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Free download in PDF Microcontrollers and Applications Multiple Choice 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.
(1)
Which among the below assertions represent the salient features of PIC in C-18 compiler?
[A]
Transparent read/ write access to an external memory
[B]
Provision of supporting an inline assembly during the necessity of an overall control
[C]
Integration with MPLAB IDE for source-level debugging
[D]
All of the above
(2)
Which register/s should set the SPEN bit in order to configure RC7/RX/DT pins as DT (data lines)?
[A]
TXSTA
[B]
RCSTA
[C]
Both a and b
[D]
None of the above
(3)
Which bit plays a salient role in defining the master or slave mode in TXSTA register especially in synchronous mode?
[A]
RSRC
[B]
CSRC
[C]
SPEN
[D]
SYNC
(4)
What is the status of shift clock supply in an USART synchronous mode?
[A]
Master-internally, Slave-externally
[B]
Master-externally, Slave-internally
[C]
Master & Slave (both) – internally
[D]
Master & Slave (both) – externally
Answer: Master-internally, Slave-externally
(5)
How is the baud rate specified for high-speed (BRGH = 1) operation in an asynchronous mode?
[A]
FOSC / 8 (X + 1)
[B]
FOSC / 16 (X + 1)
[C]
FOSC / 32 (X + 1)
[D]
FOSC / 64 (X + 1)
Answer: FOSC / 16 (X + 1)
(6)
Why is the flag bit TXIF tested or examined in the PIR1 register after shifting all the data bits during the initialization process of USART in asynchronous mode?
[A]
For ensuring the transmission of byte
[B]
For ensuring the reception of byte
[C]
For ensuring the on-chip baud rate generation
[D]
For ensuring the 9th bit as a parity
Answer: For ensuring the transmission of byte
(7)
What is the purpose of a special function register SPBRG in USART?
[A]
To control the operation associated with baud rate generation
[B]
To control an oscillator frequency
[C]
To control or prevent the false bit transmission of 9th bit
[D]
All of the above
Answer: To control the operation associated with baud rate generation
(8)
Where should the value of TX9 bit be loaded during the 9 bit transmission in an asynchronous mode?
[A]
TXSTA
[B]
RCSTA
[C]
SPBRG
[D]
All of the above
(9)
How many upper bits of SSPSR are comparable to the address located in SSPADD especially after the shifting of 8 bits into SSPSR under the execution of START condition?
[A]
7
[B]
8
[C]
16
[D]
32
(10)
transmitted, after an execution (set) of BF flag?
[A]
SCL line
[B]
SDA line
[C]
Both a & b
[D]
None of the above
(11)
Which command/s should be essentially written for I2C input threshold selection and slew rate control operations?
[A]
SSPSTAT
[B]
SSPIF
[C]
ACKSTAT
[D]
All of the above
(12)
Which bits assist in determining the I2C bit rate during the initialization process of MSSP module in I2C mode?
[A]
SSPADD
[B]
SSPBUF
[C]
Both a & b
[D]
None of the above
(13)
What should be the value of SSPM3:SSPM0 bits so that SPI can enter the slave mode by enabling SS pin control?
[A]
0000
[B]
0100
[C]
0010
[D]
0001
(14)
Which bit of SSPCON must be necessarily set so as to enable the synchronization of serial port?
[A]
WCOL
[B]
SSPOV
[C]
CKP
[D]
SSPEN
(15)
Which among the below stated conditions are selected by the SSPCON & SSPSTAT control bits?
[A]
Slave Select mode in slave mode
[B]
Data input sample phase
[C]
Clock Rate in master mode
[D]
All of the above
(16)
Which among the below stated components should be filtered for determining the cut-off frequency corresponding to the PW period of low-pass filter?
[A]
Fundamental FPWM & higher harmonics
[B]
Resonant FPWM & higher harmonics
[C]
Slowly Varying DC components
[D]
Slowly Varying AC components
Answer: Fundamental FPWM & higher harmonics
(17)
How do the variations in an average value get affected by PWM period?
[A]
Longer the PWM period, faster will be the variation in an average value
[B]
Shorter the PWM period, faster will be the variation in an average value
[C]
Shorter the PWM period, slower will be the variation in an average value
[D]
Longer the PWM period, slower will be the variation in an average value
Answer: Shorter the PWM period, faster will be the variation in an average value
(18)
What would be the resolution value if oscillator and PWM frequencies are 16MHz and 2 MHz respectively?
(19)
Why are the pulse width modulated outputs required in most of the applications?
[A]
To control average value of an input variables
[B]
To control average value of output variables
[C]
Both a & b
[D]
None of the above
Answer: To control average value of output variables
(20)
Where does the comparison level occur for 16-bit contents in the compare mode operation?
[A]
Between CCPR1 register & TMR1
[B]
Between CCPR1 & CCPR2 registers
[C]
Between CCPR2 register & TMR1
[D]
Between CCPR2 register & TMR0
Answer: Between CCPR1 register & TMR1
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