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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 .

101.

Which of the following is usually made of dead mild steel?

A. Flanges
B. Shafts
C. Spades
D. Gears
E. Fish plates
Answer» A. Flanges
102.

The fastest cooling rate is achieved when steel is quenched in

A. Brine
B. Soldering
C. Oil
D. Water
E. Air
Answer» A. Brine
103.

An operation on steel aimed at softening the steel to improve machinability is known as

A. Annealing
B. Cold working
C. Softening
D. Temperature
E. Shot blasting
Answer» A. Annealing
104.

Which of the following material can bear sudden and excessive shocks better?

A. White iron
B. Pig iron
C. Wrought iron
D. All have same shock bearing capacity
E. Cast iron
Answer» C. Wrought iron
105.

The process for steel making used at TISCO, Jamshedpur is

A. Duplex process
B. Open hearth process
C. Bessemmer process
D. L-D process
E. Electric process
Answer» A. Duplex process
106.

In Brinell hardness testing the minimum thickness of the specimen should be

A. More than 10 times the depth of impression
B. Less than 10 times the depth of impression
C. Less than 5 times the depth of impression
D. Thickness of specimen has no relevance to the depth of impression
E. Equal to 10 times the depth of impression
Answer» A. More than 10 times the depth of impression
107.

Vicker's hardness number of diamond could be of the order of

A. 8000
B. 800
C. 4000
D. 15000
E. 12000
Answer» A. 8000
108.

Carbon percentage in cutlery stainless steel is

A. 1.35 to 1.65 percent
B. 1.1 to 1.35 percent
C. 1 percent
D. 0.76 to 0.80 percent
E. 0.25 to 0.30 percent
Answer» E. 0.25 to 0.30 percent
109.

The crystal structure of gamma iron is

A. BCC
B. Combination of all above
C. ACP
D. Cubic
E. FCC
Answer» E. FCC
110.

High carbon steels intended to be quenched in water should have manganese percentage less than

A. 1.5 percent
B. 0.5 percent
C. 2 percent
D. 1 percent
E. No manganese percent
Answer» B. 0.5 percent
111.

A fine grained steel will have the number of grains per square centimeter as

A. 100 to 150
B. 150 to 1000
C. 16 to 56
D. 3 to 16
E. 56 to 100
Answer» D. 3 to 16
112.

Uniformity of zinc coating on pipes is tested by

A. Dipping the sample in water
B. Dipping the sample for 10 minutes in calcium hydroxide solution
C. Dipping the sample for 1 minute in conc, hydrochloric acid
D. Dipping the sample for 1 minute in neutral copper sulphate solution
E. By passing electric current for 1 hour
Answer» D. Dipping the sample for 1 minute in neutral copper sulphate solution
113.

Which of the following materials are usually most ductile?

A. Amorphous
B. Face centred cubic lattice
C. Non-metallic
D. Body centred lattice
E. Hexagonal close-packed lattice
Answer» B. Face centred cubic lattice
114.

In grey cast iron, free graphite is in the form of

A. Fine powder
B. Needles
C. Nodules
D. Crystals
E. Flakes
Answer» E. Flakes
115.

Volume of air required to melt one ton of cast iron in a cupola at N.T.P. is roughly

A. 10000 cubic metres of air
B. 10 cubic metres of air
C. 100000 cubic metres of air
D. 100 cubic metres of air
E. 1000 cubic metres of air
Answer» D. 100 cubic metres of air
116.

The property of a metal when the recovery after unloading is complete but not instantaneous is

A. 9
B. Viscoelasticity
C. Inelasticity
D. Anelasticity
E. creep
Answer» D. Anelasticity
117.

Standard electrical resistance are made of

A. Invar
B. Manganin
C. Tungsten
D. Phosphor bronze
E. Constantan
Answer» E. Constantan
118.

A chisel for cutting steel plates is usually

A. Hardened and tempered
B. Annealed
C. Hardened
D. Tempered
E. Tempered and annealed
Answer» A. Hardened and tempered
119.

Cracks of a vertical nature and dark coloured fissures in a sample of hardened steel indicate that

A. Steel has not been properly heated
B. Steel has been burned
C. Steel contains excessive alloying elements
D. Steel has been properly hardened
E. Steel has achieved maximum possible hardness in accordance with the carbon percentage
Answer» B. Steel has been burned
120.

Which of the following material is viscoelastic in properties?

A. Graphite
B. Rubber
C. Glass
D. Cork
E. None of the above
Answer» B. Rubber
121.

Brinell hardness of nitrided surface may be of the order of

A. More than 600
B. 200 to 250
C. 300 to 450
D. 150 to 200
E. 100
Answer» A. More than 600
122.

If a medium carbon hardened steel shows pearlite structure it may be concluded that

A. Steel contains impurities
B. Presence of cementite
C. Steel has been quenched in oil
D. Steel has been quenched in water
E. Steel has been slowly cooled in furnace
Answer» E. Steel has been slowly cooled in furnace
123.

Alpha brass is a (an)

A. Inermediate phase
B. Interstitial compound
C. Substitutional solid solution
D. None of the above
E. 2.10%
Answer» C. Substitutional solid solution
124.

Which of the following is a non-destructive test?

