Microcontrollers and Applications Quiz | Microcontrollers and Applications Objective Type Questions and Answers

(21) Which flags of status register are most likely to get affected by the single-cycle increment and decrement instructions?
[A] P Flags
[B] C Flags
[C] OV Flags
[D] Z Flags
Answer: Z Flags
(22) Where is the result stored after an execution of increment and decrement operations over the special – purpose registers in PIC?
[A] File Register
[B] Working Register
[C] Both a & b
[D] None of the above
Answer: Both a & b

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(23) Which instruction is applicable to set any bit while performing bitwise operation settings?
[A] bcf
[B] bsf
[C] Both a & b
[D] None of the above
Answer: bsf
(24) What does the ‘program idata’ section of data memory contain in C-18 Compiler?
[A] statically assigned/allocated initialized user variables
[B] statically assigned /allocated uninitialized user variables
[C] only executable instructions
[D] variables as well as constants
Answer: statically assigned/allocated initialized user variables
(25) In which aspects do the output functions specified in stdio.h differ from ANSI specified versions?
[A] Provision of MPLAB specific extensions
[B] Floating-point Format Support
[C] Data in Program Memory
[D] All of the above
Answer: All of the above
(26) Which command-line option of compiler exhibits the banner comprising overall number of errors, messages, warnings and version number after an accomplishment of the compilation process?
[A] help
[B] verbose
[C] overlay
[D] char
Answer: verbose
(27) Which general purpose register holds eight bit divisor and store the remainder especially after the execution of division operation?
[A] A-Register
[B] B-Register
[C] Registers R0 through R7
[D] All of the above
Answer: B-Register
(28) Which characteristic/s of accumulator is /are of greater significance in terms of its functionality?
[A] Ability to store one of the operands before the execution of an instruction
[B] Ability to store the result after the execution of an instruction
[C] Both a & b
[D] None of the above
Answer: Both a & b
(29) Which among the below mentioned devices of MCS-51 family does not possess two 16 -bit timers/counters?
[A] 8031
[B] 8052
[C] 8751
[D] All of the above
Answer: 8052
(30) Which condition approve to prefer the EPROM/ROM versions for mass production in order to prevent the external memory connections?
[A] size of code < size of on-chip program memory
[B] size of code > size of on-chip program memory
[C] size of code = size of on-chip program memory
[D] None of the above
Answer: size of code < size of on-chip program memory
31 Why is CHMOS technology preferred over HMOS technology for designing the devices of MCS-51 family?
[A] Due to higher noise immunity
[B] Due to lower power consumption
[C] Due to higher speed
[D] All of the above
Answer: All of the above
32 Which register usually store the output generated by ALU in several arithmetic and logical operations?
[A] Accumulator
[B] Special Function Register
[C] Timer Register
[D] Stack Pointer
Answer: Accumulator
33 Which control signal/s is/are generated by timing and control unit of 8051 microcontroller in order to access the off-chip devices apart from the internal timings?
[A] ALE
[B] PSEN
[C] RD & WR
[D] All of the above
Answer: All of the above
34 Why is the speed accessibility of external data memory slower than internal on-chip RAM?
[A] Due to multiplexing of lower order byte of address-data bus
[B] Due to multiplexing of higher order byte of address-data bus
[C] Due to demultiplexing of lower order byte of address-data bus
[D] Due to demultiplexing of higher order byte of address-data bus
Answer: Due to multiplexing of lower order byte of address-data bus
35 Which data memory control and handle the operation of several peripherals by assigning them in the category of special function registers?
[A] Internal on-chip RAM
[B] External off-chip RAM
[C] Both a & b
[D] None of the above
Answer: Internal on-chip RAM
36 Which operations are performed by the bit manipulating instructions of boolean processor?
[A] Complement bit
[B] Set bit
[C] Clear bit
[D] All of the above
Answer: All of the above
37 How many registers can be utilized to write the programs by an effective selection of register bank in program status word (PSW)?
[A] 8
[B] 16
[C] 32
[D] 64
Answer: 32
38 Which operations are performed by stack pointer during its incremental phase?
[A] Push
[B] Pop
[C] Return
[D] All of the above
Answer: Push
39 Which is the only register without internal on-chip RAM address in MCS-51?
[A] Stack Pointer
[B] Program Counter
[C] Data Pointer
[D] Timer Register
Answer: Program Counter
40 What kind of instructions usually affect the program counter?
[A] Call & Jump
[B] Call & Return
[C] Push & Pop
[D] Return & Jump
Answer: Call & Jump