MCQOPTIONS
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MCQOPTIONS
This section includes 2253 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1551. |
As per international norms, the maximum permissible value of noise level in the industrial environment is __________ decibels as measured at a distance of 1.5 metres from the source of noise. |
| A. | 110 |
| B. | 85 |
| C. | 60 |
| D. | 45 |
| Answer» C. 60 | |
| 1552. |
Cassiterite is an ore of |
| A. | tin |
| B. | lead |
| C. | molybdenum |
| D. | chromium |
| Answer» B. lead | |
| 1553. |
For an ideal gas, Cp - Cv is |
| A. | R |
| B. | -R |
| C. | 0 |
| D. | (3/2) R |
| Answer» B. -R | |
| 1554. |
Thermal equivalent of electrical power in practical calculation is __________ kcal/kWh. |
| A. | 746 |
| B. | 3000 |
| C. | 1000 |
| D. | 550 |
| Answer» C. 1000 | |
| 1555. |
Temper brittleness of a material can be fairly detected by the __________ test. |
| A. | fatigue |
| B. | notched bar impact |
| C. | tensile |
| D. | hardness |
| Answer» C. tensile | |
| 1556. |
In an isochoric process, |
| A. | there is no transfer of mass and energy. |
| B. | free expansion of an ideal gas occurs. |
| C. | no mechanical work is done by the system. |
| D. | all 'a', 'b' & 'c'. |
| Answer» D. all 'a', 'b' & 'c'. | |
| 1557. |
Which of the following is a synthetic abrasive ? |
| A. | Corundum |
| B. | Emery |
| C. | Pumice |
| D. | Silicon carbide |
| Answer» E. | |
| 1558. |
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. | |
| 1559. |
The surface tension of a liquid, at critical temperature is |
| A. | indeterminate. |
| B. | zero. |
| C. | infinity. |
| D. | same as that at any other temperature. |
| Answer» C. infinity. | |
| 1560. |
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). | |
| 1561. |
On decreasing the grain size of a polycrys-talline material, the property most likely to deteriorate is |
| A. | creep |
| B. | toughness |
| C. | tensile strength |
| D. | fatigue |
| Answer» C. tensile strength | |
| 1562. |
Swaging is a/an __________ operation. |
| A. | piercing |
| B. | forging |
| C. | extrusion |
| D. | drawing |
| Answer» C. extrusion | |
| 1563. |
1% concentration of water vapor in air is equivalent to __________ ppm (parts per million). |
| A. | 10000 |
| B. | 1000 |
| C. | 100 |
| D. | 10 |
| Answer» B. 1000 | |
| 1564. |
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 | |
| 1565. |
Which of the following metals is not subjected to electrolytic refinning/purification? |
| A. | Copper |
| B. | Zinc |
| C. | Tin |
| D. | Aluminium |
| Answer» D. Aluminium | |
| 1566. |
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 | |
| 1567. |
Dowtherm is a |
| A. | high temperature heating medium (a petroleum product). |
| B. | product of coal tar distillation. |
| C. | very heat sensitive material. |
| D. | none of these. |
| Answer» B. product of coal tar distillation. | |
| 1568. |
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 | |
| 1569. |
Which of the following is not a charge material for cupola ? |
| A. | Limestone |
| B. | Iron scrap |
| C. | Iron ore |
| D. | Pig iron |
| Answer» D. Pig iron | |
| 1570. |
Which of the following is a disaccharide? |
| A. | Lactose |
| B. | Starch |
| C. | Cellulose |
| D. | Fructose |
| Answer» B. Starch | |
| 1571. |
Scab is a defect developed during __________ of metals. |
| A. | forging |
| B. | sand casting |
| C. | machining |
| D. | welding |
| Answer» C. machining | |
| 1572. |
__________ is the process used for setting up compressive stresses in the surface of a metal to improve its fatigue strength. |
| A. | Lancing |
| B. | Shot peening |
| C. | Slugging |
| D. | Spinning |
| Answer» C. Slugging | |
| 1573. |
Function of fusible plug in a boiler is to |
| A. | drain out water and sludge from the boiler during repair. |
| B. | put off fire in the furnace when water level in the boiler falls to unsafe limit. |
| C. | guard the boiler in case of abnormal rise in steam pressure. |
| D. | all (a), (b) & (c). |
| Answer» C. guard the boiler in case of abnormal rise in steam pressure. | |
| 1574. |
For infinite parallel planes having emis-sivities ε1 & ε2, the interchange factor for radiation from surface 1 to surface 2 is given by$ |
| A. | (ε1 + ε2)/ε1.ε2 |
| B. | ε1.ε2/(ε1 + ε2 - ε1.ε2) |
| C. | ε1.ε2 |
| D. | ε1 + ε2 |
| Answer» C. Œµ1.Œµ2 | |
| 1575. |
Stretcher strains found in a low carbon sheet are associated with the |
| A. | texture. |
| B. | dislocation density. |
| C. | yield point phenomenon. |
| D. | thickness of the sheet. |
| Answer» D. thickness of the sheet. | |
| 1576. |
Nitrogen is not an essential component of |
| A. | protein |
| B. | urea |
| C. | oils & fats |
| D. | any of these |
| Answer» D. any of these | |
| 1577. |
