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.
| 3001. |
Major component of flint glass is |
| A. | lead oxide |
| B. | silica |
| C. | alumina |
| D. | soda |
| Answer» B. silica | |
| 3002. |
Gypsum is chemically |
| A. | calcium chloride |
| B. | potassium sulphate |
| C. | sodium sulphate |
| D. | calcium sulphate |
| Answer» E. | |
| 3003. |
Phenol is mainly used |
| A. | to produce benzene. |
| B. | to produce phenol formaldehyde. |
| C. | to produce polyester resin. |
| D. | as a plasticiser for unsaturated polyster. |
| Answer» C. to produce polyester resin. | |
| 3004. |
Conversion of CO to CO2 by steam in presence of a catalyst is called |
| A. | steam reforming. |
| B. | shift conversion. |
| C. | steam gasification. |
| D. | none of these. |
| Answer» C. steam gasification. | |
| 3005. |
Solvent extracted oil |
| A. | has low free fatty acid content. |
| B. | is odourless. |
| C. | has more of unsaturates. |
| D. | none of these. |
| Answer» E. | |
| 3006. |
Which of the following is not required in the manufacture of soda ash by Solvay process ? |
| A. | Ammonia |
| B. | Limestone |
| C. | Nitric acid |
| D. | None of these |
| Answer» D. None of these | |
| 3007. |
Saponification number of an oil or fat |
| A. | gives an idea about its molecular weight. |
| B. | is inversely proportional to its molecular weight. |
| C. | detects its adulteration. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 3008. |
The purpose of tanning in leather industry is to |
| A. | stiffen the leather. |
| B. | smoothen the leather. |
| C. | make it flexible. |
| D. | impart water resistance. |
| Answer» B. smoothen the leather. | |
| 3009. |
Lime and soda ash are added to water to remove |
| A. | bicarbonates & sulphates of calcium and magnesium. |
| B. | undersirable taste and odour. |
| C. | bacteria. |
| D. | its corrosiveness. |
| Answer» B. undersirable taste and odour. | |
| 3010. |
__________ iron is the purest form of iron. |
| A. | Cast |
| B. | Wrought |
| C. | Pig |
| D. | High silicon |
| Answer» C. Pig | |
| 3011. |
Enamels |
| A. | give good glossy finish. |
| B. | are same as varnish. |
| C. | are prepared from non-drying oil. |
| D. | do not contain pigment. |
| Answer» B. are same as varnish. | |
| 3012. |
Sulphur removal by heating of pyrite ore in presence of air is called its |
| A. | reduction |
| B. | roasting |
| C. | calcination |
| D. | smelting |
| Answer» C. calcination | |
| 3013. |
Deacon's method is used for the manufacture of |
| A. | glauber's salt |
| B. | common salt |
| C. | chlorine |
| D. | graphite electrode |
| Answer» D. graphite electrode | |
| 3014. |
Pick out the true statement pertaining to water treatment. |
| A. | Slow sand filters can remove colour completely. |
| B. | Activated carbon can be used for taste & odour control without subsequent filtration. |
| C. | Application of activated carbon reduces the temporary hardness of water. |
| D. | Normally, the turbidity is removed by adding a coagulent prior to sedimentation. |
| Answer» E. | |
| 3015. |
The noble gas which occurs most abundantly in the atmosphere is |
| A. | helium |
| B. | neon |
| C. | krypton |
| D. | argon |
| Answer» E. | |
| 3016. |
Production of alcohol by fermentation of molasses is an __________ process. |
| A. | anaerobic |
| B. | aerobic |
| C. | endothermic |
| D. | both(b) and (c) |
| Answer» C. endothermic | |
| 3017. |
Main constituents of portland cement are calcium aluminate and |
| A. | gypsum |
| B. | silicates |
| C. | sodium silicate |
| D. | carbonates |
| Answer» C. sodium silicate | |
| 3018. |
Common salt is generally not produced commonly by __________ method from brine. |
| A. | freeze drying |
| B. | electrolytic |
| C. | solar evaporation |
| D. | vacuum evaporation |
| Answer» B. electrolytic | |
| 3019. |
DDT stands for |
| A. | diethyl-diphenyl-trichloromethane. |
| B. | dichloro-diphenyl-trichloromethane. |
| C. | diphenyl-dichloro-trichloromethane. |
