MCQs

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Overall MCQs for Reference

The most common method of connecting input/output devices to a server using a single communication line is:
a. Serial connectivity
b. Parallel connectivity
c. Local connectivity
d. None of the above
Answer: a. Serial connectivityautomationcommunity+1
Which register is used in an 8051 microcontroller for serial communication?
a. TMOD
b. TCON
c. SBUF
d. P0
Answer: c. SBUFtestbook
What is the fundamental difference between serial and parallel connectivity?
a. Serial sends data one bit at a time; parallel sends multiple bits
b. Serial is faster than parallel
c. Parallel uses fewer wires
d. There is no difference
Answer: a. Serial sends data one bit at a time; parallel sends multiple bitsautomationcommunity
Which standard is a widely used serial interface for communication with modems?
a. RS-232
b. SCSI
c. PCI
d. SATA
Answer: a. RS-232scribd
Which of the following is a pin-efficient communication method in embedded systems?
a. Serial port
b. Parallel port
c. Port mapping
d. GPIO only
Answer: a. Serial portsanfoundry
In serial communication, the speed of transmission is often measured as:
a. Latency
b. Throughput
c. Baud rate
d. Transfer rate only
Answer: c. Baud ratesanfoundry+1
Which buffer is used in serial ports to avoid data loss during fast transmission?
a. LIFO
b. FIFO
c. FILO
d. Random buffer
Answer: b. FIFOsanfoundry
Which type of communication is preferred over long distances?
a. Parallel communication
b. Serial communication
c. Wireless communication
d. Infrared
Answer: b. Serial communicationinstrumentationtools+1
The RS-485 standard is primarily used for:
a. Unbalanced transmission
b. Single-ended interfaces
c. Balanced digital transmission in industrial control
d. Video display
Answer: c. Balanced digital transmission in industrial controlautomationcommunity
Which port is a universal interface for computers and peripherals that supports both serial and parallel communication forms?
a. USB
b. VGA
c. HDMI
d. PS/2
Answer: a. USBtestbook
What is ‘full-duplex’ serial transmission?
a. Data flows both ways simultaneously
b. Data flows only one way
c. Uses two connectors
d. Data flow is always bidirectional but only one at a time
Answer: a. Data flows both ways simultaneouslysanfoundry+1
Which protocol is often used with serial communication in SCADA systems?
a. HTTP
b. FTP
c. Modbus
d. DHCP
Answer: c. Modbusautomationcommunity
What is the main advantage of serial connectivity over parallel connectivity?
a. Less crosstalk and interference
b. Higher cost
c. Uses more cabling
d. Greater data throughput
Answer: a. Less crosstalk and interferenceinstrumentationtools+1
The RS-232 standard supports a cable length of up to:
a. 15 meters
b. 30 meters
c. 50 meters
d. 100 meters
Answer: a. 15 metersinstrumentationtools
Which register controls the serial port operation in the 8051 microcontroller?
a. PCON
b. SCON
c. TMOD
d. TCON
Answer: b. SCONtestbook
Serial communication is generally:
a. Cheaper than parallel communication
b. More expensive
c. Larger in size
d. Only for short range
Answer: a. Cheaper than parallel communicationtestbook+1
A null-modem connection is used to:
a. Connect two computers using serial ports
b. Connect computer to modem
c. Increase cable length
d. Provide wireless link
Answer: a. Connect two computers using serial portsautomationcommunity
Which type of serial transmission uses start and stop bits for synchronization?
a. Synchronous
b. Asynchronous
c. Isochronous
d. Parallel
Answer: b. Asynchronoussanfoundry+1
Serial over IP refers to:
a. Encapsulating serial data in IP packets
b. Wireless serial connections
c. Serial via Bluetooth only
d. Serial ports on same motherboard
Answer: a. Encapsulating serial data in IP packetsautomationcommunity
The function of a serial hub is to:
a. Connect multiple serial devices to a single port
b. Change parallel to serial
c. Amplify signals
d. Route serial data wirelessly
Answer: a. Connect multiple serial devices to a single portautomationcommunity
What does ‘serial tunneling’ achieve?
a. Transmits serial data over a network
b. Encrypts serial data
c. Provides wireless serial access
d. Combines two parallel ports
Answer: a. Transmits serial data over a networkautomationcommunity
Which port uses DB9 or DB25 connectors for serial communication?
a. RS-232
b. USB
c. HDMI
d. VGA
Answer: a. RS-232scribd+1
The main purpose of handshaking lines in serial communication is:
a. Synchronization of data flow
b. Sending power
c. Video transmission
d. Amplifying signals
Answer: a. Synchronization of data flowinstrumentationtools
What is a common baud rate for modern serial connections?
a. 10
b. 9600
c. 10000
d. 5000
Answer: b. 9600instrumentationtools
