A steel bar of 20mm x 20mm square cross-section is subjected to an axial compressive load of 100kN. If the length of the bar is 1m and E=200GPa, then what will be the elongation of the bar?

A steel bar of 40mm x 40mm square cross-section is subjected to an axial compressive load of 200kN. If the length of the bar is 2m and E=200GPa, the elongation of the bar well be ____________

A

1.25mm

B

2.70mm

C

4.05mm

D

5.40mm

A composite bar having two sections of cross-sectional area 100mm2 and 200mm2 respectively. The length of both the sections is 100mm. What will be the total elongation of bar if it is subjected to axial force of 100kN and E = 105 N/mm2?

A

1.0

B

1.25

C

1.5

D

2.0

When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor and W = Axial compressive load on the spring)

A

$$\frac{{{\text{WD}}}}{{\pi {{\text{d}}^3}}} \times {\text{K}}$$

B

$$\frac{{2{\text{WD}}}}{{\pi {{\text{d}}^3}}} \times {\text{K}}$$

C

$$\frac{{4{\text{WD}}}}{{\pi {{\text{d}}^3}}} \times {\text{K}}$$

D

$$\frac{{8{\text{WD}}}}{{\pi {{\text{d}}^3}}} \times {\text{K}}$$

A round bar made of same material consists of 4 parts each of 100mm length having diameters of 40mm, 50mm, 60mm and 70mm, respectively. If the bar is subjected to an axial load of 10kN, what will be the total elongation of the bar in mm?

A

0.4/πE ( 1/16 + 1/25 + 1/36 + 1/49)

B

4/πE ( 1/16 + 1/25 + 1/36 + 1/49)

C

2/πE ( 1/16 + 1/25 + 1/36 + 1/49)

D

40/πE ( 1/16 + 1/25 + 1/36 + 1/49)

A bar having two sections of cross sectional area of 100mm2 and 200mm2 respectively. The length of both the sections is 200mm. What will be the total strain in the bar if it is subjected to axial force of 100kN and E = 105 N/mm2?

A

0.010

B

0.015

C

0.020

D

0.030

A steel rod is 2m long and 50mm in diameter. An axial pull of 100kN is suddenly applied to the rod. What will be the instantaneous elongation produced in the rod if E=22GN/m2?

A

0.0097 mm

B

1.0754 mm

C

1.6354 mm

D

1.0186 mm

A compound bar consists of two bars of equal length. Steel bar cross-section is 3500 mm² and that of brass bar is 3000 mm². These are subjected to a compressive load 1,00,000 N. If E_b = 0.2 MN/mm² and E_b = 0.1 MN/mm², the stresses developed are:

A

$${\sigma _{\text{b}}}$$ = 10 N/mm², $${\sigma _{\text{s}}}$$ = 20 N/mm²

B

$${\sigma _{\text{b}}}$$ = 8 N/mm², $${\sigma _{\text{s}}}$$ = 16 N/mm²

C

$${\sigma _{\text{b}}}$$ = 6 N/mm², $${\sigma _{\text{s}}}$$ = 12 N/mm²

D

$${\sigma _{\text{b}}}$$ = 5 N/mm², $${\sigma _{\text{s}}}$$ = 10 N/mm²

A brass bar, having cross sectional area of 100mm2, is subjected to axial force of 50kN. The length of two sections is 100mm and 200mm respectively. What will be the total elongation of bar if E = 1.05 x 105 N/mm2 ?

A

1.21mm

B

2.034mm

C

2.31mm

D

1.428mm

An axial residual compressive stress due to a manufacturing process is present on the outer surface of a rotating shaft subjected to bending. Under a given bending load, the fatigue of the shaft in the presence of the residual compressive stress is ____________

A

Decreased

B

Increases or decreased, depending on the external bending load

C

Neither decreased nor increased

D

Increases

A steel bar 2 m long, 20 mm wide and 10 mm thick is subjected to a pull of 2 kN. If the same bar is subjected to a push of 2 kN, the Poisson’s ratio of the bar in tension will be __________ the Poisson's ratio for the bar in compression.

A

Equal to

B

Less than

C

Greater than

D

None of these

A steel bar of 20mm x 20mm square cross-section is subjected to an axial compressive load of 100kN. If the length of the bar is 1m and E=200GPa, then what will be the elongation of the bar?

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