Case

Q.1 Consider the air transportation system. Many flights land and depart from city’s airport. Some of the big cities may have more than one airport. Every flight belongs to specific airline. The planes may have many flights to different airports. Each plane is identified with serial number and model. E.g. hypersonic. There are specific pilots for each airline and they fly many flights. Each flight is identified by flight number and date on which flight is scheduled. The passenger reserves a seat for a flight. The seat is identified by a location. Prepare a class diagram for above description.

Q.2 Prepare an object diagram for above description assuming your round trip in last month to London. Include at least one instance of each class. The flight was arranged on a hypersonic plane. A friend went with you but decided to stay there. Captain Johnson was your pilot on both flights. You had a different seat each way, but you noticed it was on the same plane.

Q.3 Consider a vending machine. Consider the processes:

1. Buy a beverage: The vending machine 2. delivers a beverage after a customer selects and pays for it.3. Perform Scheduled Maintenance: The repair technician performs

the periodic service on the vending machine necessary to keep it in good working condition.

4. Make repairs: The repair technician performs the unexpected service on the vending machine necessary to repair a problem in its operation.

5. Load Items: A stock clerk adds items into the vending machine to add its stock of beverages.

Q.4 The vending machine delivers a beverage after a customer selects and pays for it. The machine starts in the waiting state in which it displays the message “Enter coins”. When the customer inserts coins into the machine, the machine enters into “Ready” state. When the customer pushes the ok button, the machine goes in “Dispense” state. In this state, the machine dispenses the corresponding item. The machine goes in “Out of Stock” state if item is not loaded. Draw the state transition diagram for above description.

Q.5 The vending machine delivers a beverage after a customer selects and pays for it. The machine starts in the waiting state in which it displays the message “Enter coins”. When the customer inserts coins into the machine,

the machine displays total value of money entered. The customer pushes a button. The machine dispenses a corresponding item and make change, if the cost of the item is less than the money inserted. If the cost of the item is greater than money inserted, the machine shows the message as “Insufficient money”. Draw the sequence diagram for above description.

Q.6 A person may have multiple magazine subscriptions. A magazine has multiple subscribers. For each subscription, it is important to track the date and amount of each payment as well as the current expiration date. Draw the class diagram for above description.

Q.7 A person may have multiple magazine subscriptions. A magazine has multiple subscribers. For each subscription, it is important to track the date and amount of each payment as well as the current expiration date. Draw the class diagram with association class for above description.

Q.8 Consider the free lancing of software development. The programmers use different programming languages to develop many projects. Assume the programmer Mr.X is involved in two projects accounting system and CAD program. Mr. X is using .NET as a programming language and C Programming for accounting system. Draw the class diagram and instance diagram for above description. (Hint: Use ternary association)

Q.9 Prepare a class diagram for a graphical document editor that supports grouping. Assume that a document consists of several sheets. Each sheet contains drawing objects, including text, geometrical objects and groups. A group is simply a set of drawing objects. A geometrical object includes circle, ellipse, rectangles, lines and squares.

Q.10 Prepare an activity diagram for computing a restaurant bill. There should be a charge for each delivered item. The total amount should be subject to tax and service charge of 18% for groups of six or more. Any coupons charge submitted by the customer is subtracted from bill.

Q.11 The following is the partial taxonomy of rotating electrical machines. Electrical machines may be categorized for analysis purposes into ac machines or dc machines. Some of the machines are synchronous motors, small induction motors, universal motors and permanent magnet motors.An ac machine may be synchronous or induction. Universal motors are used where high speed is needed such as blenders or vacuum cleaners. Permanent magnet motors are used in toys and will work only on dc. Prepare a class diagram showing how the categories and machines relate to each other. Use multiple inheritances where ever found appropriate.

Q.12 Prepare a class diagram for UML concepts like class, attribute, association, association end, multiplicity, class name, attribute name.

Q.13 Consider the class for telephone line with following activities and states: As a start of a call, the telephone line is idle. When the phone receiver is picked from hook, it gives a dial tone and can accept the dialing of digits. If after getting dial tone, if the user doesn’t dial number within time interval then time out occurs and phone line gets idle. After dialing a number, if the number is invalid then some recorded message is played.Upon entry of a valid number, the phone system tries to connect a call & routes it to proper destination. If the called person answers the phone, the conversation can occur. When called person hangs up, the phone disconnects and goes to idle state. Draw the state transition diagram for above description of telephone line.

