Civil Engineering Exams (Principles of Structural Analysis and Design) – Page 3

#40. A steel I-beam is 14 ft long and 12 inches deep and has a moment of inertia about an axis perpendicular to the web at mid-depth of 215.8 in4. What is the maximum load that can fall on the center of the beam from a height of 8 inches without producing a stress greater than 30, 000 psi if 80% of the kinetic energy of the falling body is transformed into work deformation ? E = 30x106 psi.
A 754 lbs
B 574 lbs
C 475 lbs
D 745 lbs
Answer: 754 lbs
#41. A round boom 55 ft long is subjected to a centric axial end load of 22, 000 lbs compression when it is making an angle of 45o with the horizontal. The weight of timber is 34 lb/ft3. The allowable stress is \(1, 600 (1- \frac{L}{60d})\). What is the size of the boom? Neglect the effect of the lateral buckling.
A 11.06 inches
B 17.61 inches
C 13.82 inches
D 12.47 inches
Answer: 12.47 inches
#42. A reinforced concrete beam has a width of 380 mm, effective depth of 570 mm carries a uniform live load of 90 kN/m and a uniform dead load of 60 kN/m. The reinforcing steel strength Fy = 276 MPa and specified strength of concrete of fc' = 21 MPa. The beam has a span of 4.0 meters. Which of the following gives the factored uniform load in kN/m?
A 237
B 226
C 210
D 260
Answer: 237
#43. A reinforced concrete beam has a width of 380 mm, effective depth of 570 mm carries a uniform live load of 90 kN/m and a uniform dead load of 60 kN/m. The reinforcing steel strength Fy = 276 MPa and specified strength of concrete of fc' = 21 MPa. The beam has a span of 4.0 meters. Which of the following gives the shear at critical section in kN?
A 280
B 339
C 310
D 358
Answer: 339
#44. A reinforced concrete beam has a width of 380 mm, effective depth of 570 mm carries a uniform live load of 90 kN/m and a uniform dead load of 60 kN/m. The reinforcing steel strength Fy = 276 MPa and specified strength of concrete of fc' = 21 MPa. The beam has a span of 4.0 meters. Which of the following gives the nominal shear strength provided by the wen reinforcement in kN?
A 339
B 276
C 234
D 221
Answer: 234
#45. A flexible shaft consist of 0.20 in diameter steel wire encased in a stationary tube that fits closely enough to impose a frictional torque of 0.540 lb.in/in. Determine the maximum length of the shaft if the shearing stress is not to exceed 20 ksi.
A 49.98 in
B 58.62 in
C 75.12 in
D 62.83 in
Answer: 62.83 in
#46. A flexible shaft consist of 0.20 in diameter steel wire encased in a stationary tube that fits closely enough to impose a frictional torque of 0.540 lb.in/in. What twill be the angular deformation of one end relative to the other end? G = 12 x 106 psi.
A 20 degrees
B 30 degrees
C 40 degrees
D 45 degrees
Answer: 30 degrees
#47. A rock is thrown at a level ground with an angle of inclination of 22.78o and initial velocity of 54.23 m/s. How long will it take the rock to reach the ground?
A 4.38 s
B 2.48 s
C 4.28 s
D 3.18 s
Answer: 4.28 s
#48. A rock is thrown at a level ground with an angle of inclination of 22.78o and initial velocity of 54.23 m/s. How far would it reach horizontally?
A 201 m
B 214 m
C 243 m
D 114 m
Answer: 214 m
#49. A rock is thrown at a level ground with an angle of inclination of 22.78o and initial velocity of 54.23 m/s. How high would it reach as it reaches zero velocity?
A 22. 48 m
B 25. 22 m
C 23. 52 m
D 21. 66 m
Answer: 22. 48 m
#50. A rail road track is laid at a temperature of 10oC with gaps of 0.007 m between the ends of the rails. The rails are 20 m long. Coefficient of thermal expansion is 11.25 x 10-6C. Modulus of elasticity = 200 000 MPa. Which of the following gives the actual deformation of the rails that will result from a temperature of 65oC.
