Microcontrollers and Applications Quiz | Microcontrollers and Applications MCQs and Answers

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Questions
81 Which among the below stated statements does not exhibit the characteristic feature of 16-bit microcontroller?
A Large program & data memory spaces
B High speed
C I/O Flexibility
D Limited Control Applications

Answer: Limited Control Applications
82 Which word size is approved to be of greater importance for performing the small computational tasks along with its storage usability feature adopted by ASCII code?
A 4-bit
B 8-bit
C 16-bit
D 32-bit

Answer: 8-bit
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83 Which minimum mode signal is used for demultiplexing the data and address lines with the assistance of an external latch in a microprocessor while accessing memory segment?
A INTA
B DTE
C HOLD
D ALE

Answer: ALE
84 Why do the microprocessors possess very few bit manipulating instructions?
A Because they mostly operate on bits/ word data
B Because they mostly operate on byte/word data
C Both a & b
D None of the above

Answer: Because they mostly operate on byte/word data
85 How does the microcontroller communicate with the external peripherals/memory?
A via I/O ports
B via register arrays
C via memory
D All of the above

Answer: via I/O ports
86 Which functioning element of microcontroller generate and transmit the address of instructions to memory through internal bus?
A Instruction Decoding Unit
B Timing and Control Unit
C Program Counter
D Arithmetic Logic Unit

Answer: Program Counter
87 Which instructions contribute to an effective adoption or utilization of stack memory which usually plays a crucial role in storage of intermediate results?
A ACALL
B RETI
C PUSH & POP
D All of the above

Answer: All of the above
88 What is the status of stack pointer for the execution of PUSH and POP operations?
A It gets post-decremented for PUSH & pre-incremented for POP
B It gets pre-incremented for PUSH & post-decremented for POP
C It gets pre-incremented for PUSH as well as POP
D It gets post-decremented for PUSH as well as POP

Answer: It gets pre-incremented for PUSH & post-decremented for POP
89 Which among the category of program branching instructions allow 16 bit address to be specified & can jump anywhere within 64K block of program memory?
A Long jumps (LJMP)
B Short jumps (SJMP)
C Absolute jumps (AJMP)
D All of the above

Answer: Long jumps (LJMP)
90 What is the possible range of transfer control for 8-bit relative address especially in 2’s complement form with respect to the first byte of preceding instruction?
A -115 to 132 bytes
B -130 to 132 bytes
C -128 to 127 bytes
D -115 to 127 bytes

Answer: -128 to 127 bytes
91 Which among the single operand instructions complement the accumulator without affecting any of the flags?
A CLR
B SETB
C CPL
D All of the above

Answer: CPL
92 Which rotate instruction/s has an ability to modify CY flag by moving the bit-7 & bit-0 respectively to an accumulator?
A RR & RL
B RLC & RRC
C RR & RRC
D RL & RLC

Answer: RLC & RRC
93 Which form of instructions also belong to the category of logical instructions in addition to bitwise logical instructions?
A Single-operand instructions
B Rotate instructions
C Swap instructions
D All of the above

Answer: All of the above
94 What can be the oscillator period for the multiplication operation of A & B in accordance to 16-bit product especially in B:A registers?
A 12
B 24
C 36
D 48

Answer: 48
95 How many bytes are supposed to get occupied while subtracting indirect RAM from an accumulator along with borrow under the execution of SUBB A, @Ri?
A 1
B 2
C 3
D 4

Answer: 1
96 Which flag allow to carry out the signed as well as unsigned addition and subtraction operations?
A CY
B OV
C AC
D F0

Answer: OV
97 What does the instruction XCHD A, @Ri signify during the data transfer in the program execution?
A Exchange of register with an accumulator
B Exchange of direct byte with an accumulator
C Exchange of indirect RAM with an accumulator
D Exchange of low order digit indirect RAM with an accumulator

Answer: Exchange of low order digit indirect RAM with an accumulator
98 Which instruction should be adopted for moving an accumulator to the register from the below mentioned mnemonics?
A MOV A, Rn
B MOV A, @ Ri
C MOV Rn, A
D MOV direct, A

Answer: MOV Rn, A
99 What kind of PSW flags remain unaffected by the data transfer instructions?
A Auxillary Carry Flags
B Overflow Flags
C Parity Flags
D All of the above

Answer: All of the above
100 How many single byte, two-byte and three-byte instructions are supported by MCS-51 from the overall instruction set?
A 55 – single byte, 35 two-byte & 21 three-byte instructions
B 50 – single byte, 30 two-byte & 31 three-byte instructions
C 42 – single byte, 45 two-byte & 24 three-byte instructions
D 45 – single byte, 45 two-byte & 17 three-byte instructions

Answer: 45 – single byte, 45 two-byte & 17 three-byte instructions

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