MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Hydrogen in liquid steels is dissolved |
| A. | as tiny gas bubbles. |
| B. | in the atomic form. |
| C. | in the ionic form. |
| D. | in the molecular form. |
| Answer» B. in the atomic form. | |
| 2. |
Eutectoid composition of carbon steel at room temperature is |
| A. | cementite |
| B. | pearlite |
| C. | martensite |
| D. | ferrite |
| Answer» C. martensite | |
| 3. |
Heat release during phase change is observed in case of a/an |
| A. | boiler |
| B. | condenser |
| C. | evaporator |
| D. | all (a), (b) & (c) |
| Answer» C. evaporator | |
| 4. |
The maximum value, which the residual stress in a material can reach is the __________ of the material. |
| A. | elastic limit |
| B. | plastic limit |
| C. | yield stress |
| D. | breaking stress |
| Answer» B. plastic limit | |
| 5. |
Water hammer is caused in steam carrying pipelines, because of |
| A. | partial condensation of steam. |
| B. | vibration of the pipeline. |
| C. | high degree of superheat of steam. |
| D. | its exposure to torrential rain. |
| Answer» B. vibration of the pipeline. | |
| 6. |
Tesla metre per ampere (T. m/A) is the unit for the measurement of |
| A. | magnetic succeptibility. |
| B. | magnetic moment. |
| C. | permeability of free space. |
| D. | flux density. |
| Answer» D. flux density. | |
| 7. |
Pellets are not as popular a burden as sinter in the iron blast furnace, because of their |
| A. | shape. |
| B. | swelling tendency. |
| C. | poor reducibility. |
| D. | low mechanical strength. |
| Answer» C. poor reducibility. | |
| 8. |
Volute casing of a centrifugal pump does not facilitate |
| A. | uniform flow of fluid coming out of the impeller. |
| B. | increase in the pump efficiency. |
| C. | conversion of the part of the velocity head to the pressure head. |
| D. | conversion of the part of the pressure head to velocity head. |
| Answer» E. | |
| 9. |
While the oxy-acetylene flame produces a temperature of 3200°C, the temperature produced by oxy-hydrogen flame is about __________ °C.$ |
| A. | 1800 |
| B. | 2000 |
| C. | 2400 |
| D. | 3000 |
| Answer» C. 2400 | |
| 10. |
There are one octahedral void and __________ tetrahedral void in the closest packing of atoms. |
| A. | one |
| B. | two |
| C. | three |
| D. | none of these |
| Answer» C. three | |
| 11. |
Euler number is defined as the ratio of inertia force to __________ force. |
| A. | pressure |
| B. | elastic |
| C. | gravity |
| D. | viscous |
| Answer» B. elastic | |
| 12. |
The velocity at which individual particles from a fluidised bed are carried away by the fluid passing through it, is defined as the |
| A. | minimum fluidisation velocity. |
| B. | terminal velocity. |
| C. | elutriation velocity. |
| D. | superficial velocity. |
| Answer» D. superficial velocity. | |
| 13. |
Machinability of hard alloys & tool steels is improved by |
| A. | spherodising |
| B. | annealing |
| C. | tempering |
| D. | normalising |
| Answer» C. tempering | |
| 14. |
Percentage of argon (by volume) in dry atmospheric air is about |
| A. | 0.09 |
| B. | 0.3 |
| C. | 0.57 |
| D. | 0.94 |
| Answer» E. | |
| 15. |
Steam condenser tubes are made of ad-mirability brass, in which percentage of zinc & copper are __________ respectively. |
| A. | 70 & 30 |
| B. | 30 & 70 |
| C. | 50 & 50 |
| D. | 90 & 10 |
| Answer» B. 30 & 70 | |
| 16. |
Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles (i.e., froth), which will hold the ore particles, but it does not affect the floatability of minerals. Which of the following is not used as a frother? |
| A. | Cresylic acid |
| B. | Xanthaies |
| C. | Pine oil |
| D. | all 'a' 'b' & 'c' |
