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230+ Metallurgy Solved MCQs

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .

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201.

In grey cast iron, carbon is present in the form of

A. Cementite
B. Flakes
C. Powder
D. Spheroids
E. None of the above
Answer» B. Flakes
discuss
202.

Which of the following affects the hardenability of steel?

A. Austenitic composition
B. Austenitic grain size
C. Amount, nature and distribution of undissolved or insoluble particles in austenite
D. All of the above
E. Low specific heat of quenching oil
Answer» D. All of the above
discuss
203.

Electric process for steel making is used in which of the following steel plant?

A. Bhilai
B. Bokaro
C. Durgapur
D. TISCO
E. None of the above
Answer» E. None of the above
discuss
204.

In a diamagnetic material the effect of an applied magnetic field is that

A. A net dipole moment is induced in the material
B. There is a net reduction in flux density
C. The induced magnetism is in opposition to applied field
D. All of the above
E. None of the above
Answer» D. All of the above
discuss
205.

In tool steel the percentage of silicon is usually restricted to

A. 1 percent
B. 2 percent
C. 0.5 percent
D. 0.2 percent
E. 5 percent
Answer» D. 0.2 percent
discuss
206.

The highest rate of quenching is possible in

A. Cold furnace
B. Oil
C. Air
D. Water
E. Hot furnace
Answer» D. Water
discuss
207.

There are 14 atoms in a unit cell of

A. Body centred cubic space lattice
B. Face centred cubic space lattice
C. Close packed hexagonal space lattice
D. All of the above
E. None of the above
Answer» B. Face centred cubic space lattice
discuss
208.

Coarse grained steels

A. Are less tough
B. Are less liable to distortion
C. Have poor machinability
D. Have leser depth hardening power
E. None of the above
Answer» A. Are less tough
discuss
209.

Normal mercury thermometer can be used upto

A. 300?C
B. 500?C
C. 100?C
D. 800?C
E. 212?C
Answer» A. 300?C
discuss
210.

During heat treatment the formation of thick layer of scale on the surface of steel articles is mainly due to

A. oxidation
B. excessive hardness
C. Low specific heat of quenching oil
D. coarse grain structure
E. reduction
Answer» A. oxidation
discuss
211.

Ultimate tensile strength is least in case of

A. Cast iron
B. Mild steel
C. Wrought iron
D. High carbon steel
E. Low carbon steel
Answer» A. Cast iron
discuss
212.

An instrument which is used for measuring temperature variations by change in a metallic resistance is called a

A. thermo-generator
B. Thermo-galvanometer
C. Thennocouple
D. Thermopile
E. Bolometer
Answer» E. Bolometer
discuss
213.

White metal contains

A. Mercury and zinc
B. Copper, zinc and mercury
C. Lead and copper
D. Lead and bismuth
E. Lead and zinc
Answer» D. Lead and bismuth
discuss
214.

For acid resistance cast iron should have silicon percentage of

A. 1 percent
B. 15 percent
C. 10 percent
D. 25 percent
E. 2 percent
Answer» B. 15 percent
discuss
215.

Which of the following gives granular fracture?

A. Steel
B. Wrought iron
C. Cast iron
D. All of the above
E. None of the above
Answer» A. Steel
discuss
216.

The crystal structure of alpha iron is

A. BCC
B. FCC
C. HCC
D. Cubic
E. None of the above
Answer» A. BCC
discuss
217.

Which of the following operation on grey cast iron will result in the production of white cast iron?

A. Rapid heating
B. Tumbling
C. Tempering
D. Shot peening
E. Rapid cooling
Answer» A. Rapid heating
discuss
218.

A solder consists of

A. Tin and antimony
B. Tin and white metal
C. Lead and tin
D. Zinc and lead
E. Zinc and tin
Answer» C. Lead and tin
discuss
219.

Ferrites are a sub-group of

A. Ferromagnetic materials
B. Ferrimagnetic materials
C. Diamagnetic materials
D. Paramagnetic materials
E. None of the above
Answer» B. Ferrimagnetic materials
discuss
220.

Which of the following material is added to cast iron to obtain nodular cast iron?