Q.14 Consider a simple digital watch which has a display and two buttons to set it, the A button and the B button. The watch has two modes of operation, display time mode, the watch displays hours and minutes, separated by a flashing colon.The set time mode has two submodes: set hours and set minutes. The A button selects modes. Each time it is pressed, the mode advances in sequence: display, set hours, set minutes, display etc.Within the submodes, the B button advances the hours or minutes once each time it is pressed. Buttons must be released before they can generate another event.Draw the state transition diagram for above described digital watch.

Q.15 Develop a class diagram for following description:The telephone agent uses an order registry and customer catalog to obtain access to an order & a customer respectively.The order registry uses an order number as a qualifier to select particular order instance. A customer catalog uses customer name and phone number as a qualifier to select particular customer.The attributes of an order are the order numbers and time when it is placed. The order consists of many items.An item has item_number, a quantity, unit price. It also has reference to catalog item which represents listing. When an order is cancelled or committed, it cancels or commits each of its items first.When an order’s total price method is invoked, the order calls the total price method of each of items and returns the sum.

Q.16 The telephone agent uses an order registry and customer catalog to obtain access to an order & a customer respectively.

The order registry uses an order number as a qualifier to select particular order instance. A customer catalog uses customer name and phone number as a qualifier to select particular customer.The attributes of an order are the order numbers and time when it is placed. The order consists of many items.An item has item_number, a quantity, unit price. It also has reference to catalog item which represents listing. When an order is cancelled or committed, it cancels or commits each of its items first.When an order’s total price method is invoked, the order calls the total price method of each of items and returns the sum.The telephone agent wants to cancel the item with item number as I101 from order having order number O123. Show the messages in sequence diagram for cancellation of item.

Q.17 The telephone agent uses an order registry and customer catalog to obtain access to an order & a customer respectively.The order registry uses an order number as a qualifier to select particular order instance. A customer catalog uses customer name and phone number as a qualifier to select particular customer.The attributes of an order are the order numbers and time when it is placed. The order consists of many items.An item has item_number, a quantity, unit price. It also has reference to catalog item which represents listing. When an order is cancelled or committed, it cancels or commits each of its items first.When an order’s total price method is invoked, the order calls the total price method of each of items and returns the sum.The telephone agent wants to cancel the item with item number as I101 from order having order number O123. Show the messages in collaboration diagram for cancellation of item.

Q.18The telephone agent uses an order registry and customer catalog to obtain access to an order & a customer respectively.The order registry uses an order number as a qualifier to select particular order instance. A customer catalog uses customer name and phone number as a qualifier to select particular customer.The attributes of an order are the order numbers and time when it is placed. The order consists of many items.An item has item_number, a quantity, unit price. It also has reference to catalog item which represents listing. When an order is cancelled or committed, it cancels or commits each of its items first.When an order’s total price method is invoked, the order calls the total price method of each of items and returns the sum. Prepare a use case diagram for above description.

Q.19 Develop a class diagram to track states of machines in a factory consisting of several machines. Each machine is in one of several states: running, idle, waiting, down for unscheduled maintenance, down for scheduled maintenance or off.A running machine is currently processing an order. An idle machine is available for processing but is currently without an order to process. The machine is in down state for scheduled or unscheduled maintenance. The operator is responsible to change the state.Each machine has maintenance schedule. Each schedule has a date of last maintenance and date of next scheduled maintenance.When the date of next maintenance arrives, the operator sends the machine down for scheduled maintenance.Each machine is connected to a failure monitor, which senses hardware failure in the machine. When the monitor senses a failure, it informs the machine. The machine changes to the unscheduled maintenance state.All changes of machine states must be entered in a log. Each entry in the log includes date and time of the state change, which machine changed state, the states from and to.

Q.20 Develop a state transition diagram to track states of machines in a factory consisting of several machines. Each machine is in one of several states: running, idle, waiting, down for unscheduled maintenance, down for scheduled maintenance or off.A running machine is currently processing an order. An idle machine is available for processing but is currently without an order to process. The machine is in down state for scheduled or unscheduled maintenance. The operator is responsible to change the state.Each machine has maintenance schedule. Each schedule has a date of last maintenance and date of next scheduled maintenance.When the date of next maintenance arrives, the operator sends the machine down for scheduled maintenance.

