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. |
During sensible cooling of air, its wet bulb temperature |
| A. | decreases but dew point remains constant. |
| B. | increases but dew point remains constant. |
| C. | increases & the dew point decreases. |
| D. | decreases & the dew point increases. |
| Answer» C. increases & the dew point decreases. | |
| 2. |
A material is capable of resisting softening at high temperature, because of its property termed as |
| A. | hot temper |
| B. | hot hardness |
| C. | fatigue |
| D. | creep |
| Answer» C. fatigue | |
| 3. |
Cascade control is |
| A. | the continuous adjustment of the set point index of an automatic control loop by a primary (master) controller. |
| B. | used when changes in process conditions cause serious upsets in the controlled variable. |
| C. | useful to control flow from temperature. |
| D. | all 'a', 'b' & 'c'. |
| Answer» E. | |
| 4. |
Which of the following alloying elements is present in maximum percentage in high speed steel. |
| A. | Molybdenum |
| B. | Chromium |
| C. | Tungsten |
| D. | Vanadium |
| Answer» B. Chromium | |
| 5. |
According to maximum shear stress failure criterion, yielding in material occurs, when the maximum shear stress is equal to __________ times the yield stress. |
| A. | 0.5 |
| B. | 2 |
| C. | <span class="root">2</span> |
| D. | <span class="root">3</span> |
| E. | /2 |
| Answer» B. 2 | |
| 6. |
Softening of hardned steel is done by its |
| A. | normalising |
| B. | tempering |
| C. | annealing |
| D. | carburising |
| Answer» B. tempering | |
| 7. |
Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about |
| A. | 9:1 |
| B. | 17 : 1 |
| C. | 23 : 1 |
| D. | 29 : 1 |
| Answer» C. 23 : 1 | |
| 8. |
__________ is a non volatile film forming constituent of a paint. |
| A. | Thinner |
| B. | Dryer |
| C. | Drying oil |
| D. | none of these |
| Answer» D. none of these | |
| 9. |
Transformer cores are normally made from |
| A. | soft ferrites |
| B. | high purity iron |
| C. | grain oriented Fe-Si alloy |
| D. | Al-Ni-Co alloy |
| Answer» D. Al-Ni-Co alloy | |
| 10. |
__________ test is the appropriate test to determine whether a material is ductile or brittle. |
| A. | Impact |
| B. | Cupping |
| C. | Hardness |
| D. | Tensile |
| Answer» B. Cupping | |
| 11. |
Main constituent of bone ash is |
| A. | ammonium phosphate. |
| B. | calcium phosphate. |
| C. | animal charcoal. |
| D. | ammonium sulphate. |
| Answer» C. animal charcoal. | |
| 12. |
Use of water as a manometric liquid suffers from the disadvantage of its |
| A. | low vapour pressure. |
| B. | corrosive nature. |
| C. | high vapour pressure. |
| D. | high boiling point. |
| Answer» D. high boiling point. | |
| 13. |
The following thermocouple may be used for measuring temperature upto 1873 K. |
| A. | Chromel-alumel |
| B. | Copper-constantan |
| C. | Platinum-platinum rhodium |
| D. | Iron-constatan |
| Answer» D. Iron-constatan | |
| 14. |
Closeness of packing is maximum in case of __________ crystal lattice. |
| A. | face centred |
| B. | simple cubic |
| C. | body centred |
| D. | none of these |
| Answer» B. simple cubic | |
| 15. |
Thermodynamic cycle involved in the working of a thermal power plant is the __________ cycle. |
| A. | Joule |
| B. | Carnot |
| C. | Rankine |
| D. | Brayton |
| Answer» D. Brayton | |
| 16. |
The underground well of a biogas plant is called the |
| A. | septic tank |
| B. | oxidation well |
| C. | digestor |
| D. | lagoon |
| Answer» D. lagoon | |
| 17. |
Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog? |
| A. | Nitrogen oxides |
| B. | Hydrocarbons |
| C. | both 'a' & 'b' |
| D. | Carbon monoxide |
| Answer» D. Carbon monoxide | |
| 18. |
Valves in pipe size of 2" and under are normally made of |
| A. | wrought iron |
| B. | brass |
| C. | bronze |
| D. | monel |
| Answer» C. bronze | |
| 19. |
Ceramic materials are |
| A. | organic in nature. |
| B. | stronger in compression than in tension |
| C. | always amorphous in nature. |
| D. | always bad heat conductors. |
| Answer» C. always amorphous in nature. | |
| 20. |
In the Contact process of sulphuric acid manufacture, 98% acid cooler is made of |
| A. | stainless steel |
| B. | cast iron |
| C. | lead lined steel |
| D. | rubber lined steel |
| Answer» C. lead lined steel | |
| 21. |
For platinum thermocouples, lead wires are made of |
| A. | copper & copper-nickel alloys. |
| B. | copper & iron. |
| C. | iron & nickel. |
| D. | tin & nickel. |
| Answer» B. copper & iron. | |
| 22. |
High resistance electrical heating elements/wire are not made of |
| A. | marageing steel |
| B. | nimonic alloys |
| C. | kanthal wire |
| D. | nichrome |
| Answer» B. nimonic alloys | |
| 23. |
Cast irons are generally specified by their |
| A. | carbon percentage |
| B. | tensile strength |
| C. | hardness |
| D. | iron percentage |
| Answer» C. hardness | |
| 24. |
Which is an amorphous material ? |
