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  1. Flickering is pronounced
  2. Brightness can be seen easily
  3. Sharper and more accurate synchronization
  4. It can be performed quickly
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Option 3 : Sharper and more accurate synchronization

  • Lamps bright synchronization preferred to lamps dark because it gives sharper and more accurate synchronization.
  • Synchronizing bright and is generally preferred because it is found to be easier to determine when a lamp is at full brilliancy than when it is absolutely Dark (current less), for it may be carrying quite a substantial current without reddening the filament. The lamp may even become dark with a considerable difference in voltage.


The ideal synchronizing device should perform three distinct functions:

  • It should indicate whether the incoming machine is running too fast or too slow.
  • It should indicate the same amount of phase difference.
  • It should indicate the exact moment of phase coincidence or synchronism.
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Related Questions

Consider the following solution to the producer-consumer synchronization problem. The shared buffer size is . Three semaphores empty, full and mutex are defined with respective initial values of 0, and 1. Semaphore empty denotes the number of available slots in the buffer, for the consumer to read from. Semaphore denotes the number of available slots in the buffer, for the producer to write to. The placeholder variables, denoted by P, Q, R, and S, in the code below can be assigned either empty or full. The valid semaphore operations are: wait ( ) and signal ( ). Producer: Consumer: do {         wait (P) ;         wait (mutex) ;         //Add item to buffer         signal (mutex) ;         signal (Q) ; } while (1) ; do {          wait (R) ;          wait (mutex) ;          //Consume item from buffer          signal (mutex) ;          signal (S) ; } while (1) ;   Which one of the following assignments to P, Q, R and S will yield the correct solution?
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