MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your 8051 Microcontroller knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
WHAT_IS_THE_FUNCTION_OF_THE_SCON_REGISTER??$ |
| A. | to control SBUF and SMOD registers |
| B. | to program the start bit, stop bit, and data bits of framing |
| C. | to control SMOD registers |
| D. | none of the mentioned |
| Answer» C. to control SMOD registers | |
| 2. |
What_should_be_done_if_we_want_to_double_the_baud_rate?$ |
| A. | change a bit of the TMOD register |
| B. | change a bit of the PCON register |
| C. | change a bit of the SCON register |
| D. | change a bit of the SBUF register |
| Answer» C. change a bit of the SCON register | |
| 3. |
With what frequency UART operates( where f denoted the crystal frequency )? |
| A. | f/12 |
| B. | f/32 |
| C. | f/144 |
| D. | f/384 |
| Answer» E. | |
| 4. |
Which of the following best states the reason that why baud rate is mentioned in serial communication? |
| A. | to know about the no of bits being transmitted per second |
| B. | to make the two devices compatible with each other, so that the transmission becomes easy and error free |
| C. | to use Timer 1 |
| D. | for wasting memory |
| Answer» C. to use Timer 1 | |
| 5. |
What is a null modem connection? |
| A. | no data transmission |
| B. | no MAX232 |
| C. | the RxD of one is the TxD for the other |
| D. | no serial communication |
| Answer» D. no serial communication | |
| 6. |
Which of the following is the logic level understood by the micro-controller/micro-processor? |
| A. | TTL logic level |
| B. | RS232 logic level |
| C. | None of the mentioned |
| D. | TTL & RS232 logic level |
| Answer» B. RS232 logic level | |
| 7. |
Which of the following signal control the flow of data? |
| A. | RTS |
| B. | DTR |
| C. | RTS & DTR |
| D. | None of the mentioned |
| Answer» B. DTR | |
| 8. |
Which of the following best describes the use of framing in asynchronous means of communication? |
| A. | it binds the data properly |
| B. | it tells us about the start and stops of the data to be transmitted or received |
| C. | it is used for error checking |
| D. | it is used for flow control |
| Answer» C. it is used for error checking | |
| 9. |
What is the difference between UART and USART communication? |
| A. | they are the names of the same particular thing, just the difference of A and S is there in it |
| B. | one uses asynchronous means of communication and the other uses synchronous means of communication |
| C. | one uses asynchronous means of communication and the other uses asynchronous and synchronous means of communication |
| D. | one uses angular means of the communication and the other uses linear means of communication |
| Answer» D. one uses angular means of the communication and the other uses linear means of communication | |
| 10. |
Which devices are specifically being used for converting serial to parallel and from parallel to serial respectively? |
| A. | timers |
| B. | counters |
| C. | registers |
| D. | serial communication |
| Answer» D. serial communication | |