A. Chromium
B. Copper
C. Magnesium
D. Manganese
E. Molybdenum
Answer» C. Magnesium
discuss
221.

Pure iron has the structure of

A. Ferrite
B. Pearlite and austenite
C. Pearlite
D. Austenite
E. Pearlite, austenite and ferrite
Answer» A. Ferrite
discuss
222.

A hardness value of 1400 BHN can be expected in case of

A. Cementite
B. Ferrite
C. Pearlite
D. All of the above
E. None of the above
Answer» A. Cementite
discuss
223.

During first charge in cupola the time taken by material to melt is approximately

A. 2
B. 5 to 6 hours
C. 10 minutes
D. 1 hour
E. Half an hour
Answer» A. 2
discuss
224.

Chromium percentage in cutlery stainless steel is

A. 11 - 13 percent
B. 18 - 20.5 percent
C. 6 - 8 percent
D. 15 - 18 percent
E. 8 - 10 percent
Answer» E. 8 - 10 percent
discuss (1)
225.

Percentage of carbon is least in case of

A. Pig iron
B. Wrought iron
C. Malleable iron
D. Cast iron
E. Steel
Answer» B. Wrought iron
discuss
226.

Slow plastic deformation of metals under a constant stress is known as

A. Endurance failure
B. Proof deformation
C. Creep
D. Gradual deformation
E. Fatigue
Answer» C. Creep
discuss
227.

The chemical formula of cementite is

A. FeC3
B. Fe2C3
C. FeC
D. Fe3C2
E. Fe3C
Answer» E. Fe3C
discuss
228.

A steel specimen is heated to 730?C and cooled at the slowest possible rate in the furnace. Which property will be imparted to the steel piece?

A. Low specific heat of quenching oil
B. Tempering
C. Softness
D. Toughness
E. Hardness
Answer» C. Softness
discuss
229.

Insufficient hardness after tempering may be due to

A. tempering temperature too low
B. tempering temperature too high
C. oxidising atmosphere in the furnace
D. Any of the above
E. Low specific heat of quenching oil
Answer» B. tempering temperature too high
discuss
230.

Which of the following element has hexagonal close packed structure?

A. Molybdenum
B. Cadmium
C. Chromium
D. Lead
E. Aluminium
Answer» B. Cadmium
discuss
231.

Brass in an alloy of

A. Copper and lead
B. Copper and tin
C. Copper and nickel
D. Copper and aluminium
E. Copper and zinc
Answer» E. Copper and zinc
discuss
232.

Which of the following metals has highest specific gravity?

A. Silver
B. Copper
C. Iron
D. Aluminium
E. Brass
Answer» A. Silver
discuss
233.

Which of the following material is generally not used as deoxidiser for producing killed steel?

A. Copper
B. Ferro-silicon
C. Ferro-manganese
D. Aluminium
E. All of the above
Answer» A. Copper
discuss
234.

The net magnetic moment is zero is case of

A. Ferromagnetic materials
B. Ferrimagnetic materials
C. Anti-ferromagnetic materials
D. All of the above
E. None of the above
Answer» C. Anti-ferromagnetic materials
discuss
235.

In Brinell hardness tester the load for aluminium is

A. 1000 kg
B. 500 kg
C. 300 kg
D. 100 kg
E. 1500 kg
Answer» B. 500 kg
discuss
236.

The nature of atomic bond found in diamond is

A. Ionic
B. Covalent
C. Metallic
D. Either of above
E. None of the above
Answer» B. Covalent
discuss
237.

Annealing treatment is normally used for

A. Forgings
B. Cold worked sheets
C. Wires
D. Castings
E. All of the above
Answer» E. All of the above
discuss
238.

During dielectric heating, the heat is generated primarily due to

A. Eddy currents
B. High voltage
C. High flux density
D. High power consumption
E. Stray magnetic fields
Answer» A. Eddy currents
discuss
239.

For each ton of pig iron produced in a blast furnace, the amount of ore used is approximately.

A. 1 ton
B. 13 tons
C. 5 tons
D. 2 tons
E. 12.5 tons
Answer» D. 2 tons
discuss

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