Question 1

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

Accepted Answer

A

Question 2

For i/o mode of 8255 ,if -----, the word is taken as a bit set/reset word
A)D7=1
B)D7=0
C)D0=1
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
A)high
B)low
C)enable
D)disable

Accepted Answer

A

Question 4

8255 sets INTR when STB'=-----,IBF=---------,INTE=--------,for input conrol signals
A)1,0,1
B)1,1,0
C)1,1,1
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
A)mode0
B)mode1
C)mode2
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
A)simplex
B)half-duplex
C)full-duplex
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
A)start bit
B)stop bit
C)character data
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
A)DUAL SLOPE
B)successive approximation
C)flash
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
A)EOC
B)SOC
C)CLK
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
A)T(n-1)
B)T(n+1)
C)T(n)
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
A)100 ms
B)100micro sec
C)100 Ms
D)100ns

Accepted Answer

The conversion time of ADC 0808 is 100 microseconds. This is the time it takes for the ADC 0808 to convert an analog signal to a digital output.

Question 12

ADC 0809 IS A ----- PIN IC
A)40
B)20
C)24
D)28

Accepted Answer

The ADC0809 is a 28-pin IC.

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

For i/o mode of 8255,if -----,the word is taken as a mode definition word

For i/o mode of 8255 ,if -----, the word is taken as a bit set/reset word

IBF is an active-------- output signal for 8255

8255 sets INTR when STB'=-----,IBF=---------,INTE=--------,for input conrol signals

In ------ of 8255 ,bidirectionali/o data transfer is possible

Walkie-talkie is an example of serial communication

Asynchronous serial communication involves transmission of

Whichof the following is the fastest ADC

To indicate end of conversion ADC 0808/0809 ACTIVATES -----SIGNAL

Conversion time Tc of successive approximation ADC is given as

Conversion time of ADC 0808 IS

ADC 0809 IS A ----- PIN IC