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.
| 3901. |
Maximum heat transfer rate is obtained in __________ flow. |
| A. | laminar |
| B. | turbulent |
| C. | creeping |
| D. | transition region |
| Answer» C. creeping | |
| 3902. |
In case of __________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface. |
| A. | nucleate |
| B. | local |
| C. | pool |
| D. | saturated |
| Answer» C. pool | |
| 3903. |
LMTD can't be used as such without a correction factor for the |
| A. | multipass heat exchanger. |
| B. | baffled heat exchanger. |
| C. | condensation of mixed vapour in a condenser. |
| D. | all (a) (b) and (c). |
| Answer» E. | |
| 3904. |
Fqra cold viscous feed, backward feed gives __________ than forward feed. |
| A. | a higher capacity |
| B. | a lower capacity |
| C. | lower economy |
| D. | none of these |
| Answer» B. a lower capacity | |
| 3905. |
Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100 C and the inside heat transfer co-efficient is 3k/l. If the wall temperature on the outside is held at 25 C, what is the inside wall temperature in degree centigrade ? |
| A. | 35.5 |
| B. | 43.75 |
| C. | 81.25 |
| D. | 48.25 |
| Answer» D. 48.25 | |
| 3906. |
An ejector is used to |
| A. | increase pressure |
| B. | increase temperature |
| C. | remove condensate |
| D. | none of these |
| Answer» E. | |
| 3907. |
Extremely large or small volumes of fluids are generally best routed through the shell side of a shell and tube heat exchanger, because of the |
| A. | less corrosion problems. |
| B. | flexibility possible in the baffle arrangement. |
| C. | low pressure drop. |
| D. | high heat transfer co-efficient. |
| Answer» C. low pressure drop. | |
| 3908. |
All analogy equations connecting friction factor and heat transfer co-efficient apply only to |
| A. | wall or skin friction |
| B. | form friction |
| C. | both (a) and (b) |
| D. | turbulent flow |
| Answer» B. form friction | |
| 3909. |
Electro-magnetic spectrum range, which is important for radiation varies from __________ microns. |
| A. | 1 to 100 |
| B. | 0.5 to 50 |
| C. | 10 to 100 |
| D. | 100 to 1000 |
| Answer» C. 10 to 100 | |
| 3910. |
Overall thermal resistance for conductive heat transfer through a series of flat resistances is equal to the |
| A. | maximum resistance in the series. |
| B. | sum of all resistances. |
| C. | average of all resistances. |
| D. | minimum resistance presents in the series. |
| Answer» C. average of all resistances. | |
| 3911. |
Double pipe heat exchangers are preferably useful, when |
| A. | high viscosity liquid is to be cooled. |
| B. | requirement of heat transfer area is low. |
| C. | overall heat transfer co-efficient is very high. |
| D. | a corrosive liquid is to be heated. |
| Answer» C. overall heat transfer co-efficient is very high. | |
| 3912. |
Removal of __________ heat is involved in the condensation of a vapor under saturated conditions. |
| A. | super |
| B. | sensible |
| C. | latent |
| D. | both(b) & (c) |
| Answer» D. both(b) & (c) | |
| 3913. |
Kg of liquid evaporated per hour in an evaporator is defined as its |
| A. | capacity |
| B. | economy |
| C. | steam load |
| D. | none of these |
| Answer» B. economy | |
| 3914. |
Open pan evaporators are preferred to be used, when the solution to be concentrated is |
| A. | scaling |
| B. | highly viscous |
| C. | corrosive |
| D. | salty |
| Answer» C. corrosive | |
| 3915. |
is termed as the __________ number. |
| A. | Grashoff |
| B. | Nusselt |
| C. | Prandtl |
| D. | Stanton |
| Answer» D. Stanton | |
| 3916. |
The maximum heat transfer co-efficient from steam heating will be attained when the steam is |
| A. | supersaturated |
| B. | saturated |
| C. | wet |
| D. | none of these |
| Answer» C. wet | |
| 3917. |
The product obtained on mixing calcium oxide with water is called |
