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UART Question & Answers

July 26, 2021 By WatElectronics

This article lists 100 UART MCQs for engineering students. All the UART Questions & Answers given below includes solution and link wherever possible to the relevant topic.

A UART stands for Universal Asynchronous Receiver Transmitter. As the name suggests, it is an asynchronous type of communication protocol. When two devices need to communicate with each other, there need to be at least two connections between them, one is a transmission line and another one is a reception line for each device.

A UART uses two wires between transmitter and receiver, and the UART frame consists of data, start/stop, and parity bits. The control, status, transmit, and receive registers are the UART registers. The control register contains settings for the UART, and the status register contains information about the UART state or condition.

The Transmit Data Register Empty is a type of UART flag and the Serial Communication Status Register is a type of UART register. The UART is a widely used method, it uses only two wires, whereas the clock signal is not necessary. The disadvantages of a UART are it doesn’t support multiple slaves, and the data frame size is limited to a 9 bits max.

In UART the data is transmitted in the form of bytes, its maximum speed is 115.2Kbps, and its data rate is 20Kbps. The transmitter section of a UART consists of a transmitter shift register and transmitter hold register. The Bluetooth modules, GPS units, microcontrollers, etc are the applications of a UART.

1). How many wires does UART use?
HintUART uses two wires between transmitter and receiver
2). The UART frame consists of ___________ bits
HintThe UART frame consists of data, start/stop, and parity bits
3). Which bit is used for error detection?
HintThe parity bit is used for error detection
4). In which parity the number of 1’s must be even?
HintIn even parity the number of 1’s must be even
5). ____________ are the UART registers
HintThe control, status, transmit and receive registers are the UART registers
6). Which one of the following registers contains settings for the UART?
HintThe control register contains settings for the UART
7). Which one of the following registers contains information about the UART state or condition?
HintThe status register contains information about the UART state or condition
8). The universal asynchronous receiver transmitter can be _____________
HintThe universal asynchronous receiver transmitter can be simplex, full-duplex, and half-duplex
9). In which parity the number of 1’s must be odd?
HintIn odd parity, the number of 1’s must be odd
10). The number of bits sent every second is known as ________ rate
HintThe number of bits sent every second is known as the bit rate
11). The number of symbols sent every second is known as ________ rate
HintThe number of symbols sent every second is known as the baud rate
12). Which one is a type of UART flag?
HintThe TDRE is a type of UART flag
13). Which one is a type of UART register?
HintThe SCSR is a type of UART register
14). What is the standard form of TDRE?
HintThe standard form of TDRE is Transmit Data Register Empty, it is one type of UART flag
15). ____________ is an example for data communication equipment
HintThe modem is an example of data communication equipment
16). What is the standard form of DTE?
HintThe standard form of DTE is Data Terminal Equipment
17). What is the standard form of RDRF?
HintThe standard form of RDRF is Receiver Data Register Full
18). ____________ is an example for data terminal equipment
HintThe computer and terminal both are the examples for data terminal equipment
19). What is the standard form of DCE?
HintThe standard form of DCE is Data Communication Equipment
20). What are the advantages of UART?
HintThe UART is a widely used method, it uses only two wires, and the clock signal is not necessary for UART
21). What is the standard form of RDR?
HintThe standard form of RDR is Receiver Data Register, it is a type of UART register
22). What are the disadvantages of UART?
HintThe disadvantages of a UART are it doesn’t support multiple slaves, and the data frame size is limited to a 9 bits max
23). What is the function of the UARTn_TXD signal?
HintThe function of the UARTn_TXD signal is serial data transmit-receive
24). The transmitter section of an UART consists of __________
HintThe transmitter section of a UART consists of transmitter shift register and transmitter hold register
25). What is the standard form of RSR?
HintThe standard form of RSR is Receive Shift Register

