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

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Questions
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

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