This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on “Copper Alloys & Die Casting Alloys”.
1. Which of the following are true for copper alloys
a) Posses excellent thermal and electrical conductivity
b) Can be easily cast and machined
c) Has good corrosion resistance
d) All of the mentioned
View Answer
Explanation: Properties of copper.
2. Which of the following contain copper
a) bronze
b) gunmetal
c) monel metal
d) each of the mentioned
View Answer
Explanation: All the mentioned alloys contain copper to some extent.
3. Which of the following are true
a) Brass is costlier then copper
b) Brass has excellent corrosion resistance
c) Brass has good machinability
d) Brass has poor thermal conductivity
View Answer
Explanation: Brass is a good thermal conductor,is cheaper and has poor machinability.
4. As the amount of zinc increases
a) strength of brass increases and ductility decrease
b) strength of brass increases and ductility increase
c) strength of brass decreases and ductility increases
d) strength of brass decreases and ductility decreases
View Answer
Explanation: Brass contains zinc and copper. Zinc affects strength with direct increase in strength with increase of zinc content.
5. Which of the following are true for aluminium bronze
a) contain 5-10% aluminium
b) excellent corrosion and is also called imitation gold
c) difficult to cast
d) all of the mentioned
View Answer
Explanation: Color of aluminium bronze is similar to gold. Other two are the properties of alloys.
6. Which of the following statements for phosphorus bronze is true?
a) contains 0.2% phosphorus
b) phosphorus increases tensile strength
c) use for worm wheels and bearings
d) all of the mentioned
View Answer
Explanation: It has good tensile strength, corrosion resistance and is used for bearings.
7. Gunnmetal is an alloy of copper which __ % tin and __% zinc.
a) 10,2
b) 2,10
c) 4,5
d) 5,4
View Answer
Explanation: Zinc is used to improve fluidity during casting and hence is kept lesser than tin.
8. Monel metal is a copper nickel alloy of __% nickel and __%copper.
a) 32,65
b) 65,32
c) 20,80
d) 80,20
View Answer
Explanation: Composition.
9. Which of the following are true for die casting alloys?
a) this process consists of forcing the molten metal into a closed metal die
b) process used for a metal with low melting point
c) surface finish is excellent
d) all of the mentioned
View Answer
Explanation: Characteristics of die casting alloys.
Sanfoundry Global Education & Learning Series – Machine Design.
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