M5 Flashcards
Which of the following is the ratio of the
fatigue strength without a stress concentration to the
fatigue stress with a stress concentration?
A. Factor of safety
B. Fatigue stress concentration factor
C. Reliability factor
D. Wahl’s factor
B
Distortion Energy Theory is also known
as ________ Theory.
A. Coulomb-Mohr C. Maximum Shear Stress
B. Maximum Normal Stress D. Von Mises
D
The surface hardening is desirable for
a product that is subject to:
A. Fatigue C. High impact loads
B. High shear load D. High tensile load
A
Which of the following occurs whenever
there is a discontinuity or non-uniformity in an object?
A. Stress concentration factor
B. Extreme shear stress
C. Geometric stress concentration
D. Fatigue Stress concentration
C
) Fillet radius in machine parts is usually
introduced to:
A. Avoid obstruction
B. Improve the look of the parts
C. Necessary lessen casting weights
D. Reduce the concentration of stress and extend the life
of the parts
D
Under which type of loading does
fatigue occur?
A. Repeated load C. Plane load
B. High load D. Static load
A
Peening is a cold working process in steel
materials that tends to _______ its properties.
A. Make it more ductile C. Harden
B. Make it more malleable D. Oxidize
C
) Fillet is used in gears to:
A. Increase load factor
B. Increase tangential force
C. Reduce concentration factor
D. Reduce tensile strength
C
A final operation to improve the polish of a
metal and to bring out the maximum luster.
A. Broaching C. Finishing
B. Buffing D. Surface grinding
B
The number of cycles required to cause failure
for given stream level.
A. Endurance C. Fatigue life
B. Fatigue D. Rupture
C
This is a shaper operation, which is shaping
the given stock and having the excess material remain with
a tolerable allowance for finishing.
A. Angular cutting C. Finishing
B. Contouring D. Roughing
D
This is a theory in cyclic and impact loading,
which states that damage at any stress level, is proportional
to number of cycles
.A. Basquin’s equation C. Coffin-Manson formula
B. Goodman relation D. Miner’s rule
D
What is the other term for the MaximumShear-Stress Theory, as a failure prediction theory?
A. Coulomb-Mohr theory C. Tresca yield criterion
B. Modified Mohr theory D. Von Mises criterion
C
What percentage of engineering failures are
fatigue failures?
A. 60 C. 80
B. 70 D. 90
C
The internal stresses that exist in any part of
the temperature and not acted upon an external load.
A. Control stresses C. Residual stresses
B. Form stresses D. Superposed stresses
C
What is the other term for the maximumShear stress Theory (MSST) as a failure prediction Theory?
A. Coulomb-Mohr Theory C. Tresca-Yield Criterion
B. Modified Mohr Theory D. Von Mises Criterion
C
Von Mises theory is the other term used for:
A. Energy distortion theory
B. Maximum principal stress theory
C. Maximum shear-stress theory
D. Octahedral shear-stress theory
A
A part subjected to any combination of loads will fail (by
yielding or fracturing) whenever the maximum shear stress
exceeds a critical value.
A. Distortion-Energy Theory C. Modified Mohr Theory
B. Max. Shear Stress Theory D. Principal Stress Theory
B
It is a measure of the ease with which a crack progresses
through a material from an existing notch, crack, or sharp
corner.
A. Brittleness C. Mohs Scale
B. Creep Rate D. Notch sensitivity
D
Which of the following is another name of radius gauge?
A. Ring gauge C. Planer gauge
B. Fillet gauge D. Plug gauge
B
Which of the following is not suitable for impact loads?
A. Cast iron C. HSS steel
B. Chrome steel D. Mild steel
A
Which of the following is not suitable for impact loads?
A. Cast iron C. HSS steel
B. Chrome steel D. Mild steel
C
The phenomenon of decreased resistance of the materials
to fluctuating stresses is the main characteristic of:
A. Fatigue C. Impact
B. Fracture D. Yielding
A
It is the total strain energy stored in a body.
