Multiple Choice Questions and Answers (MCQs) on Engineering Materials
01. Which one of the following metals would work-harden more quickly than the others?
(A) Copper
(B) Brass
(C) Lead
(D) Silver
Answer: Option B
02. Iron-carbon alloys containing carbon ________ 4.3% are known as hypereutectic cast irons.
(A) Equal to
(B) Less than
(C) More than
(D) None of these
Answer: Option C
03. Bell metal contains
(A) 70% copper and 30% zinc
(B) 90% copper and 10% ti
(C) 85 – 92% copper and rest tin with little lead and nickel
(D) 70 – 75% copper and rest tin
Answer: Option D
04. The temperature required for full annealing in hypereutectoid steel is
(A) 30°C to 50°C above upper critical temperature
(B) 30°C to 50°C below upper critical temperature
(C) 30°C to 50°C above lower critical temperature
(D) 30°C to 50°C below lower critical temperature
Answer: Option C
05. The composition of silver solder is
(A) Silver, copper, zinc
(B) Silver, tin, nickel
(C) Silver, lead, zinc
(D) Silver, copper, aluminium
Answer: Option A
06. When a steel containing ________ 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite.
(A) Equal to
(B) Less than
(C) More than
(D) None of these
Answer: Option B
07. Pipes for bicycle frames are made of
(A) Cold rolled steel
(B) Hot rolled steel
(C) Forged steel
(D) Cast steel
Answer: Option A
08. The charge of the blast furnace consists of
(A) Calcined ore (8 parts), coke (4 parts) and limestone (1 part)
(B) Calcined ore (4 parts), coke (1 part) and limestone (8 parts)
(C) Calcined ore (1 part), coke (8 parts) and limestone (4 parts)
(D) Calcined ore, coke and limestone all in equal parts
Answer: Option A
09. The following element can’t impart high strength at elevated temperature
(A) Manganese
(B) Magnesium
(C) Nickel
(D) Silicon
Answer: Option B
10. The percentage carbon content in wrought iron is about
(A) 0.02
(B) 0.1
(C) 02
(D) 0.4
Answer: Option A
11. Heavy duty leaf and coil springs contain carbon of the following order
(A) 0.2 %
(B) 0.5 %
(C) 0.8 %
(D) 1.0 %
Answer: Option D
12. The silicon steel is widely used for
(A) Connecting rods
(B) Cutting tools
(C) Generators and transformers in the form of laminated cores
(D) Motor car crankshafts
Answer: Option C
13. Blast furnace produces following by reduction of iron ore
(A) Cast iron
(B) Pig iron
(C) Wrought iron
(D) Malleable iron
Answer: Option B
14. For a steel containing 0.8% carbon
(A) There is no critical point
(B) There is only one critical point
(C) There are two critical points
(D) There can be any number of critical points
Answer: Option B
15. Nickel in steel
(A) Improves wear resistance, cutting ability and toughness
(B) Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties (C) Improves cutting ability and reduces hardenability
(D) Gives ductility, toughness, tensile strength and anticorrosion properties
Answer: Option D
16. Which of the following impurity in cast iron makes it hard and brittle?
(A) Silicon
(B) Sulphur
(C) Manganese
(D) Phosphorus
Answer: Option B
17. Tensile strength of steel can be safely increased by
(A) Adding carbon up to 2.8%
(B) Adding carbon up to 6.3%
(C) Adding carbon up to 0.83%
(D) Adding small quantities of copper
Answer: Option C
18. Which of the following metal is used for nuclear energy?
(A) Uranium
(B) Thorium
(C) Niobium
(D) All of these
Answer: Option D
19. Cemented carbide tools are not found to be suitable for cutting
(A) Brass
(B) Cast iron
(C) Aluminium
(D) Steel
Answer: Option D
20. Y-alloy contains
(A) 3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
(B) 3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium
(C) 4 to 4.5% magnesium, 3 to 4% copper and rest aluminium
(D) 5 to 6% tin, 2 to 3% copper and rest aluminium
Answer: Option B
21. Amorphous material is one
(A) In which atoms align themselves in a geometric pattern upon solidification
(B) In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid
(C) Which is not attacked by phosphorous
(D) Which emits fumes on melting
Answer: Option B
22. According to Indian standard specifications, SG 400/15 means
(A) Spheroidal graphite cast iron with B.H.N. 400 and minimum tensile strength 15 MPa
(B) Spheroidal graphite cast iron with minimum tensile strength 400 MPa and 15 percent elongation
(C) Spheroidal graphite cast iron with minimum compressive strength 400 MPa and 15 percent reduction in area
(D) None of the above
Answer: Option B
23. Brass (alloy of copper and zinc) is an example of
(A) Substitutional solid solution
(B) Interstitial solid solution
(C) Intermetallic compounds
(D) All of the above
Answer: Option A
24. In process annealing, the hypo eutectoid steel is
(A) Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air
(B) Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
(C) Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace
(D) Heated below or closes to the lower critical temperature and then cooled slowly
Answer: Option D
25. Pick up the wrong statement
(A) Aluminium in steel results in excessive grain growth
(B) Manganese in steel induces hardness
(C) Nickel and chromium in steel helps in raising the elastic limit and improve the resilience and ductility
(D) Tungsten in steels improves magnetic properties and hardenability
Answer: Option A