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. |
Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil, N2 = 80%. This flue gas composition indicates that_________________? |
| A. | Pure oxygen has been used for combustion |
| B. | Nitrogen percentage in the fuel is very high |
| C. | Excess air has been used for combustion |
| D. | Hydrogen is not present in the fuel |
| Answer» D. Hydrogen is not present in the fuel | |
| 2. |
Volume of blast furnace slag is about _______________ times the volume of hot metal (pig iron) of the same weight ? |
| A. | 1.5 |
| B. | 3 |
| C. | 5 |
| D. | 7 |
| Answer» C. 5 | |
| 3. |
Viscoelastic behaviour is observed in _______________________ materials? |
| A. | Non-crystalline organic polymeric |
| B. | Ceramic |
| C. | All crystalline |
| D. | All amorphous |
| Answer» B. Ceramic | |
| 4. |
Vernier calipers cannot be used to measure the______________________? |
| A. | I.D. & O.D. of the shaft |
| B. | Thickness of parts |
| C. | Depth of holes |
| D. | Clearance between two mating surfaces |
| Answer» E. | |
| 5. |
Venturimeter is used to measure the flow rate of fluids in pipes, when the pipe is in ______________ position ? |
| A. | Horizontal |
| B. | Vertical |
| C. | Inclined |
| D. | Any |
| Answer» E. | |
| 6. |
Velocity of a gas in sound is not proportional to (where, T = Absolute temperature of the gas. P = Absolute pressure of the gas. y = Ratio of specific heats (Cp/Cv) ρ = specific weight of the gas) ? |
| A. | √T |
| B. | 1/√P |
| C. | √y |
| D. | 1/√ρ |
| Answer» C. √y | |
| 7. |
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 | |
| 8. |
Use of flux during soldering is done to__________________? |
| A. | Increase fluidity of solder by lowering its melting temperature |
| B. | Prevent oxide formation |
| C. | Wash away surplus solder |
| D. | Full up the joint gap |
| Answer» C. Wash away surplus solder | |
| 9. |
Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about _______________ percent ? |
| A. | 1 |
| B. | 10 |
| C. | 30 |
| D. | 50 |
| Answer» C. 30 | |
| 10. |
Upto the critical radius of insulation, added insulation, will____________________? |
| A. | Increase the heat loss |
| B. | Decrease heat loss and will have no effect beyond that |
| C. | Decrease heat flux |
| D. | Reduce convection heat loss compared to conduction heat less |
| Answer» C. Decrease heat flux | |
| 11. |
Unit of viscosity in CGS system is_______________________? |
| A. | gm .cm-1 sec-1 |
| B. | gm . cm2 . sec-2 |
| C. | gm .cm-2, sec-1 |
| D. | gm . cm . sec-1 |
| Answer» B. gm . cm2 . sec-2 | |
| 12. |
Unit of surface tension in S.I. unit is_________________? |
| A. | Watt/m |
| B. | Joule/m2 |
| C. | Newton/m2 |
| D. | Joule/m |
| Answer» C. Newton/m2 | |
| 13. |
Uniform ramming of sand in green sand moulding process leads to____________________? |
| A. | Reduced chance of gas porosity |
| B. | Greater dimensional stability of the casting |
| C. | Uniform flow of molten metal into the mould cavity |
| D. | Less sand expansion type of casting defect |
| Answer» C. Uniform flow of molten metal into the mould cavity | |
| 14. |
Unbreakable crockeries are made from ______________ polymers? |
| A. | Polystyrene |
| B. | Melamine |
| C. | Polystyrene |
| D. | Polyurethane |
| Answer» E. | |
| 15. |
Ultimate strength in tension as compared to that in shear for steel is____________________? |
| A. | Half |
| B. | One third |
| C. | One and half times |
| D. | One fourth |
| Answer» D. One fourth | |
