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মেকানিক্যাল ইঞ্জিনিয়ারিং

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3591. MCQPractice set · Question 43

Working stress সাধারণত কেমন রাখা হয়?

a.
failure বা yield stress-এর চেয়ে কম
b.
failure stress-এর চেয়ে বেশি
c.
অসীম
d.
zero

Correct answer: a

Safety margin-এর জন্য allowable stress strength-এর নিচে রাখা হয়।

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3592. MCQPractice set · Question 44

Ductility কী?

a.
ভাঙার আগে plastic deformation-এর ক্ষমতা
b.
scratch resistance
c.
fluid flow
d.
volume stiffness

Correct answer: a

Ductile material fracture-এর আগে উল্লেখযোগ্য elongation দেখায়।

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3593. MCQPractice set · Question 45

Brittleness কী?

a.
সামান্য plastic deformation-এ fracture
b.
বেশি elongation
c.
high resilience
d.
fluidity

Correct answer: a

Brittle materials warning deformation কম দেখিয়ে ভেঙে যায়।

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3594. MCQPractice set · Question 46

Toughness কী?

a.
fracture-এর আগে energy absorb করার ক্ষমতা
b.
শুধু stiffness
c.
density
d.
surface tension

Correct answer: a

Toughness stress-strain curve-এর total area-এর সঙ্গে সম্পর্কিত।

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3595. MCQPractice set · Question 47

Resilience কী?

a.
elastic range-এ energy absorb করার ক্ষমতা
b.
plastic strain
c.
fracture stress
d.
viscosity

Correct answer: a

Resilience recoverable elastic energy storage বোঝায়।

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3596. MCQPractice set · Question 48

Creep কী?

a.
constant stress-এ time-এর সাথে deformation
b.
instant fracture
c.
elastic recovery
d.
density change

Correct answer: a

Creep sustained load-এ gradual time-dependent strain।

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3597. MCQPractice set · Question 49

Fatigue কী?

a.
cyclic loading-এ failure
b.
single static load only
c.
fluid flow
d.
surface wetting

Correct answer: a

Repeated stress-এর কারণে fatigue crack ও failure হতে পারে।

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3598. MCQPractice set · Question 50

Stress relaxation কী?

a.
constant strain-এ stress কমে যাওয়া
b.
constant stress-এ strain বাড়া
c.
density change
d.
surface tension

Correct answer: a

Fixed strain অবস্থায় time-এর সাথে stress কমাকে stress relaxation বলে।

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3599. MCQPractice set · Question 51

Strain energy কী?

a.
deformation-এর কারণে stored work
b.
mass energy
c.
fluid pressure
d.
surface color

Correct answer: a

Elastic deformation-এর জন্য external work strain energy হিসেবে জমে।

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3600. MCQPractice set · Question 52

Strain energy density-এর formula linear elastic material-এ কী?

a.
½ stress×strain
b.
stress/strain
c.
force×area
d.
mass/volume

Correct answer: a

Unit volume energy u=½σε।

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