What is polled I/O and what is its major characteristic? A) ...

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What is polled I/O and what is its major characteristic?
 
  A) Each individual I/O device is checked sequentially on a regular basis to see if it needs to be serviced. This speeds up the I/O process.
  B) Individual I/O devices regularly send inquiries to the CPU to see if it is available for a specific I/O operation; if the CPU is available, the I/O device then proceeds to carry out its operation.
  C) Each individual I/O device is checked sequentially on a regular basis to see if it needs to be serviced. This slows down the CPU operation.
  D) Each individual I/O device is serviced sequentially on a regular basis. This speeds up the I/O process.

Question 2

What is an advantage of MOSFET's over BJT's in power applications?
 
  A) BJT's have lower on resistance
  B) MOSFETs have lower on resistance
  C) MOSFETs are somewhat immune to thermal runaway
  D) both a and c

[maya.nigrin17@yahoo.com]

Answer to Question 1

C

Answer to Question 2

D

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