| 16. |
Two wires of the same radius & material having length in the ratio of 1 : 2 are stretched by the same force. The strain produced in the two wires will be in the ratio of__________________? |
| A. | 1 : 1 |
| B. | 1 : 2 |
| C. | 2 : 1 |
| D. | 1 : 4 |
| Answer» B. 1 : 2 | |
| 17. |
Two solutions A1 & A2 have pH value of 2 & 6 respectively. It implies that the solution ? |
| A. | A1 is more alkaline than solution A2 |
| B. | A1 is highly acidic |
| C. | A2 is very slightly acidic |
| D. | Both B. & C. |
| Answer» E. | |
| 18. |
Tumbling is the process of improving the ________________ of the materials/parts ? |
| A. | Surface finish |
| B. | Fatigue limit |
| C. | Creep limit |
| D. | Surface cleanliness |
| Answer» E. | |
| 19. |
Triple point of water is__________________? |
| A. | 0.01 °C |
| B. | 492°R |
| C. | 0°K |
| D. | -273°C |
| Answer» B. 492°R | |
| 20. |
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 | |
| 21. |
Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of ? |
| A. | Grashoff number |
| B. | Grashoff number & Reynolds number |
| C. | Reynolds number |
| D. | Grashoff number & Prandtl number |
| Answer» E. | |
| 22. |
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 | |
| 23. |
Transformation range for ferrous material is the temperature interval during which ___________________ is formed during its heating? |
| A. | Cementite |
| B. | Austenite |
| C. | Martensite |
| D. | Pearlite |
| Answer» C. Martensite | |
| 24. |
To improve the machinability of steel, it is generally subjected to _____________________? |
| A. | Spheroidising |
| B. | Tempering |
| C. | Normalising |
| D. | Annealing |
| Answer» B. Tempering | |
| 25. |
To counteract the bad effects of strain hardening on a cold formed part, it must be ______________________? |
| A. | Tempered |
| B. | Normalised |
| C. | Annealed |
| D. | Hardened |
| Answer» D. Hardened | |
| 26. |
Titanium is produced by ___________________ of Ti Cl4 ? |
| A. | Electrolytic reduction |
| B. | Calcium reduction |
| C. | Magnesium reduction |
| D. | Thermal dissociation |
| Answer» D. Thermal dissociation | |
| 27. |
Titanium is added to molten aluminium alloys before casting for the purpose of_____________________? |
| A. | Grain refinement |
| B. | Increasing corrosion resistance |
| C. | Reducing porosity |
| D. | Improving fluidity |
| Answer» E. | |
| 28. |
Tip of the match stick contains a mixture of________________? |
| A. | K + S |
| B. | K + S + K2Cr2O7 |
| C. | S + K2Cr2O7 + White P |
| D. | None of these |
| Answer» D. None of these | |
| 29. |
Tin based white metals are used, where bearings are subjected to___________________? |
| A. | High pressure & load |
| B. | Low pressure & load |
| C. | High temperature |
| D. | Large surface wear |
| Answer» B. Low pressure & load | |
| 30. |
Though tin occurs lower than iron in the electrochemical series, yet it is coated on steel for corrosion protection, because of its________________? |
| A. | Lower cost |
| B. | Abundant availability |
| C. | Resistance to vegetable acids as the tin plate are commercially used in ‘canning’ industry |
| D. | None of these |
| Answer» D. None of these | |
| 31. |
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 | |
| 32. |
Thermit welding is categorised as the ______________________ welding ? |
| A. | Forge |
| B. | Fusion |
| C. | Resistance |
| D. | Arc |
| Answer» C. Resistance | |
| 33. |
Thermit welding uses the following energy source ? |