Each machine is connected to a failure monitor, which senses hardware failure in the machine. When the monitor senses a failure, it informs the machine. The machine changes to the unscheduled maintenance state.All changes of machine states must be entered in a log. Each entry in the log includes date and time of the state change, which machine changed state, the states from and to.

Q.21 Develop a use case diagram to track states of machines in a factory consisting of several machines. Each machine is in one of several states: running, idle, waiting, down for unscheduled maintenance, down for scheduled maintenance or off.A running machine is currently processing an order. An idle machine is available for processing but is currently without an order to process. The machine is in down state for scheduled or unscheduled maintenance. The operator is responsible to change the state.Each machine has maintenance schedule. Each schedule has a date of last maintenance and date of next scheduled maintenance.When the date of next maintenance arrives, the operator sends the machine down for scheduled maintenance.Each machine is connected to a failure monitor, which senses hardware failure in the machine. When the monitor senses a failure, it informs the machine. The machine changes to the unscheduled maintenance state.All changes of machine states must be entered in a log. Each entry in the log includes date and time of the state change, which machine changed state, the states from and to.

Q.23 A customer decides to upgrade her PC and purchase a DVD player. She begins by calling the sales department of PC vendor and they tell her to contact customer support. She than calls customer support and they put her on hold while talking to engineering. Finally, customer support tells the customer about several supported DVD options. The customer chooses a DVD and it is shipped by the mail department. The customer receives the DVD , installs it satisfactorily and then mails her payment to accounts department. Draw the activity diagram for above description.

Q.24 A customer decides to upgrade her PC and purchase a DVD player. She begins by calling the sales department of PC vendor and they tell her to contact customer support. She than calls customer support and they put her on hold while talking to engineering. Finally, customer support tells the customer about several supported DVD options. The customer chooses a DVD and it is shipped by the mail department. The customer receives the DVD , installs it satisfactorily and then mails her payment to accounts department. Draw the sequence diagram for above description.

Q.25 A customer decides to upgrade her PC and purchase a DVD player. She begins by calling the sales department of PC vendor and they tell her to contact customer support. She than calls customer support and they put her on hold while talking to engineering. Finally, customer support tells the customer about several supported DVD options. The customer chooses a DVD and it is shipped by the mail department. The customer receives the DVD , installs it satisfactorily and then mails her payment to accounts department. Draw the collaboration diagram for above description.

Q.26 The objective of the system is to automate all the activities of the canteen right from purchasing and to maintaining the kitchen. The system should maintain a detailed account of all provisions bought and food served at the canteen. Several inquiry facilities should also be provided to view expenses incurred, planned menus/cash payment. In short following are the list of facilities which should be provided with the system: list of items served with rates, daily menu preparation, daily transactions, availability of information on intranet for reports and inquiries, purchases and issues.

Draw the use case diagram for above description.

Q.27 The objective of the system is to automate all the activities of the canteen right from purchasing and to maintaining the kitchen. The system should maintain a detailed account of all provisions bought and food served at the canteen. Several inquiry facilities should also be provided to view expenses incurred, planned menus/cash payment. In short following are the list of facilities which should be provided with the system: list of items served with rates, daily menu preparation, daily transactions, availability of information on intranet for reports and inquiries, purchases and issues.Draw the class diagram based on use case approach for above description.

Q.28 Consider a book store in a shopping mall. The customer selects the books from racks to purchase. Prepare a sequence diagram for bookstore checkout system. The customer brings selected books to cashier. The cashier scans each item with checkout system to prepare an order. The cashier requests to customer for payment. The customer gives credit card to cashier. The verifier and checkout system scans the card. The verifier accepts the card and payment is accepted. Customer signs the credit card slip. The purchased books are handed over to customer.

Q.29 Consider a book store in a shopping mall. The customer selects the books from racks to purchase. Prepare a collaboration diagram for bookstore checkout system. The customer brings selected books to cashier. The cashier scans each item with checkout system to prepare an order. The cashier requests to customer for payment. The customer gives credit card to cashier. The verifier and checkout system scans the card. The verifier accepts the card and payment is accepted. Customer signs the credit card slip. The purchased books are handed over to customer.