Questions and answers for exam Preparation

MCQs

Total Questions : 53 | Page 5 of 6 pages

Question 41. The maximum instantaneous extension, produced by an unknown falling weight in a vertical bar of length 3m. What will be the instantaneous stress induced in the vertical bar and the value of unknown weight if E = 200GPa?

100 N/mm²
110 N/mm²
120 N/mm²
140 N/mm²

Discuss Question

Answer: Option D. -> 140 N/mm²
Answer: (d).140 N/mm²

Question 42. An unknown weight falls through a height of 10mm on a collar rigidly attached to a lower end of a vertical bar 500cm long. If E =200GPa what will be the value of stress?

50 N/mm²
60 N/mm²
70 N/mm²
80 N/mm²

Discuss Question

Answer: Option D. -> 80 N/mm²
Answer: (d).80 N/mm²

Question 43. The maximum instantaneous extension, produced by an unknown falling weight through a height of 4cm in a vertical bar of length 3m and of cross section area 5cm². What will be the instantaneous stress induced in the vertical bar and the value of unknown weight if E = 200GPa?

1700 N
1459.4 N
1745.8 N
1947.5 N

Discuss Question

Answer: Option C. -> 1745.8 N
Answer: (c).1745.8 N

Question 44. A 1m long bar of uniform section extends 1mm under limiting axial stress of 200N/mm². What is the modulus of resilience for the bar?

0.1 units
1 units
10units
100units

Discuss Question

Answer: Option A. -> 0.1 units
Answer: (a).0.1 units

Question 45. A square steel bar of 10mm side and 5m length is subjected to a load whereupon it absorbs a strain energy of 100J. what is its modulus of resilience?

1/5 N-mm/mm³
25 N-mm/mm³
1/25 N-mm/mm³
5 N-mm/mm³

Discuss Question

Answer: Option A. -> 1/5 N-mm/mm³
Answer: (a).1/5 N-mm/mm³

Question 46. What is the strain energy stored in a body when the load is applied suddenly?

σE/V
σE²/V
σV²/E
σV²/2E

Discuss Question

Answer: Option D. -> σV²/2E
Answer: (d).σV²/2E

Question 47. A tensile load of 60kN is suddenly applied to a circular bar of 4cm diameter. What will be the maximum instantaneous stress induced?

95.493 N/mm²
45.25 N/mm²
85.64 N/mm²
102.45 N/mm²

Discuss Question

Answer: Option A. -> 95.493 N/mm²
Answer: (a).95.493 N/mm²

Question 48. What is the relation between maximum stress induced due to sudden loading to maximum stress the gradual loading?

Maximum stress in sudden load is equal to the maximum stress in gradual load
Maximum stress in sudden load is half to the maximum stress in gradual load
Maximum stress in sudden load is twice to the maximum stress in gradual load
Maximum stress in sudden load is four times to the maximum stress in gradual load

Discuss Question

Answer: Option C. -> Maximum stress in sudden load is twice to the maximum stress in gradual load
Answer: (c).Maximum stress in sudden load is twice to the maximum stress in gradual load

Question 49. A uniform bar has a cross sectional area of 700mm and a length of 1.5m. if the stress at the elastic limit is 160 N/mm, what will be the value of gradually applied load which will produce the same extension as that produced by the suddenly applied load above?