Metallurgy Set 4 MCQs

Q1 | During heat treatment, deformation and volume changes can be minimised by

slowly cooling in the martensitic range

using surface hardening when possible

using alloy steels least prone to such changes

Any of the above

Low specific heat of quenching oil

Q2 | Spherical metal powders are usually produced by

Milling

Electrolytic process

Oxidation

Automization

Reduction

Q3 | In Brinell hardness testing the timer for loading is

15 seconds

1 second

5 seconds

1 minute

2 seconds

Q4 | The stainless steels owe their resistance to corrosion to the presence of

Chromium

Carbon

Sulphur

Manganese

Nickel

Q5 | The effect of austenitic grain size development during heat treatment is

lower hardenability

greater toughness

lower internal stress

All of the above

Low specific heat of quenching oil

Q6 | Warping may be avoided when quenching a long slender piece of work by

Holding the work piece between clamps and pouring water on it

Hoding the work piece vertically over the quenching bath and plunging it straight

Pulling the piece from both ends

Holding the piece horizontally in adequate supports

None of the above

Q7 | Which of the following is not a hardening process?

Nitriding

Carburising

Cyaniding

Sphcroidizing

Induction hardening

Q8 | The maximum percentage of carbon in austenite is

2%

2.70%

1.70%

0.07%

0.70%

Q9 | Nichrome contains

Nickel, lead and zinc

Nickel and copper

Nickel and chromium

Nickel, copper and vanadium

Nickel, chromium and vanadium

Q10 | Free cutting steels usually have sulphur content of

0.02 percent

0.21 percent

2 percent

10 percent

0.002 percent

Q11 | Fusible plug for boilers consists of

Zinc, bismuth and tin

Lead, tin and mercury

Copper, lead and tin

Bismuth, lead and tin

Zinc, copper and lead

Q12 | Stellite contains

Nickel, zinc and aluminium

Nickel, copper and zinc

Cobalt, chromium and tungsten

Copper, tin and lead

Cobalt, vanadium and nickel

Q13 | For producing cast iron pipes by centrifugal casting method the core used is

Wax core

Clay core

Metallic core

Sand core

No core is used

Q14 | Mild steel has the structure of

BCC

Cubic

FCC

HCC

Orthorhombic

Q15 | Which of the following furnace is used to convert liquid pig iron into steel?

Open hearth furnace

Cupola

Converter

Induction arc furnace

Low specific heat of quenching oil

Q16 | Lowest melting point may be expected for

Brass

Lead

Zirconium

Copper

Aluminium

Q17 | Which of the following is easiest to bend?

Grey pig iron

Wrought iron

Mottled pig iron

Cast iron

Steel

Q18 | Dilute nitric acid applied to a clean fracture of white cast iron will produce

Grey stain

Black stain

Pink stain

White stain

Brown stain

Q19 | Plasticisers are added to plastic compounds to

Improve resistance to acids

Provide a protective layer

Improve resistance to alkalies

Increase tensile strength

Improve softness and flexibility

Q20 | The process of providing zinc coating on steel pipes is known as

Cold working

Pickling

Galvanising

Blistering

Spheroidising

Q21 | Th phenomenon of emf development between two diferent metals placed in contact is known as

Kelvin effect

Thomson effect

Seeback effect

Peltier effect

Thermocouple effect

Q22 | Hardening by carburizing is limited to

2 mm

5 mm

0.05 mm

Low specific heat of quenching oil

0.1 mm

Q23 | Which of the following is by product from blast furnace?

Slag

Flue dust

Blast furnace gas

All of the above

None of the above

Q24 | Which of the following is not true in case of white cast iron

It is strong

It is brittle

It is malleable

It is whitish in colour

It is hard

Q25 | Which iron ore has least percentage of iron

Magnetite

Limonite

All have almost equal percentage of iron ore

Siderite

Hematite