Question 1

For i/o mode of 8255,if -----,the word is taken as a mode definition word&#10;A)D7=1&#10;B)D7=0&#10;C)D0=1&#10;D)D0=0

Accepted Answer

D7=1&#10;

Question 2

For i/o mode of 8255 ,if -----, the word is taken as a bit set/reset word&#10;A)D7=1&#10;B)D7=0&#10;C)D0=1&#10;D)D0=0

Accepted Answer

In the 8255 Programmable Peripheral Interface, if D7=0, the control word is interpreted as a bit set/reset word.

Question 3

IBF is an active-------- output signal for 8255&#10;A)high&#10;B)low&#10;C)enable&#10;D)disable

Accepted Answer

high&#10;

Question 4

8255 sets INTR when STB'=-----,IBF=---------,INTE=--------,for input conrol signals&#10;A)1,0,1&#10;B)1,1,0&#10;C)1,1,1&#10;D)0,1,1

Accepted Answer

8255 sets INTR (Interrupt Request) when STB' (Strobe input) is 1 (active low, so it's actually not active), IBF (Input Buffer Full) is 1 (indicating the input buffer is full), and INTE (Interrupt Enable) is 1 (indicating that interrupts are enabled).

Question 5

In ------ of 8255 ,bidirectionali/o data transfer is possible&#10;A)mode0&#10;B)mode1&#10;C)mode2&#10;D)BSR MODE

Accepted Answer

In mode 2 of the 8255 Programmable Peripheral Interface (PPI), bidirectional I/O data transfer is possible, specifically for port A. This mode supports both input and output operations in a two-way data transfer mechanism.

Question 6

Walkie-talkie is an example of serial communication&#10;A)simplex&#10;B)half-duplex&#10;C)full-duplex&#10;D)none

Accepted Answer

Walkie-talkies operate on a half-duplex channel, meaning they can send and receive signals but not simultaneously. One party speaks while the other listens, and they must take turns.

Question 7

Asynchronous serial communication involves transmission of&#10;A)start bit&#10;B)stop bit&#10;C)character data&#10;D)all

Accepted Answer

Asynchronous serial communication involves the transmission of start bits, stop bits, and character data to ensure proper synchronization between the sender and receiver without the need for a shared clock signal.

Question 8

Whichof the following is the fastest ADC&#10;A)DUAL SLOPE&#10;B)successive approximation&#10;C)flash&#10;D)single slope

Accepted Answer

Flash ADCs are the fastest type because they convert an analog signal to a digital signal in a single step, using a bank of comparators to compare the input signal with reference voltages simultaneously.

Question 9

To indicate end of conversion ADC 0808/0809 ACTIVATES -----SIGNAL&#10;A)EOC&#10;B)SOC&#10;C)CLK&#10;D)OUTPUT CONTROL

Accepted Answer

The ADC 0808/0809 activates the EOC (End Of Conversion) signal to indicate the end of a conversion process.

Question 10

Conversion time Tc of successive approximation ADC is given as&#10;A)T(n-1)&#10;B)T(n+1)&#10;C)T(n)&#10;D)T(n+2)

Accepted Answer

The conversion time $T_c$ of a successive approximation ADC is given by $T(n+1)$, where $n$ is the number of bits. This accounts for $n$ approximation steps plus one additional step for the final conversion.

Question 11

Conversion time of ADC 0808 IS&#10;A)100 ms&#10;B)100micro sec&#10;C)100 Ms&#10;D)100ns

Accepted Answer

The answer of Conversion time of ADC 0808 IS&#10;A)100 ms&#10;B)100micro...

Question 12

ADC 0809 IS A ----- PIN IC&#10;A)40&#10;B)20&#10;C)24&#10;D)28

Accepted Answer

The answer of ADC 0809 IS A ----- PIN IC&#10;A)40&#10;B)20&#10;C)24&#10;D)28...

Deck 2: I/O Mode and Communication in 8255 and ADCS