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.
| 3051. |
Which of the following has the highest thermal conductivity ? |
| A. | Brick |
| B. | Air |
| C. | Water |
| D. | Silver |
| Answer» E. | |
| 3052. |
Film boiling is usually not desired in commercial equipments, because |
| A. | the heat transfer rate is low in view of the large temperature drop. |
| B. | it is difficult to maintain. |
| C. | it is not economic. |
| D. | none of these. |
| Answer» B. it is difficult to maintain. | |
| 3053. |
For the same heat transfer area and the terminal conditions, the ratio of the capacities of a single effect evaporator to a triple effect evaporator is |
| A. | 3 |
| B. | 0.33 |
| C. | 1 |
| D. | 1.33 |
| Answer» D. 1.33 | |
| 3054. |
In a multipass shell and tube heat exchanger, tube side return pressure loss is equal to __________ the velocity head. |
| A. | twice |
| B. | four times |
| C. | square root of |
| D. | square of |
| Answer» C. square root of | |
| 3055. |
For a given ambient air temperature with increase in the thickness of insulation of a hot cylinderical pipe, the rate of heat loss from the surface would |
| A. | decrease |
| B. | increase |
| C. | first decrease and then increase |
| D. | first increase and then decrease |
| Answer» E. | |
| 3056. |
In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is |
| A. | minimum |
| B. | maximum |
| C. | zero |
| D. | infinity |
| Answer» D. infinity | |
| 3057. |
For what value of Prandtl number, the Col-burn analogy is valid ? |
| A. | 0.06 to 120 |
| B. | 0.6 to 120 |
| C. | 1 to 103 |
| D. | l to 50 |
| Answer» C. 1 to 103 | |
| 3058. |
In a forward feed multiple effect, the pressure build up will be |
| A. | least at the inlet of the first effect. |
| B. | least at the outlet of the last effect. |
| C. | highest at the inlet of the last effect. |
| D. | highest at the outlet of the last effect. |
| Answer» C. highest at the inlet of the last effect. | |
| 3059. |
Convective heat transfer, in which heat is transferred by movement of warmed matter is described by |
| A. | Fourier's law |
| B. | Newton's law of cooling |
| C. | Fick's law |
| D. | none of these |
| Answer» C. Fick's law | |
| 3060. |
The process used for the manufacture of ethyl alcohol from molasses is |
| A. | distillation |
| B. | dehydration |
| C. | dehydrogenation |
| D. | none of these |
| Answer» E. | |
| 3061. |
Most easily and cheaply available fibrous raw material for paper manufacture available in India is bamboo. The yield of pulp produced from fibrous raw material by mechanical process is about __________ percent. |
| A. | 75 |
| B. | < 10 |
| C. | > 30 |
| D. | 50 |
| Answer» C. > 30 | |
| 3062. |
Absorption of SO3 in 97% H2SO4 is |
| A. | exothermic |
| B. | endothermic |
| C. | not possible |
| D. | none of these |
| Answer» B. endothermic | |
| 3063. |
__________ process is used for the commercial production of nitric acid by the catalytic oxidation of ammonia. |
| A. | Solvay |
| B. | Ostwald's |
| C. | Haber's |
| D. | none of these |
| Answer» C. Haber's | |
| 3064. |
Sulphuric acid solution having a specific gravity of 1.20 at room temperature is used mainly for the |
| A. | fertiliser manufacture |
| B. | car battery solution |
| C. | synthesis of oleum |
| D. | water treatment |
| Answer» C. synthesis of oleum | |
| 3065. |
Vulcanisation of rubber |
| A. | decreases its tensile strength. |
| B. | increases its ozone & oxygen reactivity. |
| C. | increases its oil & solvent resistance. |
| D. | converts its plasticity into elasticity. |
| Answer» E. | |
| 3066. |
Raw materials for 'Solvay Process' for manufacture of the soda ash are |
| A. | salt, limestone and coke or gas. |
| B. | ammonia, salt and limestone. |