A. Tensile test
B. Cupping test
C. Charpy test
D. X-ray test
E. Izod Impact test
Answer» D. X-ray test
125.

For each ton of pig iron produced in blast furnace, the quantity of coke required would be roughly

A. 0.5 ton
B. 0.25 ton
C. 1.4 ton
D. 1.9 ton
E. 0.1 ton
Answer» C. 1.4 ton
126.

Warping of articles during heat treatment may be due to

A. internal stresses in the article before heating
C. Low specific heat of quenching oil
D. non-uniform cooling
E. non-uniform heating
Answer» A. internal stresses in the article before heating
127.

In eddy current heating of steel, if the depth of heating is to be increased

A. Voltage should be high
B. Some resisting material must be applied on the surface of article to be heated
C. Frequency must be low
D. Time of heating should be high
E. Frequency must be high
Answer» C. Frequency must be low
128.

The maximum percentage of carbon in ferrite is

A. 0.25%
B. 0.03%
C. 0.00%
D. 0.04%
E. 0.13%
Answer» B. 0.03%
129.

The percentage of carbon in cold rolled steel sheets is around

A. 2.10%
B. 0.01%
C. 0.80%
D. 0.10%
E. 1.10%
Answer» D. 0.10%
130.

In a specimen of hardened steel, hard and soft spots indicate

A. Presence of pearlite
B. Fre carbon
C. Presence of cementite
D. Uneven heating
E. Non-uniform composition of steel
Answer» D. Uneven heating
131.

A steel piece after hardening is heated to 300?C and then cooled in oil. The property imparted to the steel piece will be

A. Hardness
B. Annealing
C. Low specific heat of quenching oil
D. Toughness
E. Softness
Answer» D. Toughness
132.

Killed' steel is

A. Steel with less than normal percentage of carbon
B. Steel which has been shaped on a power hammer
C. That steel which is deoxidised in the ladle with silicon and aluminium
D. Steel with more than normal percentage of carbon
E. Steel that has lost its properties due to excessive alloying
Answer» C. That steel which is deoxidised in the ladle with silicon and aluminium
133.

Which of the following metal has the lowest specific gravity?

A. Cast iron
B. Monal metal
C. Copper
D. Bronze
E. Magnesium
Answer» E. Magnesium
134.

The crystal structure of most of the common metals is

A. Hexagonal
B. Cubic
C. Orthorhombic
D. Any of the above
E. None of the above
Answer» B. Cubic
135.

Iron ore which is grey to black in colour and is hard and magnetic, is known as

A. Hematite
B. Siderite
C. Ironite
D. Limonite
E. Magnetite
Answer» E. Magnetite
136.

The slowest cooling rate is achieved when steel is quenched in

A. mixture of water
B. Air
C. Brine
D. fused salt
E. Hardened and tempered
Answer» B. Air
137.

Which of the following material does not have body centred cubic structure?

A. Vanadium
B. Chromium
C. Zirconium
D. Lithium
E. Potassium
Answer» C. Zirconium
138.

The crystal structure of brass is

A. Mixture of all above
B. BCC
C. FCC
D. Orthorhombic
E. HCP
Answer» C. FCC
139.

Which of the following material is used for thermocouple junction?

A. Magnanin
B. Nichrome
C. Invar
D. Petwar
E. White metal
Answer» A. Magnanin
140.

If a sample of steel shown excessive hardness after tempering the probable cause could be

A. Insufficient holding time during tempering
B. Excessive proportion of alloying elements
C. High temperature during tempering
D. Change in volume during cooling
E. None of the above
Answer» A. Insufficient holding time during tempering
141.

Which of the following is usually not a constituent of paints?

A. Career
B. Vehicle
C. Pigment
D. Drier
E. None of the above
Answer» A. Career
142.

Magnetism is non-linearly related to the applied field in case of

A. Diamagnetic field
B. Paramagnetic field
C. Ferromagnetic field
D. All of the above
E. None of the above
Answer» C. Ferromagnetic field
143.

Above the curie temperature, a magnetic material becomes

A. Diamagnetic
B. Paramagnetic
C. Ferromagnetic
D. Dielectric
E. None of the above
Answer» B. Paramagnetic
144.

Which of the follwing is usually made of mild steel?

A. Drop forgings
B. Fish plates
C. Shear blades
D. Channels
E. Die blocks
Answer» D. Channels
145.

Bell metal is an alloy of

A. Copper and lead
B. Coper, tin, lead and zinc
C. Copper, antimony, aluminium and zinc
D. Copper and tin
E. Copper, lead and tin
Answer» D. Copper and tin
146.

Which of the following material has body centred cubic structure?

A. Magnesium
B. Cadmium
C. Glass
D. Zinc.
E. Molybdenum
Answer» E. Molybdenum
147.

The measurement junction of a thermocouple is taken from an environment of 300?C to 600?C. If time constant of the thermocouple is 1 second, temperature indicated by it, in ?C, after 1 second would be about

A. 400
B. 457
C. 497
D. 600
E. 100
Answer» C. 497
148.

Capacity of a cupola is expressed in terms of

A. Diameter of drum
B. Height of drum
C. Tons of castings it can produce in one charge
D. Tons of coke it can take in one charge
E. None of the above
Answer» C. Tons of castings it can produce in one charge
149.

If an article develops insufficient hardening after quenching, the defect can be corrected by

A. removing scale from surface
B. normalising or annealing followed by hardening
C. reheating the article in oxidizing atmosphere and quenching
D. Any of the above
E. Low specific heat of quenching oil
Answer» B. normalising or annealing followed by hardening
150.

Cast iron pipes are manufactured by

A. Centrifugal casting method
B. Die casting method
C. Lost wax method
D. Shell moulding method
E. Sand acting method
Answer» A. Centrifugal casting method

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