M5

Question 1

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

Answer 1

B

Question 2

Distortion Energy Theory is also known
as ________ Theory.
A. Coulomb-Mohr C. Maximum Shear Stress
B. Maximum Normal Stress D. Von Mises

Answer 2

D

Question 3

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

Answer 3

A

Question 4

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

Answer 4

C

Question 5

) 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

Answer 5

D

Question 6

Under which type of loading does
fatigue occur?
A. Repeated load C. Plane load
B. High load D. Static load

Answer 6

A

Question 7

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

Answer 7

C

Question 8

) Fillet is used in gears to:
A. Increase load factor
B. Increase tangential force
C. Reduce concentration factor
D. Reduce tensile strength

Answer 8

C

Question 9

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

Answer 9

B

Question 10

The number of cycles required to cause failure
for given stream level.
A. Endurance C. Fatigue life
B. Fatigue D. Rupture

Answer 10

C

Question 11

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

Answer 11

D

Question 12

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

Answer 12

D

Question 13

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

Answer 13

C

Question 14

What percentage of engineering failures are
fatigue failures?
A. 60 C. 80
B. 70 D. 90

Answer 14

C

Question 15

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

Answer 15

C

Question 16

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

Answer 16

C

Question 17

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

Answer 17

A

Question 18

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

Answer 18

B

Question 19

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

Answer 19

D

Question 20

Which of the following is another name of radius gauge?
A. Ring gauge C. Planer gauge
B. Fillet gauge D. Plug gauge

Answer 20

B

Question 21

Which of the following is not suitable for impact loads?
A. Cast iron C. HSS steel
B. Chrome steel D. Mild steel

Answer 21

A

Question 22

Which of the following is not suitable for impact loads?
A. Cast iron C. HSS steel
B. Chrome steel D. Mild steel

Answer 22

C

Question 23

The phenomenon of decreased resistance of the materials
to fluctuating stresses is the main characteristic of:
A. Fatigue C. Impact
B. Fracture D. Yielding

Answer 23

A

Question 24

It is the total strain energy stored in a body.
A. Impact energy C. Proof resilience
B. Modulus of resilience D. Resilience

Answer 24

D

Question 25

Under steady or _______ loading, a machine part made of ductile material fails by yielding. A. Pulsating C. Reversed B. Repeated D. Static

Answer 25

D

Question 26

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�

Answer 26

A

Question 27

Which of the following property is desirable in parts subjected to shock and impact loads? A. Brittleness C. Strength B. Stiffness D. Toughness

Answer 27

D

Question 28

The theory of failure was first proposed by _______. A. Coulomb C. Mohr B. Von Mises D. St. Venant

Answer 28

A

Question 29

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

Answer 29

C

Question 30

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

Answer 30

D

Question 31

By default, for any corner, the radius of fillet is: _____. A. 0 C. 1/8″ B. 1/16″ D. 3 mm

Answer 31

A

Question 32

The stress represented by cos 𝑡 belongs to which category? A. Fluctuating Stresses C. Alternating Stresses B. Repeated Stresses D. Reversed Stresses

Answer 32

D

Question 33

The stress represented by (1 + sin 𝑡) belongs to which category? A. Fluctuating Stresses C. Alternating stresses B. Repeated Stresses D. Reversed stress

Answer 33

B

Question 34

The curve found by plotting the normal and shear stresses. A. Coulomb’s envelope C. Strength envelope B. Mohr's envelope D. Stress envelope

Answer 34

C

Question 35

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

Answer 35

A

Question 36

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

Answer 36

A

Question 37

Which one of the following is the most conservative fatigue failure criterion? A. Soderberg C. Modified Goodman B. ASME Elliptic D. Gerber

Answer 37

A

Question 38

The fatigue life of a part can be improved by this. A. Heat treatment C. Hot working B. Shot peening D. Electroplating

Answer 38

B

Question 39

Guest’s theory of failure is applicable for following type of materials: A. Brittle C. Elastic B. Ductile D. Plastic

Answer 39

B

Question 40

A metallic material that does not show a fatigue limit. A. Aluminum C. Stainless steel B. High Strength Steel D. Titanium alloys

Answer 40

A

Question 41

A hot short metal is ______. A. Brittle when cold C. Hard when hot B. Brittle when hot D. None of the above

Answer 41

B

Question 42

The edges of boiler plates for fullering and caulking are beveled at an angle of: A. 60° C. 80° B. 70° D. 90°

Answer 42

C

Question 43

Fatigue failures occur on stresses _________. A. Above fracture strength C. Below elastic limit B. Above tensile strength D. Below tensile strength

Answer 43

C

Question 44

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

Answer 44

A

Question 45

Resilience of a material is important, when it is subjected to: A. Combined load C. Shock load B. Fatigue load D. Wear load

Answer 45

C

Question 46

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

Answer 46

A

Question 47

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

Answer 47

D