| C. | ammonia limestone and coke. |
| D. | none of these. |
| Answer» B. ammonia, salt and limestone. | |
| 3067. |
Chloral is used in the manufacture of |
| A. | DDT |
| B. | BHC |
| C. | parathion |
| D. | none of these |
| Answer» B. BHC | |
| 3068. |
Bromine is used in the preparation of |
| A. | fire extinguishing compounds. |
| B. | fire proofing agents. |
| C. | dyes and antiknock compounds. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 3069. |
Sudden temperature fluctuation does not affect pyrex glass, because of its |
| A. | low co-efficient of expansion. |
| B. | high co-efficient of expansion. |
| C. | high melting point. |
| D. | both (b) and (c). |
| Answer» B. high co-efficient of expansion. | |
| 3070. |
The only commercial Fischer-Tropsch plant for producing liquid hydrocarbon fuel from coal is located at |
| A. | SASOL (in South Africa). |
| B. | Redcar (U.K.). |
| C. | Los-Angles (U.S.A.). |
| D. | Trombay (India). |
| Answer» B. Redcar (U.K.). | |
| 3071. |
Lurgi coal gasifier is a pressurised __________ bed reactor. |
| A. | moving |
| B. | fixed |
| C. | fluidised |
| D. | entrained |
| Answer» B. fixed | |
| 3072. |
Oils are partially hydrogenated (not fully) to manufacture vanaspati, because fully saturated solidified oils |
| A. | cause cholesterol build up and blood clotting. |
| B. | are prone to rancid oxidation. |
| C. | always contain some amount of nickel (as their complete removal is very difficult). |
| D. | have affinity to retain harmful sulphur compounds. |
| Answer» B. are prone to rancid oxidation. | |
| 3073. |
Paper grade bamboo contains about __________ percent cellulose. |
| A. | 5 |
| B. | 20 |
| C. | 40 |
| D. | 60 |
| Answer» B. 20 | |
| 3074. |
Carboxymethyl cellulose (CMC) is added in detergents to act as a/an |
| A. | surfactant |
| B. | builder |
| C. | optical brightening agent |
| D. | anti soil redeposition agent |
| Answer» E. | |
| 3075. |
Heating of __________ to 120 C, produces plaster of paris. |
| A. | blue vitriol |
| B. | gypsum |
| C. | calcium silicate |
| D. | calcium sulphate |
| Answer» C. calcium silicate | |
| 3076. |
Which of the following has sodium bicarbonate as its main constituent ? |
| A. | Baking soda |
| B. | Baking powder |
| C. | Washing soda |
| D. | none of these |
| Answer» C. Washing soda | |
| 3077. |
Ordinary glass is not a/an |
| A. | amorphous isotropic material. |
| B. | supercooled liquid. |
| C. | material with sharp definite melting point. |
| D. | electrical insulator. |
| Answer» D. electrical insulator. | |
| 3078. |
In premitive days, __________ was being manufactured by Leblanc Process. |
| A. | alum |
| B. | washing soda |
| C. | soda ash |
| D. | calcium carbide |
| Answer» D. calcium carbide | |
| 3079. |
Free alkali in a toilet soap is __________ that in a laundary shop. |
| A. | less than |
| B. | more than |
| C. | same |
| D. | none of these |
| Answer» B. more than | |
| 3080. |
Dehydrogenation of isopropanol produces |
| A. | propyl alcohol |
| B. | acetone |
| C. | trichloroethylene |
| D. | formaldehyde |
| Answer» C. trichloroethylene | |
| 3081. |
Concentration of hydrogen peroxide is done by |
| A. | crystallisation |
| B. | vacuum crystallisation |
| C. | atmospheric distillation |
| D. | dehydration |
| Answer» C. atmospheric distillation | |
| 3082. |
Helium is produced on commercial scale from |
| A. | air |
| B. | natural gas |
| C. | coke oven gas |
| D. | none of these |
| Answer» C. coke oven gas | |
| 3083. |
Cumene is the starting material for the production of |
| A. | benzoic acid |
| B. | phenol and acetone |
| C. | isoprene |
| D. | styrene |
| Answer» C. isoprene | |
| 3084. |
The type of high refractive index glass used in optical instruments is __________ glass. |
