UNIT-5
1) In ___________ data transfer mode, data is transmitted only in one direction[ c ]
a) Half duplex b) full duplex c) simplex d) single
2) Walkie-talkie is an example for________ data transmission. [ c ]
a) Simplex b) full duplex c) half duplex d) single
3) In _________ transmission the communication is in either direction but occurs [ c ]
in one direction at a time.
a)Simplex b) full duplex c) half duplex d) single
4) __________ transmission allows data transfer in both directions simultaneously.[ a ]
a) Full duplex b) simplex c) half duplex d) single
5) In serial communication data can be transmitted in _______ ways. [ d ]
a) Simplex b) full duplex c) half duplex d) all
6) ________ is an example for simplex data transmission [ c ]
a) radio b) TV broadcasting c) both (a)&(b) d) none
7) In serial communication,transmitter&receiver are not synchronized by clock[ b ]
a) Synchronous b) Asynchronous c) Both d) none
8) In Serialcommunication ,one bit is transmitted at a time over a single line.
9) In Synchronous serial communication,transmitter&receiver are synchronized by clock.
10) Parallel to serial converter converts byte of data into 8 serial bits.
11) SYNDETpin of 8251 is used in synchronous mode for detecting sync characters.
12) DTE stands for Data Terminal Equipment.
13) DCE stands for Data Communication Equipment.
14) USB supports 3 data transfer rates. They are 480 Mbps,12Mbps,1.5Mbps.
15) In USB connector, bus colour is Red.
16) MAX-232A is used for TTL to RS232&RS232 to TTL level conversion.
17) USB stands for Universal Serial Bus.
18) USART stands for Universal Synchronous Asynchronous Receiver & Transmitter.
19)8251 is known as USART.
20) TTL stands for Transistor Transistor Logic.
UNIT-6
1. In 8279 Status Word, data is read when ________ pins are low, and write to the display RAM with ____________ are low.
a) A0, CS, RD & A0, WR, CS. b) CS, WR, A0 & A0, CS, RD
c) A0, RD & WR, CS d) CS, RD & A0, CS.
2. In 8279, the keyboard entries are debounced and stored in an _________, that is further accessed by the CPU to read the key codes.
a) 8-bit FIFO b) 8-byte FIFO c) 16 byte FIFO d) 16 bit FIFO
3. The 8279 normally provides a maximum of _____ seven segment display interface with CPU.
a) 8 b) 16 c) 32 d) 18
4. For the most Static RAM the write pulse width should be at least
a) 10ns b) 60ns c) 300ns d) 1μs
5. BURST refresh in DRAM is also called as
a) Concentrated refresh b) distributed refresh c) Hidden refresh d) none
6. For the most Static RAM the maximum access time is about
a) 1ns b) 10ns c) 100ns d) 1μs
7. Which of the following statements on DRAM are correct?
i) Page mode read operation is faster than RAS read.
ii) RAS input remains active during column address strobe.
iii) The row and column addresses are strobed into the internal buffers using RAS and CAS inputs respectively.
a) i & iii b) i & ii c) all d) iii
8. 8086 microprocessor is interfaced to 8253 a programmable interval timer. The maximum number by which the clock frequency on one of the timers is divided by
a) 216 b) 28 c) 210 d) 220
9. 8086 is interfaced to two 8259s (Programmable interrupt controllers). If 8259s are in master slave configuration the number of interrupts available to the 8086 microprocessor is
a) 8 b) 16 c) 15 d) 64
10. 8096 has following features fill up the following,
i) ____ Register file,
ii) ____ I/O Ports
iii) ____ architecture.
a) 256 byte, five 8bit, register to register
b) 256 byte, four 8bit, register to register
c) 232 byte, five 8bit, register to register
d) 232 byte, six 8 bit, register to register
11. How many synchronous and asynchronous modes are there in serial port of 8096?
a) 2, 2 respectively b) 3,1 respectively c) 1, 3 respectively d) 1, 2 respectively
12. In 8096 we have _____interrupt sources and _______ interrupt vectors.
a) 18, 8 b) 21, 6 c) 21, 8 d) 16, 8
13. 8096 has ___ general purpose I/O ports, Port 2 includes ______ of the following
i) two quasi-bidirectional I/O lines
ii) two output lines
iii) four input lines
iv) open drain outputs
a) 4, i, iv b) 6, ii, iii c) 4, i,ii,iii d) 6, i, ii, iv
14. 8096 write-protected mode, no code can write to memory address between __.
a) 2020 to 3FFFH b) 8000 to FFFFH c) 2000 to 3FFFH d) 2020 to 202FH
15. If the __ pin is ___ , then we have the option of using the ____ ROM or EPROM together with _____ memory and devices.
a) EA, high, internal, external
b) EA, low, internal, external
c) EA, high, external, internal
d) EA, low, external, internal
16. In 8096, CCB bit 3 is ____.
a) write strobe mode select b) address valid strobe select
c) bus width select d) Internal read control mode
17. In 8096, mode ____ of serial port are ___ modes commonly used for ____ communications.
a) 1, 8bit, single processor b) 0, 7bit, multiple microcontroller
c) 2, 9 bit, multiple processors d) 3, 8 bit, multiple microcontroller
18. What is the function of watchdog timer?
a) The watchdog Timer is an external timer that resets the system if the software fails to operate properly.
b) The watchdog Timer is an internal timer that sets the system if the software fails to operate properly.
c) The watchdog Timer is an internal timer that resets the system if the software fails to operate properly.
d) None of them
19. Which of the following instruction perform as of indirect RAM to accumulator?
a) MOV A, Rn b) MOV @Ri, A c) MOV A, @Ri d) MOV Rn, A
20. ACALL instruction allows specifying ______address in the instruction and calling subroutine within ______ program memory block.
a) 2byte, 3K b) 11bit, 2K c) 9bit, 2K d) 1byte, 3K
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