⚙️Mechanical Engineering MCQs
Mechanical Engineering MCQs
488 MCQs1
Wrought iron is________________?
Ahard
Bhigh in strength
Chighly resistant to corrosion
Dheat treated to change its properties E. least resistant to corrosion
2
Pick up wrong statement about wrought iron ?
AIt contains carbon of the order of 0 to 0.25%
BIt melts at 1535°C
CIt is very soft and ductile
DIt can be easily forge welded E. It is made by adding suitable percent¬age of carbon to molten iron and subjecting the product to repeated hammering and rolling
3
Gamma iron exits at following temperature___________________?
Aroom temperature
Bnear melting point
Cbetween 1400°C and 1539°C
Dbetween 910°C and 1400°C E. none of the above
4
Pure iron is the structure of_______________?
Aferrite
Bpearlite
Canstenite
Dferrite and cementite E. ferrite and pearlite
5
Cast iron is characterised by minimum of following %age of carbon_________________?
A0.2%
B0.8%
C1.3%
D2% E. 6.3%.
6
The molecules in a solid move______________?
Ain a random manner
Bin a haphazard way
Cin circular motion
Dback and forth like tiny pendulums E. do not move
7
Paramagnetic alpha iron changes to gamma iron at_______________?
A770°C
B910°C
C1440°C
D1539°C E. none of the above
8
The crystal structure of gamma iron is_________________?
Abody centred cubic
Bface centred cubic
Chexagonal close packed
Dcubic structure E. orthorhombic crystal
9
The metallic structure of mild steel is_________________?
Abody centred cubic
Bface centred cubic
Chexagonal close packed
Dcubic structure E. orthorhombic crystal
10
The percentage of carbon in pig iron varies from___________________?
A0.1 to 1.2%
B1.5 to 2.5%
C2.5 to 4%
D4 to 4.5% E. 4.5 to 6.3%.