| A. | pyrex |
| B. | flint |
| C. | crookes |
| D. | none of these |
| Answer» C. crookes | |
| 3085. |
Oxidation of ortho-xylene in presence of __________ catalyst is done to produce phthalic anhydride on commercial scale. |
| A. | nickel |
| B. | vanadium |
| C. | alumina |
| D. | iron |
| Answer» C. alumina | |
| 3086. |
Most commonly used rubber vulcanising agent is |
| A. | sulphur |
| B. | bromine |
| C. | platinum |
| D. | alumina |
| Answer» B. bromine | |
| 3087. |
Terylene is |
| A. | same as dacron |
| B. | a polyester |
| C. | both (a) & (b) |
| D. | neither (a) nor(b) |
| Answer» D. neither (a) nor(b) | |
| 3088. |
Fermentation of molasses to produce ethyl alcohol is done at __________ C |
| A. | 20 - 30 |
| B. | < - 5 |
| C. | 100 - 150 |
| D. | 250 - 300 |
| Answer» B. < - 5 | |
| 3089. |
The catalyst used in the manufacture of DDT is |
| A. | alumina. |
| B. | silica. |
| C. | 20% oleum. |
| D. | aluminium chloride. |
| Answer» D. aluminium chloride. | |
| 3090. |
Most widely and commonly used coagulant for the removal of suspended impurities in water is |
| A. | bleaching powder |
| B. | slaked lime |
| C. | alum |
| D. | copper sulphate |
| Answer» D. copper sulphate | |
| 3091. |
Which of the following is not produced on commercial scale from sea water? |
| A. | Bromine. |
| B. | Magnesium compounds. |
| C. | Potassium compounds. |
| D. | Sodium sulphate. |
| Answer» E. | |
| 3092. |
As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient |
| A. | continues to increase. |
| B. | continues to decrease. |
| C. | goes through a minimum. |
| D. | goes through a maximum. |
| Answer» D. goes through a maximum. | |
| 3093. |
Heat transfer rate per unit area is called |
| A. | thermal conductivity |
| B. | heat flux |
| C. | heat transfer co-efficient |
| D. | thermal diffusivity |
| Answer» C. heat transfer co-efficient | |
| 3094. |
Log mean temperature difference (LMTD) cannot be used, if |
| A. | heat transfer co-efficient over the entire heat exchanger is not constant. |
| B. | there exists an unsteady state. |
| C. | the heat capacity is not constant and there is a phase change. |
| D. | none of these. |
| Answer» E. | |
| 3095. |
What is Nusselt number ? |
| A. | <img src="/_files/images/chemical-engineering/heat-transfer/233-15-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/heat-transfer/233-15-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/heat-transfer/233-15-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/heat-transfer/233-15-4.png"> |
| Answer» C. <img src="/_files/images/chemical-engineering/heat-transfer/233-15-3.png"> | |
| 3096. |
Steam traps are provided in steam carrying pipelines to |
| A. | condense steam. |
| B. | release excess steam pressure by bleeding steam. |
| C. | remove condensate and inert gases. |
| D. | none of these. |
| Answer» D. none of these. | |
| 3097. |
The Dietus-Boelter equation for convective leat transfercannot be used for |
| A. | low Reynold's number |
| B. | very low Grashoff number |
| C. | molten metals |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 3098. |
A hot liquid is kept in a big room. The logorithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly a/an |
| A. | ellipse |
| B. | straight line |
| C. | parabola |
| D. | circular arc |
| Answer» C. parabola | |
| 3099. |
Radiation heat transfer rates does not depend upon the |
| A. | type of absorbing surface. |
| B. | distance between the heat source and the object receiving the heat. |
| C. | surface area and temperature of the heat source. |
| D. | none of these. |
| Answer» E. | |
| 3100. |
Film condensation is promoted on a/an __________ surface. |
| A. | oily |
| B. | coated |
| C. | clean & smooth |
| D. | dirty |
| Answer» D. dirty | |