Question

Match List-I (Description of activity floats) with List-II (Names of the floats) and select the correct answer using the codes given the lists:

List-I
A. Earliest start time of successor activity minus earliest activity in question minus the duration
B. Time available for an activity performance minus the duration of the activity
C. Excess of minimum available time over the required activity duration
D. Difference between total and free float of an activity

List-II
1. Total
2. Free
3. Interfering
4. Independent float
Codes:
A B C D

• A. 1 2 4 3
• B. 2 1 4 3
• C. 1 2 3 4
• D. 2 1 3 4

Answer 1

The correct option is B 2 1 4 3

Total float is the excess of maximum available time over the activity time.
$F_T=(T_L^j-T_E^i)-t^{ij}=LST-EST=LFT-EFT$

Free float is the excess of available time over the activity time when all jobs start as early as possible.
$F_F=(T_E^j-T_E^i)-t^{ij}=F_T-S_j$
Independent float is the excess of minimum available time over the activity time.
$F_{ID}=(T_E^j-T_E^i)-t^{ij}=F_F-S_i$
Interfering float is the difference between total float and free float
$F_{IN}=F_T-F_F=S_j$