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.
| 6451. |
Even though heat transfer co-efficients in boiling liquids is large, use of fins is advantageous, when the entire surface is exposed to __________ boiling. |
| A. | film |
| B. | nucleate |
| C. | transition |
| D. | all modes of |
| Answer» B. nucleate | |
| 6452. |
Oxide layer formed on the non-ferrous metal surface after its annealing is |
| A. | removed by acid pickling. |
| B. | hammered into the surface. |
| C. | removed with coarse emery cloth. |
| D. | left as such to protect the surface. |
| Answer» B. hammered into the surface. | |
| 6453. |
When water is sprayed on air, passing through an insulated chamber maintained at a temperature higher than the dew point of entering air but lower than its dry bulb temperature, then the air is |
| A. | cooled and dehumified. |
| B. | heated and humidified. |
| C. | cooled and humidified. |
| D. | heated and dehumidified. |
| Answer» D. heated and dehumidified. | |
| 6454. |
Device used as a standard for the calibration of pressure gauges is a |
| A. | bellow |
| B. | diaphragm |
| C. | dead weight pressure tester |
| D. | mercury manometer |
| Answer» D. mercury manometer | |
| 6455. |
Diffusion co-efficient of a metal in a solid solution depends upon its |
| A. | composition |
| B. | temperature |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 6456. |
Cast iron contains __________ percent carbon. |
| A. | 2.5 |
| B. | 3.75 |
| C. | 4.75 |
| D. | 5.25 |
| Answer» B. 3.75 | |
| 6457. |
Alloys having more than 80% copper are generally more |
| A. | abrasion resistant. |
| B. | corrosion resistant. |
| C. | prone to season cracking. |
| D. | machinable. |
| Answer» C. prone to season cracking. | |
| 6458. |
Factor of safety in machine design is defined as the ratio of ultimate stress to __________ stress. |
| A. | working |
| B. | bearing |
| C. | yield |
| D. | none of these |
| Answer» B. bearing | |
| 6459. |
Out of the following, the __________ pipe has the least corrosion resistance. |
| A. | mild steel |
| B. | copper |
| C. | cast iron |
| D. | wrought iron |
| Answer» E. | |
| 6460. |
With increase in steam pressure, its specific volume decreases |
| A. | rapidly first and then slowly. |
| B. | linearly. |
| C. | slowly first and then rapidly. |
| D. | exponentially. |
| Answer» B. linearly. | |
| 6461. |
Which of the following rays has the least wavelength? |
| A. | Ultraviolet rays |
| B. | Infrared rays |
| C. | Cosmic rays |
| D. | X-rays |
| Answer» D. X-rays | |
| 6462. |
Hydrocyclone is a |
| A. | crusher |
| B. | wet classifier |
| C. | dry classifier |
| D. | magnetic separator |
| Answer» C. dry classifier | |
| 6463. |
Ammonia leakage in the refrigeration system is detected by |
| A. | sulphur stick, which on detection gives white smoke. |
| B. | using chemical reagents. |
| C. | its smell. |
| D. | soap solution. |
| Answer» B. using chemical reagents. | |
| 6464. |
Fibre glass is a composite material of |
| A. | glass fibre in a polymer matrix. |
| B. | glass fibre in a metallic matrix. |
| C. | polymer fibre in a glassy matrix. |
| D. | both 'b' & 'c'. |
| Answer» B. glass fibre in a metallic matrix. | |
| 6465. |
According to thermodynamic Farenhite scale, the fundamental interval between ice point to steam point is |
| A. | 180 |
| B. | 212 |
| C. | 32 |
| D. | 273 |
| Answer» B. 212 | |
| 6466. |
Maximum consumption of limestone is in the __________ industry. |
| A. | iron and steel |
| B. | cement |
| C. | glass |
| D. | fertiliser |
| Answer» E. | |
| 6467. |
Austenite is not |
| A. | ductile |
| B. | malleable |
| C. | magnetic |
| D. | soft |
| Answer» D. soft | |
| 6468. |
Wood is a/an __________ material. |
| A. | amorphous |
| B. | cellular |
| C. | homogeneous |
| D. | grannular |
| Answer» C. homogeneous | |
| 6469. |
Use of flux during soldering is done to |
| A. | increase flidity 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. | |
| 6470. |
Resilience of a bolt can be increased by increasing its |
| A. | length |
| B. | shank diameter |
| C. | head diameter |
| D. | none of these |
| Answer» B. shank diameter | |
| 6471. |
The hardness of the lathe bed material is measured by the |
| A. | shore sceleroscope. |
| B. | Brinnel hardness tester. |
| C. | Vicker's hardness tester. |
| D. | Rockwell hardness tester. |
| Answer» B. Brinnel hardness tester. | |
| 6472. |
RADAR is |
| A. | acronym for Radio Detection and Ranging. |
| B. | name of technique for locating distant objects. |
| C. | name of instrument for locating distant objects. |
| D. | all (a), (b) & (c) |
| Answer» E. | |
| 6473. |
In the floatation process, pine oil is used as the |
| A. | collector |
| B. | activator |
| C. | frother |
| D. | depressant |
| Answer» D. depressant | |
| 6474. |
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 | |
| 6475. |
Semi-conductors normally employ __________ bonding. |
| A. | co-ordinate |
| B. | ionic |
| C. | covalant |
| D. | metallic |
| Answer» D. metallic | |
| 6476. |
In __________ process, there is an increase in entropy with no degradation of energy. |
| A. | isothermal expansion |
| B. | isochoric heat addition |
| C. | polytropic expansion |
| D. | isobaric heat addition |
| Answer» B. isochoric heat addition | |
| 6477. |