UART MCQ's with Answers

26). What is the function of UARTn_RTX?
HintThe function of UARTn_RTX is Serial data receive
27). Which one of the following was used to enable or disable the interrupt request?
HintThe IER is used to enable or disable the interrupt request
28). Which one of the following is a write-only register?
HintThe FIFO control register is a write-only register
29). What is the standard form of TDR?
HintThe standard form of TDR is Transmit Data Register
30). Which one of the following is a divisor latch?
HintBoth DLH and DLL are the divisor latches
31). The baud rate of 8-bit UART is ___________
HintThe baud rate of 8-bit UART is 9600bps
32). In 8-bit UART 1 byte is equal to ____________ bits
HintIn 8-bit UART 1 byte is equal to eight bits
33). The bits transferred per second is _______ in 8-bit UART
HintThe bits transferred per second is 8,192 in 8-bit UART
34). The data in a UART is detected by __________
HintThe data in a UART is detected by clock
Read more about UART 
35). What is the standard form of TSR?
HintThe standard form of TSR is Transmit Shift Register
36). The baud rate of 16 bit UART is ___________
HintThe baud rate of 16 bit UART is 9600bps
37). In 16-bit UART 1 byte is equal to ____________ bits
HintIn 16-bit UART 1 byte is equal to 16 bits
38). The bits transferred per second is ______ in 16 bit UART
HintThe bits transferred per second is 16,384 in 16 bit UART
39). Which register does UART contain?
HintA universal asynchronous receiver transmitter contains a shift register
40). What is the standard form of SCCR?
HintThe standard form of SCCR is Serial Communication Control Register, it is a type of UART register
41). _________ are the handshaking signals
HintThe RI, DCD, CTS, DSR, RTS, DTR are the handshaking signals
42).The MSP430 family operates in _________ mode
HintThe MSP430 family operates in both synchronous and asynchronous mode
43). What is the standard form of SCSR?
HintThe standard form of SCSR is Serial Communication Status Register
44). The speed of the UART is ________ compare to USART
HintThe speed of the UART is less compare to USART
45). Which one of the following uses data signal for its functioning?
HintUART uses data signals for its functioning
46). In which one of the following the data is transmitted in the form of bytes?
HintIn UART the data is transmitted in the form of bytes
47). What is the standard form of UDR?
HintThe standard form of UDR is UART Data Register
48). Which one of the following is an SPI register?
HintThe SPDR, SPCR, SPSR are the SPI registers
49). The transmitter type of LIN is ____________
HintThe transmitter type of LIN is asynchronous
50). The data rate of a UART is __________
HintThe data rate of a UART is 20Kbps

