chemical engineering Mcqs
7203. A bearing metal should not have___________________?
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A. Low co-efficient of friction

B. Enough plasticity

C. High toughness

D. Low thermal conductivity
7204. Plastics are____________________?
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A. Non-biodegradable

B. Not suitable for drainage pipe manufacture

C. All A., B. & C.

D. Used in very high temperature applications

7205. Work hardening of a material ________________?
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A. Decreases its tensile strength

B. Increases its ductility

C. Does not affect its ductility

D. Decreases its ductility
7208. A chemical change takes place when iron_____________?
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A. Rusts

B. None of these

C. Is heated

D. Melts

7209. Common house hold glass (i.e., soda-lime glass) is a/an _____________ material?
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A. Fully crystalline

B. Amorphous

C. None of these

D. Partly crystalline
7211. Constantan used in thermocouples is an alloy of___________________?
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A. Copper & aluminium

B. Lead & tin

C. Iron & copper

D. None of these
7212. Tin vessels are corroded by____________________?
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A. None of these

B. Anhydrous ammonia

C. Synthetic detergent solution

D. Aromatic solvents

7214. The bomb in the bomb calorimeter is made of___________________?
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A. Mild steel

B. High silicon iron (14% Si)

C. Molybdenum stainless steel

D. Copper

7215. Constituents of stellite are__________________?
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A. Zinc, aluminium and nickel

B. Nickel, cobalt and vanadium

C. Cobalt, chromium and tungsten

D. Zinc, copper and nickel

7216. Ceramic materials fabrication cannot be done by__________________?
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A. Slip casting

B. Extrusion

C. Welding

D. Plastic pressing

7217. Which of the following undergoes granular fracture ?
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A. Wrought iron

B. Steel

C. None of these

D. Cast iron

7218. Which of the following is not an alloy of tin ?
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A. Soft solder

B. Pewter type metal

C. White-bearing metal

D. German silver
7219. Which of the following has the poorest weldability ?
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A. Mild steel

B. Wrought iron

C. Low carbon steel

D. High-carbon steel
7221. Brass tubes are used in the manufacture of tubes of evaporators used in sugar and salt industries, mainly because of its ______________________?
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A. All A., B. and C.

B. High co-efficient of thermal expansion

C. Low thermal conductivity

D. High corrosion resistance
7222. Pure nickel is___________________?
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A. Ferromagnetic at room temperature

B. Having h.c.p. crystal lattice

C. Not resistant to oxidation at high temperature

D. Ferromagnetic above its curie point (i.e., 415C)

7224. A magnetic material becomes ____________ above the Curie temperature?
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A. Paramagnetic

B. Ferromagnetic

C. Diamagnetic

D. None of these

7225. Softening of hardened steel is done by its_____________________?
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A. Carburising

B. Normalising

C. Tempering

D. Annealing

7226. Caustic soda is produced in a mercury cell having anode and cathode made respectively of moving mercury and_________________?
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A. Moving mercury and crimped steel wire

B. Moving mercury and graphite

C. Moving mercury and carbon

D. Graphite and moving mercury
7228. Which of the following alloys does not contain nickel ?
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A. Inconel

B. Chloro, et-2 alloy

C. Babbitt metal

D. Monel

7230. Atmospheric corrosion of metals result from their________________?
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A. Slow oxidation

B. Fast oxidation

C. Fast hydration

D. Slow dehydration

7231. _____________________ is used for determining the tensile strength of steels ?
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A. None of these

B. Universal testing machine

C. Hydraulic press

D. Mechanical press

7234. Alpha iron is stable ______________ C?
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A. Above 1403

B. Upto 910

C. Between 910 & 1403

D. Above 1800

7235. Galvanising (i.e., zinc coating) of steel sheets is done to______________________?
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A. Prevent its rusting by contact with corrosive atmosphere

B. Protect the base metal by cathodic protection

C. Both A. & B.

D. Neither A. nor B.

7236. Stainless steel is not corroded by _____________________?
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A. Sulphuric acid (10%)

B. Saturated brine

C. Hydrochloric acid (10%)

D. Nitric acid (10%)
7239. ______________ can replace tungsten in high speed steel ?
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A. Molybdenum

B. Vanadium

C. Chromium

D. Cobalt

7240. Pick the odd man out of the following?
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A. Nitriding

B. Calorising

C. Cyaniding

D. Pack carburising

7241. Most common stainless steel type 316, which is highly resistant to corrosion contains______________?
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A. 16-13% Cr 10-14% Ni and 2-3% Mo

B. 2-4% Cr, 22% NI and 2-4% Mo

C. None of these

D. 20-22% Cr, and 8-10% Ni

7242. Molybdenum steels containing 0.15 to 0.40% molybdenum___________________?
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A. Are prone to temper brittleness

B. Are used for automobile parts like gears, axle, shaft, bearings etc.

C. Have very poor fatigue resistance

D. Do not contain nickel or chromium or both

7243. Thermosetting polymers are_________________?
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A. Injection moulded

B. Extruded

C. Cast molded

D. None of these

7244. Which of the following contains maximum percentage of carbon ?
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A. Railway spring steel

B. Boiler plate steel

C. Rail steel

D. Saws for cutting steel
7245. German silver in an alloy of________________?
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A. Copper, aluminium and silver

B. Copper, nickel and zinc

C. Silver, nickel and zinc

D. Silver, zinc and aluminium

7246. Which of the following is not shipped in mild steel containers ?
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A. Ammonia

B. Acetone

C. Formic acid

D. Ethyl alcohol

7247. Ceramic materials are____________________?
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A. Always bad heat conductors

B. Always amorphous in nature

C. Stronger in compression than in tension

D. Organic in nature

7248. Cermets are used for making___________________?
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A. Cutting tools

B. Abrasives

C. Both A. & B.

D. Neither A. nor B

7250. Cast iron vessels are not suitable for the storage of_________________?
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A. Wet SO2

B. Freon

C. H2SO4 (fuming)

D. H2SO4 (95%) at room temperature