Questions and answers for exam Preparation

MCQs

Total Questions : 98 | Page 6 of 10 pages

Question 51. A composite rod is 1000mm long, its two ends are 40 mm² and 30mm² in area and length are 400mm and 600mm respectively. If the rod is subjected to an axial tensile load of 1000N, what will be its total elongation(E = 200GPa)?

0.130m
0.197mm
0.160mm
0.150mm

Discuss Question

Answer: Option A. -> 0.130m
Answer: (a).0.130m

Question 52. A composite rod is 1000mm long, its two ends are 40mm² and 30mm² in area and length are 300mm and 200mm respectively. The middle portion of the rod is 20mm² in area. If the rod is subjected to an axial tensile load of 1000N, what will be its total elongation (E = 200GPa)?

0.145mm
0.127mm
0.187mm
0.196mm

Discuss Question

Answer: Option D. -> 0.196mm
Answer: (d).0.196mm

Question 53. A rod of two sections of area 625mm² and 2500mm² of length 120cm and 60cm respectively. If the load applied is 45kN then what will be the elongation (E = 2.1x 10⁵ N/mm²)?

0.462mm
0.521mm
0.365mm
0.514mm

Discuss Question

Answer: Option A. -> 0.462mm
Answer: (a).0.462mm

Question 54. What will be the elongation of a bar of 1250mm² area and 90cm length when applied a force of 130kN if E = 1.05x 10⁵ N/mm²?

0.947mm
0.891mm
0.845mm
0.745mm

Discuss Question

Answer: Option B. -> 0.891mm
Answer: (b).0.891mm

Question 55. A rod, which tapers uniformly from 5cm diameter to 3cm diameter in a length of 50cm, is subjected to an axial load of 6000N. if E = 2,00,000 N/mm², what will be the extension of the rod?

0.00114cm
0.00124cm
0.00127cm
0.00154cm

Discuss Question

Answer: Option C. -> 0.00127cm
Answer: (c).0.00127cm

Question 56. A solid uniform metal bar is hanging vertically from its upper end. Its elongation will be _________

Proportional to L and inversely proportional to D²
Proportional to L² and inversely proportional to D
Proportional of U but independent of D
Proportional of L but independent of D

Discuss Question

Answer: Option A. -> Proportional to L and inversely proportional to D²
Answer: (a).Proportional to L and inversely proportional to D²

Question 57. A member ABCD is subjected to points load P₁=45kN, P₂, P₃=450kN and P₄=130kN. What will be the total elongation of the member, assuming the modulus of elasticity to be 2.1x10⁵N/mm². The cross sectional area is 625mm, 2500mm, 1250mm respectively.

0.4914mm
0.4235mm
0.4621mm
0.4354mm

Discuss Question

Answer: Option A. -> 0.4914mm
Answer: (a).0.4914mm

Question 58. 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?

1.25mm
2.70mm
5.40mm
4.05mm

Discuss Question

Answer: Option A. -> 1.25mm
Answer: (a).1.25mm

Question 59. A steel rod 10mm in diameter and 1m long is heated from 20 to 100 degree celcius, E = 200 GPa and coefficient of thermal expansion is 12 x10⁻⁶ per degree celcius. Calculate the thermal stress developed?

192 MPa(tensile)
212 MPa(tensile)
192 MPa(compressive)
212 MPa(compressive)

Discuss Question

Answer: Option C. -> 192 MPa(compressive)
Answer: (c).192 MPa(compressive)

Question 60. A cube with a side length of 1m is heated uniformly a degree celcius above the room temperature and all the sides are free to expand. What will be the increase in the volume of the cube? Consider the coefficient of thermal expansion as unity.