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MCQs

Total Questions : 275 | Page 26 of 28 pages
Question 251. Using one 8259 IC is equivalent to providing …………. INTR pins on 8085
  1.     8
  2.     12
  3.     16
  4.     18
 Discuss Question
Answer: Option A. ->  8
Question 252. Pick up the programmable interrupt controller from the following
  1.     8259
  2.     8257
  3.     8275
  4.     8279
 Discuss Question
Answer: Option A. ->  8259
Question 253. The maximum number of seven segment displays that can be connected to 8279 is
  1.     16
  2.     12
  3.     18
  4.     8
 Discuss Question
Answer: Option C. ->  18
Question 254. Identify the non-programmable interfacing device from the following
  1.     8255.
  2.     8295.
  3.     8212.
  4.     8257.
 Discuss Question
Answer: Option C. ->  8212.
Question 255. Total number of modes the 8253 can work
  1.     8
  2.     6
  3.     12
  4.     4
 Discuss Question
Answer: Option B. ->  6
Question 256. A high on RESET OUT signifies that
  1.     processing can begin when this signal goes high
  2.     all the registers and counters are being reset
  3.     all the registers and counters are being reset and this signal can be used to reset external support chip
  4.     all the registers of the CPU are being reset
 Discuss Question
Answer: Option C. ->  all the registers and counters are being reset and this signal can be used to reset external support chip
Question 257. Maximum of how many devices can be connected simultaneously to the microprocessor via 8257 in DMA data transfer mode?
  1.     4
  2.     10
  3.     6
  4.     8
 Discuss Question
Answer: Option A. ->  4
Question 258. The frequency of the driving network connected between pins 1 and 2 of 8085 microprocessor is
  1.     equal to the desired frequency
  2.    None of these
  3.     four times the desired frequency
  4.     twice the desired frequency
 Discuss Question
Answer: Option D. ->  twice the desired frequency
Question 259. A microprocessor with a 12-bit address bus will be able to access
  1.     10 K bytes
  2.     8 K bytes
  3.     1 K bytes
  4.     4 K bytes
 Discuss Question
Answer: Option D. ->  4 K bytes
Question 260. How can we make any bit of a register “0”?
  1.     AND that bit with “1” and remaining bits with “0”.
  2.     AND that bit with “0” and remaining bits with “1”.
  3.     OR that bit with “1” and remaining bits with “0”.
  4.     OR that bit with “0” and remaining bits with “1”.
 Discuss Question
Answer: Option B. ->  AND that bit with “0” and remaining bits with “1”.

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