1. for i/o of 8255,if -----, the word is taken as a bit set/rest word
Correct : B. d7=0
2. on activation of ----, 8255 loads data from the input port lines into the input buffer of that port
Correct : B. ibf
3. 8255 has three ----parrallel port
Correct : A. 8bit
4. in ----, bidirectional data transfer is possible
Correct : C. mode2
5. walkie-talkie is an example of …..serial communication
Correct : B. half duplex
6. Transmission through telephone lines is an example of….serial commuincation
Correct : C. full duplex
7. Asynchronous serial communication involves
Correct : D. all of these
8. to configure 8255 with port A output,Port B input port C lower output and port C upper input
Correct : B. mov al,0aeh
9. A high on ---line indicates that the buffer register is empty
Correct : B. txe
10. Adc 0808 uses ----technique
Correct : A. successive apraximation
11. the signals provided by ADC are
Correct : D. all of these
12. Flash ADC consist of….converters
Correct : B. 2^n -1
13. 8253/54 has ----independent timers/counters
Correct : C. 3
14. 8253/54 timers can be programmed in---modes
Correct : C. 6
15. in mode 0 of 8253/54 ----disables counting
Correct : 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
Correct : D. read back
17. for mode 3 of 8253/54, if the count is odd the output will be high for---
Correct : B. (n+1)/2
18. EOC means
Correct : A. end of conversion
19. ADC 0808 is ----- pin IC
Correct : D. 28
20. ADC 0808 operates on single ---- power supply
Correct : A. 5v
21. 8255 has -------- i/o pins
Correct : C. 24
22. 8255 has three ----parallel ports
Correct : A. 8 bit
23. In 8255 ,BSR means -----
Correct : A. bit set/reset
24. BSR mode is used to set or reset the bitsin
Correct : C. portc
25. 8255 has ----i/o modes
Correct : B. 3
26. A high on ----pin causes all 24 lines of three 8 bit ports to be in the input mode
Correct : B. reset
27. For i/o mode of 8255,if -----,the word is taken as a mode definition word
Correct : A. d7=1
28. For i/o mode of 8255 ,if -----, the word is taken as a bit set/reset word
Correct : B. d7=0
29. On activation of --------,8255 loads data from the input port lines into the input buffer of that port
Correct : B. ibf
30. IBF is an active-------- output signal for 8255
Correct : A. high
31. 8255 sets INTR when STB'=-----,IBF=---------,INTE=--------,for input conrol signals
Correct : C. 1,1,1
32. Upon activation of------ signal,output device reads data from output port and acknowledges it
Correct : C. obf\
33. In ------ of 8255 ,bidirectionali/o data transfer is possible
Correct : C. mode2
34. Walkie-talkie is an example of serial communication
Correct : B. half-duplex
35. Asynchronous serial communication involves transmission of
Correct : D. all
36. Whichof the following is the fastest ADC
Correct : C. flash
37. To indicate end of conversion ADC 0808/0809 ACTIVATES -----SIGNAL
Correct : A. eoc
38. Conversion time Tc of successive approximation ADC is given as
Correct : B. t(n+1)
39. Conversion time of ADC 0808 IS
Correct : B. 100micro sec
40. ADC 0809 IS A ----- PIN IC
Correct : D. 28
41. Which is 16 Bit microprocessor:
Correct : D. all of these
42. How many speed of 8088,8085,8086 microprocessor:
Correct : A. 2.5 million instruction per second
43. Which processor provided 1 MB memory:
Correct : A. 16-bit 8086 and
8088
44. The stack pointer in the microprocessor is a
Correct : 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
Correct : C. memory address register
46. The register which contains the data to be written into or read out of the addressed location is called
Correct : 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 ?
Correct : B. register
48. The register used as a working area in CPU is
Correct : D. accumulator
49. The device which is used to connect a peripheral to bus is called
Correct : B. interface
50. Which of the following is a set of general purpose internal registers ?
Correct : B. scratch pad
51. Which of the following register is used in the control unit of the CPU to indicate the next instruction which is to be executed ?
Correct : D. program counter
52. Which of the following is not typically found in the status register of a micro processor ?
Correct : D. none of the above
53. The register which keeps track of the execution of a program and which contains the memory address of the instruction currently being executed is called
Correct : D. instruction register
54. Which of the following register holds the information before going to the memory ?
Correct : B. data register
55. Which of the following register is used in the control unit of the CPU to indicate the next instruction which is to be executed
Correct : D. program counter
56. In 8086 the following has the higest priority among all the interrupts
Correct : A. nmi
57. A set of register which contain
Correct : D. all of these
58. PC stands for:
Correct : A. program counter
59. SP stands for:
Correct : B. stack pointer
60. Causing a flag to became 0 is called:
Correct : A. clearing a flag
61. Which are the flags of status register:
Correct : D. all of these
62. executed:
Correct : A. instruction register
63. The subprogram finish the return instruction recovers the return address from the:
Correct : A. stack
64. The processor uses the stack to keep track of where the items are stored on it this by using the:
Correct : A. stack pointer register
65. Stack words on:
Correct : B. lifo
66. Which is the basic stack operation:
Correct : C. both a and b
67. SP stand for:
Correct : A. stack pointer
68. How many bit stored by status register:
Correct : A. 1 bit
69. The structure of the stack is type structure:
Correct : A. first in last out
70. The 16 bit register is separated into groups of 4 bit where each groups is called:
Correct : B. nibble
71. A 16 bit address bus can generate addresses:
Correct : C. 65536
72. The processor 80386/80486 and the Pentium processor uses bits address bus:
Correct : B. 32
73. CPU can read & write data by using :
Correct : B. data bus
74. Which bus transfer singles from the CPU to external device and others that carry singles from external device to th
Correct : A. control bus
75. Using 12 binary digits how many unique house addresses would be possible:
Correct : B. 212=4096
76. Each memory location has:
Correct : C. both a and b
77. 80386 has ---bit address bus?
Correct : C. 32
78. 80386 has – BIT data bus?
Correct : C. 32
79. Which flag are used to record specific characteristics of arithmetic and logical instructions:
Correct : C. the status
80. The size of each segment in 8086 is:
Correct : A. 64 kb
81. The pin configuration of 8086 is available in the :
Correct : A. 40 pin
82. DIP stand for:
Correct : B. dual inline
package
83. SBA stand for:
Correct : C. segment base address
84. BP stand for:
Correct : B. base pointer
85. ALE stand for:
Correct : A. address latch enable
86. The offset of a particular segment varies from
:
Correct : B. 0000h to ffffh
87. by the microprocessor:
Correct : A. cache memory
88. which is the small amount of high- speed memory used to work directly with the microprocessor:
Correct : A. cache
89. The cache usually gets its data from the whenever the instruction or data is required by the CPU:
Correct : A. main memory
90. Which causes the microprocessor to immediately terminate its present activity: