Engineering Materials objective questions with answers part5

Q1. A cold chisel is made of
(A) mild steel
(B) cast iron
(C) high carbon
(D) german silver

Q2. Steel contains
(A) 80% or more iron
(B) 50% or more iron
(C) alloying elements like chromium, tungsten nickel and copper
(D) high quantities of manganese.

Q3. Carbon steel is
(A) made by adding carbon in steel
(B) an alloy of iron and carbon with varying quantities of phosphorus and sulphur
(C) extensively used for making cutting tools
(D) extremely brittle

Q4. Annealing of white cast iron results in production of
(A) malleable iron
(B) nodular iron
(C) spheroidal iron
(D) grey iron

Q5. Hardness of steel depends on
(A) amount of carbon it contains
(B) the shape and distribution of the car-bides in iron
(C) method of fabrication
(D) contents of alloying elements

Q6. Maximum percentage of carbon in ferrite is
(A) 0.00025
(B) 0.03%
(C) 0.0015
(D) 0.0025

Q7. Maximum percentage of carbon in austenite is
(A) 0.00025
(B) 0.0026
(C) 0.0145
(D) 1.7%.

Q8. Corrosion resistance of steel is increased by addition of
(A) chromium and nickel
(B) sulphur, phosphorus, lead
(C) vanadium, aluminium
(D) tungsten, molybdenum, vanadium, chromium

Q9. In which of the following cases, consideration of creep is important
(A) flywheel of steam engine
(B) cast iron pipes”
(C) cycle chains
(D) gas turbine blades

Q10. The most effective inhibitor of grain growth, when added in small quantities is
(A) carbon
(B) vanadium
(C) manganese
(D) cobalt

Q11. Depth of hardness of steel is increased by addition of
(A) nickel
(B) chromium
(C) tungsten
(D) vanadium

Q12. Railway rails are normally made of
(A) mild steel
(B) alloy steel
(C) high carbon
(D) cast iron steel.

Q13. Select the incorrect statement
(A) aluminium in steel results in excessive grain growth
(B) manganese in steel induces hardness
(C) nickel and chromium in steel help in raising the elastic limit and improve the resilience and ductility
(D) tungsten in steels improves magnetic properties and hardenability

Q14. Select the incorrect statement Nickel and chromium in steel help in
(A) providing corrosion resistance
(B) improving machining properties
(C) providing high strength at elevated temperatures
(D) improving the resilience and ductility.

Q15. Machining properties of steel are improved by adding
(A) sulphur, lead, phosphorous
(B) silicon, aluminium, titanium
(C) vanadium, aluminium
(D) chromium, nickel

Q16. Eutectoid steel contains following percentage of carbon
(A) 0.0002
(B) 0.0053
(C) 0.80%
(D) 1.2%.

Q17. The basic constituents of Hastelloy are
(A) aluminium, copper etc.
(B) nickel, molybdenum etc.
(C) nickel, copper, etc.
(D) all of the above

Q18. Basic constituents of Monel metal are
(A) nickel, copper
(B) nickel, molybdenum
(C) zinc, tin, lead
(D) nickel, lead and tin

Q19. German silver is an alloy of
(A) silver and some impurities
(B) refined silver
(C) nickel, copper and zinc
(D) nickel and copper

Q20. Surveying tapes are made of a material having low coefficient of expansion and enough strength. The alloy used is
(A) silver metal
(B) duralumin
(C) monel metal
(D) invar