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. |
Which of the following absorbs maximum heat in a high pressure boiler ? |
| A. | Economiser |
| B. | Steam superheater |
| C. | Air preheater |
| D. | Furnace water wall |
| Answer» E. | |
| 2. |
The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the __________ of the slag. |
| A. | fluidity |
| B. | basicity |
| C. | acidity |
| D. | viscosity |
| Answer» B. basicity | |
| 3. |
The thermodynamic law, PVy = constant, is not followed by the |
| A. | free expansion of an ideal gas. |
| B. | adiabatic expansion of steam in turbine. |
| C. | adiabatic compression of air. |
| D. | ideal compression of air. |
| Answer» B. adiabatic expansion of steam in turbine. | |
| 4. |
Pick out the wrong statement about the machinability of metals. Machinability of a metal |
| A. | decreases with increase in strain hardening tendencies. |
| B. | decreases with increase in hardness, in general. |
| C. | depends on the composition, microstructure and physical & mechanical properties. |
| D. | decreases with increases in tensile strength & decrease in grain size. |
| Answer» E. | |
| 5. |
Which of the following phenomenon will exhibit the minimum heat transfer? |
| A. | Boiling. |
| B. | Forced convection in air. |
| C. | Free convection in air. |
| D. | Conduction in air. |
| Answer» E. | |
| 6. |
Which of the following alloying elements when added in steel does not improve its lachinability ? |
| A. | Sulphur |
| B. | Phosphorous |
| C. | Copper |
| D. | Lead |
| Answer» D. Lead | |
| 7. |
Largest application of laser welding is in __________ welding. |
| A. | microspot |
| B. | under water |
| C. | precious metals |
| D. | heavy structure |
| Answer» B. under water | |
| 8. |
Floating control action |
| A. | moves the final control element at constant speed in either direction in response to an error signal. |
| B. | changes the position of the final control element from on to off. |
| C. | is used to counteract rapid load changes. |
| D. | none of these. |
| Answer» B. changes the position of the final control element from on to off. | |
| 9. |
Which of the following is capable of acting both as an acid flux as well as a basic flux in the metal extraction from its ore ? |
| A. | Silica |
| B. | Lime |
| C. | Alumina |
| D. | Fluorite |
| Answer» D. Fluorite | |
| 10. |
Which is the most suitable joint for the pipes, with are laid submerged under water, where the bottom of the river bed is uneven ? |
| A. | Collar joint |
| B. | Flexible joint |
| C. | Flanged joint |
| D. | Expansion joint |
| Answer» C. Flanged joint | |
| 11. |
What is the range of tempering temperature ( C) for most of the materials ? |
| A. | 75-100 |
| B. | 200-300 |
| C. | 350-450 |
| D. | 500-600 |
| Answer» C. 350-450 | |
| 12. |
Absorptivity of a grey body varies with the |
| A. | wavelength of the incident ray. |
| B. | temperature |
| C. | both'a' & 'b' |
| D. | neither 'a' nor 'b' |
| Answer» E. | |
| 13. |
Thermal expansion of solid is employed in the temperature measurement by a |
| A. | bimetallic thermometer. |
| B. | thermocouple. |
| C. | mercury thermometer. |
| D. | resistance thermometer. |
| Answer» B. thermocouple. | |
| 14. |
In radiative heat transfer, a grey surface is the one, which has |
| A. | emissivity independent of wavelength. |
| B. | grey appearance to the eye. |
| C. | zero reflectivity. |
| D. | equal brightness in all directions. |
| Answer» B. grey appearance to the eye. | |
| 15. |
Overheating of satellites during re-entry to earth is controlled by |
| A. | thick insulation. |
| B. | ceramic lining. |
| C. | cooling by flow of air over the surface. |
| D. | none of these. |
| Answer» D. none of these. | |
| 16. |