A. Impact energy C. Proof resilience
B. Modulus of resilience D. Resilience
D
Under steady or _______ loading, a machine part made of
ductile material fails by yielding.
A. Pulsating C. Reversed
B. Repeated D. Static
D
According to principal stress theory, which option
represents the correct relation between yield strength in
shear and the yield strength in tension?
A. 𝑆𝑦𝑠 = 0.5𝑆𝑡𝑠 C. 𝑆𝑦𝑠 = 0.577𝑆𝑡𝑠
B. 𝑆𝑡𝑠 = 0.5𝑆𝑦𝑠 D. 𝑆𝑡𝑠 = 0.577𝑆𝑦�
A
Which of the following property is desirable in parts
subjected to shock and impact loads?
A. Brittleness C. Strength
B. Stiffness D. Toughness
D
The theory of failure was first proposed by _______.
A. Coulomb C. Mohr
B. Von Mises D. St. Venant
A
The Von Mises and Tresca criteria give different yield stress
for ________.
A. Uni-axial stress C. Pure shear stress
B. Balanced bi-axial stress D. All of these
C
If the mean stress value for a sinusoidal stress function is
zero, then this type of stress falls in which category?
A. Fluctuating Stresses C. Alternating Stresses
B. Repeated Stresses D. Reversed Stresses
D
By default, for any corner, the radius of fillet is: _____.
A. 0 C. 1/8″
B. 1/16″ D. 3 mm
A
The stress represented by cos 𝑡 belongs to which category?
A. Fluctuating Stresses C. Alternating Stresses
B. Repeated Stresses D. Reversed Stresses
D
The stress represented by (1 + sin 𝑡) belongs to which
category?
A. Fluctuating Stresses C. Alternating stresses
B. Repeated Stresses D. Reversed stress
B
The curve found by plotting the normal and shear stresses.
A. Coulomb’s envelope C. Strength envelope
B. Mohr’s envelope D. Stress envelope
C
The stress represented by (1.5+ sin 𝑡) belongs to which
category?
A. Fluctuating Stresses C. Repeated Stresses
B. Reversed Stresses D. None of these
A
The stress represented by (cos 𝑡 + π/2) belongs to which
category?
A. Alternating Stresses C. Reversed Stresses
B. Reversed Stresses D. None of these
A
Which one of the following is the most conservative fatigue
failure criterion?
A. Soderberg C. Modified Goodman
B. ASME Elliptic D. Gerber
A
The fatigue life of a part can be improved by this.
A. Heat treatment C. Hot working
B. Shot peening D. Electroplating
B
Guest’s theory of failure is applicable for following type of
materials:
A. Brittle C. Elastic
B. Ductile D. Plastic
B
A metallic material that does not show a fatigue limit.
A. Aluminum C. Stainless steel
B. High Strength Steel D. Titanium alloys
A
A hot short metal is ______.
A. Brittle when cold C. Hard when hot
B. Brittle when hot D. None of the above
B
The edges of boiler plates for fullering and caulking are
beveled at an angle of:
A. 60° C. 80°
B. 70° D. 90°
C
Fatigue failures occur on stresses _________.
A. Above fracture strength C. Below elastic limit
B. Above tensile strength D. Below tensile strength
C
Impact load results from which type of effects of loads
applied?
A. Dynamic C. Both A and B
B. Static D. Neither A nor B
A
Resilience of a material is important, when it is subjected to:
A. Combined load C. Shock load
B. Fatigue load D. Wear load
C
The critical shear stress causing failure of material depends
upon the _______.
A. Material’s properties and normal stress on the plane
B. Intermediate principal stress
C. Both A and B
D. Neither A nor B
A
The property of a material which enables it to resist fracture
due to high impact loads is also known as:
A. Elasticity C. endurance
B. Strength D. toughness
D