| D. | dichloro-diphenyl-trichloroethane. |
| Answer» E. | |
| 3020. |
Phosphoric acid is prepared from |
| A. | cryolite |
| B. | chalcopyrite |
| C. | rock phosphate |
| D. | none of these |
| Answer» D. none of these | |
| 3021. |
Metallic soap (e.g. aluminium or calcium salts of fatty acids) can be used |
| A. | as a lubricant. |
| B. | as a rust preventive. |
| C. | in hard water for cleaning of cloth. |
| D. | as a foam depressant in distillation column. |
| Answer» B. as a rust preventive. | |
| 3022. |
Which of the following processes does not produce Cl2 as a co-product during the manufacture of caustic soda ? |
| A. | Diaphragm electrolytic cell process |
| B. | Mercury electrolytic cell process |
| C. | Lime-soda process |
| D. | None of these |
| Answer» D. None of these | |
| 3023. |
Bleaching action of bleaching powder is due to its __________ properties. |
| A. | reducing |
| B. | oxidising |
| C. | disinfecting |
| D. | none of these |
| Answer» C. disinfecting | |
| 3024. |
Calgon used in water treatment is chemically |
| A. | sodium phosphate |
| B. | sodium hexametaphosphate |
| C. | calcium phosphate |
| D. | tricresyl phosphate |
| Answer» C. calcium phosphate | |
| 3025. |
Which oil is preferred for paint manufacture ? |
| A. | Drying oil |
| B. | Non-drying oil |
| C. | Semi-drying oil |
| D. | Saturated oil |
| Answer» B. Non-drying oil | |
| 3026. |
Styrene butadiene rubber (SBR) is |
| A. | a natural rubber. |
| B. | a synthetic polymer. |
| C. | a synthetic monomer. |
| D. | another name of silicone rubber. |
| Answer» C. a synthetic monomer. | |
| 3027. |
Ethylene oxide is produced by oxidation of ethylene in presence of AgO catalyst at |
| A. | 1 atm & 100 C |
| B. | 5 atm & 275 C |
| C. | 100 atm & 500 C |
| D. | 50 atm & 1000 C |
| Answer» C. 100 atm & 500 C | |
| 3028. |
In a single effect evaporator, the economy is |
| A. | 1 |
| B. | < 1 |
| C. | > 1 |
| D. | none of these |
| Answer» C. > 1 | |
| 3029. |
LMTD correction factor which is to be applied for a cross-flow heat exchanger increases with increase in the number of shell passes. Its value for a single pass cross flow heat exchanger is |
| A. | 0 |
| B. | 1 |
| C. | >1 |
| D. | <1 |
| Answer» E. | |
| 3030. |
Which of the following is not concerned with the heat transfer? |
| A. | Brinkman number |
| B. | Stanton number |
| C. | Schmidt number |
| D. | Peclet number |
| Answer» D. Peclet number | |
| 3031. |
Latent heat absorbed by 1 lb of water at 212 F, when it is changed to steam at 212 F, may be around __________ BTU. |
| A. | 180 |
| B. | 970 |
| C. | 3.97 |
| D. | none of these |
| Answer» B. 970 | |
| 3032. |
In counter flow compared to parallel flow, |
| A. | LMTD is greater. |
| B. | less surface area is required for a given heat transfer rate. |
| C. | both (a) and (b). |
| D. | more surface area is required for a given heat transfer rate. |
| Answer» D. more surface area is required for a given heat transfer rate. | |
| 3033. |
A 2-4 heat exchanger involves |
| A. | only counter-flow of fluids. |
| B. | only parallel-flow of fluids. |
| C. | both counter and parallel-flow of the fluids. |
| D. | smaller pressure drop compared to 1-2 exchanger. |
| Answer» D. smaller pressure drop compared to 1-2 exchanger. | |
| 3034. |
In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always |
| A. | < 1 |
| B. | > 1 |
| C. | 1 |
| D. | |
| Answer» B. > 1 | |
| 3035. |
Nusselt number (for forced convection heat transfer) is a function of the __________ number. |
| A. | Prandtl |
| B. | Reynolds |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 3036. |
Which type of heat exchanger is preferred for heavy heat loads ? |
| A. | Double pipe |
| B. | Plate fine |
| C. | Series and parallel set of shell and tube |
| D. | None of these |
| Answer» D. None of these | |
| 3037. |
While the total emissivity of a perfect black body is unity, the same for a real body is |
| A. | 0 |
| B. | 1 |
| C. | > 1 |
| D. | between 0 and 1 |
| Answer» E. | |
