MCQOPTIONS
Saved Bookmarks
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.
| 1151. |
Large scale fire on fuel gas line is normally extinguished by |
| A. | water |
| B. | steam |
| C. | foam |
| D. | nitrogen |
| Answer» E. | |
| 1152. |
Electrometallurgy is not involved in the extraction of __________ from its ore. |
| A. | aluminium |
| B. | tin |
| C. | lead |
| D. | both(b) & (c) |
| Answer» E. | |
| 1153. |
Sub zero treatment of steel is done to |
| A. | suppress martensite transformation. |
| B. | enhance its working performance in sub zero atmosphere. |
| C. | reduce the retained austenite in hardened steel. |
| D. | induce temper brittleness after its hardening. |
| Answer» D. induce temper brittleness after its hardening. | |
| 1154. |
Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as |
| A. | Re0.5, Re0.8 |
| B. | Re0.8, Re-0.5 |
| C. | Re0.8, Re0.5 |
| D. | Re-0.8, Re0.5 |
| Answer» D. Re-0.8, Re0.5 | |
| 1155. |
Which of the following is the most suitable material of construction for the condenser tubes, where the cooling medium is brine (salty water)? |
| A. | Aluminium |
| B. | Copper |
| C. | Titanium |
| D. | Stainless steel |
| Answer» D. Stainless steel | |
| 1156. |
A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm2. |
| A. | 6 |
| B. | 18 |
| C. | 38 |
| D. | 52 |
| Answer» C. 38 | |
| 1157. |
Permanent set in a material is produced by subjecting it to |
| A. | triaxial loading. |
| B. | fatigue loading. |
| C. | stresses beyond the elastic limit. |
| D. | tensile & compressive loads simultaneously. |
| Answer» D. tensile & compressive loads simultaneously. | |
| 1158. |
Water-tube boiler is the one, in which |
| A. | water passes through tubes and flue gases around it. |
| B. | tube carrying hot flue gases are immersed in a pool of water. |
| C. | tubes are placed in vertical position. |
| D. | none of these. |
| Answer» B. tube carrying hot flue gases are immersed in a pool of water. | |
| 1159. |
Mho's scale of hardness, which consists of 10 standard minerals is used for the measurement of __________ hardness. |
| A. | scratch |
| B. | indentation |
| C. | dynamic |
| D. | rebound |
| Answer» B. indentation | |
| 1160. |
The expected efficiency of a single rivetted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased __________ times. |
| A. | two |
| B. | four |
| C. | six |
| D. | eight |
| Answer» B. four | |
| 1161. |
The tensile load-elongation curve of a metal does not describe |
| A. | work hardening |
| B. | yield stress |
| C. | anisotropy index |
| D. | necking strain |
| Answer» D. necking strain | |
| 1162. |
Filler material used in welding having the lowest melting point out of the following is |
| A. | aluminium |
| B. | soft solder |
| C. | silver solder |
| D. | brazing spelter |
| Answer» C. silver solder | |
| 1163. |
Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil, N2 = 80%. This flue gas composition indicates that |
| A. | pure oxygen has been used for combustion. |
| B. | nitrogen percentage in the fuel is very high. |
| C. | excess air has been used for combustion. |
| D. | hydrogen is not present in the fuel. |
| Answer» D. hydrogen is not present in the fuel. | |
| 1164. |
Silicon in steel |
| A. | makes it usable in almost all magnetic circuits where alternating current is used. |
| B. | increases its electrical resistivity and decreases the hysteresis loss. |
| C. | is present upto 5% & 4% respectively when used in transformers & motor armatures. |
| D. | all 'a', 'b' & 'c'. |
| Answer» E. | |
| 1165. |
A coal with high __________ content will ignite most easily. |
| A. | hydrogen |
| B. | oxygen |
| C. | volatile matter |
| D. | fixed carbon |
| Answer» D. fixed carbon | |
| 1166. |
Yield strength of a polycrystalline metal with an average grain size, d, is proportional to |
| A. | d1/2 |
| B. | d-1/2 |
| C. | d |
| D. | d-1 |
| Answer» C. d | |
| 1167. |
Which of the following metals reacts violently with water ? |
| A. | Mercury |
| B. | Sodium |
| C. | Calcium |
| D. | Magnesium |
| Answer» C. Calcium | |