Stress and strain are related by __________ elastic constants for a linearly elastic, homogeneous & isotropic material. |
| A. | one |
| B. | two |
| C. | three |
| D. | four |
| Answer» C. three | |
| 17. |
The behaviour of a metal specimen, which when plastically strained in tension reduces its yield stress in compression and vice versa; is termed as the |
| A. | work hardening. |
| B. | Bauschinger effect. |
| C. | creeping effect. |
| D. | stress recovery effect. |
| Answer» C. creeping effect. | |
| 18. |
Function of fusible plug in a boiler is to |
| A. | drain out water and sludge from the boiler during repair. |
| B. | put off fire in the furnace when water level in the boiler falls to unsafe limit. |
| C. | guard the boiler in case of abnormal rise in steam pressure. |
| D. | all (a), (b) & (c). |
| Answer» C. guard the boiler in case of abnormal rise in steam pressure. | |
| 19. |
For dynamic strain measurement, the wheatstone bridge used is of __________ type. |
| A. | voltage sensitive null |
| B. | voltage sensitive deflected |
| C. | current sensitive deflected |
| D. | none of these |
| Answer» C. current sensitive deflected | |
| 20. |
Which drug is made from vegetables ? |
| A. | Pencilin |
| B. | Aspirin |
| C. | Quinine |
| D. | Insulin |
| Answer» D. Insulin | |
| 21. |
Which of the following are made out of the carbon steel having carbon content of 0.9 to 1% ? |
| A. | Small punches, broaches reamers and springs. |
| B. | Cutlery, screws, rivets and files. |
| C. | Mandrels, twist drills, small lathe tools and razors. |
| D. | Forgings like can shaft, structural steel plate, threading dies and drawing dies. |
| Answer» B. Cutlery, screws, rivets and files. | |
| 22. |
Material of construction of surveying metallic tapes is __________ which has low coefficient of expansion & enough strength. |
| A. | constantan |
| B. | invar |
| C. | pewter metal |
| D. | monel metal |
| Answer» C. pewter metal | |
| 23. |
Welded joint is superior to revetted joint in respect of ease of fabrication, weight and strength. Which of the following joints is the most suitable for pipes carrying fluids under high pressure and temperature ? |
| A. | Flanged joint |
| B. | Expansion joint |
| C. | Bell and spigot joint |
| D. | None of these |
| Answer» C. Bell and spigot joint | |
| 24. |
__________ of test specimens is not involved in any hardness testing method. |
| A. | Fracture |
| B. | Indentation |
| C. | Wear |
| D. | Scratch |
| Answer» B. Indentation | |
| 25. |
Out of the following, the most ductile material is |
| A. | mild steel |
| B. | copper |
| C. | nickel |
| D. | aluminium |
| Answer» B. copper | |
| 26. |
Which of the following will resist maxi-mum shock & vibration without cracking? |
| A. | Grey cast iron |
| B. | White cast iron |
| C. | Malleable iron |
| D. | Graphite |
| Answer» D. Graphite | |
| 27. |
Production of a hollow product by inflation of a tube or parison is called the __________ process. |
| A. | blow moulding |
| B. | calendering |
| C. | extrusion |
| D. | injection |
| Answer» B. calendering | |
| 28. |
A spark ignition petrol engine has |
| A. | throttle valve |
| B. | carburettor |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 29. |
Out of the following, the highest emf for a given temperature is generated by the __________ thermocouple. |
| A. | chromel - alumel |
| B. | iron - constantan |
| C. | platinum - platinum + rhodium |
| D. | copper-constantan |
| Answer» C. platinum - platinum + rhodium | |
| 30. |
Which is the only metal that exists in liquid state at room temperature? |
| A. | Sodium |
| B. | Mercury |
| C. | Lithium |
| D. | Strontium |
| Answer» C. Lithium | |
| 31. |
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 | |
| 32. |
Commonly employed coolant for high pressure turbogenerator is |
| A. | air |
