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Engineering materials
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ Free carbon in iron makes the metal. soft and gives a coarse grained crystalline structure [other wrong options] [Discuss in forum] soft and gives a fine grained crystalline structure hard and gives a coarse grained crystalline structure hard and gives a fine grained crystalline structure |
Q22 ⇒ According to Indian standard specifications, SG 400/15 means. spheroidal graphite cast iron with minimum tensile strength 400 MPa and 15 percent elongation [other wrong options] [Discuss in forum] spheroidal graphite cast iron with B.H.N. 400 and minimum tensile strength 15 MPa spheroidal graphite cast iron with minimum compressive strength 400 MPa and 15 percent reduction in area none of the above |
Q23 ⇒ Admiralty brass used for steam condenser tubes contains copper and zinc in the following ratio 30 : 70 [other wrong options] [Discuss in forum] 50 : 50 70 : 30 40 : 60 60 : 40. |
Q24 ⇒ Which of the following statements are true for annealing of steels? all of these [other wrong options] [Discuss in forum] Steels are heated to 500 to 700° C Cooling is done slowly and steadily Internal stresses are relieved |
Q25 ⇒ The bond formed by transferring electrons from one atom to another is called. ionic bond [other wrong options] [Discuss in forum] covalent bond metallic bond none of these |
Q26 ⇒ Corrosion resistance of steel is increased by adding chromium and nickel [other wrong options] [Discuss in forum] nickel and molybdenum aluminium and zinc tungsten and sulphur none of the above. |
Q27 ⇒ The hardness is the property of a material due to which it. can cut another metal [other wrong options] [Discuss in forum] can be drawn into wires breaks with little permanent distortion can be rolled or hammered into thin sheets |
Q28 ⇒ The material widely used for making pendulums of clocks is. nickel steel [other wrong options] [Discuss in forum] stainless steel high speed steel heat resisting steel |
Q29 ⇒ The alloying element which reduces the formation of iron sulphide in steel is. manganese [other wrong options] [Discuss in forum] chromium nickel vanadium |
Q30 ⇒ Corrundum contains more than 95% A1203 [other wrong options] [Discuss in forum] steel Si02 MgO german silver. |
Q31 ⇒ An alloy steel which is work hardenable and which is used to make the blades of bulldozers, bucket wheel excavators and other earth moving equipment contain iron, carbon and. manganese [other wrong options] [Discuss in forum] chromium silicon magnesium |
Q32 ⇒ Which of the following is an amorphous material? Glass [other wrong options] [Discuss in forum] Mica Silver Lead |
Q33 ⇒ Which of the following property is desirable for materials used in tools and machines? Elasticity [other wrong options] [Discuss in forum] Plasticity Ductility Malleability |
Q34 ⇒ Alnico, an alloy used extensively for per-manent magnets contains iron, nickel, aluminium and cobalt in the following ratio 50 : 20 : 20 : 10 [other wrong options] [Discuss in forum] 40 : 30 : 20 : 10 50 : 20 : 10 : 20 30 : 20 : 30 : 20 50 : 10 : 20 : 20. |
Q35 ⇒ The unit cells. all of the above [other wrong options] [Discuss in forum] contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal have the same orientation and their similar faces are parallel may be defined as the smallest parallelopiped which could be transposed in three coordinate directions to build up the space lattice |
Q36 ⇒ Combined carbon in iron makes the metal. hard and gives a fine grained crystalline structure [other wrong options] [Discuss in forum] soft and gives coarse grained crystalline structure soft and gives a fine grained crystalline structure hard and gives a coarse grained crystalline structure |
Q37 ⇒ Eutectoid reaction occurs at. 723°C [other wrong options] [Discuss in forum] 600°C 1147°C 1493°C |
Q38 ⇒ If a refractory contains high content of silicon, it means refractory is neutral [other wrong options] [Discuss in forum] acidic basic brittle none of the above. |
Q39 ⇒ Iron-carbon alloys containing 1.7 to 4.3% carbon are known as. hypo-eutectic cast irons [other wrong options] [Discuss in forum] eutectic cast irons hyper-eutectic cast irons none of these |
Q40 ⇒ Which of the following is added in low carbon steels to prevent them from becoming porous? Silicon [other wrong options] [Discuss in forum] Sulphur Phosphorus Manganese |
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