chemical engineering chemical engineering basics Mcqs
251. Cobalt 60 is used as a source of _____________ in medical therapy & industrial radiography?
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A. X-rays

B. ?-rays

C. ?-rays

D. ?-rays

252. ______________________ iron is produced by the annealing of white cast iron?
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A. Grey

B. Ductile

C. Nodular

D. Malleable
253. The difference between gross & net calorific values of fuel is due to the___________________?
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A. Heat carried away by the steam from the moisture content of the fuel

B. Heat lost by radiation

C. Sensible heat carried away by the flue gases

D. Heat carried away by steam from the combustion of hydrogen in the fuel
254. Induced draft fans provided in large thermal power plant boilers have __________________ blades?
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A. Forward curved

B. Radial or straight

C. Backward curved

D. Double curved

255. Normalising of an object does not________________________?
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A. Improve yield strength

B. Improve mechanical properties

C. Improve ductility

D. Refine coarse grain structure obtained during hot working

256. Reduction in the grain size reduces the _________________ of the material?
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A. All A, B. & C

B. Tensile strength

C. Fatigue resistance

D. Creep resistance

257. Energy of the sun arises mainly from __________________ reactions?
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A. Fusion

B. None of these

C. Fission

D. Combustion

258. A jig is used while __________________ a hole?
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A. Drilling

B. Boring

C. Counter boring

D. Enlarging

259. Cascade control is___________________?
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A. The continuous adjustment of the set point index of an automatic control loop by a primary(master) controller

B. Used when changes in process conditions cause serious upsets in the controlled variable

C. All A, B & C

D. Useful to control flow from temperature

260. _________________ is the most suitable lubricant for drawing mild steel wires?
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A. Water

B. Kerosene

C. Sodium stearate

D. Lime water

261. In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that ?
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A. Maintaining vacuum on tube side is more difficult than that on the shell side

B. ause of its lower specific volume compared to steam

C. Water velocity can be increased conveniently to increase the overall heat transfer co-efficient

D. Compared to the mass flow rate of cooling water, the rate of condensation of steam is

E. ariably smaller

F. Condenser can act as a storage unit for condensed steam

262. Lead is poured into the joints between two ___________________ pipes?
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A. Steel

B. Plastic

C. Concrete

D. Cast iron
263. Powder metallurgy is used to produce__________________?
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A. Components of such alloys whose constituents do not form alloys readily

B. Components of large size

C. Porosity free components

D. High precision components with complex cavities and sharp features

264. In troposphere (the weather domain), the temperature t at height h above the sea level in metres is given by (where, temperature at sea level is 15C and t is in C.) ?
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A. t = 15 0.0035 h

B. t = 0.0035 h 15

C. t = 15 + 0.0065 h

D. t = 15 0.0065 h
265. Direct conversion of thermal energy to electrical energy is facilitated by the____________________?
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A. Magneto hydrodynamic generator

B. Fuel cells

C. Photo voltaic cell

D. None of these

266. A material in which the atoms are arranged regularly in some directions but not in others, is termed as mesomorphous material; an example of which is_________________?
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A. Lead

B. Silver

C. Glass

D. Mica

267. One ton of refrigeration is not equivalent to the heat removal rate of ____________________?
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A. 50 kcal/minute

B. 3.5 KW

C. 50 kJ/sec

D. 200 BTU/minute

268. Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as______________________?
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A. Re-0.8, Re0.5

B. Re0.5, Re0.8

C. Re0.8, Re-0.5

D. Re0.8, Re0.5
269. Primary designation of steel is based on its__________________?
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A. Carbon content

B. Hardness & tensile strength

C. Iron content

D. Alloying elements content
270. In the blast furnace, incorporation of water vapour in the blast gives the following effect ?
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A. No significant change occurs

B. Increases the hydrogen content in the metal

C. Increases the flame temperature

D. Increases the reducing potential of the gas
271. Suitability of steel for its use in cable is judged by its strength in__________________?
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A. Compression

B. Shear

C. Tension

D. Torsion

272. Which of the following does not have a sharp melting point ?
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A. Pig iron

B. Ice

C. Thoria

D. Glass
273. Fire refining process is employed in case of___________________?
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A. Copper

B. Tin

C. Zinc

D. Aluminium

274. Copper deposits are found in India at the following location ?
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A. Ramagundam

B. Kudremukh

C. Kolar

D. Khetri
275. ____________ test is the appropriate test to determine whether a material is ductile or brittle ?
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A. Impact