| 1168. |
Isotropic materials have the same __________ in all the directions. |
| A. | thermal properties |
| B. | elastic properties |
| C. | stresses |
| D. | all (a), (b) & (c) |
| Answer» C. stresses | |
| 1169. |
X-rays do not exhibit the property of |
| A. | reflection |
| B. | scattering |
| C. | diffraction |
| D. | dispersion |
| Answer» C. diffraction | |
| 1170. |
Which of the following is the terminology used for the temperature at which the phase changes occur in a metal ? |
| A. | Critical temperature. |
| B. | Recrystallisation temperature. |
| C. | Phase transformation temperature. |
| D. | Transition temperature. |
| Answer» B. Recrystallisation temperature. | |
| 1171. |
Catalyst used in the catalytic converter employed in automobiles to convert CO into CO and for complete oxidation of un-burnt hydrocarbons is |
| A. | nickel |
| B. | cobalt |
| C. | vanadium |
| D. | platinum |
| Answer» E. | |
| 1172. |
Blast furnace is a |
| A. | counter current reactor |
| B. | co-current reactor |
| C. | cross-current reactor |
| D. | combination of all the three |
| Answer» B. co-current reactor | |
| 1173. |
The stress at which extension of the material takes place more rapidly as compared to the increase in load is termed as the __________ point of the material. |
| A. | elastic |
| B. | ultimate |
| C. | yielding |
| D. | breaking |
| Answer» D. breaking | |
| 1174. |
Improvement in mechanical properties of metals in its hot working is due to the grains |
| A. | recrystallisation |
| B. | refinement |
| C. | growth |
| D. | recovery |
| Answer» C. growth | |
| 1175. |
Which of the following absorbs maximum heat in a high pressure boiler ? |
| A. | Economiser |
| B. | Steam superheater |
| C. | Air preheater |
| D. | Furnace water wall |
| Answer» E. | |
| 1176. |
Which of the following is not a dielectric material ? |
| A. | Cotton, silk and paper. |
| B. | Asbestos, glass, porcelain and mica. |
| C. | Rubber and polymeric resins. |
| D. | All refractory materials. |
| Answer» D. All refractory materials. | |
| 1177. |
__________ are normally subjected to sub-zero treatment. |
| A. | Highly stressed parts |
| B. | Gauges or precision parts |
| C. | Cold rolled sheets |
| D. | Non machinable materials |
| Answer» C. Cold rolled sheets | |
| 1178. |
Which of the following is an example of stress corrosion ? |
| A. | Season cracking of brass. |
| B. | Caustic embrittlement of steel. |
| C. | Both (a) & (b). |
| D. | Neither (a) nor (b). |
| Answer» D. Neither (a) nor (b). | |
| 1179. |
Which of the following contributes maximum as main source of sulphur in the blast furnace charge ? |
| A. | Sinter |
| B. | Coke |
| C. | Iron ore |
| D. | Limestone |
| Answer» C. Iron ore | |
| 1180. |
Which of the following is normally not found in both the S.I. (petrol) & C.I. (diesel) engines ? |
| A. | Air filter |
| B. | Fuel injector |
| C. | Exhaust silencer |
| D. | Battery |
| Answer» C. Exhaust silencer | |
| 1181. |
The pH value is the measure of hydrogen ion concentration in a solution. The term pH stands for the __________ in the solution. |
| A. | power of hydrogen ion concentration |
| B. | percentage of hydrogen ions |
| C. | presence of hydrogen ions |
| D. | none of these |
| Answer» B. percentage of hydrogen ions | |
| 1182. |
Diamond does not conduct electricity, because |
| A. | its structure is very compact. |
| B. | no free electrons are present. |
| C. | it is of crystalline nature. |
| D. | there are only carbon atoms present. |
| Answer» C. it is of crystalline nature. | |
| 1183. |
Shrinkage allowance on pattern is provided to compensate for shrinkage when the |
| A. | metal changes from liquid state to solid state at freezing temperature. |
| B. | solid phase temperature drops from freezing temperature to the room temperature. |
| C. | liquid metal temperature drops from pouring temperature to room temperature. |
| D. | liquid metal temperature drops from pouring temperature to freezing temperature. |
| Answer» C. liquid metal temperature drops from pouring temperature to room temperature. | |
