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.
| 6551. |
The maximum axial compression stress during cold upsetting of a cylinderical rod of radius (r) occurs at |
| A. | the outer edge of the rod. |
| B. | r/3 from the centre. |
| C. | r/2 from the centre. |
| D. | the centre. |
| Answer» E. | |
| 6552. |
Electrode potential is not concerned with the measurment of |
| A. | pH value |
| B. | temperature |
| C. | viscosity |
| D. | density |
| Answer» C. viscosity | |
| 6553. |
__________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction. |
| A. | Packed |
| B. | Bubble |
| C. | Spray |
| D. | Tray |
| Answer» D. Tray | |
| 6554. |
Tungsten in high speed steel is responsible for its |
| A. | toughness & wear resistance |
| B. | cold hardness |
| C. | hot hardness |
| D. | sharp cutting edge |
| Answer» D. sharp cutting edge | |
| 6555. |
The phenomenon of strain-ageing is generally experienced with |
| A. | cast iron. |
| B. | low carbon steel. |
| C. | high manganese steel. |
| D. | high carbon steel. |
| Answer» C. high manganese steel. | |
| 6556. |
The capacity of a material to absorb energy depends upon both its strength & stiffness. The term 'stiffness' of a material is the opposite of its |
| A. | flexibility |
| B. | plasticity |
| C. | hardness |
| D. | hardenability |
| Answer» B. plasticity | |
| 6557. |
Filler metal is not used in the __________ welding. |
| A. | seam |
| B. | electric spot |
| C. | projection |
| D. | all a, b & c |
| Answer» E. | |
| 6558. |
Sudden immersion/dipping of red hot steel bar in water makes it |
| A. | malleable & tough. |
| B. | ductile & soft. |
| C. | brittle & hard. |
| D. | none of these. |
| Answer» D. none of these. | |
| 6559. |
A thermally thin body is the one for which |
| A. | Biot number is less than 0.1. |
| B. | Gallileo number is less than 0.1. |
| C. | Fourier number is less than 0.1. |
| D. | Fourier number is greater than 0.1. |
| Answer» B. Gallileo number is less than 0.1. | |
| 6560. |
Air refrigeration cycle is used in the air crafts, because of |
| A. | low temperature encountered at high altitude. |
| B. | its high heat transfer rate. |
| C. | its low unit weight per ton of refrigeration. |
| D. | its higher co-efficient of performance (COP). |
| Answer» D. its higher co-efficient of performance (COP). | |
| 6561. |
Failure of a material is attributed to __________ if it fails below its yield point. |
| A. | impact loading |
| B. | fatigue |
| C. | creep |
| D. | straining |
| Answer» C. creep | |
| 6562. |
Protection of ship hulls against sea water corrosion is done by coating with zinc because of the fact that zinc compared to iron is |
| A. | reduced preferentially. |
| B. | cheaper. |
| C. | oxidised preferentially. |
| D. | lighter. |
| Answer» D. lighter. | |
| 6563. |
Which of the following pairs regarding the effect of alloying elements in steels are not matched correctly ? |
| A. | Cobalt: It contributes to rerl hardness by hardening ferrite. |
| B. | Molybdenum: It forms abrasion resisting particles. |
| C. | Phosphorous: It improves machinability in free cutting steels. |
| D. | Silicon: It reduces oxidation resistance. |
| Answer» B. Molybdenum: It forms abrasion resisting particles. | |
| 6564. |
Heat transfer by radiation from a hot body will be most rapid, if its surface is __________ because of its higher emissivity. |
| A. | white & rough |
| B. | black & rough |
| C. | white & polished |
| D. | black & polished |
| Answer» C. white & polished | |
| 6565. |
Reduction reaction involves the |
| A. | loss of electrons. |
| B. | increase in oxidation number. |
| C. | gain of electrons. |
| D. | addition of oxygen. |
| Answer» D. addition of oxygen. | |
| 6566. |
Specific heat of an ideal gas depends upon its |
| A. | molecular weight |
| B. | pressure |
| C. | temperature |
| D. | volume |
| Answer» D. volume | |
| 6567. |
A __________ type pressure sensing element is commonly used in aneroid barometer. |
