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মেকানিক্যাল ইঞ্জিনিয়ারিং

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3491. MCQPractice set · Question 43

Elastic after-effect কী?

a.
load সরানোর পর সম্পূর্ণ recovery-তে সময় লাগা
b.
instant fracture
c.
permanent density
d.
surface tension

Correct answer: a

কিছু material load removal-এর পর ধীরে ধীরে original shape ফিরে পায়।

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3492. MCQPractice set · Question 44

Elastic hysteresis কী?

a.
loading-unloading curve-এর energy loss
b.
zero strain
c.
surface wetting
d.
mass increase

Correct answer: a

Loading ও unloading path আলাদা হলে area energy dissipation নির্দেশ করে।

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3493. MCQPractice set · Question 45

Hysteresis loss সাধারণত কোন রূপে যায়?

a.
heat
b.
mass
c.
volume
d.
charge

Correct answer: a

Internal friction-এর কারণে hysteresis energy thermal energy হয়।

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3494. MCQPractice set · Question 46

Necking কী?

a.
tensile specimen-এর local cross-section কমে যাওয়া
b.
uniform expansion
c.
compression only
d.
shear zero

Correct answer: a

Ultimate stress-এর পর ductile specimen-এ localized neck তৈরি হতে পারে।

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3495. MCQPractice set · Question 47

Necking সাধারণত কোন material-এ বেশি দেখা যায়?

a.
ductile material
b.
perfectly brittle material
c.
glass only
d.
fluid

Correct answer: a

Ductile material plastic flow-এর কারণে necking দেখায়।

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3496. MCQPractice set · Question 48

Engineering stress কোন area ব্যবহার করে?

a.
original cross-sectional area
b.
final area only
c.
surface area only
d.
volume

Correct answer: a

Engineering stress applied load/original area।

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3497. MCQPractice set · Question 49

True stress কোন area ব্যবহার করে?

a.
instantaneous area
b.
original area only
c.
volume only
d.
length only

Correct answer: a

True stress current instantaneous area দিয়ে load ভাগ করে।

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3498. MCQPractice set · Question 50

Engineering strain কোন length ব্যবহার করে?

a.
original length
b.
final length only
c.
area
d.
volume

Correct answer: a

Engineering strain change in length/original length।

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3499. MCQPractice set · Question 51

Percentage elongation কী নির্দেশ করে?

a.
ductility
b.
density
c.
viscosity
d.
pressure

Correct answer: a

Fracture-এর পর elongation material-এর ductility বোঝায়।

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3500. MCQPractice set · Question 52

Percentage reduction in area কী নির্দেশ করে?

a.
ductility
b.
hardness only
c.
density
d.
surface tension

Correct answer: a

Fracture-এর আগে area reduction ductility-এর indicator।

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