Embedded System Peripheral MCQ Quiz – Objective Question with Answer for Embedded System Peripheral

91. Which can prevent the terminal of data transmission?

A. flow control
B. increasing flow
C. increasing count
D. terminal count

Answer: A

The flow control can prevent a data transmission. It can also prevent the computer from sending more data than the other can cope with.

 

92. Which of the following is the first flow control method?

A. software handshaking
B. hardware handshaking
C. UART
D. SPI

Answer: B

The first flow control method is the hardware handshaking in which the hardware in the UART detects the potential overrun and it will assert a handshake line to tell the other UART to stop the transmission.

 

93. Which one of the following is the second method for flow control?

A. hardware
B. peripheral
C. software
D. memory

Answer: C

In the first method of flow control, there is a chance of data loss. So the second method of flow control is adopted which uses software to send characters XON and XOFF. XOFF can stop the data transfer and XON can restart the data transfer.

 

94. Which can restart the data transmission?

A. XON
B. XOFF
C. XRST
D. restart button

Answer: A

The second method of flow control is called software which is based on certain characters called XON and XOFF. XOFF can stop the data transfer and XON can restart the data transfer.

 

95. Which of the following is a common connector?

A. UART
B. SPI
C. I2C
D. DB-25

Answer: D

There are two connectors that are used very commonly. They are DB-25 and DB-9 which have 25 pins and 9 pins respectively.

 

96. What does pin 22 in DB-25 indicate?

A. transmit data
B. receive data
C. ring indicator
D. signal ground

Answer: C

The 22nd pin in DB-25 and the 9th pin in the DB-9 indicate a ring indicator which is asserted when a connected modem has detected an incoming call.

 

97. Which pin indicates the DSR in DB-25?

A. 1
B. 2
C. 4
D. 6

Answer: D

The 6th pin in DB-25 indicates DSR, that is, data set ready which indicates that each side is powered on and is ready to access data.

 

98. Which of the following connections are one-to-one?

A. Modem cables
B. SPI
C. UART
D. I2C

Answer: A

The modem cables are straight cables that allow one-to-one connections without crossover.

 

99. Which of the following are used to link PCs?

A. modem cable
B. null-modem cable
C. serial port
D. parallel port

Answer: B

The modem cables are used to link the PC with other peripherals like printers, plotters, modems, etc. But it cannot link with other PCs. So an alternative method is adopted to link PCs which is called null-modem cable.

 

100. Which of the following method is used by Apple Macintosh?

A. hardware handshaking
B. software handshaking
C. no handshaking
D. null-modem cable

Answer: B

The Apple Macintosh and UNIX use software handshaking for the data transmission where the characters are sent to control the flow of characters between two systems.

 

101. Which of the following provides an efficient method for transferring data from a peripheral to memory?

A. DMA controller
B. serial port
C. parallel port
D. dual port

Answer: A

The DMA controller or direct memory access controller provides an efficient method for transferring data from the peripheral to the memory.

 

102. Which of the following can be adopted for the systems which do not contain a DMA controller for data transmission?

A. counter
B. timer
C. polling
D. memory

Answer: C

The polling and interrupt help for data transmission for the systems which do not have a DMA controller.

 

103. Which of the following have low-level buffer filling?

A. output
B. peripheral
C. DMA controller
D. input

Answer: C

The DMA controller can initiate and control the bus access between I/O devices and memory, and also between two different memory areas. Therefore, the DMA controller can act as a hardware implementation of low-level buffer filling or emptying the interrupt.

 

104. How many classifications of DMA controllers are made based on the addressing capability?

A. 2
B. 3
C. 4
D. 5

Answer: B

There are three classifications for the DMA controllers based on the address capability. These are 1D, 2D, and 3D.

 

105. How many address registers are there for the 1D type DMA controller?

A. 1
B. 2
C. 3
D. 4

Answer: A

The 1D controller only has a single address register whereas the 2D controller has two address register and the 3D controller have three or more address register.

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