Formability MCQs : Here you will find MCQ Questions related to "Formability" in Mechanical Behaviour & Testing of Materials. These Formability MCQ Questions Will help you to improve your Mechanical Behaviour & Testing of Materials knowledge and will prepare you for various Examinations like Competitive Exams, Placements, Interviews and other Entrance Exmaniations
_____________ is the ability of a given metal workpiece to undergo plastic deformation without being damaged
A. Fatigue Strength
D. Creep Strength
Explanation: Formability is the ability of a given metal workpiece to undergo plastic deformation without being damaged.
Processes affected by the formability of a material include?
D. All of the above
Explanation: Processes affected by the formability of a material include: rolling, extrusion, forging, rollforming, stamping, and hydroforming.
______________________ is a specific material property indicating the ratio between width deformation and thickness deformation in the uniaxial tensile test.
A. lankford coefficient
B. deep coefficient
C. punch coefficient
D. strain coefficient
Explanation: The lankford coefficient (r) is a specific material property indicating the ratio between width deformation and thickness deformation in the uniaxial tensile test.
Formability in sheet metal is characterized using forming limit curves
C. Can be true or false
D. Can not say
Explanation: True, formability in sheet metal is characterized using forming limit curves which describe the failure limit for various ratios of principal strain paths encountered during a forming operation from equibiaxial tension/stretch forming, plain strain, uniaxial strain, to pure shear/deep drawing scenarios
A metal with a large elongation has __________ formability
C. depends on metal
D. None of the above
Explanation: A metal with a large elongation has good formability because the metal is able to undergo a large amount of strain (work) hardening.
Which instrument is used to measure formability?
A. Universal testing machine
B. Impact testing machine
C. Erichsen machine
D. Fatigue testing machine
Explanation: Erichsen machine is used to measure formability of sheet metal. UTM is used to measure strength. Fatigue testing machine is used to measure fatigue strength and impact testing machine to measure impact strength.
What is the reason of orange-peel effect?
B. Fine grain structure
D. Coarse grain structure
Explanation: Grain size greatly affects deep drawing. Coarse grain size gives the rough surface appearance. It is known as orange-peel effect.
______ increases the formability of the metal sheet.
A. Cold working
C. Grain coarsening
Explanation: Annealing causes recrystallization in sheet metal reducing stresses. It hence improves formability. Cold working and inclusions decrease formability.
The formability of a particular metal depends on the metal’s elongation
C. Can be yes or no
D. Can not say
Explanation: Yes, From the metallurgical perspective, the formability of a particular metal depends on the metal’s elongation, which is the total amount of strain measured during tensile testing.
What is the value of lankford coefficient (r) for good deep drawable material?
Explanation: Lankford coefficient is a specific material property. It is the ratio of width deformation to thickness deformation in a uniaxial tensile test. It should be equal to or below 2 for good deep drawability.