CPM Problem

Submitted by amber on Thu, 02/07/2013 - 07:21

 Hi Please help me in solving below question, I have calculated it assuming activity A start on Zero day. Please provide explation how you solved, my answers are highlighted in green, I have also listed down actual answer given for Q43 & Q44 my answer is 5 but it is not in given option only, not sure where I am making mistake.


A1--B3--D2--F4--H5


A1---C3--G4--H5


A1--B3--E7--G4--H5


 


A schedule was developed for a project to install windows in an apartment building. The project is a rush job, and the contractor has agreed to schedule the work on a single shift basis but will work seven days per week until the job is done. The project is to begin on May 1.

42. What day in May will activity D have for its early finish date?
a. May 13
b. May 6
c. May 7
d. May 5


43. What is the free float for activity F?
a. 6
b. 7
c. 0
d. 8


44. What is the free float for activity D?
a. 6
b. 7
c. 8
d. 0


45. What is the critical path of the project?
a. A B E G H
b. A B D F H
c. A C G H
d. A B E D F H


46. What is the late start for activity F?
a. May 10
b. May 11
c. May 12
d. May 14


47. How long is the project in days?
a. Nineteen
b. Twenty
c. Twenty-one
d. Eighteen


48. What is the early start for activity F?
a. May 7
b. May 6
c. May 5
d. May 4


49. If there is a delay in activity F of six days, what is the effect on the project completion date?
a. Increases one day
b. No change to project completion date
c. Increases two days
d. Increases three days


50. What is the early finish date for activity A?
a. May 1
b. May 2
c. May 3
d. May 4


51. The above diagram is called:
a. Activity on arrow network diagram
b. Network diagram
c. Precedence diagram
d. Gantt chart


52. If a project manager were to make Thanksgiving dinner, two of the activities that might be of concern would be roasting the turkey and baking the sweet potatoes. In order to ensure that these two items will be finished cooking and will come out of the oven at the same time, what type of relationship should he or she use in the schedule between these two activities?
a. Finish – finish
b. Start – start
c. Finish – start
d. Start – finish


Answers are


42. B
May 6


43.B
7


44. D
0


45.A
A B E G H


46. C
May 12


47. B
Twenty


48. C
May 5


49. B
No change to project completion date


50. A
May 1


51. C
Precedence diagram


52. A
Finish – finish

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sspawar

Thu, 02/07/2013 - 09:18

 



ONE START METHOD

            
   

2

4

5

6

7

10

  
     

B/3

  

D/2

  

F/4

  

1(1st MAY)

1

 

 

 

  
 

A/1

2

4

10

11

12

15

  
   

5

11

12

15

16

20

1

1

 

  

E/7

 

G/4

 

H/5
   

 

  

 

  
   

 

5

11

12

15

16

20
   

2

4

 

 

      
     

C/3

  

 

      
               
   

9

11

          
                 

ZERO START METHOD

            
   

1

4

4

6

6

10

  
     

B/3

  

D/2

  

F/4

  

0(30th April)

1

 

 

 

  
 

A/1

1

4

9

11

11

15

  
   

4

11

11

15

15

20

0

1

 

  

E/7

 

G/4

 

H/5
   

 

  

 

  
   

 

4

11

11

15

15

20
   

1

4

 

 

      
     

C/3

  

 

      
               
   

8

11

          

 

sspawar

Sun, 03/03/2013 - 11:31

My Answers are

42. B May 6

43. There is no correct option, answer is 5 ( FF = ESs - ESq - Dq) s stands for successor q stands for questioned activity

44. D 0 (correct ) with above formula

45.A  A B E G H

46. C May 12( it is as per 1 start method. 0 start and 1start method only difference is that ES and LS or different by 1 day. In this one start method is more appropriate. You can understand by both figues)

47. B Twenty

48. A May 7 ( it is as per 1start method)

49. B One day delay ( TF = LS-ES =5)

50. A May 1

51. C Precedence diagram ( AON also called )

52. A Finish – finish

steelproject2012

Sun, 02/10/2013 - 22:49

q43 and q49 have wrong answers as explained by sspawar.

Tq43: he free float is akin to the number of resting days b4 the next activity starts;

I calculate Free float as FF = ESs - EFp - 1;

If we are to calculate FF for activity C: It's completed on May4th and the next activity is G; starts on May 12th.   There are 7 resting days i.e 12 - 4 - 1 = 7 days.

q49: If activity F is delayed for 6 days, total estimated duration for ABDFH = 15+6 = 21; That's an additional 1 day to the original deadline.thus making this path the new CP.

sspawar

Mon, 02/11/2013 - 01:23

 Dear Penuel,

Pl see in Q 43 , he is asking for activity F, while you are calculating for C.

For Q 49, my answer is - increase 1 day  (A), = means the same 20+1 = 21 days CP Duration.

It seems you are referring from available source which has changes in Q 43 and Questions are solved (Q49 and Q43) in different way .

 

steelproject2012

Mon, 02/11/2013 - 10:51

Hi sspawar, thanks for ur observations;

As per q43, i only gave fiurther explanations by calculating free float of C; I know very well what the question asked for. probably, i should hv started wit "for example, if we were to calculate"

Per q49: u explained hw u got 1; meanwhile, to reinforce my understanding, i had to explain my own ways; Expressing an oppinion either repetetive or in a different way ultimately helps to internalize the concepts; notwithstanding the afct that it might lead to redundancy

These steps were also not meant to undermine what u wrote;  however,  I appreciate ur concerns.

 

Regards.

sspawar

Tue, 02/12/2013 - 04:16

 I got it, sorry, it is just because of misinterpretation by me of first line of your earlier reply. 

sunitaPMP

Sat, 03/02/2013 - 19:20

Hello Pawar Ji,

43. What is the free float for activity F?
a. 6
b. 7
c. 0
d. 8

For this question am getting free float as 5 days.But i do not see that  in the options.Can you tell me your ans for this with explanation?I got lost while checking for your ans in your reply.

 

Thanks...

 

sspawar

Sun, 03/03/2013 - 11:39

 answer 5 is right

there is no correct option.

 

sunitaPMP

Sat, 03/02/2013 - 19:47

Hello Pawar Ji,

Also pls explain

48. What is the early start for activity F
a. May 7
b. May 6
c. May 5
d. May 4

Am getting early start date for F as May 6 (taking zero method).But the ans C May 5.Can u pls explain?

 

 

sspawar

Sun, 03/03/2013 - 11:41

 mock answer  C is wrong, 

as per 1 start method - A is correct-----7

as per 0 start method - B is correct ---6

Renji2013

Sat, 03/30/2013 - 11:05

Hi,


Im not able to do this math. The activity F has a lag of 2 days . FS -2. Hence, in the network diagram how will I account for it while calcluating float. Can I take the earliest and latest start time incremented by 2 days . ie Earlist start time = 8 instead of 6.


Please explain


Renji