**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**

- Design stress/working stress
- Ultimate stress / allowable stress
- Yield stress/allowable stress
- None

**(Ans:c)**

**In a brittle material, factor of safety is**

- Design stress/working stress
- Ultimate stress / allowable stress
- Yield stress/allowable stress
- None

**(Ans:b)**

**Ductile material factor of safety is based on **

- Maximum Principal Stress Theory
- Maximum Shear Stress Theory
- Maximum Principal Strain Theory
- None

**(Ans:b)**

** Brittle material f****actor of safety is based on **

- Maximum Principal Stress Theory
- Maximum Shear Stress Theory
- Maximum Shear Strain Energy Theory
- 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**

- Design stress/working stress
- Ultimate stress / allowable stress
- Yield stress/allowable stress
- None

**(Ans:b)**