| A. | quicklime |
| B. | slaked lime |
| C. | milk of lime |
| D. | none of these |
| Answer» C. milk of lime | |
| 3918. |
The major constituent of black liquor generated during paper manufacture is sodium |
| A. | sulphate |
| B. | carbonate |
| C. | hydroxide |
| D. | bi-carbonate |
| Answer» C. hydroxide | |
| 3919. |
Process conditions in fermentator used for production of penicillin is |
| A. | 25 C, 2 atm. |
| B. | 50 C, l0 atm. |
| C. | 30 C, 200 mm Hg (absolute). |
| D. | 90 C, 45 atm. |
| Answer» B. 50 C, l0 atm. | |
| 3920. |
Platinum is a versatile catalyst for many processes in chemical industries. It is highly prone to be poisoned by the presence of |
| A. | carbon |
| B. | arsenic |
| C. | lead |
| D. | sulphur |
| Answer» C. lead | |
| 3921. |
Sodium chloride content in sea water is about __________ gms/litre. |
| A. | 2 |
| B. | 10 |
| C. | 25 |
| D. | 50 |
| Answer» D. 50 | |
| 3922. |
Fluorescent dyes are added in detergents to |
| A. | act as fabric brightener (by converting ultraviolet light to visible light) thereby improving the whiteness appearance of white fabrics. |
| B. | attain distinctiveness from other brands. |
| C. | act as tarnish inhibitor for metals like German silver. |
| D. | none of these |
| Answer» B. attain distinctiveness from other brands. | |
| 3923. |
High magnesia lime is added to hot sugar cane juice (during the manufacture of sugar) to |
| A. | flocculate the impurities. |
| B. | facilitate fast filtration. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 3924. |
In a forward feed multiple effect evaporator unit |
| A. | viscosity of liquid is highest in first effect. |
| B. | transfer from effect to effect is done by pumps. |
| C. | no pump is required to withdraw the product from the last effect. |
| D. | none of these. |
| Answer» E. | |
| 3925. |
In case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is |
| A. | linear |
| B. | hyperbolic |
| C. | parabolic |
| D. | none of these |
| Answer» D. none of these | |
| 3926. |
For heat flow through very thick walled cylinder, use____mean radius. |
| A. | arithmetic |
| B. | logarithmic |
| C. | geometric |
| D. | either (a) or (c) |
| Answer» C. geometric | |
| 3927. |
Indirect contact heat exchangers are preferred over direct contact heat exchangers, because |
| A. | heat transfer co-efficient are high. |
| B. | there is no risk of contamination. |
| C. | there is no mist formation. |
| D. | cost of equipment is lower. |
| Answer» C. there is no mist formation. | |
| 3928. |
Styrene is produced from ethyl benzene by the process of |
| A. | dehydrogenation |
| B. | oxidation |
| C. | alkylation |
| D. | dehydration |
| Answer» B. oxidation | |
| 3929. |
Gelatine which is a nitrogenous organic protein is obtained by the hydrolysis of |
| A. | callagen |
| B. | tannin |
| C. | molasses |
| D. | carbohydrate |
| Answer» B. tannin | |
| 3930. |
Paper pulp produced by kraft/sulphate process is |
| A. | bleached easily |
| B. | dull white in color |
| C. | strong fibrous |
| D. | dark colored |
| Answer» D. dark colored | |
| 3931. |
Claude process of gas liquefaction employs |
| A. | merely compression of gas beyond its critical pressure. |
| B. | Joule-Thomson expansion cooling. |
| C. | heat exchange with colder stream. |
| D. | adiabatic expansion against a piston or in a turbine. |
| Answer» E. | |
| 3932. |
The main use of HCl is in the |
| A. | drilling of petroleum wells and pickling of steel sheets. |
| B. | manufacture of cationic detergent. |
| C. | treatment of spent fuel of nuclear reactor. |
| D. | none of these. |
| Answer» B. manufacture of cationic detergent. | |
| 3933. |
The gasification reaction represented by, C + H2O = CO + H2, is a/an __________ reaction. |
| A. | exothermic |
| B. | endothermic |
| C. | catalytic |
| D. | autocatalytic |
