. | CH3 COOH + H2 CO3 |
| C. | 40ml of 0.1M NaCN + 20ml of 0.1M HCN |
| D. | NaCl + NaOH |
| Answer» D. NaCl + NaOH | |
| 1654. |
Smaller relative atomic displacements are required for a motion of a narrow dislocation. |
| A. | True |
| B. | False |
| Answer» C. | |
| 1655. |
A width of dislocation is dependent on temperature. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 1656. |
Ionic solids have _____ dislocation width and _____ frictional stress. |
| A. | Wide, very small |
| B. | Wide, moderate |
| C. | Narrow, moderate |
| D. | Narrow, large |
| Answer» D. Narrow, large | |
| 1657. |
BCC metals (transition metals) have _____ yield strength temperature sensitivity. |
| A. | No |
| B. | Small |
| C. | Large |
| D. | Moderate |
| Answer» D. Moderate | |
| 1658. |
Covalent solids have ____ width dislocations. |
| A. | Wide |
| B. | Narrow |
| C. | Moderate |
| D. | Very narrow |
| Answer» E. | |
| 1659. |
Identify the type of dislocation? |
| A. | Wide |
| B. | Narrow |
| C. | Screw |
| D. | Frank partial |
| Answer» C. Screw | |
| 1660. |
What is P-N stress for a dislocation of width 10b? |
| A. | 0 |
| B. | G |
| C. | G/400 |
| D. | G/1027 |
| Answer» E. | |
| 1661. |
Which factor doesn’t affect P-N stress? |
| A. | Periodicity of atoms |
| B. | Dislocation width |
| C. | Crystal structure |
| D. | Applied stress |
| Answer» E. | |
| 1662. |
Zero voltage regulation of a transformer is achieved at 1 pf leading. |
| A. | True |
| B. | False |
| Answer» C. | |
| 1663. |
What is the correct formula to get power factor angle in lagging condition? |
| A. | sin φ= X/R |
| B. | tan φ= R/X |
| C. | cos φ = R/√(R2+X2) |
| D. | cos φ= R/X |
| Answer» D. cos φ= R/X | |
| 1664. |
Which is the correct phasor equation indicating the transformer voltages leading? |
| A. | V1 = V2 + I*(R cosφ- X sinφ) |
| B. | V2 = V1 + I*(R cosφ- X sinφ) |
| C. | V1 = V2 + I*(X cosφ- X sinφ) |
| D. | V1 = V2 + I*(R cosφ- R sinφ) |
| Answer» B. V2 = V1 + I*(R cosφ- X sinφ) | |
| 1665. |
Voltage regulation of transformer is given by _____________ |
| A. | E2-V2/V2 |
| B. | E2-V2/E2 |
| C. | V2-E2/E2 |
| D. | V2-E2/V2 |
| Answer» C. V2-E2/E2 | |
| 1666. |
Which of the following MySQL statements is valid if ‘`sampledb`’ is a database and ‘`tbl`’ is a table in it? |
| A. | SELECT * FROM `sampledb.member` |
| B. | SELECT * FROM `sampledb`.`member` |
| C. | SELECT * FROM `member`.`sampledb` |
| D. | SELECT * FROM `member.sampledb` |
| Answer» C. SELECT * FROM `member`.`sampledb` | |
| 1667. |
If no database has been selected, specifying a database qualifier is necessary. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 1668. |
Which of the following characters is illegal in naming an unquoted identifier in SQL? |
| A. | _ |
| B. | $ |
| C. | 2 |
| D. | . |
| Answer» E. | |
| 1669. |
A liquid phase has to be used in cold welding. |
| A. | True |
| B. | False |
| Answer» C. | |
| 1670. |
Which of the following could be considered as a related process? |
| A. | Explosive |
| B. | Oxy-Hydrogen welding |
| C. | Oxy-Acetylene cutting |
| D. | Electron-beam |
| Answer» D. Electron-beam | |
| 1671. |
Which of the following is not a type of arc welding? |
| A. | Plasma |
| B. | Electro-slag |
| C. | Submerged |
| D. | Air-acetylene |
| Answer» E. | |
| 1672. |
While rolling, material near the edges experience compression. |
| A. | True |
| B. | False |
| Answer» C. | |
| 1673. |
The following figure represents which defect? |
| A. | Alligatoring |
| B. | Zipper cracks |
| C. | Folds |
| D. | Laminations |
| Answer» C. Folds | |
| 1674. |
Which of the following defect occurs because of the bending of rolls? |
| A. | Zipper cracks |
| B. | Folds |
| C. | Laminations |
| D. | Alligatoring |
| Answer» B. Folds | |
| 1675. |
