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.
| 6351. |
Factor of safety is the ratio of the __________ stress to the working stress. |
| A. | tensile |
| B. | compressive |
| C. | yield |
| D. | bearing |
| Answer» D. bearing | |
| 6352. |
The majority charge carriers in p-type silicon are |
| A. | free electrons |
| B. | ions |
| C. | conduction electrons |
| D. | holes |
| Answer» E. | |
| 6353. |
Referring to the periodic table of elements, it is found that with increasing atomic number. The atomic size in the same |
| A. | period increases. |
| B. | period decreases. |
| C. | group increases. |
| D. | both 'b' & 'c'. |
| Answer» E. | |
| 6354. |
With increase in __________ Knocking tendency in a spark ignition petrol engine decreases. |
| A. | supercharging |
| B. | wall temperature |
| C. | compression ratio |
| D. | engine speed |
| Answer» E. | |
| 6355. |
Between 230 and 370 C, blue brittleness is caused in mild steel because of the |
| A. | immobility of dislocation. |
| B. | strain-ageing. |
| C. | increase in Young's modulus. |
| D. | strain hardening. |
| Answer» C. increase in Young's modulus. | |
| 6356. |
Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of __________ gms of zinc per m2 of steel strip. |
| A. | 5-10 |
| B. | 1000-1500 |
| C. | 120-500 |
| D. | 1500-3000 |
| Answer» D. 1500-3000 | |
| 6357. |
Chlorine acts as a bleaching agent only in the presence of |
| A. | dry air |
| B. | pure oxygen |
| C. | moisture |
| D. | sunlight |
| Answer» D. sunlight | |
| 6358. |
Corona discharge is related to the operation of a/an |
| A. | induction motor. |
| B. | electrostatic precipitator. |
| C. | fast breeder reactor. |
| D. | magneto hydrodynamic generator (MHD). |
| Answer» C. fast breeder reactor. | |
| 6359. |
Plastics as a material of construction suffer from the drawback of low |
| A. | machinability |
| B. | density |
| C. | strength |
| D. | plastic deformation |
| Answer» D. plastic deformation | |
| 6360. |
Out of the following, the best material capable of withstanding shock & vibration without the danger of cracking is |
| A. | malleable iron |
| B. | grey cast iron |
| C. | chilled cast iron |
| D. | white cast iron |
| Answer» B. grey cast iron | |
| 6361. |
Fibrous fracture is normally encountered in the __________ materials. |
| A. | hard |
| B. | elastic |
| C. | ductile |
| D. | brittle |
| Answer» D. brittle | |
| 6362. |
Bad odour in sanitary latrines is reduced by periodically sprinkling |
| A. | bleaching powder. |
| B. | lime powder. |
| C. | aluminium sulphate. |
| D. | none of these. |
| Answer» C. aluminium sulphate. | |
| 6363. |
A dummy activity is used in PERT network to describe the |
| A. | precedence relationship. |
| B. | resource idleness. |
| C. | resource restriction. |
| D. | necessary time delay. |
| Answer» B. resource idleness. | |
| 6364. |
Which of the following is not a characteristic observed in material failure by fatigue fracture ? |
| A. | Plastic deformation of material does not occur. |
| B. | Initiation of crack from below the surface does not occur. |
| C. | Initation of crack occurs on the surface of the machine part. |
| D. | Presence of both rough & smooth zone with conchoidal markings in smooth zone of the surface. |
| Answer» C. Initation of crack occurs on the surface of the machine part. | |
| 6365. |
A polymer is termed as an 'elastomer', if its percentage elongation is more than 100%. An elastomer is termed as 'rubber' if its percentage elongation is more than __________ percent. |
| A. | 150 |
| B. | 200 |
| C. | 300 |
| D. | 400 |
| Answer» C. 300 | |
| 6366. |
Current employed in resistance welding ranges from __________ kVA/cm2 . |
| A. | 1.2 to 2.5 |
| B. | 4.5 to 6.2 |
| C. | 7.5 to 8.5 |
| D. | 10.5 to 15.5 |
| Answer» C. 7.5 to 8.5 | |
| 6367. |
__________ has the highest melting point out of the following. |
| A. | Tungsten |
| B. | Zirconium |
