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.
| 1301. |
When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the |
| A. | partial pressure of water vapour is less than the total pressure. |
| B. | humidity is < 100% & dew point temperature of air has not reached. |
| C. | dew point temperature of air has not reached & air is not saturated fully. |
| D. | air is fully saturated. |
| Answer» E. | |
| 1302. |
Absolute zero, pressure will occur, when the molecular momentum of the system becomes zero. A liquid will cease to exist as liquid at |
| A. | high vacuum |
| B. | zero pressure |
| C. | 0°K |
| D. | earth's centre |
| Answer» C. 0¬∞K | |
| 1303. |
Out of the following, the joint produced by __________ has the lowest strength. |
| A. | soldering |
| B. | welding |
| C. | brazing |
| D. | rivetting |
| Answer» B. welding | |
| 1304. |
Fine grain size in metallic material will |
| A. | increase the yield strength. |
| B. | increase the creep strength. |
| C. | increase the fatigue strength. |
| D. | decrease the impact strength. |
| Answer» D. decrease the impact strength. | |
| 1305. |
A compact estimate about the amount of materials handling between various work stations is obtained from the |
| A. | gantt chart |
| B. | bin chart |
| C. | string diagram |
| D. | travel chart |
| Answer» E. | |
| 1306. |
The ratio of thermal & electrical conductivity is same for all the metals at the same temperature ; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K)$ |
| A. | T |
| B. | 1/T |
| C. | T2 |
| D. | 1/T2 |
| Answer» B. 1/T | |
| 1307. |
Solution loss reaction occurs |
| A. | in the blast furnace shaft. |
| B. | during pretreatment of hot metal. |
| C. | in the L.D. process. |
| D. | during deoxidation in the ladle. |
| Answer» B. during pretreatment of hot metal. | |
| 1308. |
Out of the following, the best material capable of withstanding shock & vibration without the danger of cracking is |
| A. | malleable iron |
| B. | grey cast iron |
| C. | chilled cast iron |
| D. | white cast iron |
| Answer» B. grey cast iron | |
| 1309. |
Addition of silicon to aluminium improves its |
| A. | corrosion resistance |
| B. | machinability |
| C. | castability |
| D. | none of these |
| Answer» D. none of these | |
| 1310. |
The most important requirement for aluminium industry is the availability of cheap |
| A. | ore |
| B. | electrical power |
| C. | labour |
| D. | & abundant water |
| Answer» C. labour | |
| 1311. |
Which of the, following is not associated with the functioning of a petrol engine ? |
| A. | Compression ignition system |
| B. | Spark plug |
| C. | Carburettor |
| D. | Otto cycle |
| Answer» B. Spark plug | |
| 1312. |
Ferromagnetic material owe their properties to __________ inner sub-shells. |
| A. | completely filled |
| B. | partially filled |
| C. | equally filled |
| D. | vacant |
| Answer» C. equally filled | |
| 1313. |
Minimum number of members required to form a Public Limited Joint Stock Com-pany is |
| A. | 7 |
| B. | 10 |
| C. | 12 |
| D. | 17 |
| Answer» B. 10 | |
| 1314. |
Highest cutting speed is achieved by the __________ tool material. |
| A. | high speed steel |
| B. | carbide |
| C. | cast alloy |
| D. | plain carbon steel |
| Answer» C. cast alloy | |
| 1315. |
Natural water contains approximately __________ percent of heavy water. |
| A. | 0.015 |
| B. | 0.71 |
| C. | 1.2 |
| D. | 3.5 |
| Answer» B. 0.71 | |
| 1316. |
The property of material, by which a given amount of energy is absorbed by it, without plastic deformation is called |
| A. | resilience |
| B. | toughness |
| C. | ductility |
| D. | impact strength |
| Answer» B. toughness | |
| 1317. |
As the fluid flow rate increases, the float of the rotameter |
| A. | rises in the tube. |
| B. | rotates at higher speed. |
| C. | rotates at lower speed. |
| D. | drops down in the tube. |