Which of the following cannot be regarded as a defect in rolled parts? |
| A. | Inhomogeneous deformation |
| B. | Surface defect |
| C. | External cracking defect |
| D. | Internal structure defect |
| Answer» D. Internal structure defect | |
| 1676. |
A composite bar consists of a bar enclosed inside a tune of another material when compressed under a load as whole through rigid collars at the end of the bar. What will be the equation of compatibility? |
| A. | W1 + W2 = W |
| B. | W1 + W2 = constant |
| C. | W1/A1E1 = W2/A2E2 |
| D. | W1/A1E2 = W2/A2E1 |
| Answer» B. W1 + W2 = constant | |
| 1677. |
A bar shown in the diagram below is subjected to load 160kN. If the stress in the middle portion Is limited to 150N/mm2, what will be the length of the middle portion, if the total elongation of the bar is to be 0.2mm? Take E = 2.1 x 105 N/mm2. |
| A. | 18.45cm |
| B. | 17.24cm |
| C. | 16.45cm |
| D. | 20.71cm |
| Answer» E. | |
| 1678. |
A round bar made of same material consists of 4 parts each of 100mm length having diameters of 40mm, 50mm, 60mm and 70mm, respectively. If the bar is subjected to an axial load of 10kN, what will be the total elongation of the bar in mm? |
| A. | 0.4/πE ( 1/16 + 1/25 + 1/36 + 1/49) |
| B. | 4/πE ( 1/16 + 1/25 + 1/36 + 1/49) |
| C. | 2/πE ( 1/16 + 1/25 + 1/36 + 1/49) |
| D. | 40/πE ( 1/16 + 1/25 + 1/36 + 1/49) |
| Answer» E. | |
| 1679. |
A bar is in two sections having equal lengths. The area of cross section of 1st is double that of 2nd. if the bar carries an axial load of P, then what will be the ratio of elongation in section 2nd to section 1st ? |
| A. | 1/2 |
| B. | 2 |
| C. | 4 |
| D. | 1/4 |
| Answer» C. 4 | |
| 1680. |
A rod, which tapers uniformly from 5cm diameter to 3cm diameter in a length of 50cm, is subjected to an axial load of 6000N. if E = 2,00,000 N/mm2, what will be the extension of the rod? |
| A. | 0.00114cm |
| B. | 0.00124cm |
| C. | 0.00127cm |
| D. | 0.00154cm |
| Answer» D. 0.00154cm | |
| 1681. |
A bar is subjected to a tensile load of 150kN. If the stress in the middle portion is limited to 160 N/mm2, what will be the diameter of the middle portion of the total elongation of the bar is 0.25cm (E= 2 x 105)? |
| A. | 3cm |
| B. | 3.45cm |
| C. | 3.85cm |
| D. | 4cm |
| Answer» C. 3.85cm | |
| 1682. |
A tensile rod of 40kN is acting on a rod of diameter 40mm and of length 4m. a bore of diameter 20mm is made centrally on the rod. To what length the rod should be bored so that the total extension will increase 30% under the same tensile load if E = 2×105 N/mm2? |
| A. | 2m |
| B. | 2.7m |
| C. | 3.2m |
| D. | 3.6m |
| Answer» E. | |
| 1683. |
A member ABCD is subjected to points load P1=45kN, P2, P3=450kN and P4=130kN. What will be the total elongation of the member, assuming the modulus of elasticity to be 2.1x105N/mm2. The cross sectional area is 625mm, 2500mm, 1250mm respectively. |
| A. | 0.4914mm |
| B. | 0.4235mm |
| C. | 0.4621mm |
| D. | 0.4354mm |
| Answer» B. 0.4235mm | |
| 1684. |
A member ABCD is subjected to points load P1=45kN, P2, P3=450kN and P4=130kN. what will be the value of P necessary for equilibrium? |
| A. | 350kN |
| B. | 365kN |
| C. | 375kN |
| D. | 400kN |
| Answer» C. 375kN | |
| 1685. |
In hebbian learning intial weights are set? |
| A. | random |
| B. | near to zero |
| C. | near to target value |
| D. | near to target value |
| Answer» C. near to target value | |
| 1686. |
Which of the following learning laws belongs to same category of learning? |
| A. | hebbian, perceptron |
| B. | perceptron, delta |
| C. | hebbian, widrow-hoff |
| D. | instar, outstar |
| Answer» C. hebbian, widrow-hoff | |
| 1687. |
Is outstar a case of supervised learning? |
| A. | yes |
| B. | no |
| Answer» B. no | |
