# Practice Test: Question Set - 29

**1. The polar moment of inertia of a hollow shaft of outer diameter (**

*D*) and inner diameter (*d*) is- (A) Ï€/16

*(D³ - d³)*

- (B) Ï€/16

*(D⁴ - d⁴)*

- (C) Ï€/32

*(D⁴ - d⁴)*

- (D) Ï€/64

*(D⁴ - d⁴)*

**2. The springs in brakes and clutches are used to**

- (A) To apply forces

- (B) To measure
forces

- (C) To store
strain energy

- (D) To absorb
shocks

**3. A beam encastered at both the ends is called**

- (A) Simply
supported beam

- (B) Fixed beam

- (C) Cantilever
beam

- (D) Continuous
beam

**4. A spring used to absorb shocks and vibrations is**

- (A) Conical
spring

- (B) Torsion
spring

- (C) Leaf spring

- (D) Disc spring

**5. The bending moment at the free end of a cantilever beam is**

- (A) Zero

- (B) Minimum

- (C) Maximum

- (D) None of
these

**6. The hoop stress in a thin cylindrical shell is**

- (A) Longitudinal
stress

- (B) Compressive
stress

- (C) Radial
stress

- (D) Circumferential
tensile stress

**7. In a stress-strain diagram as shown in the below figure, the curve ‘**

*A’*represents- (A) Mild steel

- (B) Soft brass

- (C) Low carbon
steel

- (D) Cold
rolled steel

**8. The ratio of bulk modulus to Young's modulus for a Poisson's ratio of 0.25 will be**

- (A) 1/3

- (B) 2/3

- (C) 1

- (D) 3/2

**9. The ratio of shear modulus to the modulus of elasticity for a Poisson's ratio of 0.4 will be**

- (A) 5/7

- (B) 7/5

- (C) 5/14

- (D) 14/5

**10. A column of length (**

*l*) with both ends fixed may be considered as equivalent to a column of length __________ with one end fixed and the other end free.- (A)

*l*/8

- (B)

*l*/4

- (C)

*l*/2

- (D)

*l*

**11. The pull required to shear off a rivet, in double shear, per pitch length is**

- (A)

*Ï€*/4 ×

*d²*×

*Ïƒ*

_{t}- (B)

*Ï€*/4 ×

*d²*×

*Ï„*

- (C)

*Ï€*/2 ×

*d²*×

*Ïƒ*

_{t}- (D)

*Ï€*/2 ×

*d²*×

*Ï„*

**12. The bending stress in abeam is __________ bending moment.**

- (A) Equal to

- (B) Less than

- (C) More than

- (D) Directly
proportional to

**13. When a change in length takes place, the strain is known as**

- (A) Linear
strain

- (B) Lateral
strain

- (C) Volumetric
strain

- (D) Shear strain

**14. The volumetric strain is the ratio of the**

- (A) Original
thickness to the change in thickness

- (B) Change in
thickness to the original thickness

- (C) Original
volume to the change in volume

- (D) Change in
volume to the original volume

**15. A welded joint as compared to a riveted joint has __________ strength.**

- (A) Same

- (B) Less

- (C) More

- (D) None of
these

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