| A. | Glass |
| B. | Mica |
| C. | Brass |
| D. | Cast iron |
| Answer» B. Mica | |
| 25. |
Which one is remelted and poured into moulds to get cast iron ? |
| A. | Wrought iron |
| B. | Pig iron |
| C. | Low carbon steel |
| D. | Mild steel |
| Answer» C. Low carbon steel | |
| 26. |
Wood metal is not used for making |
| A. | soft solder. |
| B. | casting for dental work. |
| C. | storage tank for storing brine and caustic soda. |
| D. | fusible safety plug for pressure cooker. |
| Answer» D. fusible safety plug for pressure cooker. | |
| 27. |
Babbit metal is not a |
| A. | tin base alloy |
| B. | white metal |
| C. | lead base alloy |
| D. | pure metal |
| Answer» E. | |
| 28. |
Which of the following alloys does not contain nickel ? |
| A. | Chloro, et-2 alloy |
| B. | Monel |
| C. | Inconel |
| D. | Babbit metal |
| Answer» E. | |
| 29. |
Which of the following is the lightest of engineering metals ? |
| A. | Magnesium |
| B. | Aluminium |
| C. | Titanium |
| D. | Tin |
| Answer» B. Aluminium | |
| 30. |
Evaporators used in caustic soda recovery and production plant are made of |
| A. | monel metal |
| B. | gun metal |
| C. | wood metal |
| D. | babbit metal |
| Answer» B. gun metal | |
| 31. |
With increase in carbide/graphite ratio in cast iron, its |
| A. | hardness & brittleness increases. |
| B. | ductility decreases. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 32. |
Ammonium chloride solution is stored/ treated in __________ vessels/pipes. |
| A. | plain carbon steel |
| B. | stainless steel |
| C. | rubber or durmet-20 lined |
| D. | lead |
| Answer» D. lead | |
| 33. |
Nickel and copper are the basic constituents of |
| A. | hastelloy |
| B. | monel metal |
| C. | German silver |
| D. | inconel |
| Answer» C. German silver | |
| 34. |
Copper has very low |
| A. | malleability |
| B. | ductility |
| C. | tensile strength |
| D. | thermal & electrical conductivity |
| Answer» D. thermal & electrical conductivity | |
| 35. |
Hardest material so far found is |
| A. | diamond |
| B. | graphite |
| C. | carborundum |
| D. | pumice stone |
| Answer» B. graphite | |
| 36. |
The largest consumption of zinc for alloys is in the making of |
| A. | bearing metal |
| B. | brasses |
| C. | brazing solder |
| D. | die casting alloys |
| Answer» C. brazing solder | |
| 37. |
Most suitable material of construction for the storage of concentrated nitric acid is |
| A. | cast iron |
| B. | monel |
| C. | karbate |
| D. | aluminium or chromium alloys (Cr > 18% for cold acid) |
| Answer» E. | |
| 38. |
Mild steel is used for making |
| A. | fish plates |
| B. | die block |
| C. | channels |
| D. | drop forging |
| Answer» D. drop forging | |
| 39. |
Presence of 0.3 to 0.5% arsenic in copper increases its |
| A. | ductility |
| B. | malleability |
| C. | tenacity & hardness |
| D. | electrical conductivity |
| Answer» D. electrical conductivity | |
| 40. |
The heat treatment process applied to cold formed steel parts is |
| A. | normalising |
| B. | tempering |
| C. | artificial ageing |
| D. | solution annealing |
| Answer» E. | |
| 41. |
Plate and frame filter press is usually made of |
| A. | mild steel |
| B. | cast iron |
| C. | stainless steel |
| D. | galvanised iron |
| Answer» C. stainless steel | |
| 42. |
The fermentor used in the production of pencillin (by deep fermentation process) is made of |
| A. | glass |
| B. | glass lined steel |
| C. | high silicon cast iron |
| D. | procelain |
| Answer» C. high silicon cast iron | |
| 43. |
Nickel (76%) and chromium (15%) alloys are termed as |
| A. | inconel |
| B. | monel |
| C. | aluminium bronzes |
| D. | brass |
| Answer» B. monel | |
| 44. |
White metal is an alloy of |
| A. | lead, tin and cadmium |
| B. | copper, tin and zinc |
| C. | copper and lead |
| D. | none of these |
| Answer» E. | |
| 45. |
The carbonating tower used in Solvay process of soda ash manufacture is made of |
| A. | cast iron |
| B. | stainless steel |
| C. | karbate |
| D. | lead lined steel |
| Answer» B. stainless steel | |
| 46. |
The most resistant material to alkaline corrosion is |
| A. | duriron |
| B. | nickel |
| C. | aluminium |
| D. | karbate |
| Answer» C. aluminium | |
| 47. |
Tin coating is not done by |
| A. | vaporising |
| B. | hot dipping |
| C. | electro deposition |
| D. | spraying |
| Answer» B. hot dipping | |
| 48. |
Low carbon steels are those in which carbon percentage is around |
| A. | 0.1 to 0.35 |
| B. | 0.4 to 0.7 |
| C. | 0.8 to 1.5 |
| D. | 1.5 to 2 |
| Answer» B. 0.4 to 0.7 | |
| 49. |
Stainless steel is not corroded by |
| A. | hydrochloric acid (10%). |
| B. | nitric acid (10%). |
| C. | sulphuric acid (10%). |
| D. | saturated brine. |
| Answer» C. sulphuric acid (10%). | |
| 50. |
__________ is added in stainless steel to prevent inter crystal corrosion. |
| A. | Vanadium |
| B. | Niobium |
| C. | Chromium |
| D. | Nickel |
| Answer» C. Chromium | |