| C. | Molybdenum |
| D. | Tantalum |
| Answer» B. Zirconium | |
| 6368. |
The only suitable method for hardening the low carbon steel is case hardening. Which of the following is a case hardening process? |
| A. | Cyaniding |
| B. | Sheardising |
| C. | Spherodising |
| D. | None of these |
| Answer» B. Sheardising | |
| 6369. |
Annealing of cast iron |
| A. | softens it to facilitate machining. |
| B. | decreases the free carbon. |
| C. | increases the strength. |
| D. | none of these. |
| Answer» B. decreases the free carbon. | |
| 6370. |
'Cryogenics' is concerned with the generation & use of low temperature in the range of |
| A. | 0 K to 123 K |
| B. | 0 C to - 123 C |
| C. | 0 C to - 273 C |
| D. | 0 K to 273 K |
| Answer» B. 0 C to - 123 C | |
| 6371. |
The capacity of a spring to store energy is called the spring form co-efficient. Stiffness of a spring is measured by the |
| A. | ability to absorb shock. |
| B. | capacity to store energy. |
| C. | ratio of the wire & coil diameters. |
| D. | load to produce unit deflection. |
| Answer» E. | |
| 6372. |
Which of the following materials has the maximum shrinkage allowance ? |
| A. | Brass |
| B. | Cast iron |
| C. | Lead |
| D. | Aluminium alloy |
| Answer» D. Aluminium alloy | |
| 6373. |
Vibration upto 100 kilo hertz can be most accurately measured by a __________ type accelerometer. |
| A. | preloaded spring |
| B. | piezoelectric |
| C. | bonded strain gauge |
| D. | none of these |
| Answer» C. bonded strain gauge | |
| 6374. |
Out of the following, the rays having the lowest wavelength is the |
| A. | radio waves |
| B. | ultrasonic waves |
| C. | infra red rays |
| D. | X-rays |
| Answer» B. ultrasonic waves | |
| 6375. |
A fine grained grinding wheel should not be used for grinding __________ materials. |
| A. | hard |
| B. | brittle |
| C. | soft & ductile |
| D. | none of these |
| Answer» D. none of these | |
| 6376. |
What is the effect on the performance of the economiser in the thermal power plant boiler, if the feed water temperature is very low due to preheaters being out for repairs or starving of steam supply ? |
| A. | It results in corrosion due to the condensation on the flue gas side of the economiser tubes due to handling of low temperature water. |
| B. | Economiser tube life increases due to handling of low temperature water. |
| C. | Heat transfer efficiency of economiser increases due to picking up high heat from the flue gases. |
| D. | Scale formation rate on economiser tubes increases. |
| Answer» B. Economiser tube life increases due to handling of low temperature water. | |
| 6377. |
A boy weighing 110lb climbs up a 50 ft high vertical destination in 100 seconds. Horse power of the boy is __________ hp. |
| A. | 0.1 |
| B. | 0.5 |
| C. | 0.8 |
| D. | 1 |
| Answer» B. 0.5 | |
| 6378. |
Endurance is a measure of fatigue limit of a metal. Fatigue crack in nitrided machine parts originates |
| A. | at the surface. |
| B. | within the core. |
| C. | just below the surface. |
| D. | anywhere on the surface. |
| Answer» C. just below the surface. | |
| 6379. |
Carbon percentage in high speed steel tool material is 0.6 to 1.0. The hardness of carbon tool steels is increased, when it is alloyed with |
| A. | vanadium & chromium |
| B. | silicon |
| C. | tungsten |
| D. | manganese |
| Answer» B. silicon | |
| 6380. |
Draft allowance given to patterns is for |
| A. | compensating the liquid state shrinkage. |
| B. | easy removal of pattern from the mold cavity. |
| C. | providing support for the core placement. |
| D. | compensating the solidification shrinkage. |
| Answer» C. providing support for the core placement. | |
| 6381. |
Which of the following welding processes employs the highest welding temperature ? |
| A. | Arc welding |
| B. | Gas welding |
| C. | Thermit welding |
| D. | Resistance welding |
| Answer» E. | |
| 6382. |
