# Practice Test: Question Set - 31

**1. A closely coiled helical spring is of mean diameter (**

*D*) and spring wire diameter (*d*). The spring index is the ratio of- (A) 1/

*d*

- (B) 1/

*D*

- (C)

*D*/

*d*

- (D)

*d*/

*D*

**2. The compression test is carried on __________ materials.**

- (A) Ductile

- (B) Brittle

- (C) Malleable

- (D) Plastic

**3. If the tearing efficiency of a riveted joint is 50%, then ratio of rivet hole diameter to the pitch of rivets is**

- (A) 0.20

- (B) 0.30

- (C) 0.50

- (D) 0.60

**4. The breaking stress is __________ the ultimate stress.**

- (A) Equal to

- (B) Less than

- (C) Greater than

- (D) None of
these

**5. The section modulus (**

*Z*) of a beam is given by- (A)

*I*/

*y*

- (B)

*I*.

*y*

- (C)

*y*/

*I*

- (D)

*M*/

*I*

**6. The Rankine's formula holds good for**

- (A) Short
columns

- (B) Long columns

- (C) Both
short and long columns

- (D) Weak
columns

**7. When two main plates are kept in alignment butting each other and riveted with cover plate on both sides of the main plates with two rows of rivets in each main plate, the joint is known as ________ double cover butt joint.**

- (A) Single
riveted

- (B) Double
riveted

- (C) Multi
riveted

- (D) None
of these

**8. When a shaft is subjected to a twisting moment, every cross-section of the shaft will be under**

- (A) Tensile
stress

- (B) Compressive
stress

- (C) Shear
stress

- (D) Bending
stress

**9. The maximum bending moment of a simply supported beam of span**

*l*and carrying a point load*W*at the center of beam, is- (A)

*Wl*/4

- (B)

*Wl*/2

- (C)

*Wl*

- (D)

*Wl²*/4

**10. A tensile test is performed on a mild steel round bar. Its diameter after fracture will**

- (A) Remain same

- (B) Increase

- (C) Decrease

- (D) Depend upon
rate of loading

**11. Transverse fillet welds are designed for**

- (A) Tensile
strength

- (B) Compressive
strength

- (C) Shear
strength

- (D) Bending
strength

**12. The product of the tangential force acting on the shaft and its distance from the axis of the shaft (i.e. radius of shaft) is known as**

- (A) Bending
moment

- (B) Twisting
moment

- (C) Torsional
rigidity

- (D) Flexural
rigidity

**13. The unit of strain is**

- (A) N-mm

- (B) N/mm

- (C) mm

- (D) No unit

**14. In spring balances, the spring is used**

- (A) To apply
forces

- (B) To measure
forces

- (C) To absorb
shocks

- (D) To store
strain energy

**15. A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum shear stress will be**

- (A) 400 MPa

- (B) 500 MPa

- (C) 900 MPa

- (D) 1400 MPa

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