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.
| 6601. |
For a first order chemical reaction, the concentration of the reactant decreases __________ with time. |
| A. | linearly |
| B. | exponentially |
| C. | logarithmically |
| D. | inversely |
| Answer» B. exponentially | |
| 6602. |
Air standard Otto cycle is more efficient than the diesel cycle for the same |
| A. | heat addition & compression ratio. |
| B. | heat addition & pressure. |
| C. | compression ratio & pressure. |
| D. | cylinder dimension & rpm. |
| Answer» B. heat addition & pressure. | |
| 6603. |
Pipelines carrying various utilities in chemical industries are identified by their colour codes. The color of pipeline carrying steam is |
| A. | black |
| B. | silver grey |
| C. | green |
| D. | yellow |
| Answer» C. green | |
| 6604. |
What is the percentage of chromium in 18-4-1 high speed steel ? |
| A. | 1 |
| B. | 4 |
| C. | 18 |
| D. | 23 |
| Answer» D. 23 | |
| 6605. |
Preheating before welding is done to |
| A. | make the plate softer. |
| B. | burn oil & grease sticking to plate surfaces. |
| C. | avoid plate distortion. |
| D. | prevent cold cracks. |
| Answer» E. | |
| 6606. |
In case of brasses, with decreasing zinc percentage and increasing copper percentage, its __________ increases. |
| A. | percentage elongation |
| B. | brinell hardness |
| C. | tensile strength |
| D. | all 'a' , 'b' & 'c' |
| Answer» B. brinell hardness | |
| 6607. |
A suitable lubricant used for watches is |
| A. | metallic soap solution |
| B. | grease |
| C. | palm oil |
| D. | hazel-nut oil |
| Answer» E. | |
| 6608. |
Out of the following __________ iron has the best capability to bear sudden & excessive shocks. |
| A. | white |
| B. | cast |
| C. | wrought |
| D. | pig |
| Answer» D. pig | |
| 6609. |
Out of the following substances, one ton of __________ will store the maximum heat for a rise of 30 C in temperature. |
| A. | steel |
| B. | lignite |
| C. | water |
| D. | lime stone |
| Answer» D. lime stone | |
| 6610. |
In which of the following reactions, application of vacuum will help ? |
| A. | Number of gas molecules in the product side is more than that on the reactant side. |
| B. | Number of gas molecules in the reactant side is more than that on the product side. |
| C. | Number of gas molecules are the same on both the reactant & the product side. |
| D. | None of the above. |
| Answer» E. | |
| 6611. |
Inspection of surface and sub-surface cracks in non-magnetic alloys is done by __________ testing method. |
| A. | X-ray |
| B. | magnetic particle |
| C. | dye penetrant |
| D. | ultrasonic |
| Answer» D. ultrasonic | |
| 6612. |
Which of the following exemplifies resemblence with the extrusion process ? |
| A. | Pneumatic ejection of abrasive solid particles through a nozzle. |
| B. | Toothpaste pouring out of the tube. |
| C. | Ejection of abrasive slurry through an opening. |
| D. | Viscous lubricant pouring out through its container's mouth. |
| Answer» C. Ejection of abrasive slurry through an opening. | |
| 6613. |
LVDT used for displacement measurement is a/an __________ transducer. |
| A. | passive |
| B. | active |
| C. | capacitive |
| D. | none of these |
| Answer» B. active | |
| 6614. |
A static fluid can not have |
| A. | zero shear stress. |
| B. | positive normal stress. |
| C. | non-zero shear stress. |
| D. | none of these. |
| Answer» D. none of these. | |
| 6615. |
In a forced draft cooling tower, water is cooled from 95 to 80 F by exposure to air with a wet bulb temperature of 70 F. In this case, the |
| A. | range is 15 F. |
| B. | approach is 10 F. |
| C. | both (a) & (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 6616. |
The 'laughing gas' is |