| 3038. |
Film boiling occurs at __________ pressure. |
| A. | atmospheric |
| B. | sub-atmospheric |
| C. | negative |
| D. | very high |
| Answer» E. | |
| 3039. |
Heat flux through several resistances in series in analogous to the current flowing through several |
| A. | resistances in parallel. |
| B. | capacitors in series. |
| C. | resistances in series. |
| D. | none of these. |
| Answer» D. none of these. | |
| 3040. |
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the |
| A. | surrounding temperature. |
| B. | average temperature of the fin. |
| C. | temperature of the fin end. |
| D. | constant temperature equal to that of the base |
| Answer» E. | |
| 3041. |
Vacuum is generally maintained in the vapour space of an evaporator mainly to |
| A. | get economical temperature difference by using moderate pressure steam. |
| B. | facilitate forward feeding in multiple effect evaporation. |
| C. | concentrate heat sensitive materials. |
| D. | achieve very high concentration of the final product. |
| Answer» B. facilitate forward feeding in multiple effect evaporation. | |
| 3042. |
Which of the following is unimportant in forced convection ? |
| A. | Reynolds number |
| B. | Prandtl number |
| C. | Grashhoff number |
| D. | none of these |
| Answer» D. none of these | |
| 3043. |
Steam is to be condensed in a shell and tube heat exchanger, 5 m long with a shell diameter of 1 m. Cooling water is to be used for removing the heat. Heat transfer co-efficient for the cooling water, whether on shell side or tube side is the same. The best arrangement is |
| A. | vertical heat exchanger with steam on tube side. |
| B. | vertical heat exchanger with steam on shell side. |
| C. | horizontal heat exchanger with steam on tube side. |
| D. | horizontal heat exchanger with steam on shell side. |
| Answer» C. horizontal heat exchanger with steam on tube side. | |
| 3044. |
In a multiple effect evaporator, the effect of boiling point elevation is to |
| A. | reduce the capacity |
| B. | reduce the economy |
| C. | increase the economy |
| D. | none of these |
| Answer» B. reduce the economy | |
| 3045. |
The rate of heat transfer through a pipe wall is given by, . For cylinder of very thin wall, q can be approximated by |
| A. | <img src="/_files/images/chemical-engineering/heat-transfer/271-499-2.png"> |
| B. | <img src="/_files/images/chemical-engineering/heat-transfer/271-499-3.png"> |
| C. | <img src="/_files/images/chemical-engineering/heat-transfer/271-499-4.png"> |
| D. | <img src="/_files/images/chemical-engineering/heat-transfer/271-499-5.png"> |
| Answer» E. | |
| 3046. |
Dropwise condensation occurs on __________ surfaces. |
| A. | clean and dirt free |
| B. | smooth clean |
| C. | contaminated cooling |
| D. | polished |
| Answer» D. polished | |
| 3047. |
If Prandtl number is greater than the Schmidt number, then the |
| A. | thermal boundary layer lies inside the concentration boundary layer. |
| B. | concentration boundary layer lies inside the thermal boundary layer. |
| C. | thermal & concentration boundary layers are of equal thickness. |
| D. | hydrodynamic(i.e., momentum)boundary layer is thicker than the other two. |
| Answer» B. concentration boundary layer lies inside the thermal boundary layer. | |
| 3048. |
Which of the following accessories is provided in the vapor line of an evaporator for removing the entrained liquid ? |
| A. | Bleed point |
| B. | Vent |
| C. | Catchall |
| D. | Baffle |
| Answer» D. Baffle | |
| 3049. |
Rate of heat transfer by vaporisation from pools of water is affected by the |
| A. | nature of heating surface and distribution of bubbles. |
| B. | surface tension of water. |
| C. | viscosity of water. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 3050. |
Multiple effect evaporators are commonly used in the manufacture of P. Paper Q. Superphosphate R. Sugar S. Fats |
| A. | P and Q |
| B. | P and R |
| C. | P and S |
| D. | R and S |
| Answer» D. R and S | |