B. Tensile

C. Hardness

D. Cupping

276. The most important function of a washer is to provide bearing area and washers are normally specified by their hole diameters. The diameter of washer as compared to the nut is__________________?
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A. Less

B. More

C. More but less than the diameter of bolt

D. Same

277. Dies for wire drawing are generally made of__________________?
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A. Carbides

B. Mild steel

C. High carbon steel

D. Stainless steel

278. The transition temperature at which all the ferromagnetic materials become paramagnetic materials is termed as the Curie temperature. Its value for cobalt is ______________ C?
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A. 768

B. 1480

C. 1127

D. 1359

279. _____________ glass is used in the mercury in glass thermometer meant for measuring a temperature of 500C ?
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A. Supermax

B. Borosilicate

C. Lead

D. High silica

280. __________________ fluid force is not considered in the Navier-Stokes equation?
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A. Gravity

B. Pressure

C. Viscous

D. Turbulent
281. Hollow shafts can be made as strong as solid shafts by making the twisting moments of both the shafts same. Shafts made by _____________ have residual stresses ?
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A. Cold rolling

B. Hot rolling

C. Forging

D. Casting

282. Which of the following alloying elements is present in maximum percentage in high speed steel ?
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A. Molybdenum

B. Chromium

C. Tungsten

D. Vanadium

283. Tin based white metals are used, where bearings are subjected to___________________?
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A. High temperature

B. High pressure & load

C. Low pressure & load

D. Large surface wear

284. Wrought iron is never shaped by__________________?
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A. Cold working

B. Casting

C. Forging

D. Welding

285. The elastic strain in copper is due to the__________________?
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A. Stretching of atomic bonds

B. Motion of dislocations

C. Breakage of atomic bonds

D. None of the above

286. The normal stress is the same in all directions at a point in a fluid, only when the fluid__________________?
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A. Is at rest & has zero viscosity

B. is incompressible & frictionless

C. Is frictionless

D. Fluid layer has no motion relative to an adjacent layer of fluid

287. Change in volume of metals from absolute zero temperature to their melting points is___________________?
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A. Almost same for all metals

B. Different for different metals

C. Less for low melting point metals

D. Less for high melting point metals

288. What is the pH of distilled water ?
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A. 14

B. 7

C. 0

D. 1

289. Use of water as a manometric liquid suffers from the disadvantage of its____________________?
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A. Corrosive nature

B. High vapour pressure

C. High boiling point

D. Low vapour pressure

290. _____________________ of austenite decreases the hardenability in steel ?
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A. Homogeneity

B. Dissolved elements (except cobalt)

C. Fine grains

D. Coarse grains

291. ____________________ of hard alloy and tool steel is done to make it easily machinable ?
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A. Tempering

B. Normalising

C. Annealing

D. Case carburising

292. Steel balls are manufactured by_____________________?
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A. Casting

B. Cold heading

C. Sintering

D. Spinning

293. The product (s) of roasting of a sulphide ore is (are) ?
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A. Sulphate only

B. Oxide only

C. Dependent on temperature and partial pressure of oxygen & sulphur dioxide

D. Oxide and sulphate

294. Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about ____________________?
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A. 29:01:00

B. 23:01

C. 9:01

D. 17 : 1
295. Shrinkage allowance on pattern is provided to compensate for shrinkage when the _____________________?
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A. Solid phase temperature drops from freezing temperature to the room temperature

B. Liquid metal temperature drops from pouring temperature to room temperature

C. Metal changes from liquid state to solid state at freezing temperature

D. Liquid metal temperature drops from pouring temperature to freezing temperature

296. High relative humidity decreases the evaporative process and as the temperature is increased, the relative humidity decreases. The comfort range for human body is the ambient temperature of 22 to 27C with relative humidity ranging from _______________ percent ?
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A. 15 to 25

B. 45 to 50

C. 75 to 80

D. 5 to 10

297. Atomic _________________ of an element is a whole number ?
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A. Weight

B. Number

C. Volume

D. Radius

298. Strain hardening effect in metals subjected to cold working is due to the _______________ mechanism?
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A. Dislocation

B. Slip

C. Fracture

D. Winning

299. Carbon supply in pack carburising process is in the form of ___________________?
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A. Charcoal

B. Graphite

C. Hydrocarbon oil

D. Calcium carbide

300. The approximate height of a blast furnace having a useful volume of 2000 m3 is about _______________ metres ?
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A. 25

B. 75

C. 35

D. 55