ME Subjects – Concepts Simplified

MCQ: FACTOR OF SAFETY

Which is the factor of safety under gradually applied load?
(a) 2 and 4
(b) 4 and 8
(c) 8 and 16
(d) None
(Ans: a)

What is the factor of safety under suddenly applied load? 
(a) 2 and 4
(b) 4 and 8
(c) 8 and 16
(d) None
(Ans: b)

 Factor of safety under impact load is 
(a) 2 and 4
(b) 4 and 8
(c) 8 and 16
(d) None
(Ans: c)

Safety factor  in case of a ductile material is 
(a) Real stress/unit stress
(b) Ultimate stress/maximum stress
(c) Yield stress/ allowable stress
(d) None
(Ans: c)

  In case of a brittle material,  the factor of safety is
(a) Real stress/unit stress
(b) Ultimate stress/allowable stress
(c) Allowable stress/ Yield stress
(d) None
(Ans: b)
What is accounted for by the factor of safety?
(a) Uncertainties
(b) Linear displacements
(c) Parabolic displacements
(d) None
(Ans: a)

 Other common name of the factor of safety is
(a) Strength
(b)Strain
(c)Ignorance
(d) None
(Ans: c)

Under exact analysis of stresses, what will be value of factor of safety  in a body?
(a) More
(b) Less
(c) Zero
(d) None
(Ans: c)
Effect of higher factor of safety on cost of the material? 
(a) Increases
(b) Decreases
(c) No change
(d) None
(Ans: a)

 Elastic theory of failure under which the factor of safety is based for a brittle material?

(a) Maximum principal stress theory

(b) Maximum shear stress theory

(c) Von Mises theory

(d) None

(Ans:d)

  Theory of elastic failure accounts for factor of safety for a brittle material?

(a) Maximum principal stress theory

(b) Maximum shear stress theory

(c) Maximum principal strain theory

(d) None

(Ans:b)

 The factor of safety for a ductile material 

(a)  σ_yp/σ_allow

(b) σ_ult/σ_allow

(c) σ_ult/σ_yp

_{(d) None}

Ans:(a)

Factor of safety in a ductile material is

1. Design stress/working stress
2. Ultimate stress / allowable stress
3. Yield stress/allowable stress
4. None

(Ans:c)

In a brittle material, factor of safety is

1. Design stress/working stress
2. Ultimate stress / allowable stress
3. Yield stress/allowable stress
4. None

(Ans:b)

Ductile material factor of safety is based on

1. Maximum Principal Stress Theory
2. Maximum Shear Stress Theory
3. Maximum Principal Strain Theory
4. None

(Ans:b)

 Brittle material factor of safety is based on

1. Maximum Principal Stress Theory
2. Maximum Shear Stress Theory
3. Maximum Shear Strain Energy Theory
4. None

(Ans:a)

Large value of factor of safety is

(a) Very good

(b) Good

(c) Bad

(d) None

(Ans: c)

Safety factor  in a brittle material is

1. Design stress/working stress
2. Ultimate stress / allowable stress
3. Yield stress/allowable stress
4. None

(Ans:b)