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90+ Microprocessor and Interfacing Technique Solved MCQs

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Computer Science Engineering (CSE) .

1.

for i/o of 8255,if -----, the word is taken as a bit set/rest word

A. d7=1
B. d7=0
C. d0=1
D. d0=0
Answer» B. d7=0
2.

on activation of ----, 8255 loads data from the input port lines into the input buffer of that port

A. stb#
B. ibf
C. obf#
D. none of these
Answer» B. ibf
3.

8255 has three ----parrallel port

A. 8bit
B. 16bit
C. 32bit
D. 64bit
Answer» A. 8bit
4.

in ----, bidirectional data transfer is possible

A. mode 0
B. mode1
C. mode2
D. bsr
Answer» C. mode2
5.

walkie-talkie is an example of …..serial communication

A. simplex
B. half duplex
C. full duplex
D. none of these
Answer» B. half duplex
6.

Transmission through telephone lines is an example of….serial commuincation

A. simplex
B. half duplex
C. full duplex
D. none of these
Answer» C. full duplex
7.

Asynchronous serial communication involves

A. start bit
B. stop bits
C. character data
D. all of these
Answer» D. all of these
8.

to configure 8255 with port A output,Port B input port C lower output and port C upper input

A. mov al,0afh
B. mov al,0aeh
C. mov al,0ceh
D. mov a,0aah
Answer» B. mov al,0aeh
9.

A high on ---line indicates that the buffer register is empty

A. txrdy
B. txe
C. txc#
D. both b and c
Answer» B. txe
10.

Adc 0808 uses ----technique

A. successive apraximation
B. single step
C. dual slope
D. flash converter
Answer» A. successive apraximation
11.

the signals provided by ADC are

A. soc
B. eoc
C. ale
D. all of these
Answer» D. all of these
12.

Flash ADC consist of….converters

A. 2^n
B. 2^n -1
C. 2^n +1
D. none of these
Answer» B. 2^n -1
13.

8253/54 has ----independent timers/counters

A. 1
B. 2
C. 3
D. 4
Answer» C. 3
14.

8253/54 timers can be programmed in---modes

A. 1
B. 3
C. 6
D. 5
Answer» C. 6
15.

in mode 0 of 8253/54 ----disables counting

A. gate=1
B. gate=0
C. wr#=1
D. wr#=0
Answer» B. gate=0
16.

8253/54 has c----command that allows the user to check the count value programmed mode and current status of the counter

A. write back
B. write ahead
C. read ahead
D. read back
Answer» D. read back
17.

for mode 3 of 8253/54, if the count is odd the output will be high for---

A. 2/(n+1)
B. (n+1)/2
C. 2/(n-1)
D. (n-1)/2
Answer» B. (n+1)/2
18.

EOC means

A. end of conversion
B. enable output conversion
C. error of conversion
D. none of these
Answer» A. end of conversion
19.

ADC 0808 is ----- pin IC

A. 40
B. 20
C. 24
D. 28
Answer» D. 28
20.

ADC 0808 operates on single ---- power supply

A. 5v
B. 10v
C. 15v
D. 20v
Answer» A. 5v
21.

8255 has -------- i/o pins

A. 28
B. 26
C. 24
D. 22
Answer» C. 24
22.

8255 has three ----parallel ports

A. 8 bit
B. 16 bit
C. 32 bit
D. 64 bit
Answer» A. 8 bit
23.

In 8255 ,BSR means -----

A. bit set/reset
B. byteset/reset
C. binary set/reset
D. none
Answer» A. bit set/reset
24.

BSR mode is used to set or reset the bitsin

A. porta
B. portb
C. portc
D. portd
Answer» C. portc
25.

8255 has ----i/o modes

A. 2
B. 3
C. 4
D. 8
Answer» B. 3
26.

A high on ----pin causes all 24 lines of three 8 bit ports to be in the input mode

A. wr\
B. reset
C. gnd
D. vcc
Answer» B. reset
27.

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
Answer» A. d7=1
28.

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
Answer» B. d7=0
29.

On activation of --------,8255 loads data from the input port lines into the input buffer of that port

A. stb\
B. ibf
C. obf\
D. none
Answer» B. ibf
30.

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

A. high
B. low
C. enable
D. disable
Answer» A. high
31.

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
Answer» C. 1,1,1
32.

Upon activation of------ signal,output device reads data from output port and acknowledges it

A. intr
B. ack\
C. obf\
D. ibf
Answer» C. obf\
33.

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

A. mode0
B. mode1
C. mode2
D. bsr mode
Answer» C. mode2
34.

Walkie-talkie is an example of serial communication

A. simplex
B. half-duplex
C. full-duplex
D. none
Answer» B. half-duplex
35.

Asynchronous serial communication involves transmission of

A. start bit
B. stop bit
C. character data
D. all
Answer» D. all
36.

Whichof the following is the fastest ADC

A. dual slope
B. successive approximation
C. flash
D. single slope
Answer» C. flash
37.

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

A. eoc
B. soc
C. clk
D. output control
Answer» A. eoc
38.

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)
Answer» B. t(n+1)
39.

Conversion time of ADC 0808 IS

A. 100 ms
B. 100micro sec
C. 100 ms
D. 100ns
Answer» B. 100micro sec
40.

ADC 0809 IS A ----- PIN IC

A. 40
B. 20
C. 24
D. 28
Answer» D. 28
41.

Which is 16 Bit microprocessor:

A. 8088
B. 8086
C. 8085
D. all of these
Answer» D. all of these
42.

How many speed of 8088,8085,8086 microprocessor:

A. 2.5 million instruction per second
B. 1.5 million instruction per second
C. 3.5 million instruction per second
D. 1.6 million instruction per second
Answer» A. 2.5 million instruction per second
43.

Which processor provided 1 MB memory:

A. 16-bit 8086 and 8088
B. 32-bit 8086 and 8088
C. 64-bit 8086 and 8088
D. 8-bit 8086 and 8088
Answer» A. 16-bit 8086 and 8088
44.

The stack pointer in the microprocessor is a

A. 16 bit register that point to stack
B. 32 bit accumulator
C. memory location in the stack
D. flag register used for the stack
Answer» A. 16 bit register that point to stack
45.

The register which holds the address of the location to or from which data are to be transferred is called

A. index register
B. instruction register
C. memory address register
D. memory data register
Answer» C. memory address register
46.

The register which contains the data to be written into or read out of the addressed location is called

A. memory address register
B. memory data register
C. program counter
D. index register
Answer» B. memory data register
47.

Which of the following is used as storage locations both in the ALU and the control section of a computer ?

A. accumulator
B. register
C. adder
D. decoder
Answer» B. register
48.

The register used as a working area in CPU is

A. program counter
B. instruction register
C. instruction decoder
D. accumulator
Answer» D. accumulator
49.

The device which is used to connect a peripheral to bus is called

A. control register
B. interface
C. communicatio n protocol
D. none of these
Answer» B. interface
50.

Which of the following is a set of general purpose internal registers ?

A. stack
B. scratch pad
C. address register
D. status register
Answer» B. scratch pad

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