Construction Planning and Management

51. Grader is used mainly for

1. Trimming and finishing
2. Shaping and trimming
3. Finishing and shaping
4. Finishing, shaping and trimming

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52. Henry Gantt developed Bar charts for planning and scheduling of projects in

1. 1880
2. 1900
3. 1920
4. 1940

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53. If a is the optimistic time, b is the pessimistic time and m is most likely time of an activity, the expected time of the activity, is

1. (a + m + b)/6
2. (a + 2m + b)/6
3. (a + 4m + b)/6
4. (a + 5m + b)/6

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54. If an activity has its optimistic, most likely and pessimistic times as 2, 3 and 7 respectively, then its expected time and variance are respectively

1. 3.5 and 5/6
2. 5 and 25/36
3. 3.5 and 25/36
4. 4 and 5/6

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55. If D is the duration, ES and EF are the earliest start and finish, LS and LF are latest start and latest finish time, then the following relation holds good

1. EF = ES + D
2. LS = LF - D
3. LF = LS + D
4. All the above

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56. If t is the duration of an activity, t1 is the latest finish possible moment of its preceding activity and t2 is the earliest start possible moment, the independent float of the activity is

1. (t₁ - t₂) - t
2. t - (t₁ - t₂)
3. (t₁ + t₂) - t
4. t + (t₁ - t₂)

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57. If t_o, t_p and t_m are the optimistic, pessimistic and most likely time estimates of an activity respectively, the expected time t of the activity will be

1. t_o + 3t_m+ t_p/3
2. t_o + 4t_m+ t_p/4
3. t_o + 4t_m+ t_p/5
4. t_o + 4t_m+ t_p/6

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58. If the excavation of earth is done manually then it costs Rs. 10 per cum. A machine can excavate at a fixed cost of Rs. 4000 plus a variable cost of Rs. 2 per cum. The quantity of earth for which the cost of excavation by machine will be equal to the cost of manual excavation is

1. 500 cum
2. 1000 cum
3. 1500 cum
4. 2000 cum

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59. If the expected time for completion of a project is 10 days with a standard deviation of 2 days, the expected time of completion of the project with 99.9% probability is

1. 4 days
2. 6 days
3. 10 days
4. 16 days

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60. If the expected time of completion of a project is 60 weeks with a standard deviation of 5 weeks, the probability of completing the project in 50 weeks and 65 weeks respectively will be

1. 2.3% and 84.1%
2. 97.7% and 84.1%
3. 97.7 % and 15.9%
4. 15.9% and 97.7%

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