MCQ
681. The pointer of an indicating instrument is generally made of—
copper
silver
aluminium
soft steel
682. The austenitic stainless steel centrums-
18% chromium and 8% nickel
8% chromium and 18% nickel
14% nickel and 0.35% carbon
14% nickel and 0.35% carbon
683. The carbon in the pig iror varier from-
0.1 to 0.5%
1 to 5 %
0.5 to 15%
5 to 10%
684. Which is binding material?
Sand
Cement
Khoa
Rod
685. What is used as joining medium in brazing operation?
Copper-Zinc alloy
Lead-Tin alloy
Nickel-Silver alloy
All of the above
686. Drop forging dies contain carbon of the order of --
0.1 to 0.2%
0.25 0.5%
0.6 to 0.7%
0.7 to 0.9%
687. Cast-iron is--materia.
Ductile
Malleable
Brittle
Tough
688. The usual composition of a soldering alloy is--
tin and lead
Tin, lead and small percentage of antimony
tin, lead and silver
tin and copper
689. Copper when alloyed with Zinc is known as –
Brass
gun metal
bronge
nicrome
690. Iron carbon alloy containing carbon --4.3% carbon are known as hyper-eutectic cast Irons.
usual to
more than
less than
none of them
691. The material commonly used for machine tool bodies is-.
mild steel
brass
aluminium
cast iron
692. Muntz metal (yellow brass) contains—
70% copper and 30% zinc
60% copper and 40% zinc
60% copper and 30% zinc
60.45% copper, 35.2% zinc and 5.35% nickel
693. A steel with carbon is --known as hyper- eutectoid steel--
0.87%
below 0.8%
above 0.8%
None of them
694. In the lower part of the blast furnace (Zone of fusion) the temperature is—
800-1000°C
1500-1700°C
400-700°C
1200-1300°C
695. Taps, dies and drills contain carbon-
below 0.5%
below 1%
above 1%
above 2.2%
696. Silicon in cast iron-
Incrouse hardness and brittleness
Maker the iron write and hard
Aids fusibility and fluidity
Makes the iron soft and easily Machinable
697. Shock resistance of steel in increased by adding--
Nickel
Chromium
Nickel and chromium
Sulphur load and phosphorus
698. Brass is an alloy of--
Copper and Tin
Copper, Tin and Phosphorous
Zinc, Copper, Tin and Phosphorous
Zinc and Copper
699. Nodular cast iron is produced by adding the molten cast iron-
Nickel
Copper
Chromium
Magnesium
700. Which of the following impunity in the cast iron promoter graphite module formation and increase the fluidity of the molten metal?
Sulphur
Manganese
Phorphorus
Silicon