| Answer» C. catalytic | |
| 3934. |
Viscose rayon is chemically |
| A. | cellulose nitrate |
| B. | regenerated cellulose nitrate |
| C. | cellulose acetate |
| D. | regenerated cellulose acetate |
| Answer» E. | |
| 3935. |
Which of the following is not a raw material used for the manufacture of ordinary glass? |
| A. | Iron oxide |
| B. | Soda ash |
| C. | Limestone |
| D. | Silica |
| Answer» B. Soda ash | |
| 3936. |
Esterification reaction |
| A. | produces soap. |
| B. | is reversible. |
| C. | is a reaction between an alcohol and an organic acid. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 3937. |
In sulphate pulp manufacture, the pressure and temperature in the digestor is |
| A. | 10 atm., 800 C |
| B. | 10 atm., 170-180 C |
| C. | 1 atm., 170 - 180 C |
| D. | l atm., 800 C |
| Answer» C. 1 atm., 170 - 180 C | |
| 3938. |
Zeolite removes both temporary as well as permanent hardness of water by precipitating calcium and magnesium present in water as insoluble zeolites. Used zeolite is regenerated by flushing with the solution of |
| A. | calcium sulphate |
| B. | sodium chloride |
| C. | sodium sulphate |
| D. | magnesium chloride. |
| Answer» C. sodium sulphate | |
| 3939. |
Pasteurisation of milk means |
| A. | removal of fatty and albuminous substance from it. |
| B. | killing of organisms present in it by heating it at controlled temperature without changing its natural characteristics. |
| C. | inhibiting the growth of micro-organisms without killing them. |
| D. | none of these. |
| Answer» C. inhibiting the growth of micro-organisms without killing them. | |
| 3940. |
Fusion of bauxite and __________ produces high alumina cement. |
| A. | alum |
| B. | limestone |
| C. | coke |
| D. | quartz |
| Answer» C. coke | |
| 3941. |
Oxidation of SO2 to SO3 is favoured by |
| A. | low temperature and low pressure. |
| B. | low temperature and high pressure. |
| C. | high temperature and low pressure. |
| D. | high temperature and high pressure. |
| Answer» C. high temperature and low pressure. | |
| 3942. |
Gun powder, which is an explosive comprises of charcoal, sulphur and |
| A. | glycerene |
| B. | salt petre |
| C. | nitro glycerene |
| D. | dynamite |
| Answer» C. nitro glycerene | |
| 3943. |
Starting raw material for the manufacture of alum is |
| A. | alumina |
| B. | gypsum |
| C. | bauxite |
| D. | ammonium bicarbonate |
| Answer» D. ammonium bicarbonate | |
| 3944. |
Which of the following sugars is the sweetest? |
| A. | Glucose |
| B. | Fructose |
| C. | Sucrose |
| D. | Lactose |
| Answer» C. Sucrose | |
| 3945. |
Which of the following is not a manufactured fuel ? |
| A. | Furnace oil |
| B. | Bagasse |
| C. | Semi-coke |
| D. | Kerosene |
| Answer» C. Semi-coke | |
| 3946. |
Gross heating value of coal is __________ the net heating value. |
| A. | higher than |
| B. | lower than |
| C. | same as |
| D. | none of these |
| Answer» B. lower than | |
| 3947. |
Which of the following is a rich fuel gas ? |
| A. | Producer gas. |
| B. | Coal gas from underground gasification of coal. |
| C. | Refinery gases. |
| D. | None of these. |
| Answer» D. None of these. | |
| 3948. |
By-products recovery process from coal carbonisation is termed as direct, indirect and semi direct process depending upon the method of recovery of |
| A. | tar |
| B. | benzol |
| C. | ammonia |
| D. | none of these |
| Answer» D. none of these | |
| 3949. |
Naphthalene is removed from coke oven gas by |
| A. | scrubbing with wash oil (a petroleum product). |
| B. | adsorbing on bog iron bed. |
| C. | absorbing in vetro-coke solution. |
| D. | none of these. |
| Answer» B. adsorbing on bog iron bed. | |
| 3950. |
Coke oven gas compared to blast furnace gas is |
| A. | more explosive and inflammable. |
| B. | less poisonous. |
| C. | lighter. |
| D. | all (a), (b) and (c). |
| Answer» E. | |