System Analysis and Design

241. The objective of using decision trees is to

1. Expand a DFD so that a user can understand it
2. To specify sequence of conditions to be tested and actions to be taken
3. Describe a computational procedure that can be easily understood by a person
4. Use it as a tool in decision support system

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242. Decision Tables are preferred when

1. Too many conditions need to be tested
2. Sequencing of testing conditions is important
3. When there are many loops to be performed
4. When too many actions are to be taken

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243. Rule R3 is interpreted as follows:

1. If C1 is TRUE and C2 is TRUE then perform action A1 and A2
2. If C1 is TRUE or C2 is TRUE then perform action A3
3. If C1 is TRUE and C2 is TRUE then perform action A1 or A2
4. If C1 is TRUE and C2 is TRUE then perform action A3

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244. Structured English is preferred when

1. Too many conditions need to be tested
2. Sequencing of testing conditions is important
3. When there are many loops to be performed
4. When too many actions are to be taken

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245. Logical correctness of a specifications can be systematically checked by

1. Using decision trees
2. Using structured English
3. Using DFD’s
4. Using decision tables

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246. A data dictionary has information about

1. every data element in a data flow
2. only key data element in a data flow
3. only important data elements in a data flow
4. only numeric data elements in a data flow

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247. Structured English equivalent of the decision table "test" are given below

1. if C1 TRUE
   then if C2 TRUE
   then do A3
   else do A1 and A3
   end if
   else do A2
   end if
   
2. if C1 FALSE
   then do A2
   else if C2 TRUE
   then do A3
   else do A1 and A3
   end if
   end if
   
3. if C2 TRUE
   then if C1 TRUE
   then do A3
   else do A2
   end if
   else do A1 and A3
   end if
   
4. if C2 FALSE
   then if C1 TRUE
   then do A1 and A3
   else do A2
   end if
   else do A3
   end if
   
   

Which of the following are correct?

1. i and iii
2. i and ii
3. iii and iv
4. ii and iv

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248. Decision trees are superior to decision tables when

1. The number of conditions to be tested is very large
2. When sequence of testing conditions is not particularly important
3. When sequence of testing conditions is not particularly important
4. When a large number of actions are to be specified

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249. Structured English equivalents of decision table "test" are given below. Pick the right ones

1. if C1 TRUE and C2 FALSE then R=1 end if
   if C1 FALSE then R=2 end if
   if C1 TRUE and C2 TRUE then R=3 end if
   case (R)
   R=1; perform actions A1 and A3
   R=2; perform action A2
   R=3; perform action A3
   end case
2. if C1 TRUE and C2 FALSE then perform actions A1, A3 end if
   if C1 FALSE then perform action A2 end if
   if C1 TRUE and C2 TRUE then perform action A3 end if
3. case (C1 TRUE and C2 FALSE) Rule R1
   case (C1 FALSE) Rule R2
   case (C1 TRUE and C2 TRUE) Rule R3
   end case
4. if C1 TRUE and C2 TRUE then do Rule R3 end if
   if C1 TRUE and C2 FALSE then do Rule R1 end if
   if C1 TRUE then do Rule R2 end if

1. i and ii
2. i and iii
3. ii and iii
4. iii and iv

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250. A data dictionary has consolidated list of data contained in

1. dataflows
2. data stores
3. data outputs
4. processes

1. (i) and (iii)
2. (i) and (ii)
3. (ii) and (iv)
4. (i) and (iv)

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