A 0.0124
B 0.00124
C 0.0214
D 0.00214
Answer: 0.0124
#51. A rail road track is laid at a temperature of 10oC with gaps of 0.007 m between the ends of the rails. The rails are 20 m long. Coefficient of thermal expansion is 11.25 x 10-6C. Modulus of elasticity = 200 000 MPa. Which of the following gives the corresponding strain due to this deformation?
A 0.00049
B 0.00022
C 0.00056
D 0.00037
Answer: 0.00022
#52. A rail road track is laid at a temperature of 10oC with gaps of 0.007 m between the ends of the rails. The rails are 20 m long. Coefficient of thermal expansion is 11.25 x 10-6C. Modulus of elasticity = 200 000 MPa. Which of the following gives the thermal stress if they are prevented from buckling?
A 40 MPa
B 44 MPa
C 36 MPa
D 52 MPa
Answer: 44 MPa
#53. A steel bar 50 mm in diameter and 2 m long is surrounded by a shell of cast iron 5 mm thick. Compute the load that will compress the combined bar a total of 0.8 mm in the length of 0.2 m. For steel, E = 200 GPa, and for cast iron, E = 100 GPa.
A 225 kN
B 196.25 kN
C 220 kN
D 192 kN
Answer: 192 kN
#54. A reinforced concrete column 200 mm in diameter is designed to carry an axial compressive load of 300 kN. Determine the required area of the reinforcing steel if the allowable stresses are 6 MPa and 120 MPa for the concrete and steel, respectively. Use Eco = 14 GPa and Est = 200 GPa.
A 2200 mm2
B 1200 mm2
C 1400 mm2
D 2400 mm2
Answer: 1400 mm2
#55. If a stone is dropped from a balloon while ascending at the rate of 25 ft per sec reaches the ground in 6 seconds, what was the height of the balloon when the stone was dropped?
A 426.9 ft
B 249.6 ft
C 429.6 ft
D 492.6 ft
Answer: 429.6 ft
#56. From a balloon rising with a velocity, V(mph) a body was let fall and struck the ground in T seconds. Find the height of the balloon at the instant the body was let fall.
A \(\frac{T}{2}(gT - 2V)\)
B \(T-\frac{V}{g}(\)
C \(\sqrt{2gh}\)
D \(Vt\)
Answer: \(\frac{T}{2}(gT - 2V)\)
#57. Assuming that a cannon ball was fired vertically upward from elevation 0 +00 above sea level with an initial velocity of 120 mph, what elevation will the cannon ball reach before returning to earth?
A 0+ 461 ft
B 0+ 481 ft
C 0+ 441 ft
D 0+ 411 ft
Answer: 0+ 481 ft
#58. Two vehicles, A and B travel on a level road in the same direction at 100 km per hour. b is 80 meters ahead of A when brakes are applied on B causing it to decelerate at the rate of 7 fps2. In what time will A overtake B and how far will each have traveled?
A B will travel 250.4 meters and A travels 150.6 meters
B A will travel 250.4 meters and B travels 150.6 meters
C A will travel 240.5 meters and B travels 160.5 meters
D B will travel 240.5 meters and A travels 160.5 meters
Answer: A will travel 240.5 meters and B travels 160.5 meters
#59. Cars A and B approached each other on a straight road from points 1, 500 ft apart. A has an initial velocity of 45 mph and is decelerating at the rate of 1.4 ft/s2. B has an initial velocity of 12 mph and is accelerating at a rate of 1 ft/s2. When will the car meet and how far will car A have traveled?
A A will travel 507 ft at that point they will meet
B A will travel 1500 ft at that point they will meet
C A will travel 990 ft at that point they will meet
D A will travel 993 ft at that point they will meet
Answer: A will travel 993 ft at that point they will meet