Which of the following are made out of the carbon steel having carbon content of 0.9 to 1% ? |
| A. | Small punches, broaches reamers and springs. |
| B. | Cutlery, screws, rivets and files. |
| C. | Mandrels, twist drills, small lathe tools and razors. |
| D. | Forgings like can shaft, structural steel plate, threading dies and drawing dies. |
| Answer» B. Cutlery, screws, rivets and files. | |
| 1578. |
Sacrificial anode method is used in the protection of pipelines which are buried underground. Sacrificial anode |
| A. | occurs higher in the electro-chemical series of metals. |
| B. | is exemplified by magnesium plate. |
| C. | is much cheaper than the cathodic base material to be guarded against corrosion. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 1579. |
The excess air required for the combustion of pulverised coal is of the order of about __________ percent. |
| A. | 5 |
| B. | 15 |
| C. | 30 |
| D. | 45 |
| Answer» C. 30 | |
| 1580. |
Refrigerative cooling employed during long distance transportation of food stuffs is normally done by |
| A. | ice |
| B. | liquid nitrogen |
| C. | liquid oxygen |
| D. | vacuum evaporation |
| Answer» C. liquid oxygen | |
| 1581. |
Which of the following heat treatment processes is usually applied to castings ? |
| A. | Tempering |
| B. | Annealing |
| C. | Normalising |
| D. | Carburising |
| Answer» E. | |
| 1582. |
Stress and strain are related by __________ elastic constants for a linearly elastic, homogeneous & isotropic material. |
| A. | one |
| B. | two |
| C. | three |
| D. | four |
| Answer» C. three | |
| 1583. |
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 | |
| 1584. |
During decarburising of a plain carbon steel, the thickness of ferrite layer growth is proportional to |
| A. | time |
| B. | square root of time |
| C. | square of time |
| D. | cube of time |
| Answer» C. square of time | |
| 1585. |
Age hardening is connected with |
| A. | babbit metal |
| B. | gun metal |
| C. | stainless steel |
| D. | duralumin |
| Answer» E. | |
| 1586. |
Recrystallisation temperature of steel is __________ °C.$ |
| A. | 50 |
| B. | 300 |
| C. | 500 |
| D. | 800 |
| Answer» E. | |
| 1587. |
Colour comparator is used to measure the |
| A. | pH value |
| B. | electrode potential |
| C. | colour intensity |
| D. | none of these |
| Answer» B. electrode potential | |
| 1588. |
A balanced draught boiler furnace employs __________ draught fan. |
| A. | induced |
| B. | forced |
| C. | both 'a' & 'b' |
| D. | neither 'a' nor 'b' |
| Answer» D. neither 'a' nor 'b' | |
| 1589. |
Heat required to raise the temperature of a body by 1 °C is called its$ |
| A. | heat capacity. |
| B. | specific heat capacity. |
| C. | thermal conductivity. |
| D. | water equivalent. |
| Answer» B. specific heat capacity. | |
| 1590. |
Thermal efficiency of an internal combustion engine is around __________ percent. |
| A. | 8 |
| B. | 35 |
| C. | 65 |
| D. | 80 |
| Answer» C. 65 | |
| 1591. |
The heat treatment to which the steel wire containing > 0.25% carbon is subjected to is |
| A. | full annealing |
| B. | bright annealing |
| C. | patenting |
| D. | none of these |
| Answer» D. none of these | |
| 1592. |
Ferrites are __________ magnetic. |
| A. | anti |
| B. | para |
| C. | ferri |
| D. | ferro |
| Answer» D. ferro | |
| 1593. |
__________ strain gauge is the most sensitive sensing element for strain measurement. |
| A. | photoelastic |
| B. | semiconductor |
| C. | wire resistance |
| D. | none of these |
| Answer» C. wire resistance | |
| 1594. |
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 | |
| 1595. |
Nitriding of a steel part does not increase its |
| A. | grain size. |
| B. | fatigue limit. |
| C. | surface hardness. |
| D. | wear resistance. |
| Answer» B. fatigue limit. | |
| 1596. |
Oxygen content below __________ percent in air contaminated with nitrogen does not support combustion and is unsafe for humane exposure. |
| A. | 18 |
| B. | 16 |
| C. | 14 |
| D. | 12 |
| Answer» C. 14 | |
| 1597. |
Normalising of an object does not |
| A. | refine coarse grain structure obtained during hot working. |
| B. | improve ductility. |
| C. | improve yield strength. |
| D. | improve machanical properties. |
| Answer» C. improve yield strength. | |
| 1598. |
Lime contains about 90% CaO. Percentage CaO present in limestone is about |
| A. | 25 |
| B. | 50 |
| C. | 70 |
| D. | 80 |
| Answer» C. 70 | |
| 1599. |
Elimination of brittleness resulting from welding of saw blades is done by __________ of the welded portion. |
| A. | annealing |
| B. | toughening |
| C. | work hardening |
| D. | tempering |
| Answer» B. toughening | |
| 1600. |
Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing 50 wt% B is |
| A. | R ln 2 |
| B. | -R ln 2 |
| C. | 3 R ln 2 |
| D. | -3R ln 2 |
| Answer» B. -R ln 2 | |