341. Cementite is in the lamellar form in the _____________________ phase of steel ?
A. Martenistic
B. Bainitic
C. Pearlitic
D. Ferritic

342. Brazing is the joining of metals_____________________?
A. Without melting the base metal
B. With a non-ferrous filler
C. Both A. & B.
D. Neither A. nor (B)

343. Midrex process of sponge iron production uses reformed natural gas as the reducing agent, which uses iron ore in the form of_________________?
A. Lumps
B. Pellets
C. Briquettes
D. Sinter

344. Specific gravity of a metal, which weighs 5 kg in air and 4 kg when submerged in water, will be_____________________?
A. 5
B. 1.25
C. 2.5
D. 3.75

345. Which of the following low melting alloy containing bismuth and lead is used for electric fuse ?
A. Wood’s metal
B. Babbitt metal
C. Monel metal
D. Duralumin

346. Carbide tipped cutting tools are manufactured by powder metallurgy techniques and have a composition of_____________________?
A. 90% tungsten carbide and 10% cobalt
B. 70% aluminium oxide & 30% silica
C. 30% nickel, 15% chromium & 55% tungsten
D. 65% tungsten & 35% zirconium

347. The mechanism which changes the value of manipulated variable in response to the output signal from the control unit is called the___________________?
A. Final control element
B. On-off control
C. Floating control action
D. None of these

348. The substance used as a smoke screen in warfare is___________________?
A. C2H2
B. SiCl4
C. P2O5
D. PCl5

349. Increasing sulphur content in pig iron tends to make it ________________?
A. Soft
B. Hard
C. Tough
D. Ductile & malleable

350. Fahrenheit and Centigrade scales have the same readings at _____________________?
A. -55°
B. -40°
C. -33°
D. -58°

NOTE
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