| Answer» C. Pine oil | |
| 17. |
Between 230 and 370°C, blue brittleness is caused in mild steel because of the$ |
| A. | immobility of dislocation. |
| B. | strain-ageing. |
| C. | increase in Young's modulus. |
| D. | strain hardening. |
| Answer» C. increase in Young's modulus. | |
| 18. |
Cementite is in the lamellar form in the __________ phase of steel. |
| A. | martensitic |
| B. | bainitic |
| C. | pearlitic |
| D. | ferritic |
| Answer» D. ferritic | |
| 19. |
Magnesium is present in |
| A. | haemoglobin |
| B. | chlorophyll |
| C. | hypo solution |
| D. | none of these |
| Answer» C. hypo solution | |
| 20. |
In case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean temperature difference) for counter flow as compared to that for parallel flow is |
| A. | more |
| B. | less |
| C. | equal |
| D. | much more |
| Answer» D. much more | |
| 21. |
The critical pressure at which the latent heat of vaporisation of steam becomes zero is __________ Kg/cm2 . |
| A. | 273.15 |
| B. | 225.65 |
| C. | 100.03 |
| D. | 373.15 |
| Answer» C. 100.03 | |
| 22. |
Which of the following does not lower the surface tension of liquids ? |
| A. | Fat |
| B. | Soap |
| C. | Detergent |
| D. | Surfactant |
| Answer» B. Soap | |
| 23. |
Heat dissipation in cooling towers is mainly by |
| A. | conduction |
| B. | convection |
| C. | evaporation |
| D. | radiation |
| Answer» D. radiation | |
| 24. |
'Amortization' in respect of financial obligation of a company means the |
| A. | liquidation of financial obligations on instalment basis. |
| B. | commitment of financial obligation on priority. |
| C. | liquidation of all the obsolete equipments of the company. |
| D. | modernisation of the plant equipments. |
| Answer» B. commitment of financial obligation on priority. | |
| 25. |
What is the pH of distilled water ? |
| A. | 0 |
| B. | 1 |
| C. | 7 |
| D. | 14 |
| Answer» D. 14 | |
| 26. |
Springs are not made of |
| A. | phospher bronze. |
| B. | nickel steel. |
| C. | monel. |
| D. | carbon steel (c ≤ 0.5%). |
| Answer» E. | |
| 27. |
In an eutectic system, two elements are completely |
| A. | soluble in solid state. |
| B. | insoluble in liquid state. |
| C. | insoluble in both solid & liquid state. |
| D. | soluble in liquid state. |
| Answer» E. | |
| 28. |
Source of heat supply in a cupola is |
| A. | coke |
| B. | charcoal |
| C. | lumpy coal |
| D. | pulverised coal |
| Answer» B. charcoal | |
| 29. |
Projection welding & stud welding is categorised as the __________ welding. |
| A. | pressure |
| B. | thermit |
| C. | resistance |
| D. | arc |
| Answer» D. arc | |
| 30. |
Which of the following is the most effective inhibitor of grain growth, when added in small quantity in steel ? |
| A. | Manganese |
| B. | Vanadium |
| C. | Cobalt |
| D. | Copper |
| Answer» C. Cobalt | |
| 31. |
Pick out the wrong statement. Termination of polymerisation reaction occurs, if the |
| A. | catalyst supply is stopped. |
| B. | monomer supply is exhausted. |
| C. | impurities present in monomers interfere with the chemical reaction. |
| D. | two ends of a chain of molecules join. |
| Answer» B. monomer supply is exhausted. | |
| 32. |
FeO (s) + CO (g) = Fe (s) + CO2 (g), k = 0. 435 at 1173E; At equilibrium, what will be the number of moles of CO gas required to reduce one mole of FeO at 1173 K? |
| A. | 1 |
| B. | 1.3 |
| C. | 2.3 |
| D. | 3.3 |
| Answer» E. | |
| 33. |
Hot extrusion process is not used for making |
| A. | cast iron pipe for domestic water supply. |
| B. | aluminium curtain rods. |
| C. | stainless steel tubes used in furnitures. |
| D. | any of these. |
| Answer» B. aluminium curtain rods. | |
| 34. |