| 1184. |
A __________ type pressure sensing element is commonly used in aneroid barometer. |
| A. | capsule |
| B. | bellow |
| C. | spiral tube |
| D. | flat diaphragm |
| Answer» B. bellow | |
| 1185. |
Which of the following low melting alloy containing bismuth and lead is used for electric fuse ? |
| A. | Wood's metal |
| B. | Babbit metal |
| C. | Monel metal |
| D. | Duralumin |
| Answer» B. Babbit metal | |
| 1186. |
The quantity of electricity required to deposit one gm equivalent of any substance is one |
| A. | ampere |
| B. | coulomb |
| C. | microfaraday |
| D. | faraday |
| Answer» E. | |
| 1187. |
Steel balls are manufactured by |
| A. | sintering |
| B. | casting |
| C. | cold heading |
| D. | spinning |
| Answer» D. spinning | |
| 1188. |
Impeller & casing of centrifugal pump handling corrosive liquid and frequently running under cavitation condition is most prone to __________ corrosion. |
| A. | uniform |
| B. | oxygen diffusion |
| C. | pitting |
| D. | inter-granular |
| Answer» D. inter-granular | |
| 1189. |
In "Imperial Smelting Process" for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following : |
| A. | Jet of water at high pressure. |
| B. | Blast of air. |
| C. | Mixture of water and air. |
| D. | Rain of molten lead. |
| Answer» E. | |
| 1190. |
Carburettor in a spark ignition engine is used to |
| A. | mix air-fuel in the desired ratio. |
| B. | maintain a constant speed at varying loads. |
| C. | adjust the stroke length. |
| D. | increase the compression ratio. |
| Answer» B. maintain a constant speed at varying loads. | |
| 1191. |
A steam carraying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted will |
| A. | increase. |
| B. | decrease. |
| C. | remain unaffected. |
| D. | may increase or decrease; depends on the thickness of each layer. |
| Answer» D. may increase or decrease; depends on the thickness of each layer. | |
| 1192. |
Angular displacement can be measured suitably by a |
| A. | shaft encoder. |
| B. | linear variable differential transducer (LVDT). |
| C. | stroboscope. |
| D. | tachometer. |
| Answer» B. linear variable differential transducer (LVDT). | |
| 1193. |
Electrochemical corrosion can occur, only if __________ is present in contact with metal. |
| A. | air |
| B. | oxygen |
| C. | liquid medium |
| D. | gaseous medium |
| Answer» D. gaseous medium | |
| 1194. |
Role of a "collector" in froth floatation is to |
| A. | form a water repelling film on the mineral surface. |
| B. | create and stabilise the froth. |
| C. | act as a surface. |
| D. | collect the minerals according to their specific gravity. |
| Answer» B. create and stabilise the froth. | |
| 1195. |
For the running of power generating turbines, the steam used should be |
| A. | wet |
| B. | superheated |
| C. | at ordinary pressure |
| D. | none of these |
| Answer» C. at ordinary pressure | |
| 1196. |
Electric arc furnace is employed mainly for the production of __________ steel. |
| A. | high carbon |
| B. | alloy |
| C. | mild |
| D. | plain carbon |
| Answer» C. mild | |
| 1197. |
__________ test is the appropriate test to determine whether a material is ductile or brittle. |
| A. | Impact |
| B. | Cupping |
| C. | Hardness |
| D. | Tensile |
| Answer» B. Cupping | |
| 1198. |
Capacity & power requirement for an air compressor working at high altitude compared to sea-level will be |
| A. | more |
| B. | less |
| C. | same |
| D. | either more or less; depends on the climatic conditions. |
| Answer» C. same | |
| 1199. |
Out of the following, __________ waves have the largest wavelength. |
| A. | radio |
| B. | light |
| C. | X-ray |
| D. | Gamma-ray |
| Answer» B. light | |
| 1200. |
Cold cracking in the heat affected zone of a high strength steel weld can take place because of the |
| A. | retained austenite. |
| B. | martensite formation. |
| C. | relatively high sulphur content in the base metal. |
| D. | sufficient hydrogen present in the welding arc. |
| Answer» C. relatively high sulphur content in the base metal. | |