| A. | nitrous oxide |
| B. | nitric oxide |
| C. | nitrogen trioxide |
| D. | nitrogen pentoxide |
| Answer» B. nitric oxide | |
| 6617. |
Coating provided on the electrodes used in the arc welding is not expected to |
| A. | add alloying elements. |
| B. | prevent electrode from contamination. |
| C. | stabilise the arc. |
| D. | provide protective atmosphere to weld. |
| Answer» C. stabilise the arc. | |
| 6618. |
Desalination of water |
| A. | makes it potable. |
| B. | makes it non-potable. |
| C. | means distillation of water. |
| D. | none of these. |
| Answer» B. makes it non-potable. | |
| 6619. |
Viscoelastic behaviour is observed in __________ materials. |
| A. | non-crystalline organic polymeric |
| B. | ceramic |
| C. | all crystalline |
| D. | all amorphous |
| Answer» B. ceramic | |
| 6620. |
Probability of cavitation occuring becomes very high, when the local __________ resulting in water bubbles formation, which on rupture cause cavitation |
| A. | pressure falls below the vapour pressure |
| B. | pressure becomes very high |
| C. | temperature becomes low |
| D. | all 'a', 'b' & 'c' |
| Answer» E. | |
| 6621. |
Which of the following materials has the poorest electrical conductivity ? |
| A. | Carbon |
| B. | Aluminium |
| C. | Silver |
| D. | Stainless steel |
| Answer» B. Aluminium | |
| 6622. |
Wheat is ground into flour in a |
| A. | hammer crusher |
| B. | roller crusher |
| C. | impact mill |
| D. | fluid energy mill |
| Answer» C. impact mill | |
| 6623. |
Gravity stamp mill is meant for the __________ crushing. |
| A. | primary |
| B. | intermediate |
| C. | fine |
| D. | ultrafine |
| Answer» D. ultrafine | |
| 6624. |
Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the |
| A. | density separation. |
| B. | differential wettability. |
| C. | size. |
| D. | volatile matter content. |
| Answer» B. differential wettability. | |
| 6625. |
Toothed roll crushers achieve size reduction by |
| A. | tearing (shear) and compression. |
| B. | impact and attrition. |
| C. | both (a) & (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 6626. |
Close circuit grinding by a ball mill with air sweeping employs a |
| A. | classifier. |
| B. | cyclone separator between mill & classifier. |
| C. | both (a) & (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 6627. |
Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with __________ to get the same for dry grinding. |
| A. | 1.0 |
| B. | 0.5 |
| C. | 1.34 |
| D. | 4.34 |
| Answer» D. 4.34 | |
| 6628. |
Choke crushing (in case of a Jaw crusher) compared to free crushing |
| A. | results in increased capacity. |
| B. | consumes less power. |
| C. | consumes more power. |
| D. | both (a) and (c). |
| Answer» D. both (a) and (c). | |
| 6629. |
Which of the following achieves the least reduction ratio for a given feed size? |
| A. | Jaw crusher |
| B. | Roll crusher |
| C. | Cone crusher |
| D. | Gyratory crusher |
| Answer» C. Cone crusher | |
| 6630. |
A fluid energy mill is used for |
| A. | cutting |
| B. | grinding |
| C. | ultragrinding |
| D. | crushing |
| Answer» D. crushing | |
| 6631. |
Filtration should be stopped in a filter press, if the |
| A. | cake becomes very dense. |
| B. | liquor stops flowing out to the discharge. |
| C. | filtration pressure rises suddenly. |
| D. | both(b)&(c). |
| Answer» E. | |
| 6632. |
For coarse reduction of hard solids, use |
| A. | impact |
| B. | attrition |
| C. | compression |
| D. | cutting |
| Answer» D. cutting | |
| 6633. |
In a size reduction crushing operation, feed size is 100 to 300 mm. while the product size is 10 to 50 mm. This is a case of the __________ crushing. |
| A. | primary |
| B. | secondary |
| C. | fine |
| D. | ultrafine |