| A. | capsule |
| B. | bellow |
| C. | spiral tube |
| D. | flat diaphragm |
| Answer» B. bellow | |
| 6568. |
The routing function in a production system design is concerned with the |
| A. | material flow optimisation through the plant. |
| B. | machine utilisation. |
| C. | quality control of the product. |
| D. | manpower utilisation. |
| Answer» C. quality control of the product. | |
| 6569. |
Filler material used in welding having the lowest melting point out of the following is |
| A. | aluminium |
| B. | soft solder |
| C. | silver solder |
| D. | brazing spelter |
| Answer» C. silver solder | |
| 6570. |
Which of the following has the highest density and the lowest melting point ? |
| A. | Stainless steel |
| B. | Titanium |
| C. | Lead |
| D. | Aluminium |
| Answer» D. Aluminium | |
| 6571. |
Electrolytes conduct electric current by |
| A. | the movement of ions. |
| B. | the movement of molecules. |
| C. | allowing electrons to flow through them from cathode to anode. |
| D. | movement of electric charge through them. |
| Answer» B. the movement of molecules. | |
| 6572. |
Gas carrying pipelines are best joined by |
| A. | nuts & bolts |
| B. | rivetting |
| C. | welding |
| D. | none of these |
| Answer» D. none of these | |
| 6573. |
The ability of a substance to assume two or more crystalline structure is called |
| A. | isomorphism |
| B. | polymorphism |
| C. | amorphism |
| D. | isomerism |
| Answer» C. amorphism | |
| 6574. |
The main function of the deaerator used in the thermal power plant is to |
| A. | throttle down the steam pressure. |
| B. | enhance feed water temperature. |
| C. | remove dissolved gases from feed-water. |
| D. | remove non-condensable gases from condenser. |
| Answer» D. remove non-condensable gases from condenser. | |
| 6575. |
Lubricants can be used to |
| A. | transmit power hydraulically. |
| B. | form a seal in compressors. |
| C. | remove contaminants by flushing and to insulate transformers, switchgears etc. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 6576. |
Paint spray gun works on the principle of |
| A. | Bernoulli's theorem. |
| B. | Boyle's law. |
| C. | Newton's law of viscosity. |
| D. | none of these. |
| Answer» B. Boyle's law. | |
| 6577. |
An orthotropic material is a special class of anisotropic material, which is described by their properties in three perpendicular directions. An example of orthotropic material is |
| A. | stainless steel |
| B. | cast iron |
| C. | wood |
| D. | teflon |
| Answer» D. teflon | |
| 6578. |
pH value of rain water in India ranges from |
| A. | 5.5 to 7.5 |
| B. | 8 to 9.5 |
| C. | 3.5 to 5 |
| D. | 9.5 to 10.5 |
| Answer» B. 8 to 9.5 | |
| 6579. |
The capital & running costs of similar machines having unequal service life can be compared by the __________ method. |
| A. | equivalant annual cost |
| B. | rate of return |
| C. | present net worth |
| D. | capitalised cost |
| Answer» E. | |
| 6580. |
Pick the odd man out. |
| A. | Austempering |
| B. | Martempering |
| C. | Cyniding |
| D. | Parkerizing |
| Answer» E. | |
| 6581. |
Ester is formed, when an alcohol reacts with |
| A. | carboxylic acid |
| B. | aldehyde |
| C. | ketone |
| D. | ether |
| Answer» B. aldehyde | |
| 6582. |
Which of the following accounts for maximum loss of energy in a coal fired boiler ? |
| A. | Incomplete combustion of fuel. |
| B. | Outgoing flue gases. |
| C. | Radiation heat losses. |
| D. | Unburnt carbon in ash. |
| Answer» C. Radiation heat losses. | |
| 6583. |
Presence of sulphur in the fuel fired in a furnace |
| A. | contributes to its heating value. |
| B. | helps in electrostatic precipitation of ash from flue gases. |
| C. | corrodes ducts & air preheater, if the flue gas temperature is low. |
| D. | all 'a' , 'b' & 'c'. |
| Answer» E. | |
| 6584. |
Boiling temperature of carbon dioxide at atmospheric pressure is __________ C. |
| A. | -30.5 |
