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MCQs

Total Questions : 275 | Page 25 of 28 pages
Question 241. Pick out the matching pair
  1.     SID; SIM
  2.     READY; RIM
  3.     HOLD; DMA
  4.     S0;S1;wait status
 Discuss Question
Answer: Option D. ->  S0;S1;wait status
Question 242. S0 and S1 pins are used for
  1.     acknowledging the interrupt
  2.     indicating the processor’s status
  3.     serial communication
  4.    None of these
 Discuss Question
Answer: Option B. ->  indicating the processor’s status
Question 243. The stack is nothing but a set of
  1.     reserved I/O address space
  2.     reserved RAM address space
  3.     reserved ROM address space
  4.    None of these
 Discuss Question
Answer: Option B. ->  reserved RAM address space
Question 244. The execution of RST n instruction causes the stack pointer to
  1.     decrement by two
  2.    None of these
  3.     remain unaffected
  4.     increment by two
 Discuss Question
Answer: Option A. ->  decrement by two
Question 245. A single instruction to clear the lower nibble of accumulator in 8085 language assembly is
  1.     XRI 0FH
  2.     ANI F0H
  3.     ANI OFH
  4.     XRI FOH
 Discuss Question
Answer: Option B. ->  ANI F0H
Question 246. A sequence of two registers that multiplies the content of DE register pair by two and stores the result in HL register pair (in 8085 assembly language) is
  1.     XCHG & DAD H
  2.     PCHL & DAD D
  3.     XCHG & DAD B
  4.     XTHL & DAD H
 Discuss Question
Answer: Option A. ->  XCHG & DAD H
Question 247. In a vector interrupt
  1.     the branch address is assigned to a fixed location in memory.
  2.     none.
  3.     the interrupting source supplies the branch information to the processor through an interrupt vector.
  4.     the branch address is obtained from a register in the processor.
 Discuss Question
Answer: Option A. ->  the branch address is assigned to a fixed location in memory.
Question 248. Identify the programmable interval timer from the following
  1.     8253
  2.     8279
  3.     8252
  4.     8275
 Discuss Question
Answer: Option A. ->  8253
Question 249. Identify the communication interfacing device from the following
  1.     8257
  2.     8255
  3.     8155
  4.     8251
 Discuss Question
Answer: Option D. ->  8251
Question 250. Identify the programmable DMA controller from the following
  1.     8251
  2.     8253
  3.     8257
  4.     8279
 Discuss Question
Answer: Option C. ->  8257

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