UART Interview Questions and Answers

51). The data rate of an SPI is __________
HintThe data rate of an SPI is 25Mbps
52). Which one of the following scalability is low?
HintIn UART the scalability is low
53). What is the standard form of USR?
HintThe standard form of USR is UART Status Register
54). The transmitter type of SPI is __________
HintThe transmitter type of SPI is synchronous
55). The data rate of I2C is ___________
HintThe data rate of I2C is 1Mbps
56). Which one of the following scalability is high?
HintThe I2C scalability is high compare to UART and SPI
57). What is the standard form of UBRR?
HintThe standard form of UBRR is UART Baud Rate Register
58). The maximum speed of a UART is ___________
HintThe maximum speed of a UART is 115.2Kbps
59). The maximum speed of an SPI is ___________
HintThe maximum speed of an SPI is 4Mbps
60). What is the standard form of UCR?
HintThe standard form of UCR is UART Control Register
61). The transmitter type of I2C is _______
HintThe transmitter type of I2C is synchronous
62). The maximum speed of I2C is ___________
HintThe maximum speed of I2C is 1Mbps
63). The maximum distance of a UART is ___________
HintThe maximum distance of a UART is 15m
64). In a UART, the maximum possible number of devices in a bus is ___________
HintIn a UART, the maximum possible number of devices in a bus is two
65). The associated protocol for serial interface RS-422 is ___________
HintThe associated protocol for serial interface RS-422 is UART
66). The master unit is ______ in UART
HintThe master unit is variable in UART
67). The maximum speed of RS-485 is ________
HintThe maximum speed of RS-485 is 115.2Kbps
68). The maximum distance of SPI is ___________
HintThe maximum distance of SPI is 0.1m
69). In SPI, the maximum possible number of devices in a bus is ___________
HintIn SPI, the maximum possible number of devices in a bus is virtually unlimited
70). The master unit is ______ in USB 2.0
HintThe master unit is fixed in USB 2.0
71). The speed of USB is ______
HintThe speed of USB is 12M bit/sec
72). The speed of SCSI is ______
HintThe speed of SCSI is 160M bytes/sec
73). The maximum distance of I2C is ____________
HintThe maximum distance of I2C is 0.5m
74). In I2C, the maximum possible number of devices in a bus is _________
HintIn I2C, the maximum possible number of devices in a bus is 127
75). The maximum throughput of RS 232 is _____________
HintThe maximum throughput of RS 232 is 28.8KB/sec
76). The product availability of RS-232 is _____________
HintThe product availability of RS-232 is greater than 10,000
77). The maximum distance of RS-485 is _________
HintThe maximum distance of RS-485 is 1.2km
78). The maximum throughput of an Ethernet is _____________
HintThe maximum throughput of an Ethernet is 125MB/sec
79). The maximum cable length of RS-232 is ___________
HintThe maximum cable length of RS-232 is 1.5km
80). The maximum cable length of USB is ______
HintThe maximum cable length of USB is 30km

UART MCQ's for Exams

81). What is the standard form of PCON?
HintThe standard form of PCON is Power Control Register
82). How many lines does I2C use between multiple slaves and multiple masters?
HintThe I2C uses two lines between multiple slaves and multiple masters
83). What is the standard form of UARTFR?
HintThe standard form of UARTFR is UART Flag Register
84). Which one of the following is a write-only register?
HintThe FCR is a write-only register
85). The UART transmitter consists of ___________
HintThe UART transmitter consists of a FIFO module, shift and hold registers
Read more about Shift Registers
86). An UART used for _______ access
HintAn UART used for both mainframe and internet access
87). What is the standard form of MCR?
HintThe standard form of MCR is Modem Control Register
88). __________ are the revision identification registers
HintThe REVID1 and REVID2 are the revision identification registers
89). What is the standard form of MDR?
HintThe standard form of MDR is Modem Definition Register
90). Which register contains the data to be transmitted?
HintThe THR register contains the data to be transmitted
91). Which register contains the data which is recently received?
HintThe RBR register contains the data which is recently received
92). Which register controls the universal asynchronous receiver transmitter frame formatting?
HintThe LCR register controls the universal asynchronous receiver transmitter frame formatting
93). What is the standard form of MSR?
HintThe standard form of MSR is Modem Status Register
94). Which register is used to disable/enable the transmission?
HintThe TER register is used to disable/enable the transmission
95). Which one of the following registers is a least significant byte of a universal asynchronous receiver transmitter baud rate generator value?
HintThe DLL register is a least significant byte of a universal asynchronous receiver transmitter baud rate generator value
96). Which one of the following registers is a most significant byte of a universal asynchronous receiver transmitter baud rate generator value?
HintThe DLM register is a most significant byte of a universal asynchronous receiver transmitter baud rate generator value
97). What is the standard form of UDRE?
HintThe standard form of UDRE is UART Data Register Empty
98). What are the applications of a UART?
HintThe Bluetooth modules, GPS units, microcontrollers, etc are the applications of a UART
99). What is the standard form of DUDRE?
HintThe standard form of DUDRE is Dual UART Data Register Empty, it combines two UART’s into a one chip
100).The UART 16550A has ____________FIFO buffers
HintThe UART 16550A has 16-byte FIFO buffers
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