| A. | Electrical energy |
| B. | Chemical energy |
| C. | Energy of high velocity electrons |
| D. | Heat generated by friction |
| Answer» C. Energy of high velocity electrons | |
| 34. |
Thermal equivalent of electrical power in practical calculation is _______________ kcal/kWh ? |
| A. | 746 |
| B. | 3000 |
| C. | 1000 |
| D. | 550 |
| Answer» C. 1000 | |
| 35. |
Thermal efficiency of an internal combustion engine is around ______________ percent? |
| A. | 8 |
| B. | 35 |
| C. | 65 |
| D. | 80 |
| Answer» C. 65 | |
| 36. |
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 | |
| 37. |
Thermal conductivity of a material does not depend upon its_____________________? |
| A. | Mass |
| B. | Volume |
| C. | Surface area |
| D. | All A, C & C |
| Answer» E. | |
| 38. |
Theoretical volume of oxygen required for complete combustion of 1Nm3 of acetylene, in oxy-acetylene welding is ______________ Nm3 ? |
| A. | 0.5 |
| B. | 1 |
| C. | 1/3 |
| D. | 2.5 |
| Answer» E. | |
| 39. |
The yield point phenomenon observed in annealed low carbon steel is due to the presence of the following element ? |
| A. | Silicon |
| B. | Carbon |
| C. | Phosphorous |
| D. | Chromium |
| Answer» C. Phosphorous | |
| 40. |
The value of y = cp/cv. at < 500°C for air & most common gases can be safely assumed to be_____________________? |
| A. | 0.8 |
| B. | 1 |
| C. | 1.4 |
| D. | 1.8 |
| Answer» D. 1.8 | |
| 41. |
The usual energy consumption in electric arc furnace steel making is _____________ KWh/ton of steel ? |
| A. | 60 – 100 |
| B. | 400 – 700 |
| C. | 1200 -1500 |
| D. | 2000 – 2300 |
| Answer» C. 1200 -1500 | |
| 42. |
The unit of gc is ___________________? |
| A. | lbm/lbf. ft/sec2 |
| B. | lbf/lbm. ft/sec2 |
| C. | ft/sec2 |
| D. | lbm/lbf. sec2/ft |
| Answer» B. lbf/lbm. ft/sec2 | |
| 43. |
The underground well of a bio gas plant is called the________________? |
| A. | Septic tank |
| B. | Oxidation well |
| C. | Digestor |
| D. | Lagoon |
| Answer» D. Lagoon | |
| 44. |
The type of pump used for lifting large quantity of sewage is a _________________ pump ? |
| A. | Gear |
| B. | Centrifugal |
| C. | Reciprocating |
| D. | Plunger |
| Answer» C. Reciprocating | |
| 45. |
The two elements required to form substitutional solid solution should not have___________________? |
| A. | Same crystalline structure |
| B. | Same valency |
| C. | Widely differing electronegativity |
| D. | Same atomic sizes |
| Answer» D. Same atomic sizes | |
| 46. |
The ‘transition temperature’ for ductile to brittle behavior of steel increases with increase in the _____________ content in steel? |
| A. | Carbon |
| B. | Manganese |
| C. | Both A nor B |
| D. | Neither A nor B |
| Answer» B. Manganese | |
| 47. |
The transition temperature at which all the ferromagnetic materials become paramagnetic materials is termed as the ‘Curie temperature’. Its value for cobalt is ______________ °C? |
| A. | 768 |
| B. | 1127 |
| C. | 1359 |
| D. | 1480 |
| Answer» C. 1359 | |
| 48. |
The trace metal present in insulin is____________________? |
| A. | Cu |
| B. | Zn |
| C. | Fe |
| D. | Ni |
| Answer» C. Fe | |
| 49. |
The thickness of oxide film is y at time t. If K1, K2 and K3 are the temperature dependent constants, the parabolic law of oxidation is given by __________________? |
| A. | y2 = 2k1t + k2 |
| B. | y = k1 ln (k2t + k3) |
| C. | y = k1 t + k2 |
| D. | y = k1t3 + k2 |
| Answer» B. y = k1 ln (k2t + k3) | |
| 50. |
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 | |