# Practice Test: Question Set - 12

**1. A circular shaft fixed at,**

*A*has diameter*D*for half of its length and diameter*D*/2 over the other half, as shown in the below figure. If the rotation of*B*relative to*A*is 0.1 radian, the rotation of*C*relative to*B*will be- (A) 0.4 radian

- (B) 0.8 radian

- (C) 1.6 radian

- (D) 3.2 radian

**2. The shear force diagram of a cantilever beam of length ‘**

*l’*and carrying a uniformly distributed load of*w*per unit length will be- (A) A right
angled triangle

- (B) An
isosceles triangle

- (C) An
equilateral triangle

- (D) A rectangle

**3. The safe twisting moment for a compound shaft is equal to the**

- (A) Maximum calculated
value

- (B) Minimum calculated
value

- (C) Mean value

- (D) Extreme value

**4. When a bar is subjected to a change of temperature and its deformation is prevented, the stress induced in the bar is**

- (A) Tensile
stress

- (B) Compressive
stress

- (C) Shear
stress

- (D) Thermal
stress

**5. A thin mild steel wire is loaded by adding loads in equal increments till it breaks. The extensions noted with increasing loads will behave as under**

- (A) Uniform throughout

- (B) Increase uniformly

- (C) First increase and
then decrease

- (D) Increase
uniformly first and then increase rapidly

**6. Which of the following is a proper sequence?**

- (A) Proportional
limit, elastic limit, yielding, failure

- (B) Elastic
limit, proportional limit, yielding, failure

- (C) Yielding,
proportional limit, elastic limit, failure

- (D) None
of the above

**7. Which is the false statement about true stress strain method?**

- (A) It does not exist

- (B) It is more sensitive to changes in both
metallurgical and mechanical conditions

- (C) It gives a more accurate picture of the
ductility

- (D) It can be correlated with stress strain
values in other tests like torsion, impact, combined stress tests etc.

**8. The bending equation is**

- (A)

*M/I = σ/y = E/R*

- (B)

*T/J = τ/R = Cθ/l*

- (C)

*M/R = T/J = Cθ/l*

- (D)

*T/l= τ/J = R/Cθ*

**9. For which material the Poisson's ratio is more than unity**

- (A) Steel

- (B) Copper

- (C) Aluminium

- (D) None of the above

**10. When a body is subjected to a direct tensile stress (σ) in one plane, then maximum normal stress occurs at a section inclined at _________ to the normal of the section.**

- (A) 0°

- (B) 30°

- (C) 45°

- (D) 90°

**11. Flow stress corresponds to**

- (A) Fluids in motion

- (B) Breaking point

- (C) Plastic deformation of solids

- (D) Rupture stress

**12. The thickness of a thin cylindrical shell with hemispherical ends is _________ that of spherical ends.**

- (A) Equal to

- (B) More than

- (C) Less than

- (D) None of
these

**13. A riveted joint in which every rivet of a row is opposite to other rivet of the outer row, is known as**

- (A) Chain riveted joint

- (B) Diamond riveted joint

- (C) Crisscross riveted joint

- (D) Zigzag riveted joint

**14. The maximum tangential stress in a thick cylindrical shell is always _________ the internal pressure acting on the shell.**

- (A) Equal to

- (B) Less than

- (C) Greater than

- (D) None of
these

**15. If percentage reduction in area of a certain specimen made of material '**

*A*' under tensile test is 60% and the percentage reduction in area of a specimen with same dimensions made of material '*B*' is 40%, then- (A) The
material

*A*is more ductile than material

*B*

- (B) The material

*B*is more ductile than material

*A*

- (C) The
ductility of material

*A*and

*B*is equal

- (D) The material

*A*is brittle and material

*B*is ductile

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