| 1688. |
Correlation learning law is special case of? |
| A. | Hebb learning law |
| B. | Perceptron learning law |
| C. | Delta learning law |
| D. | LMS learning law |
| Answer» B. Perceptron learning law | |
| 1689. |
According to ______, there are six stages of sintering. |
| A. | Schroter |
| B. | Nabarro and Herring |
| C. | Kuczynsky |
| D. | Hutteg |
| Answer» E. | |
| 1690. |
The expression for the number of vacant site N is given by ________ |
| A. | N=N0\(e^{\frac{-Q}{RT}}\) |
| B. | N=N0\(e^{\frac{-Qt}{RT}}\) |
| C. | N=N0\(e^{\frac{-QT}{R}}\) |
| D. | N=N0\(e^{\frac{Q}{RT}}\) |
| Answer» B. N=N0\(e^{\frac{-Qt}{RT}}\) | |
| 1691. |
________ mechanism alters the shape of the neck and particle surface. |
| A. | Viscous flow |
| B. | Volume diffusion |
| C. | Evaporation-condensation |
| D. | Plastic flow |
| Answer» D. Plastic flow | |
| 1692. |
Which of the following mechanism does not lead to shrinkage? |
| A. | Viscous flow |
| B. | Surface diffusion |
| C. | Volume diffusion |
| D. | Grain boundary diffusion |
| Answer» C. Volume diffusion | |
| 1693. |
The empirical relationship for neck growth rate due to lattice diffusion from dislocation sources is R6= _______, |
| A. | \(\Big(\frac{4}{9}\Big)\)K2Nx2DvF(K2–\(\frac{2\epsilon x}{3\gamma_sa})\) |
| B. | \(\Big(\frac{4}{9}\Big)\)Nx2DvF(K2–\(\frac{3\epsilon x}{2\gamma_sa})\) |
| C. | \(\Big(\frac{4}{9}\Big)\)K2Nx2DvF(K2–\(\frac{3\epsilon x}{2\gamma_sa})\) |
| D. | \(\Big(\frac{4}{9}\Big)\)K2Nx2Dv(K2–\(\frac{3\epsilon x}{2\gamma_sa})\) |
| Answer» D. \(\Big(\frac{4}{9}\Big)\)K2Nx2Dv(K2–\(\frac{3\epsilon x}{2\gamma_sa})\) | |
| 1694. |
Neck growth rate due to lattice diffusion from sources on the grain boundary is R5= _______ |
| A. | 2Dv\(FK_{1}^2\) |
| B. | 2Dv\(FK_{1}^3\) |
| C. | 4Dv\(FK_{1}^2\) |
| D. | 4Dv\(FK_{2}^2\) |
| Answer» E. | |
| 1695. |
The empirical relationship for neck growth rate due to grain boundary transport from sources on the grain boundary is R4= _______ |
| A. | 4DBδB\(FK_{2}^1\)/x |
| B. | 4DBδB\(FK_{2}^1\)/x2 |
| C. | 4DBδB\(FK_{2}^1\)/a |
| D. | 4DBδB\(FK_{2}^2\)/x |
| Answer» E. | |
| 1696. |
The empirical relationship for neck growth rate due to vapor transport from the surface source is R3= _______ |
| A. | PvFK1\(\sqrt{\frac{\Omega}{2\pi \rho_{0}kT}}\) |
| B. | PvFK1\(\sqrt{\frac{\Omega}{2\pi \rho_{0}T}}\) |
| C. | PvFK1\(\sqrt{\frac{\Omega}{2\rho_{0}kT}}\) |
| D. | PvFK1\(\sqrt{\frac{\Omega T}{2\pi \rho_{0}k}}\) |
| Answer» B. PvFK1\(\sqrt{\frac{\Omega}{2\pi \rho_{0}T}}\) | |
| 1697. |
Neck growth rate due to lattice diffusion from the surface source is R2= _______ |
| A. | 2Ds\(FK_{1}^3\) |
| B. | 2Ds\(FK_{1}^2\) |
| C. | 2Dv\(FK_{1}^3\) |
| D. | 2Dv\(FK_{1}^2\) |
| Answer» E. | |
| 1698. |
Neck growth rate due to surface diffusion from the surface source is R1= _______ |
| A. | 2Dsδs\(FK_{1}^3\) |
| B. | 2Dsδs\(FK_{3}^1\) |
| C. | 2Ds\(FK_{1}^3\) |
| D. | 2Dsδs\(FK_{1}^4\) |
| Answer» B. 2Dsδs\(FK_{3}^1\) | |
| 1699. |
Which of the following transport mechanisms can occur for two spheres in contact with one another during sintering? |
| A. | Evaporation-condensation, surface diffusion and volume diffusion |
| B. | Evaporation-condensation, surface diffusion, volume diffusion, volume diffusion of vacancies, and grain boundary diffusion |
| C. | Surface diffusion |
| D. | Volume diffusion |
| Answer» C. Surface diffusion | |
| 1700. |
\(\frac{\partial(\rho\hat{u})}{\partial t}+\nabla.(\rho\vec{V}\hat{u}) = -\nabla.\dot{q_s}-p\nabla.\vec{V}-\tau:\nabla\vec{V}+\dot{q_v}\). This form of the energy equation is applicable to _________ |
| A. | Both Newtonian and non-Newtonian fluids |
| B. | Newtonian fluids |
| C. | Non-Newtonian fluids |
| D. | Pseudo-plastics |
| Answer» B. Newtonian fluids | |