Which of the following is categorised as the plastic welding ? |
| A. | Gas welding |
| B. | Electric arc welding |
| C. | Forge welding |
| D. | None of these |
| Answer» D. None of these | |
| 6478. |
In spite of large heat transfer co-efficients in boiling liquids, fins are used advantageously, where the entire surface is exposed to __________ boiling. |
| A. | film |
| B. | nucleate |
| C. | transition |
| D. | all modes of |
| Answer» E. | |
| 6479. |
Silicon percentage in silicon steel used for electrical equipments is about |
| A. | 1 |
| B. | 4.0 |
| C. | 8 |
| D. | 14 |
| Answer» C. 8 | |
| 6480. |
The refractory lining of the bottom in a basic electric arc furnace is made of |
| A. | silica |
| B. | alumina |
| C. | magnesia |
| D. | fireclay |
| Answer» D. fireclay | |
| 6481. |
Alcohols are not suitable as diesel engine fuel because the cetane number of alcohols is |
| A. | very low which prevents their ignition by compression. |
| B. | very high which prevents their ignition by compression |
| C. | zero. |
| D. | none of these. |
| Answer» B. very high which prevents their ignition by compression | |
| 6482. |
Matte smelting is used in the extraction of |
| A. | lead |
| B. | zinc |
| C. | aluminium |
| D. | copper |
| Answer» E. | |
| 6483. |
Compressed dry air is used as the cutting fluid, while machining |
| A. | steel |
| B. | cast iron |
| C. | aluminium |
| D. | none of these |
| Answer» C. aluminium | |
| 6484. |
Catalyst used in the 'catalytic converter' employed in automobile exhaust line for complete combustion/oxidation of carbon monoxide, nitrogen oxides and hydrocarbons is |
| A. | alumina |
| B. | platinum |
| C. | vanadium pentoxide |
| D. | iron oxide |
| Answer» C. vanadium pentoxide | |
| 6485. |
Liquid nitrogen containers can be made from |
| A. | ferritic stainless steel |
| B. | HSLA steel |
| C. | titanium |
| D. | austenitic stainless steel |
| Answer» C. titanium | |
| 6486. |
Materials having __________ lattice structure are usually the most ductile. |
| A. | body centred cubic (bcc) |
| B. | hexagonal close packed (hcp) |
| C. | face centred cubic (fcc) |
| D. | none of these |
| Answer» D. none of these | |
| 6487. |
Shampoos are commercially not available in the form of |
| A. | powder |
| B. | gaseous mixture |
| C. | solution |
| D. | emulsion |
| Answer» C. solution | |
| 6488. |
A gas which is collected over water becomes moistened due to water vapor, exerts its own partial pressure at the gas temperature, which is termed as its |
| A. | aqueous tension. |
| B. | saturated humidity. |
| C. | vapor pressure. |
| D. | absolute humidity. |
| Answer» B. saturated humidity. | |
| 6489. |
In "Imperial Smelting Process" for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following : |
| A. | Jet of water at high pressure. |
| B. | Blast of air. |
| C. | Mixture of water and air. |
| D. | Rain of molten lead. |
| Answer» E. | |
| 6490. |
Color of brass changes from yellow to __________ after its dezincification which exemplifies selective leaching. |
| A. | grey |
| B. | red |
| C. | orange |
| D. | violet |
| Answer» C. orange | |
| 6491. |
Heat dissipation in cooling towers is mainly by |
| A. | conduction |
| B. | convection |
| C. | evaporation |
| D. | radiation |
| Answer» D. radiation | |
| 6492. |
In BOF, desiliconisation is a first order reaction. So the silicon content of the metal decreases |
| A. | linearly with time. |
| B. | exponentially with time. |
| C. | logarithmically with time. |
| D. | in proportion to the square root of time. |
| Answer» B. exponentially with time. | |
| 6493. |
Filler metal is used in __________ welding. |
| A. | braze |
| B. | electric spot |
| C. | projection |
| D. | seam |
| Answer» B. electric spot | |
| 6494. |
Acetylene should never be conveyed through __________ pipe, as it forms an unstable compound that dissociates violently at the slightest shock. |
| A. | stainless steel |
| B. | copper |
| C. | aluminium |
| D. | brass |
| Answer» C. aluminium | |
| 6495. |
Which of the following contains the least percentage of carbon ? |
| A. | Pig iron |
| B. | Wrought iron |
| C. | Cast iron |
| D. | Malleable iron |
| Answer» C. Cast iron | |
| 6496. |
Electric arc furnace is employed mainly for the production of __________ steel. |
| A. | high carbon |
| B. | alloy |
| C. | mild |
| D. | plain carbon |
| Answer» C. mild | |
| 6497. |
Heat treatment of steel is done mainly to change its |
| A. | mechanical properties. |
| B. | physical properties, |
| C. | chemical composition. |
| D. | all 'a', 'b' & 'c'. |
| Answer» B. physical properties, | |
| 6498. |
'End cooler' or 'after cooler' is employed in air compressor mainly to |
| A. | remove oil vapour or moisture from air. |
| B. | cool the dry air before use. |
| C. | reduce the volumetric capacity of receiver. |
| D. | none of these. |
| Answer» B. cool the dry air before use. | |
| 6499. |
Streaklines, streamlines & pathlines are almost identical for __________ fluid flow. |
| A. | ideal |
| B. | uniform |
| C. | steady |
| D. | none of these |
| Answer» D. none of these | |
| 6500. |
The suction and delivery pressure for a two stage compressor are 1 and 25 atm respectively. The intermediate stage pressure would be around __________ atm. |
| A. | 5 |
| B. | 10 |
| C. | 15 |
| D. | 20 |
| Answer» B. 10 | |