In the 8051 architecture, which register is both transmit and receive buffer?
a. TMOD
b. SCON
c. SBUF
d. P1
Answer: c. SBUFtestbook
The common cable used for serial communication is:
a. Twisted pair
b. Coaxial
c. Fiber optic
d. Parallel wire
Answer: a. Twisted pairinstrumentationtools
SPI stands for:
a. Serial Peripheral Interface
b. System Port Interface
c. Synchronous Parallel Interface
d. Serial Parallel Integration
Answer: a. Serial Peripheral Interfacesanfoundry
What does ‘parity bit’ in serial transmission provide?
a. Error detection
b. Faster transmission
c. Encryption
d. Flow control
Answer: a. Error detectionscribd
Which parameter must be the same for both sender and receiver in serial communication?
a. Baud rate
b. Cable type
c. OS version
d. Power supply
Answer: a. Baud ratesanfoundry+1
The device converting data from parallel-to-serial and back in computers is:
a. Shift register
b. Buffer
c. Multiplexer
d. Counter
Answer: a. Shift registersanfoundry+1
When does the transmission unit not require processor assistance after a byte is written for transmission?
a. When SBUF register is used
b. When TMOD is set
c. When internal timer is disabled
d. When power is saved
Answer: a. When SBUF register is usedsanfoundry+1
Serial to WiFi adapters are used to:
a. Connect serial devices over WiFi networks
b. Encrypt data
c. Boost serial cable strength
d. Test serial lines
Answer: a. Connect serial devices over WiFi networksautomationcommunity
Double buffering in serial communication is used for:
a. Extending buffer capacity
b. Increasing ports
c. Reducing baud rate
d. Multiplying interfaces
Answer: a. Extending buffer capacitysanfoundry
The function of the SCON register is:
a. Control serial port operation
b. Provide baud rate to processor
c. Store instructions
d. Regulate system clock
Answer: a. Control serial port operationtestbook
RS-422 is primarily used for:
a. Differential serial interfaces
b. 10 Gigabit Ethernet
c. Motherboard buses
d. Internal computer timing
Answer: a. Differential serial interfacesinstrumentationtools
In the 8051 microcontroller, the serial port can operate in:
a. Four modes
b. One mode
c. Two modes
d. Three modes
Answer: a. Four modestestbook
Serial data communication very often transmits:
a. ASCII characters
b. Video data
c. Vector graphics
d. Audio signals only
Answer: a. ASCII charactersinstrumentationtools
The RS-485 standard allows a maximum cable length of:
a. 1200 meters
b. 100 meters
c. 10 meters
d. 15 meters
Answer: a. 1200 metersinstrumentationtools
Main limitation of serial communication is:
a. Lower data transfer rate compared to parallel
b. Expensive hardware
c. Complex wiring
d. Poor support
Answer: a. Lower data transfer rate compared to parallelsanfoundry+1
Which device is commonly used for serial-to-parallel data conversion in microcontrollers?
a. Shift register
b. Amplifier
c. Diode
d. Sensor
Answer: a. Shift registersanfoundry
Which serial standard is most used for multi-drop connections in industrial networks?
a. RS-485
b. RS-232
c. USB
d. PCIe
Answer: a. RS-485automationcommunity+1
How many bits are usually in a serial frame with parity?
a. 8 or 9
b. 4
c. 6
d. 11
Answer: a. 8 or 9instrumentationtools
Which of the following defines the number of bits transmitted or received per second?
a. Baud rate
b. Transfer function
c. Register speed
d. Buffer width
Answer: a. Baud ratesanfoundry+1
Which protocol allows serial communication between a server and many terminal devices with unique addresses?
a. Modbus
b. WPA
c. TCP
d. UDP
Answer: a. Modbusautomationcommunity
Why is serial communication preferred over parallel for longer distances?
a. Reduced data skew and crosstalk
b. More conductors
c. Higher voltage
d. Complex connectors
Answer: a. Reduced data skew and crosstalksanfoundry+1
Which feature differentiates synchronous from asynchronous serial transmission?
a. Requires a common clock
b. Uses USB only
c. Needs parity
d. Data sent in Ethernet packets
Answer: a. Requires a common clocksanfoundry
What is the maximum data rate for RS-232 under ideal conditions?
a. 115.2 Kbps
b. 1 Mbps
c. 9600 bps
d. 10 Mbps
Answer: a. 115.2 Kbpsinstrumentationtools
The SBUF register in 8051 is:
a. 8-bit
b. 16-bit
c. 32-bit
d. 4-bit
Answer: a. 8-bittestbook
What is essential for two ports to communicate via serial link successfully?
a. Matching baud rate, data bits, stop bits, and parity
b. Matching physical size
c. Same power supply
d. Same software
Answer: a. Matching baud rate, data bits, stop bits, and paritysanfoundry+1
A serial buffer is used to:
a. Hold data temporarily during serial transfer
b. Encrypt serial data
c. Stabilize voltage
d. Combine data from both serial and parallel ports
Answer: a. Hold data temporarily during serial transfersanfoundry+1

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