| B. | -78.5 |
| C. | -183.5 |
| D. | -10.5 |
| Answer» C. -183.5 | |
| 6585. |
Eutectoid reaction for iron-carbon system occurs at a temperature of __________ C. |
| A. | 597 |
| B. | 959 |
| C. | 1147 |
| D. | 1493 |
| Answer» E. | |
| 6586. |
Scab is a defect developed during __________ of metals. |
| A. | forging |
| B. | sand casting |
| C. | machining |
| D. | welding |
| Answer» C. machining | |
| 6587. |
A floating body oscillates about its __________ when it is displaced slightly. |
| A. | centre of gravity |
| B. | metacentre |
| C. | centre of buoyancy |
| D. | centre of pressure |
| Answer» C. centre of buoyancy | |
| 6588. |
Which of the following relatively employs the highest heat transfer surface area in a high pressure boiler ? |
| A. | Airpreheater |
| B. | Economiser |
| C. | Steam superheater |
| D. | Furnace water wall |
| Answer» B. Economiser | |
| 6589. |
A material expanding freely due to heating will develop __________ stress. |
| A. | no |
| B. | compressive |
| C. | tensile |
| D. | thermal |
| Answer» B. compressive | |
| 6590. |
A machine having assumed life of 20 years is purchased for Rs 32000/-. Its scrap value at the end of its life is Rs 8000/-. If the depreciation is calculated by diminishing balance method, then percentage reduction in its value at the end of first year is __________ percent. |
| A. | 6.7 |
| B. | 7.6 |
| C. | 10.3 |
| D. | 15.2 |
| Answer» B. 7.6 | |
| 6591. |
More than 1000 tons refrigeration capacity plants are usually of __________ type. |
| A. | vapour compression |
| B. | vapour absorption |
| C. | air refrigeration |
| D. | none of these |
| Answer» C. air refrigeration | |
| 6592. |
The activity co-efficient of the solute in a dilute solution |
| A. | decreases with the increase of concentration of the solute. |
| B. | increases with the increase of concentration of the solute. |
| C. | remains constant. |
| D. | is unity at infinite dilution. |
| Answer» D. is unity at infinite dilution. | |
| 6593. |
Constituents of stellite are |
| A. | zinc, copper & nickel. |
| B. | cobalt, chromium & tungsten. |
| C. | zinc, aluminium & nickel. |
| D. | nickel, cobalt & vanadium. |
| Answer» C. zinc, aluminium & nickel. | |
| 6594. |
The kinematic viscosity (in stoke) and the absolute/dynamic viscosity (in poise) are the same for __________ at room temperature. |
| A. | air |
| B. | water |
| C. | mercury |
| D. | alcohol |
| Answer» C. mercury | |
| 6595. |
Multistage compression is necessary for high efficiency, |
| A. | if the ratio of the delivery pressure to the intake pressure exceeds 5:1. |
| B. | when large amount of gas is to be compressed. |
| C. | when the delivered gas is desired at very high velocity. |
| D. | none of these |
| Answer» B. when large amount of gas is to be compressed. | |
| 6596. |
__________ can not increase the fatigue strength of a material. |
| A. | Grain refining |
| B. | Grain coarsening |
| C. | Surface hardening |
| D. | Shot peening |
| Answer» C. Surface hardening | |
| 6597. |
Work hardenable alloy steel used to make the bucket wheel excavators, blades of bulldozers and other earth moving equipments contain iron, carbon and |
| A. | manganese |
| B. | silicon |
| C. | nickel |
| D. | chromium |
| Answer» B. silicon | |
| 6598. |
Electrometallurgy is not involved in the extraction of __________ from its ore. |
| A. | aluminium |
| B. | tin |
| C. | lead |
| D. | both(b) & (c) |
| Answer» E. | |
| 6599. |
A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through it, because it heats up the crystals & breaks the covalant bonds resulting in __________ electrons. |
| A. | lack of free |
| B. | excess of |
| C. | decrease in |
| D. | none of these |
| Answer» C. decrease in | |
| 6600. |
Dew point temperature always gives an indication of the __________ of the moist air. |
| A. | dryness |
| B. | moisture content |
| C. | coolness |
| D. | latent heat |
| Answer» C. coolness | |