# Practice Test: Question Set - 03

**1. The cross-section of lever is subjected to**

- (A) Torsional
moment

- (B) Axial
tensile force

- (C) Bending
moment

- (D) Axial
compressive force

**2. For maximum shear stress theory, the shape of the region of safety on σ**

_{1}, σ_{2}co-ordinate system is- (A) Square

- (B) Hexagon

- (C) Ellipse

- (D) Circle

**3. When a circular shaft is subjected to torque, the torsional shear stress is**

- (A) Directly
proportional to the distance from the axis

- (B) Inversely
proportional to the distance from the axis

- (C) Proportional
to the square of the distance from the axis

- (D) Constant
throughout the cross-section

**4. The factor of safety for carbon steel component, subjected to static force, is usually**

- (A) 1.5 to 2

- (B) 3 to 5

- (C) 1.3 to 1.5

- (D) 5 to 10

**5. The pin in knuckle joint is subjected to**

- (A) Double
shear stress

- (B) Torsional
shear stress

- (C) Axial
tensile stress

- (D) Axial
compressive stress

**6. The Poisson’s ratio of grey cast iron is**

- (A) 0.40

- (B) 0.29

- (C) 0.21

- (D) 0.75

**7. Griffiths’ law states that fracture strength of brittle material is**

- (A) Directly
proportional to the square root of the crack length

- (B) Inversely
proportional to the square root of the crack length

- (C) Directly
proportional to the square of the crack length

- (D) Inversely
proportional to the square of the crack length

**8. Rankine’s theory of failure is applicable to**

- (A) Ductile
materials

- (B) Elastic
materials

- (C) Brittle
materials

- (D) Plastic
materials

**9. The rocker arm in internal combustion engine is**

- (A) First
type of lever

- (B) Second
type of lever

- (C) Third
type of lever

- (D) None
of the above

**10. In lever terminology, ‘leverage’ is the ratio of**

- (A) Load
to effort

- (B) Effort
to load

- (C) Load
arm to effort arm

- (D) Effort arm
to load arm

**11. The torque transmitting capacity of a shaft of diameter d and made of material having (**

*t*) as permissible shear stress is,- (A)

*π*d

^{3}

*τ*

- (B) (

*π*/16) d

^{3}

*τ*

- (C) (

*π*/32) d

^{3}

*τ*

- (D) (

*π*/16) d

^{4}

*τ*

**12. In ‘first’ type of levers, mechanical advantage is**

- (A) Less than
one

- (B) More than
one

- (C) Equal to one

- (D) Any one of
the above

**13. According to maximum shear stress theory of failure, the relationship between yield strength in shear (**

*S*_{sy}) and tensile yield strength (*S*_{yt}) is- (A)

*S*

_{sy}= 0.5

*S*

_{yt}

- (B)

*S*

_{sy}= 0.577

*S*

_{yt}

- (C)

*S*

_{sy}= 0.75

*S*

_{yt}

- (D)

*S*

_{sy}= 0.4

*S*

_{yt}

**14. The Poisson’s ratio of carbon steels is**

- (A) 0.40

- (B) 0.29

- (C) 0.21

- (D) 0.75

**15. The thermal stresses are caused due to**

- (A) Variation
in temperature

- (B) High
temperatures

- (C) Specific
heat

- (D) Latent heat

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