ا ةدا ي ة يلمع ي فHardness إت ي
ث نتدلا ص ةدا ي دار ملا ند عملا نيخ ست إ
ن يلق د عبو ًاو هلا ي ف در بيل رتي ظ حلا
ي تمت دق ندعملل يدراخلا حئسلا نأ ةدا
ب لقلا ةدلا ص ن م ر ثكأ نتدلا صCore
اهيم سن ا م ي ه ندعملا يف ةيصاخلا زذهو
ا بHardenability صتلل ن تيلباق نأ دل
دلا ص ةدا ي ت مت نذ لا قمعلا ب ساقتو نت
ب لقلل بو صو حئ سلا ن مCore ا ملكو
ر ثكأ ند عملا ناكHardenability ا ملك
درا خلا حئ سلا ةدلا ص ني ب را فلا ق ي
بلقلا ةدلاصوCore
Thehardenabilityof ametalalloyis the depth to which a material is
hardened after putting it through aheat-treatmentprocess. It should not
be confused withhardness, which is a measure of a sample's resistance to
indentation or scratching.It is an important property forwelding, since it is
inversely proportional toweldability, that is, the ease of welding a material
• ادد ةضفخنم ةرارح ةدردل ةلصوملا ةداملا وصو دنع(ةرارحلاةدرحلا ) ب ئ باور نو كتت ني
ربو ك او و ب ام ست تا نورتكللااCooperPair( ر يبكلا يئا ي يفلل ةب سنCooper س سؤم
ا ة يرظنBCSداو ملا إ لع ي ف ةريه شلا ) إ علا ة ميق س فن ا مهل تا نورتكللاا ن م و و هو
قئا فلا ي صوتلا ةرها ظ ثود ح ًارو بب سلا و ه اذ هو ة سكاعتم تا هادتا ي ف نكلو نارودلاو
Superconductivity نل ةيبرهك ةمواقم نودب رايتلا رورموSmoothlyاقباس انركذ امك
MCQs –Question [1]
1) It is the property of material which opposes the
deformation or breakdown of material in presence of
external forces or load Material.
a) Strength
b) Toughness
c) Hardness
d) Hardenability
e) Brittleness
Ans: a
MCQs –Question [2]
2) The material must have suitable mechanical …….. to
be capable to work under different mechanical forces
or loads.
a) Strength
b) Resultant force
c) weld ability
d) Hardenability
e) Brittleness
Ans: a
MCQs –Question [3]
3) ………. is the ability of material to absorb the energy
and gets plastically deformed without breaking.
a) Strength
b) Toughness
c) Hardness
d) Hardenability
e) Brittleness
Ans: b
MCQs –Question [4]
4) ………. numerical value is determined by the amount
of energy per unit volume. Its unit is Joule/ m 3
a) Strength
b) Toughness
c) Hardness
d) Hardenability
e) Brittleness
Ans: b
MCQs –Question [5]
5) For good ………….., material should have good
strength as well as ductility
a) Strength
b) Toughness
c) Hardness
d) Hardenability
e) Brittleness
Ans: b
MCQs –Question [6]
6) For good toughness, material should have good
……….. as well as ………
a) Strength and brittleness
b) Ductility and brittleness
c) Hardness and brittleness
d) Hardenability and strength
e) Strength and ductility
Ans: e
MCQs –Question [7]
7) To be tough, material should be capable to
withstand with high stress but with no strain occurring
a) True
b) False
Ans: b
MCQs –Question [8]
8) ……….. is the ability of material to resist to
permanent shape change due to external stress.
a) Strength
b) Toughness
c) Hardness
d) Hardenability
e) Brittleness
Ans: C
MCQs –Question [9]
9) various measures of hardness include
a) Scratch Hardness
b) Indentation Hardness
c) Rebound Hardness
d) All of the above
e) None of them
Ans: d
MCQs –Question [10]
10) ……… is the ability of material to oppose the
scratch to outer surface layer due to external force
a) Scratch Hardness
b) Indentation Hardness
c) Rebound Hardness
d) A and C
e) None of them
Ans: a
MCQs –Question [11]
11) ……… is ability of material to oppose the dent
due to punch of external had and sharp object
a) Scratch Hardness
b) Indentation Hardness
c) Rebound Hardness
d) A and B
e) None of them
Ans: b
MCQs –Question [12]
12) ……… It is determined by the height of bounce of a
diamond tipped hammer dropped from a fixed height
on the material
a) Scratch Hardness
b) Dynamic Hardness
c) Rebound Hardness
d) B and C
e) None of them
Ans: d
MCQs –Question [13]
13) ……… is the ability of a material to attain the hardness by
………….. processing It is determined by the depth up to
which the material becomes hard.
a) Strength , heat treatment
b) Toughness ,Cooling treatment
c) Ductility , air treatment
d) Hardenability, heat treatment
e) Hardenability, cold air treatment
Ans: d
MCQs –Question [14]
14) ……… of material is inversely proportional to ………… of
material
a) Hardenability, Hardness
b) Hardenability, Strength
c) Hardenability, weld ability
d) B and C
e) Hardenability has no relation to any other material property
Ans: C
MCQs –Question [15]
15) The SI unit of hardenability is ……….. (similar to ……..)
a) ??????, Length
b) ??????