| Answer» B. rotates at higher speed. | |
| 1318. |
Frost formation on the evaporator tubes in the domestic refrigerators |
| A. | can be prevented by proper design. |
| B. | decreased compressor power. |
| C. | causes heat loss due to poor heat transfer. |
| D. | is immaterial. |
| Answer» D. is immaterial. | |
| 1319. |
Draft allowance given to patterns is for |
| A. | compensating the liquid state shrinkage. |
| B. | easy removal of pattern from the mold cavity. |
| C. | providing support for the core placement. |
| D. | compensating the solidification shrinkage. |
| Answer» C. providing support for the core placement. | |
| 1320. |
Cast iron contains __________ percent carbon. |
| A. | 2.5 |
| B. | 3.75 |
| C. | 4.75 |
| D. | 5.25 |
| Answer» B. 3.75 | |
| 1321. |
Which of the following is not a natural abrasive ? |
| A. | Silicon carbide |
| B. | Quartz |
| C. | Corundum |
| D. | Emery |
| Answer» B. Quartz | |
| 1322. |
Ammonia gas can be dried by |
| A. | PCl5 |
| B. | quick lime |
| C. | CaCl2 |
| D. | concentrated H2SO4 |
| Answer» C. CaCl2 | |
| 1323. |
For the same heat input & compression ratio, efficiency of Otto cycle is higher than that of diesel cycle, because in Otto cycle. |
| A. | heat rejection is lower. |
| B. | expansion & compression are isentropic. |
| C. | maximum temperature is higher. |
| D. | combustion is at constant volume. |
| Answer» B. expansion & compression are isentropic. | |
| 1324. |
Lead is poured into the joint between two __________ pipes. |
| A. | mild steel |
| B. | concrete |
| C. | cast iron |
| D. | asbestos cement |
| Answer» D. asbestos cement | |
| 1325. |
Methyl orange indicator turns |
| A. | orange yellow in alkaline medium. |
| B. | orange yellow in acidic medium. |
| C. | colourless in acidic medium. |
| D. | colourless in basic medium. |
| Answer» B. orange yellow in acidic medium. | |
| 1326. |
Which of the following accounts for maximum loss of energy in a coal fired boiler ? |
| A. | Incomplete combustion of fuel. |
| B. | Outgoing flue gases. |
| C. | Radiation heat losses. |
| D. | Unburnt carbon in ash. |
| Answer» C. Radiation heat losses. | |
| 1327. |
Paint spray gun works on the principle of |
| A. | Bernoulli's theorem. |
| B. | Boyle's law. |
| C. | Newton's law of viscosity. |
| D. | none of these. |
| Answer» B. Boyle's law. | |
| 1328. |
Vernier calipers can not be used to measure the |
| A. | I.D. & O.D. of the shaft. |
| B. | thickness of parts. |
| C. | depth of holes. |
| D. | clearance between two mating surfaces. |
| Answer» E. | |
| 1329. |
Thermal conductivity of a material does not depend upon its |
| A. | mass |
| B. | volume |
| C. | surface area |
| D. | all 'a', 'b' & 'c' |
| Answer» E. | |
| 1330. |
The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : Cp of copper is 23 J K-1mole-1) |
| A. | 2300 J |
| B. | 4600 J |
| C. | 230 J |
| D. | 2.3 x 106 J |
| Answer» B. 4600 J | |
| 1331. |
Which of the following pairs regarding the effect of alloying elements in steels are not matched correctly ? |
| A. | Cobalt: It contributes to rerl hardness by hardening ferrite. |
| B. | Molybdenum: It forms abrasion resisting particles. |
| C. | Phosphorous: It improves machinability in free cutting steels. |
| D. | Silicon: It reduces oxidation resistance. |
| Answer» B. Molybdenum: It forms abrasion resisting particles. | |
| 1332. |
Piezoelectric is a material |
| A. | whose properties is midway between the constituent materials. |
| B. | which gets polarised, when stressed. |
| C. | in which magnetising force reduces when current flowing through it is in-cresed. |
| D. | which changes dimensions due to applied field. |
| Answer» C. in which magnetising force reduces when current flowing through it is in-cresed. | |
| 1333. |
Which of the following transducers is most commonly used for the measurement of shock and vibration ? |