| Answer» C. fine | |
| 6634. |
Soft & non-abrasive materials can be made into fines by |
| A. | attrition |
| B. | compression |
| C. | cutting |
| D. | none of these |
| Answer» B. compression | |
| 6635. |
In constant pressure filtration, |
| A. | resistance decreases with time |
| B. | rate of filtration is constant |
| C. | rate of filtration increases with time |
| D. | rate of filtration decreases with time |
| Answer» E. | |
| 6636. |
Which of the following minerals is not subjected to magnetic separation method? |
| A. | Rutile |
| B. | Galena |
| C. | Chromite |
| D. | Siderite |
| Answer» C. Chromite | |
| 6637. |
Which of the following is not a revolving/tumbling mill used for size reduction? |
| A. | Compartment mill |
| B. | Pebble mill |
| C. | Cage mill |
| D. | Rod mill |
| Answer» D. Rod mill | |
| 6638. |
To produce talcum powder, use |
| A. | ball mill |
| B. | hammer mill |
| C. | jet mill |
| D. | pin mill |
| Answer» B. hammer mill | |
| 6639. |
Angle of nip of the crushing rolls does not depend upon the |
| A. | diameter of the rolls |
| B. | speed of the rolls |
| C. | product size |
| D. | feed size |
| Answer» C. product size | |
| 6640. |
Paddle agitator |
| A. | is suitable for mixing low viscosity liquids. |
| B. | produces axial flow. |
| C. | moves at very high speed. |
| D. | none of these. |
| Answer» B. produces axial flow. | |
| 6641. |
Gummy & sticky materials like molasses, sugar etc. are best transported/handled by using a __________ conveyor. |
| A. | drag |
| B. | ribbon |
| C. | screw |
| D. | slat |
| Answer» C. screw | |
| 6642. |
Metallic wire mesh is used as a filtering medium for the separation of dust from dust laden gas in case of a/an |
| A. | air filter |
| B. | bag filter |
| C. | venturi scrubber |
| D. | hydrocyclones |
| Answer» B. bag filter | |
| 6643. |
Which of the following is a coarse crusher? |
| A. | Smooth roll crusher |
| B. | Toothed roll crusher |
| C. | Gyratory crusher |
| D. | Tube mill |
| Answer» D. Tube mill | |
| 6644. |
Sorting classifiers employing differential settling methods for separation of particles make use of the differences in their |
| A. | particle sizes |
| B. | densities |
| C. | terminal velocities |
| D. | none of these |
| Answer» D. none of these | |
| 6645. |
Separation of particles of various sizes, shapes and densities by allowing them to settle in a fluid is called |
| A. | classification |
| B. | froth floatation |
| C. | thickening |
| D. | clarification |
| Answer» B. froth floatation | |
| 6646. |
The specific cake resistance for incompressible sludges is (where P = pressure drop over cake) |
| A. | P |
| B. | 1/ P |
| C. | |
| D. | <span class="root"> P</span> |
| E. | independent of P |
| Answer» E. independent of P | |
| 6647. |
In a size reduction crushing operation, feed size is 300 to 1500 mm while the product size is 100 to 300 mm. This is a case of the __________ crushing. |
| A. | secondary |
| B. | fine |
| C. | primary |
| D. | ultrafine |
| Answer» D. ultrafine | |
| 6648. |
__________ is not a heat treatment process. |
| A. | Cyaniding |
| B. | Pakerising |
| C. | Austempering |
| D. | Martempering |
| Answer» C. Austempering | |
| 6649. |
An ingot is hot forged to a 60% reduction in cross-section area. The percentage reduction in the volume for the above process is |
| A. | 0 |
| B. | 60 |
| C. | 30 |
| D. | 20 |
| Answer» B. 60 | |
| 6650. |
Volute casing of a centrifugal pump does not facilitate |
| A. | uniform flow of fluid coming out of the impeller. |
| B. | increase in the pump efficiency. |
| C. | conversion of the part of the velocity head to the pressure head. |
| D. | conversion of the part of the pressure head to velocity head. |
| Answer» E. | |