2
, Area
c) ??????
3
, Volume
d) ??????/??????
2
, Stress
e) None
Ans: a
MCQs –Question [16]
16) ……….. indicates that how easily it gets fractured
when it is subjected to a force or load.
a) Strength
b) Toughness
c) Hardness
d) Hardenability
e) Brittleness
Ans: e
MCQs –Question [17]
17) When a brittle material is subjected to a stress it
observes high energy and gets fractures with high
strain and shape plastic deformation
a) True
b) False
Ans: b
MCQs –Question [18]
18) When a ………. material is subjected to a stress is
observes very less energy and gets fractures without
significant strain
a) brittle
b) tough
c) ductile
d) strong
e) None
Ans: a
MCQs –Question [19]
19) Brittleness of material is temperature depended.
Some metals which are ductile at normal temperature
become brittle at low temperature
a) True
b) False
Ans: a
MCQs –Question [20]
20) ductility of material is converse to brittleness of
material
a) True
b) False
Ans: a
MCQs –Question [21]
21) ………… material is a material that achieves
superconductivity, which means that it has no electrical
resistance and does not allow magnetic fields to penetrate.
a) Insulator
b) NormalConductor
c) Superconductor
d) Semiconductor
e) Ferromagnetic
Ans: C
MCQs –Question [22]
22) Superconductivity can only typically be achieved at very
high temperatures.
a) True
b) False
Ans: b
MCQs –Question [23]
23) Which of the following is considered to be
superconducting materials ?
a) Aluminum at very low temperature
b) Magnesium Diboride
c) Yttrium Barium Copper Oxide
d) Iron Pnictides
e) All of The Previous
Ans: e
MCQs –Question [24]
24) As temperature ……………, a superconducting
material's resistance gradually ………….. until it reaches
critical temperature At this point resistance drops off
a) decreases, increases
b) increases, increases
c) increases, decreases
d) decreases, decreases
e) There is no relation
Ans: d
MCQs –Question [25]
25) When the temperature of the metal decreases below the
critical temperature, the electrons in the metal form bonds
known as …………
a) Cooper pairs
b) Mutual pairs
c) Maher pairs
d) Critical temperature pairs
e) None of the above
Ans: a
MCQs –Question [26]
26) The AAAC Conductor contains a small percentage of
……….
a) silicon and magnesium
b) Carbon and manganese
c) silicon and manganese
d) Carbon and magnesium
e) None of the above
Ans: a
Final
Question
MCQs –Question [27]
27) The best type of transmission line conductors used for
long spans between towers with higher possible conductivity
is ……….
a) AAC
b) AAAC
c) ACSR
d) AACSR
e) None
Ans: C
Final
Question
MCQs –Question [28]
Ans: 2
Midterm
Question
MCQs –Question [29]
29) The mechanical property which permits an electrical material to
oppose the deformation in presence of external load is termed as
………..
a) Strength
b) Toughness
c) Hardness
d) Hardenability
e) Brittleness
Ans: a
Midterm Question
MCQs –Question [30]
30) Resistance developed by surface of any electrical
material is known as ………..
a) Strength
b) Toughness
c) Hardness
d) Hardenability
e) Brittleness
Ans: C
Midterm Question
MCQs –Question [31]
31) Skin effect has highest impact in the following type of
conductor
a) AAAC
b) ACSR
c) AAC
d) None
Ans: b
Midterm Question
MCQs –Question [32]
32) If the target is to get a conductor that with good
conditions of termination and lower lines losses, the best
type is …….
a) AAAC
b) ACSR
c)AACSR
d) None
Ans: a
Midterm Question
MCQs –Question [33]
33) If the target is to get a conductor that can be used for
any rough mechanical circumstances, the best type is …….
a) AAAC
b)AAC
c) AACSR
d) None
Ans: C
MCQs –Question [34]
34) AAAC is less liable to damage during installation which is
an important advantage of EHV transmission lines where
corona and radio interference is a major consideration.
a) True
b)False
Ans: a
MCQs –Question [35]
35) If the target is to get a conductor that has a high
resistance to atmospheric corrosion which is suitable for
coastal and industrial areas, the best type will be ……….
a) AAAC
b)AAC
c) ACSR
d) None
Ans: a