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Session 6 Optional Mini Project Quiz (Printer Simulation)

Question 1

What limited resource is modeled in the printer project?

  • CPU temperature
  • Available printers
  • Python packages
  • Git branches

Answer: 2 Type: single Time: 35 Explanation: The project models many files sharing only three printers.

Question 2

Why is queue.Queue useful for the printers?

  • It edits PDF files automatically
  • It replaces Python functions
  • It guarantees jobs take the same time
  • It stores available printer names and gives one to each job

Answer: 4 Type: single Time: 45 Explanation: The queue holds printer names, so each job can claim one available printer.

Question 3

What should happen after a print job finishes?

  • The printer should be returned to the queue
  • The printer should be deleted
  • The job should run forever
  • All waiting jobs should be cancelled

Answer: 1 Type: single Time: 40 Explanation: Returning the printer makes it available for another waiting job.

Question 4

Why is a finally block useful in print_file(...)?

  • It runs only if no errors happen
  • It creates new printers
  • It helps ensure the printer is returned even if something goes wrong
  • It sorts the print jobs

Answer: 3 Type: single Time: 45 Explanation: finally is used for cleanup actions that should happen after success or failure.

Question 5

If there are 10 print jobs and 3 printers, how many jobs should be actively printing at the same time?

  • At most 1
  • At most 3
  • Exactly 10
  • Unlimited

Answer: 2 Type: single Time: 35 Explanation: There are only three printers, so at most three jobs can print simultaneously.

Question 6

What is the purpose of message_lock in the project?

  • To download files
  • To create random filenames
  • To remove print jobs
  • To keep printed status messages readable

Answer: 4 Type: single Time: 40 Explanation: The lock avoids multiple threads mixing their status output.

Question 7

What could happen if a printer is never returned to the queue?

  • More printers appear
  • The queue becomes faster
  • Future jobs may wait forever or the system may slow down
  • Python automatically fixes it

Answer: 3 Type: single Time: 45 Explanation: Losing a resource from the pool can block later jobs.

Question 8

Why does the output order vary between runs?

  • Parallel jobs finish at different times
  • Python cannot print strings
  • The queue deletes old jobs
  • The list is invalid

Answer: 1 Type: single Time: 40 Explanation: In parallel execution, scheduling and random print durations affect finish order.

Question 9

Why might a real printer system use priorities?

  • Priorities prevent all errors automatically
  • Priorities make printers unlimited
  • Priorities remove the need for queues
  • Some jobs may be more urgent than others

Answer: 4 Type: single Time: 40 Explanation: Real systems often need urgent jobs to move ahead of less urgent ones.

Question 10

Which design best matches the project?

  • One worker writes one local variable
  • Many workers share a limited pool of named resources
  • No task ever waits
  • Every job gets its own new printer

Answer: 2 Type: single Time: 45 Explanation: The printer project is a resource-pool simulation with named resources.