Input Output interfacing Questions

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11.

The device that enables the microprocessor to read data from the external devices is

A

printer

B

joystick

C

display

D

reader

Correct Answer: B

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12.

The example of output device is

A

CRT display

B

7-segment display

C

Printer

D

All of the mentioned

Correct Answer: D

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13.

The input and output operations are respectively similar to the operations,

A

read, read

B

write, write

C

read, writ

D

write, read

Correct Answer: C

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14.

The operation, IOWR (active low) performs

A

write operation on input data

B

write operation on output data

C

read operation on input data

D

read operation on output data

Correct Answer: B

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15.

The latch or IC 74LS373 acts as

A

good input port

B

bad input port

C

good output port

D

bad output port

Correct Answer: C

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16.

While performing read operation, one must take care that much current should not be

A

sourced from data lines

B

sinked from data lines

C

sourced or sinked from data lines

D

sinked from address lines

Correct Answer: C

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17.

To avoid loading during read operation, the device used is

A

latch

B

flipflop

C

buffer

D

tristate buffer

Correct Answer: D

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18.

The chip 74LS245 is

A

bidirectional buffer

B

8-bit input port

C

one that has 8 buffers

D

all of the mentioned

Correct Answer: D

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19.

In 74LS245, if DIR is 1, then the direction is from

A

inputs to outputs

B

outputs to inputs

C

source to sink

D

sink to source

Correct Answer: A

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20.

In memory-mapped scheme, the devices are viewed as

A

distinct I/O devices

B

memory locations

C

only input devices

D

only output devices

Correct Answer: B

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