MCQOPTIONS
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MCQOPTIONS
This section includes 8247 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 6501. |
Safety matches is produced using |
| A. | red phosphorus |
| B. | yellow phosphorus |
| C. | black phosphorus |
| D. | elemental sulphur |
| Answer» B. yellow phosphorus | |
| 6502. |
Calorific value of __________ are almost same. |
| A. | lignite & anthracite coal |
| B. | lignite & coal gas |
| C. | petrol & diesel |
| D. | coal gas & natural gas |
| Answer» D. coal gas & natural gas | |
| 6503. |
Commonly used flux for brazing is |
| A. | zinc chloride |
| B. | borax |
| C. | ammonium chloride |
| D. | rosin |
| Answer» C. ammonium chloride | |
| 6504. |
Iron has got __________ isotopes. |
| A. | no |
| B. | four |
| C. | three |
| D. | two |
| Answer» C. three | |
| 6505. |
Ceramic compounds as compared to metallic compounds |
| A. | crystallise faster. |
| B. | resist greater tensile stress at room temperature. |
| C. | have higher melting temperature. |
| D. | are better conductor of electricity at higher temperature. |
| Answer» D. are better conductor of electricity at higher temperature. | |
| 6506. |
Pressure exerted by a liquid depends upon its |
| A. | surface tension |
| B. | density |
| C. | viscosity |
| D. | buoyancy |
| Answer» C. viscosity | |
| 6507. |
The most detrimental impurity in high pressure boiler feed water is |
| A. | suspended salt |
| B. | dissolved salt |
| C. | silica |
| D. | turbidity |
| Answer» D. turbidity | |
| 6508. |
With increase in carbon percentage in steel, its |
| A. | yield stress decreases. |
| B. | elongation percent increases. |
| C. | tensile strength increases. |
| D. | impact strength increases. |
| Answer» D. impact strength increases. | |
| 6509. |
Percentage of gaunge is maximum in the ore of |
| A. | iron |
| B. | gold |
| C. | zinc |
| D. | copper |
| Answer» C. zinc | |
| 6510. |
The forms in which various metals and non metals occur in nature are called minerals. Which of the following is not a metallic ferrous mineral? |
| A. | Cassiterite |
| B. | Sphalerite |
| C. | Chalcopyrite |
| D. | Calcite |
| Answer» E. | |
| 6511. |
The most commonly used material for sewers for carrying sewage in the normal situation is |
| A. | asbestos cement |
| B. | stainiess steel |
| C. | stoneware |
| D. | cast iron |
| Answer» D. cast iron | |
| 6512. |
Hot extrusion of aluminium is done in the temperature range of __________ C. |
| A. | 550-600 |
| B. | 450-500 |
| C. | 350-400 |
| D. | 250-300 |
| Answer» D. 250-300 | |
| 6513. |
Stellite is a __________ material. |
| A. | ferrous |
| B. | ceramic |
| C. | cemented carbide |
| D. | non ferrous cast alloy cutting tool |
| Answer» E. | |
| 6514. |
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. | |
| 6515. |
An abrupt and sudden fall in the readinp of barometer is an indication of the |
| A. | storm |
| B. | rain |
| C. | clear weather |
| D. | cold wave |
| Answer» B. rain | |
| 6516. |
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 | |
| 6517. |
The burnout heat flux in the nucleate boiling regime is not a function of the |
| A. | liquid density. |
| B. | vapour density. |
| C. | temperature difference. |
| D. | heat of evaporation. |
| Answer» C. temperature difference. | |
| 6518. |
The approximate height of a blast furnace having a useful volume of 2000 m3 is about __________ metres |
| A. | 25 |
| B. | 35 |
| C. | 55 |
| D. | 75 |
| Answer» D. 75 | |
| 6519. |
The cathode in an electrochemical cell always carries |
| A. | negative charge. |
| B. | positive charge. |
| C. | zero charge. |
| D. | positive or negative charge depending upon the nature of the cell. |
| Answer» B. positive charge. | |
| 6520. |
An oxidation process is accompanied with decrease in the |
| A. | number of electrons. |
| B. | oxidation number. |
| C. | number of ions. |
| D. | all (a), (b) & (c). |
| Answer» B. oxidation number. | |
| 6521. |
Hot dipping process is used for coating a low melting point metal (e.g. Pb, Sn, Zn) on iron, steel & copper having relatively higher melting points. Which of the following is not a hot dipping process ? |
| A. | Galvanising |
| B. | Tinning |
| C. | Sheardising |
| D. | none of these |
| Answer» D. none of these | |
| 6522. |
A fluid is termed as the Newtonion fluid, when the shear stress is __________ the velocity gradient. |
| A. | independent of |
| B. | inversely proportional to |
| C. | directly proportional to |
| D. | none of these |
| Answer» D. none of these | |
| 6523. |
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. | |
| 6524. |
When the wet steam is throttled but still remains wet at the exit of the throttle valve, then its temperature & dryness fraction respectively |
| A. | decreases & increases. |
| B. | increases & increases. |
| C. | increases & decreases. |
| D. | decreases & decreases. |
| Answer» B. increases & increases. | |
| 6525. |
The 'transition temperature' for ductile to brittle behaviour of steel increases with increase in the __________ content in steel. |
| A. | carbon |
| B. | manganese |
| C. | both a & b |
| D. | neither 'a' nor 'b' |
| Answer» B. manganese | |
| 6526. |
