@⇒ Engineering Materials ⇒ Mechanical Engineering Multiple Choice Questions / Objective type questions, MCQ's, with question and answers, download free PDF, short cut notes, rapid fire notes, best theory

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Q1.	Steel made from phosphatic iron is
A.	brittle [Correct Answer]
B.	hard [Wrong Answer]
C.	ductile [Wrong Answer]
D.	tough [Wrong Answer]
E.	malleable. [Wrong Answer]
View Answer 52 -25 Explanation:- Answer : A Discuss it below : Click here for more comments


Q2.	Grey cast iron has.
A.	carbon in the form of free graphite [Correct Answer]
B.	high tensile strength [Wrong Answer]
C.	low compressive strength [Wrong Answer]
D.	all of these [Wrong Answer]
View Answer 26 -10 Explanation:- Answer : A Discuss it below : Click here for more comments


Q3.	Ductile cast iron
A.	contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron [Wrong Answer]
B.	is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable [Wrong Answer]
C.	is produced by annealing process. It is soft, tough and easily machined metal [Wrong Answer]
D.	is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material [Correct Answer]
E.	none of the above. [Wrong Answer]
View Answer 13 -5 Explanation:- Answer : D Discuss it below : Click here for more comments


Q4.	The property of a material essential for spring materials is.
A.	stiffness [Wrong Answer]
B.	ductility [Wrong Answer]
C.	resilience [Correct Answer]
D.	plasticity [Wrong Answer]
View Answer 25 -17 Explanation:- Answer : C Discuss it below : Click here for more comments


Q5.	Brass contains
A.	70% copper and 30% zinc [Correct Answer]
B.	90% copper and 10% tin [Wrong Answer]
C.	85-92% copper and rest tin with little lead and nickel [Wrong Answer]
D.	70-75% copper and rest tin [Wrong Answer]
E.	70% copper and 30% tin. [Wrong Answer]
View Answer 21 -8 Explanation:- Answer : A Discuss it below : Senthil R Said on 2023-07-12 11:36:40 Bronze contains (a) 70% Cu and 30% Zn (b) 90% Cu and 10% Zn (c) 75% Cu and 25% Zn (d) None of the above Click here for more comments

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