# Practice Test: Question Set - 15

**1. The maximum strain energy that can be stored in a body is known as**

- (A) Impact energy

- (B) Resilience

- (C) Proof resilience

- (D) Modulus of resilience

**2. Two closely-coiled helical springs '**

*A*' and '*B*' of the same material, same number of turns and made from same wire are subjected to an axial load*W*. The mean diameter of spring '*A*' is double the mean diameter of spring '*B*'. The ratio of deflections in spring '*B*' to spring '*A*' will be- (A) 1/8

- (B) 1/4

- (C) 2

- (D) 4

**3. The force acting along the circumference will cause stress in the walls in a direction normal to the longitudinal axis of cylinder; This stress is called**

- (A) Longitudinal stress

- (B) Hoop stress

- (C) Yield stress

- (D) Ultimate stress

**4. The section modulus of a rectangular section about an axis through its C.G., is**

- (A)

*b*/2

- (B)

*d*/2

- (C)

*bd²*/2

- (D)

*bd²*/6

**5. The change in length due to a tensile or compressive force acting on a body is given by (where**

*P*= Tensile or compressive force acting on the body,*l*= Original length of the body,*A*= Cross-sectional area of the body, and*E*= Young's modulus for the material of the body)- (A)

*PlA/E*

- (B)

*Pl/AE*

- (C)

*E/PlA*

- (D)

*AE/Pl*

**6. In riveted boiler joints, all stresses, shearing, bearing and tensile are based on the**

- (A) Size of rivet

- (B) Size of the drilled or reamed hole

- (C) Average of size of rivet and hole

- (D) Smaller of the two

**7. In calculating the strength of a riveted joint in tearing, shearing and crushing, the**

- (A) Actual
diameter of rivet is used

- (B) Actual
diameter of hole drilled for rivet is used

- (C) Mean
diameter of hole drilled and rivet is used

- (D) Smaller
of the rivet diameter and hole diameter is used

**8. It equal and opposite forces applied to a body tend to elongate it, the stress so produced is called**

- (A) Internal resistance

- (B) Tensile stress

- (C) Transverse stress

- (D) Compressive stress

**9. The hoop stress in a riveted cylindrical shell of diameter (**

*d*), thickness (*t*) and subjected to an internal pressure (*p*) is (where*η*= Efficiency of the riveted joint)- (A)

*pd/η × t*

- (B)

*pd/η × 2t*

- (C)

*pd/η × 4t*

- (D)

*pd/η × 8t*

**10. A non yielding support implies that the**

- (A) Support is frictionless

- (B) Support can take any amount of reaction

- (C) Support holds member firmly

- (D) Slope of the beam at the support is zero

**11. Which of the following is the correct torsion equation?**

- (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*

**12. For steel, the ultimate strength in shear as compared to in tension is nearly**

- (A) Same

- (B) Half

- (C) One third

- (D) Two third

**13. The given figure shows the Mohr's circle of stress for two unequal and like principal stresses (**

*σ*and_{x}*σ*) acting at a body across two mutually perpendicular planes. The resultant stress is given by_{y}- (A)

*OC*

- (B)

*OP*

- (C)

*OQ*

- (D)

*PQ*

**14. A beam supported on more than two supports is called**

- (A) Simply
supported beam

- (B) Fixed beam

- (C) Overhanging
beam

- (D) Continuous
beam

**15. Rivets are made of following type of material**

- (A) Tough

- (B) Hard

- (C) Resilient

- (D) Ductile

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