(SEM V) THEORY EXAMINATION 2018-19 QUANTITY ESTIMATION AND MANAGEMENT

QUANTITY ESTIMATION AND MANAGEMENT (RCE-503)

B.Tech | Semester V | Section-wise Important Questions & Notes

SECTION A – Very Short Answer (2 × 7 = 14 Marks)

This section tests basic definitions and concepts. Answers must be short and direct.

Important Questions

What is the use of a dummy activity in a network?        What do you mean by a cash flow diagram?

Define critical path.                                                          What is float in network analysis?

Define bar chart.                                                               What is estimation?

Define rate analysis.

Key Notes

Dummy activity: Used in network diagrams to show dependency; consumes no time or resources.

Cash flow diagram: Shows inflow and outflow of money during project duration.

Critical path: Longest path in a network; decides total project duration.

Float: Extra time an activity can be delayed without affecting project completion.

SECTION B – Short Answer / Numerical (5–7 Marks)

This section includes theory + numericals, mainly from PERT/CPM and project planning.

Important Questions

Explain CPM and PERT techniques.                                  Explain dummy activity with an example.

Explain cash flow analysis in construction projects.         Describe bar chart and its limitations.

Explain total float, free float, and independent float.

 Key Notes
 

CPM: Deterministic time estimates, used in construction.

PERT: Probabilistic, uses three-time estimates (to, tm, tp).

Bar chart: Simple planning tool but does not show dependency clearly.

Float calculations are very important numerically.

SECTION C – Long Answer / Numerical (High Weight)

This section is most scoring and usually includes network diagrams and probability questions.

Most Important Question

Calculate the time duration that will provide 90% probability of project completion

(using Z = 1.3 or 1.1 as given).

(Based on the PERT network diagram shown on Page 2)

 Key Notes for Solving

Expected time:

• Te=to+4tm+tp6T_e = \frac{t_o + 4t_m + t_p}{6}Te​=6to​+4tm​+tp​​

Variance:

• σ2=(tp−to6)2\sigma^2 = \left(\frac{t_p - t_o}{6}\right)^2σ2=(6tp​−to​​)2

Probability equation:

• Z=T−TeσZ = \frac{T - T_e}{\sigma}Z=σT−Te​​

Always:

Find critical path

Add variances

Apply Z-value formula