SUPAUL COLLEGE OF ENGINEERING, SUPAUL
B.TECH 6th Semester Exam 2023
Model Question
Construction Engineering & Management (101602)
Time: 3 hours Full Marks: 70
Instructions:
(i) The marks are indicated in right-hand margin.
(ii) There are Nine questions in this paper.
(iii) Attempt Five questions in all.
(iv) Question No. 1 is compulsory.
1. Choose the correct answer of the following (any seven): 2x7=14
(a) A serious limitation of interdependencies between various activities is generally observed in
i) Bar chart ii) work breaks down structure
iii) network analysis iv) job layouts
(b) There are three parallel paths in a part of a network between a bursting node and the next merging node
with only one activity in each path. The minimum number of dummy arrows needed will be
i) zero ii) 1
iii) 2 iv) 3
(c) for a given activity, the optimistic time, pessimistic time and the most probable estimates are 5, 17 and 8
days respectively. The expected time is
i) 8 days ii) 9 days
iii) 10 days iv) 11 days
(d) The probability distribution taken to represent the completion time in PERT analysis is
i) gamma distribution ii) normal distribution
iii) beta distribution iv) log-normal distribution
(e) - distribution curve is divided into two equal halves by vertical ordinate through
i) expected time ii) optimistic time
iii) most likely time iv) pessimistic time
(f) Slack time in PERT analysis
i) is minimum for critical activites ii) can never be less than zero
iii) can never be greater than zero iv) is always zero for critical activity
(g) PERT calculation yields a project length of 60 weeks with a variance of 9 weeks. Probability factor
corresponding to 95% is 1.647; then the number of weeks required to complete the project with a probability
of 95% is
i) 60.94 ii) 62.94
iii) 64.94 iv) 66.9417
(h) Which one of the following project management technique is deterministic in nature?
i) CPM ii) PERT
iii) GERT iv) LCES
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(i) What is the duration by which the completion time of any activity can be delayed without affecting the start of
any of the succeeding activities?
i) Interfering float ii) Free float
iii) Independent float iv) Total float
j) Whenever an activity has zero total float, then
i) free float of the activity must be zero but independent float may not be zero
ii) independent float need not be zero
iii) free float and independent float both must be zero
iv) free float and independent float both need not be zero
2. What do you understand by term CPM and its significance? As per the given below network diagram, calculate the
following: 14
(a) Estimated duration of project
(b) Critical path
(c) EST, EFT, LST and LFT of each activities.
(d) Total floats of each activity.
E
t=5 6
2
A I
t=3 F t=6 t=1
B G
1 t=4 3 t=4
C D t=3 5
t=14 H t=1
3. (a) What is project management? Also, explain the elements of project management. 4
(b) Explain various methods of project scheduling. Also, draw a bar chart with the help of given information and calculate
the project duration.
Activity No. Duration
1 1
2 2
3 4
4 3
5 1
6 2
7 4
Activity 2 and activity 3 can be done concurrently and both must follow activity 1. Activity 2 must precede activity 4.
Activity 5 cannot begin until both activities 2 & 3 are completed. Activity 6 & 7can be started only after activities 4 & 5 are
complete. 10
4. (A) Define event and activity and also explain different type of activity with the help of a network diagram?
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(B) A small project consists of seven activities with the following details.
Activity DURATION, WEEKS Immediate
Most Optimistic Pessimistic Predecessor
likely
A 4 2 8
B 7 3 15 A
C 4 4 4 A
D 11 5 23 B, C
E 8 4 16 B
F 6 3 15 D, E
G 5 5 5 D
(i) Draw Network Diagram, find critical path, the expected completion time.
(ii) What project duration will have 95% confidence of completion? Take Z = 1.64. 10
5. Define direct cost, indirect cost and cost slope of a project and also explain Total Cost Curve.
A, B, C and D are the activities. Their normal and crash duration and associated costs are given in thr table below:
Activity Normal Norma Crash Crash
Duration l cost Duration Cost
(Days) (Rs.) (days) (Rs.)
A 8 6000 4 12000
B 4 2000 2 14000
C 10 4000 4 8000
D 6 4000 4 800
For the entire project the indirect cost is Rs. 1000 per day. Calculate optimum cost and optimum duration for the
project. 14
2
B-C-D Critical Path
B C 10(4)
4(2)
A D
1 3 4
8(4) 6(4)
6. The initial cost of an equipment is Rs. 1100, salvage value is Rs. 100. Life of equipment is 5 years. The rate for sinking
fund is 8%. Calculate the yearly depreciation and book value at end of each year by any 3 methods. Present the values in
tabular form. 14
7. (a) Explain the suitability of the various materials used for construction of prefabricated structure. 7
(b) What is float? Differentiate between float and slack. Also explain different types of floats used in CPM network
analysis. 7
8. Write the name of any four earth excavating equipments and also explain any one in detail?
Estimate the efficiency of bulldozer for the following for the following operating conditions:
(a) Material- Sandy loam top soil
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(b) Swell- 25%
(c) Haul distance- 45 m
(d) Mould board size- 3.0 m long, 1.0 m high
(e) Rated mould board capacity- 3 cu.m loose volume
(f) Operating factor- 50 min/hr
(g) Probable round trip time 1.87 min
9. What is dummy activity? Explain errors in network analysis. Draw the network diagram of a project having seven
activities A, B and C run concurrently. Activities predecessor relationships are as follows.
Activity Immediate
predecessors
D A
E B
F C
Activity G is the last operation of the project, and is also immediate successor to D, E and F.
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