For the irreversible reaction, Ca+ 2C = Ca C2 , H 298 = - 60000 J . mole-1 . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be |
| A. | 30000 J |
| B. | 60000 J |
| C. | 90000 J |
| D. | 240000 J |
| Answer» D. 240000 J | |
| 6527. |
Projection welding & stud welding is categorised as the __________ welding. |
| A. | pressure |
| B. | thermit |
| C. | resistance |
| D. | arc |
| Answer» D. arc | |
| 6528. |
The driving force for the sintering of a powder compact is |
| A. | strain energy. |
| B. | surface energy. |
| C. | volume energy. |
| D. | stacking fault energy. |
| Answer» C. volume energy. | |
| 6529. |
The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a boiler. |
| A. | evaporative capacity |
| B. | evaporation efficiency |
| C. | thermal efficiency |
| D. | steam load |
| Answer» B. evaporation efficiency | |
| 6530. |
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. | |
| 6531. |
The bank of tubes located at the back of the domestic refrigerators are the __________ tubes. |
| A. | refrigerant cooling |
| B. | evaporator |
| C. | condenser |
| D. | throttling |
| Answer» D. throttling | |
| 6532. |
Material having negative co-efficient of linear expansion is |
| A. | copper |
| B. | aluminium |
| C. | rubber |
| D. | nickel |
| Answer» D. nickel | |
| 6533. |
Specific gravity of hot metal (pig iron) is __________ times that of the blast furnace slag. |
| A. | 2 |
| B. | 3 |
| C. | 0.8 |
| D. | 6 |
| Answer» C. 0.8 | |
| 6534. |
__________ is the hardest material out of the following. |
| A. | Boron carbide |
| B. | Tungsten carbide |
| C. | Hardened steel |
| D. | Silicon carbide |
| Answer» B. Tungsten carbide | |
| 6535. |
The phenomenon of weld decay is found in case of |
| A. | gun metal |
| B. | brass |
| C. | stainless steel |
| D. | cast iron |
| Answer» E. | |
| 6536. |
Notched bar test is used for testing the __________ of a material. |
| A. | impact strength |
| B. | endurance limit |
| C. | machinability |
| D. | corrosion resistance |
| Answer» B. endurance limit | |
| 6537. |
The most suitable material for die casting is |
| A. | iron |
| B. | copper |
| C. | steel |
| D. | nickel |
| Answer» C. steel | |
| 6538. |
Heating of an ore below its melting point in presence of excess of air is called |
| A. | calcination |
| B. | smelting |
| C. | roasting |
| D. | sublimation |
| Answer» D. sublimation | |
| 6539. |
Depreciation of machines fails under the indirect expenses head. As per income tax regulations, it is calculated by the __________ method. |
| A. | diminishing balance |
| B. | sinking fund |
| C. | multiple straight line |
| D. | sum of the years digit |
| Answer» B. sinking fund | |
| 6540. |
Nusselt number/Biot number varies |
| A. | inversely with thermal conductivity. |
| B. | directly with heat transfer co-efficient. |
| C. | directly with thermal conductivity. |
| D. | inversely with the dimension of the solid. |
| Answer» B. directly with heat transfer co-efficient. | |
| 6541. |
Out of the following, maximum temperature drop for a given heat flow & for the same thickness will be in the case of |
| A. | steel |
| B. | glass wood |
| C. | copper |
| D. | fireclay bricks |
| Answer» C. copper | |
| 6542. |
Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type |
| A. | parallel flow with equal heat capacities. |
| B. | counter flow with equal heat capacities. |
| C. | counter flow with unequal heat capacities. |
| D. | parallel flow with unequal heat capacities. |
| Answer» C. counter flow with unequal heat capacities. | |
| 6543. |
Rockwell number represents the |
| A. | hardness of a substance. |
| B. | colour of a pigment. |
| C. | density of a polymer. |
| D. | active ingredients in a fertiliser. |
| Answer» B. colour of a pigment. | |
| 6544. |
Which of the following fastening devices has its both ends threaded ? |
| A. | Bolt |
| B. | Stud |
| C. | Set screw |
| D. | Split nut |
| Answer» C. Set screw | |
| 6545. |
A freely floating object is stable, if its centre of buoyancy |
| A. | coincides with its centre of gravity. |
| B. | lies below its centre of gravity. |
| C. | lies below its metacentre. |
| D. | none of these. |
| Answer» B. lies below its centre of gravity. | |
| 6546. |
Which of the following materials does not form adherent oxide film on surface ? |
| A. | Copper |
| B. | Nickel |
| C. | Aluminium |
| D. | Gold & silver |
| Answer» E. | |
| 6547. |
Cassiterite is an ore of |
| A. | tin |
| B. | lead |
| C. | molybdenum |
| D. | chromium |
| Answer» B. lead | |
| 6548. |
In sheet metal forming, stretcher strains occur in |
| A. | duralumin sheets. |
| B. | low carbon steel sheets. |
| C. | austenitic stainless steel sheets . |
| D. | Ni-base alloy sheets. |
| Answer» B. low carbon steel sheets. | |
| 6549. |
For grinding of softer materials, the grinding wheel should have __________ grain size. |
| A. | finer |
| B. | coarser |
| C. | medium |
| D. | any type of |
| Answer» C. medium | |
| 6550. |
The cost of providing service in a queing system decreases with the |
| A. | increased mean time in the queue. |
| B. | increased arrival rate. |
| C. | decreased mean time in the queue. |
| D. | decreased arrival rate. |
| Answer» B. increased arrival rate. | |