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Free download in PDF Microcontrollers and Applications Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(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
(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
(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
(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
(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
(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
(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
(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
(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
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
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
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
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
38
Which operations are performed by stack pointer during its incremental phase?
[A]
Push
[B]
Pop
[C]
Return
[D]
All of the above
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
40
What kind of instructions usually affect the program counter?
[A]
Call & Jump
[B]
Call & Return
[C]
Push & Pop
[D]
Return & Jump
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