The velocity at which individual particles from a fluidised bed are carried away by the fluid passing through it, is defined as the |
| A. | minimum fluidisation velocity. |
| B. | terminal velocity. |
| C. | elutriation velocity. |
| D. | superficial velocity. |
| Answer» D. superficial velocity. | |
| 6383. |
The predominant mode of heat transfer which takes place from boiler furnace to water walls of a boiler is |
| A. | conduction |
| B. | convection |
| C. | both'a' & 'b' |
| D. | radiation |
| Answer» E. | |
| 6384. |
Which of the following is an inedible oil ? |
| A. | Corn oil |
| B. | Tallow oil |
| C. | Olive oil |
| D. | Cotton seed oil |
| Answer» C. Olive oil | |
| 6385. |
Light year is the unit of |
| A. | distance |
| B. | time |
| C. | intensity of light |
| D. | none of these |
| Answer» B. time | |
| 6386. |
Ingrannular corrosion occurs __________ stainless steel. |
| A. | in all types of steels except |
| B. | at the surface of |
| C. | along grain boundaries of |
| D. | in the core of |
| Answer» D. in the core of | |
| 6387. |
In case of fluid moving machineries, the relationship between saturation temperature and pressure decides the process of |
| A. | water hammer |
| B. | cavitation |
| C. | flow separation |
| D. | turbulent mixing |
| Answer» C. flow separation | |
| 6388. |
Other parameters remaining same, the recrystallisation temperature of an alloy is lowered, when |
| A. | strain rate is increased. |
| B. | grain size is increased. |
| C. | prior cold deformation is increased. |
| D. | not affected by any of the above parameters. |
| Answer» B. grain size is increased. | |
| 6389. |
On being hit with a hammer, __________ will readily fracture. |
| A. | brass |
| B. | mild steel |
| C. | cast iron |
| D. | lead |
| Answer» D. lead | |
| 6390. |
Which of the following does not discharge the dust collected as a dry solid ? |
| A. | Electrostatic precipitator |
| B. | Wet scrubber |
| C. | Bag filter |
| D. | Gravity settling chamber |
| Answer» C. Bag filter | |
| 6391. |
Window panes of aeroplanes are normally made of |
| A. | perspex (PMMA) |
| B. | teflon (PTFE) |
| C. | bakelite (phenol formaldehyde) |
| D. | polystyrene |
| Answer» B. teflon (PTFE) | |
| 6392. |
In TIG welding, thoriated tungsten electrodes are used, because it |
| A. | has higher current carraying capacity. |
| B. | has better electron emissivity. |
| C. | is stronger than ordinary tungsten. |
| D. | is easy to prepare. |
| Answer» C. is stronger than ordinary tungsten. | |
| 6393. |
Vernier calipers can not 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. | |
| 6394. |
Which of the following is not the commercial name of polymethyl-methacrylate (PMMA) ? |
| A. | Styrofoam |
| B. | Lucite |
| C. | Perspex |
| D. | Plexiglass |
| Answer» B. Lucite | |
| 6395. |
__________ flux is used for the extraction of metal from its self fluxing ores. |
| A. | No |
| B. | Acid |
| C. | Basic |
| D. | Neutral |
| Answer» B. Acid | |
| 6396. |
Good design of the casing of a centrifugal pump aims at minimising the |
| A. | cavitation |
| B. | frictional losses |
| C. | kinetic energy loss |
| D. | static head |
| Answer» D. static head | |
| 6397. |
Addition of beryllium to copper is done mainly to produce a/an __________ alloy. |
| A. | non-sparking & non-magnetic |
| B. | high strength |
| C. | precipitation hardenable |
| D. | corrosion resistant |
| Answer» B. high strength | |
| 6398. |
The product out from a cupola is called |
| A. | wrought iron |
| B. | pig iron |
| C. | cast iron |
| D. | none of these |
| Answer» D. none of these | |
| 6399. |
Resilience of a material is important, when it is subjected to |
| A. | creep |
| B. | fatigue |
| C. | shock loading |
| D. | galvanising |
| Answer» D. galvanising | |
| 6400. |
Existence of velocity potential implies that the fluid is |
| A. | irrotational |
| B. | ideal |
| C. | compressible |
| D. | in continuum |
| Answer» B. ideal | |