| B. | carbon dioxide |
| C. | hydrogen |
| D. | water |
| Answer» D. water | |
| 33. |
Slight displacement of a floating body in liquid makes it to oscillate about its |
| A. | centre of pressure. |
| B. | centre of gravity. |
| C. | metacentre. |
| D. | centre of pressure. |
| Answer» D. centre of pressure. | |
| 34. |
Buoyancy force depends on the __________ the liquid. |
| A. | depth of immersion in |
| B. | displaced mass of |
| C. | surface tension of |
| D. | viscosity of |
| Answer» C. surface tension of | |
| 35. |
Disposable patterns are made of |
| A. | metal |
| B. | polystyrene |
| C. | rubber |
| D. | wood |
| Answer» C. rubber | |
| 36. |
Annealing of a material does not |
| A. | permit its further cold working. |
| B. | soften it. |
| C. | case harden it. |
| D. | none of these. |
| Answer» D. none of these. | |
| 37. |
Which of the following is not an ore of aluminium ? |
| A. | Troosite |
| B. | Kaolin |
| C. | Alunite |
| D. | Cryolite |
| Answer» B. Kaolin | |
| 38. |
Castability of aluminium is increased by the addition of __________ in it. |
| A. | silicon |
| B. | manganese |
| C. | bismuth |
| D. | lead |
| Answer» B. manganese | |
| 39. |
With increase in pressure, the saturation temperature of steam |
| A. | increases rapidly first and then slowly. |
| B. | increases slowly first and then rapidly. |
| C. | first increases and then decreases. |
| D. | none of these. |
| Answer» B. increases slowly first and then rapidly. | |
| 40. |
'Sterilised zone' around a hazardous chemical industry is an area with __________ km radius around it, in which the total population/inhabitants should be less than 20000 preferably in the upwind direction. |
| A. | 0.5 |
| B. | 5 |
| C. | 25 |
| D. | 50 |
| Answer» C. 25 | |
| 41. |
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. | |
| 42. |
A thin, flat & square plate measuring 2 m x 2 m is freely hanging in ambient air at 25 C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m2 . The plate temperature will remain constant at 30 C, if the convective heat transfer co-efficient is __________ W/m2 C. |
| A. | 50 |
| B. | 100 |
| C. | 150 |
| D. | 200 |
| Answer» C. 150 | |
| 43. |
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 | |
| 44. |
During brazing, if the fluxes are entrapped, it results in the |
| A. | distortion of brazed joints. |
| B. | cracking of joints. |
| C. | presence of gas pockets. |
| D. | corrosion. |
| Answer» E. | |
| 45. |
Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m2 .k), when the insulation thickness is __________ mm. |
| A. | 15 |
| B. | 25 |
| C. | 10 |
| D. | 30 |
| Answer» C. 10 | |
| 46. |
All modes of heat transfer i.e., conduction, convection & radiation occur in case of the |
| A. | condensation of steam in a partial condenser. |
| B. | boiler furnace. |
| C. | insulated pipe car raying high pressure steam. |
| D. | none of these. |
| Answer» C. insulated pipe car raying high pressure steam. | |
| 47. |
In a titration involving weak acid and strong base, the preferred indicator is |
| A. | Methyl orange |
| B. | Phenolphthalein |
| C. | Ethyl orange |
| D. | Fehling's solution |
| Answer» C. Ethyl orange | |
| 48. |
The dimensions of Planck's constant is the same as that of the |
| A. | kinetic energy |
| B. | momentum |
| C. | electrostatic potential |
| D. | none of these |
| Answer» E. | |
| 49. |
Minimum diameter of the tube used for making water manometer should be __________ mm to avoid a correction for the effect of capillarity. |
| A. | 1 |
| B. | 2.5 |
| C. | 4 |
| D. | 6 |
| Answer» E. | |
| 50. |
Which of the following heat treatment processes is used for softening the hardened material ? |
| A. | Normalising |
| B. | Tempering |
| C. | Annealing |
| D. | None of these |
| Answer» C. Annealing | |