Microprocessor Mock Test 3

10%

Question 1 of 10

1. The function, 'data bus tristated' is performed when

CS(active low) = 1 OR CS(active low) = 0, RD(active low) = 1, WR(active low) = 1

CS(active low) = 0, RD(active low) = 1, WR(active low) = 1

CS(active low) = 1

CS(active low) = 0

Question 1 of 10

Question 2 of 10

2. If A1=0, A0=1 then the input read cycle is performed from

port C to data bus

port A to data bus

port B to data bus

CWR to data bus

Question 2 of 10

Question 3 of 10

3. The Isolation transformers are generally used for

protecting low power circuit and isolation

none

isolation

protecting low power circuit

Question 3 of 10

Question 4 of 10

4. The strobed input/output mode is another name of

mode 0

mode 1

mode 2

none

Question 4 of 10

Question 5 of 10

5. The FIFO status word is used to indicate the error in

strobed input mode

keyboard and strobed input mode

keyboard mode

scanned sensor matrix mode

Question 5 of 10

Question 6 of 10

6. When a key is pressed, a debounce logic comes into operation in

scanned keyboard mode with 2 key lockout

sensor matrix mode

scanned keyboard special error mode

scanned keyboard with N-key rollover

Question 6 of 10

Question 7 of 10

7. Which of the following is not one of the phases of the total conversion cycle?

autozero phase

conversion phase

disintegrate phase

signal integrate phase

Question 7 of 10

Question 8 of 10

8. If the data transmission takes place in either direction, but at a time data may be transmitted only in one direction then, it is of

duplex mode

half duplex mode

semi duplex mode

simplex mode

Question 8 of 10

Question 9 of 10

9. The priority between the DMA channels requesting the services can be resolved by

timing and control block

none of the mentioned

program command control block

priority block

Question 9 of 10

Question 10 of 10

10. In 8251A, the pin that controls the rate at which the character is to be transmitted is

TXD(active low)

TXC(active high)

RXC(active low)

TXC(active low)

Question 10 of 10