Fundamental of Machine Design Top 10 mcq.

01. Ductile cast iron is

A:  Also called nodular cast iron

B:  Also called spheroidal graphite cast iron

C:  Carbon is present in the form of spherical nodules

D:  All of the mentioned

And D.


02. The term high alloy steels are used for alloy steels containing more than ___ of alloying elements.

A:  10%

B:  20%

C:  50%

D:  70%

Ans A.


03. Which of the following are true about low carbon steels?

A:  Carbon content < 0.3%

B:  Also called as mild steel

C:  Are soft and ductile

D:  All of the mentioned 


And D.


04. Which of the following steel given in options respond fastest and easy to heat treatment?

A:  7C4

B:  10C4

C:  30C8

D:  40C8


Ans D.



Explanation: Alloys with higher carbon % respond willingly to heat treatment.


05. Annealing involves heating the component to a temperature

A:  Slightly above the critical temperature

B:  Equal to critical temperature

C:  Slightly less than the critical temperature

D:  None of the mentioned

Ans A.


06. Induction hardening process involves

A:  Heating surface by induction in field of invariable current

B:  Case depth minimum of 2mm is produced

C:  Heating surface by induction in the field of alternating current

D:  None of the mentioned


Ans C.

Explanation: 

Heating can only be done in the presence of alternating current and not constant current.


07. Which of the following contain copper

A:  bronze

B:  gunmetal

C:  monel metal

D:  each of the mentioned

And D.

08. 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 a poor thermal conductivity

Ans B.


Explanation: 

Brass is a good thermal conductor, is cheaper and has poor machinability.


09.As the amount of zinc increases

A:  strength of brass increases and ductility decrease

B: the strength of brass increases and ductility increase

C: the strength of brass decreases and ductility increases

D:  strength of brass decreases and ductility decreases

Ans A.

Explanation: Brass contains zinc and copper. Zinc affects strength with a direct increase in strength with an increase of zinc content.


10. Gunmetal is an alloy of copper which __ % tin and __% zinc.

A:  10,2

B:  2,10

C:  4,5

D:  5,4

Ans A.

Explanation: Zinc is used to improve fluidity during casting and hence is kept lesser than tin.