| A. | Linear variable differential transducer (LVDT) |
| B. | Dial gauge |
| C. | Accelerometer |
| D. | none of these |
| Answer» D. none of these | |
| 1334. |
The best lubricants for a machine working at high temperature & load is |
| A. | grease |
| B. | solid lubricant |
| C. | animal oils |
| D. | mineral oils |
| Answer» C. animal oils | |
| 1335. |
Galena is an ore of |
| A. | iron |
| B. | copper |
| C. | lead |
| D. | aluminium |
| Answer» D. aluminium | |
| 1336. |
Triple point of water is |
| A. | 0°F |
| B. | 492°R |
| C. | 0°K |
| D. | -273°C |
| Answer» B. 492¬∞R | |
| 1337. |
Eutectoid reaction for iron-carbon system occurs at a temperature of __________ °C.$ |
| A. | 597 |
| B. | 959 |
| C. | 1147 |
| D. | 1493 |
| Answer» E. | |
| 1338. |
Desert air coolers being rendered ineffective in rainy season is due to |
| A. | low humidity |
| B. | low temperature |
| C. | high humidity |
| D. | sunny weather |
| Answer» D. sunny weather | |
| 1339. |
The elastic strain in copper is due to the |
| A. | motion of dislocations. |
| B. | stretching of atomic bonds. |
| C. | breakage of atomic bonds. |
| D. | none of the above. |
| Answer» B. stretching of atomic bonds. | |
| 1340. |
Steel balls are manufactured by cold heading. After cold forming, they are subjected to |
| A. | tempering |
| B. | normalising |
| C. | stress-relieving |
| D. | artificial ageing |
| Answer» D. artificial ageing | |
| 1341. |
Exposure to __________ accelarates the degradation of plastics. |
| A. | ultraviolet radiation |
| B. | high atmospheric temperature |
| C. | high ambient temperature |
| D. | damp atmosphere |
| Answer» B. high atmospheric temperature | |
| 1342. |
Melting point & boiling points of liquid oxygen are respectively - 218.8°C & - 183°C, while the same for liquid nitrogen is - 210°C & - 195.8°C respectively. The difference in melting points of liquid oxygen & liquid nitrogen is not equal to 8.8$ |
| A. | °C |
| B. | °F |
| C. | °K |
| D. | °R |
| Answer» C. ¬∞K | |
| 1343. |
__________ stress can not be sustained by a fluid in equilibrium. |
| A. | Shear |
| B. | Tensile |
| C. | Compressive |
| D. | none of these |
| Answer» B. Tensile | |
| 1344. |
The entropy change for a spontaneous process is |
| A. | > 0 for the system. |
| B. | < 0 for the system. |
| C. | > 0 for the system & the surrounding. |
| D. | < 0 for the system & the surrounding. |
| Answer» E. | |
| 1345. |
Out of the following, the __________ pipe has the least corrosion resistance. |
| A. | mild steel |
| B. | copper |
| C. | cast iron |
| D. | wrought iron |
| Answer» E. | |
| 1346. |
Induced draft fans provided in large thermal power plant boilers have __________ blades. |
| A. | forward curved |
| B. | backward curved |
| C. | double curved |
| D. | radial or straight |
| Answer» C. double curved | |
| 1347. |
Solidification time of a molten metal in a casting is proportional to (where, V = volume of metal & A = its surface area ; in the casting) |
| A. | V/A |
| B. | V/A2 |
| C. | V2/A |
| D. | V2/A2 |
| Answer» E. | |
| 1348. |
Production of one ton of paper in Indian paper industry consumes about __________ kWh of electricity. |
| A. | 300 |
| B. | 800 |
| C. | 1400 |
| D. | 2000 |
| Answer» D. 2000 | |
| 1349. |
Tungsten in high speed steel is responsible for its |
| A. | toughness & wear resistance |
| B. | cold hardness |
| C. | hot hardness |
| D. | sharp cutting edge |
| Answer» D. sharp cutting edge | |
| 1350. |
Even minute presence of impurities in copper impairs its electrical conductivity seriously. Electrolytic refinning of blister copper is resorted to, when |
| A. | cheap electricity is available. |
| B. | the precious metal content of copper is high. |
| C. | there is a demand for ultrapure (99.99%) electrolytic copper. |
| D. | all (a), (b) & (c). |
| Answer» E. | |