Function of gear box is to |
| A. | reduce the speed. |
| B. | obtain variable speed. |
| C. | increase the speed. |
| D. | produce high torque. |
| Answer» C. increase the speed. | |
| 35. |
Circular cross section machine parts which are symmetrical about the axis of rotation are made by hot |
| A. | piercing |
| B. | spinning |
| C. | drawing |
| D. | extrusion |
| Answer» C. drawing | |
| 36. |
Temperature attained in soldering of metals is about __________ °C.$ |
| A. | 150-300 |
| B. | 400-500 |
| C. | 650-800 |
| D. | 1000-1100 |
| Answer» B. 400-500 | |
| 37. |
Pick out the wrong conversion of absolute & kinematic viscosities. |
| A. | 1 stoke = 1 cm2/sec. |
| B. | 1 N.sec/m2 = 10 paise. |
| C. | 1 stoke = 1 m2/sec. |
| D. | 1 m2/sec = 104 stokes. |
| Answer» D. 1 m2/sec = 104 stokes. | |
| 38. |
With increasing carbon percent in steel beyond 0.8%, its ultimate tensile strength (UTS) and __________ is not affected. |
| A. | impact strength |
| B. | percent elongation |
| C. | hardness |
| D. | both 'b' & 'c' |
| Answer» B. percent elongation | |
| 39. |
Stresses encountered in the metal forming processes are less than the __________ of the material. |
| A. | fracture strength |
| B. | yield strength |
| C. | elastic limit |
| D. | limit of proportionality |
| Answer» B. yield strength | |
| 40. |
__________ addition increases the depth of hardness of steel. |
| A. | Chromium |
| B. | Nickel |
| C. | Tungsten |
| D. | Vanadium |
| Answer» B. Nickel | |
| 41. |
A common disinfectant used in village wells for disinfection of water is |
| A. | free chlorine |
| B. | bromine |
| C. | iodine |
| D. | potassium permanganate |
| Answer» E. | |
| 42. |
In a totally irreversible isothermal expansion process for an ideal gas, ΔE = 0, ΔH = 0. Then ΔQ and ΔS will be$ |
| A. | ΔQ = 0, ΔS=0 |
| B. | ΔQ = 0 , ΔS = +ve |
| C. | ΔQ = 0, ΔS = -ve |
| D. | ΔQ = +ve , ΔS= +ve |
| Answer» C. ŒîQ = 0, ŒîS = -ve | |
| 43. |
Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity) |
| A. | 1/k |
| B. | k |
| C. | k2 |
| D. | 1/k2 |
| Answer» C. k2 | |
| 44. |
An approximately __________ process exemplifies the flow of a gas through a very long pipe of uniform cross-section. |
| A. | adiabatic |
| B. | isothermal |
| C. | isentropic |
| D. | isochoric |
| Answer» C. isentropic | |
| 45. |
In continuous casting of liquid steel, the mould is made of |
| A. | water cooled steel |
| B. | water cooled copper. |
| C. | refractory oxide. |
| D. | silicon carbide. |
| Answer» C. refractory oxide. | |
| 46. |
Transition from laminar flow to turbulent flow in fluid flow through a pipe does not depend upon the |
| A. | length of the pipe. |
| B. | diameter of the pipe. |
| C. | density of the fluid. |
| D. | velocity of the fluid. |
| Answer» B. diameter of the pipe. | |
| 47. |
Metals in general have a low value of thermal |
| A. | conductivity |
| B. | diffusivity |
| C. | inertia |
| D. | all (a), (b) & (c) |
| Answer» D. all (a), (b) & (c) | |
| 48. |
Which of the following is an inedible oil ? |
| A. | Corn oil |
| B. | Tallow oil |
| C. | Olive oil |
| D. | Cotton seed oil |
| Answer» C. Olive oil | |
| 49. |
Hydrocyclone is a |
| A. | crusher |
| B. | wet classifier |
| C. | dry classifier |
| D. | magnetic separator |
| Answer» C. dry classifier | |
| 50. |
Often earing defects are found during deep drawing operation, because the |
| A. | surface finish of the sheet is poor. |
| B. | sheet material has been given substantial spring back. |
| C. | starting sheet has planer anisotropy due to its texture. |
| D. | starting sheet has normal anitropy due to its texture. |
| Answer» D. starting sheet has normal anitropy due to its texture. | |