WorksheetsMicrocontroller Unit - V
Total questions: 25
Worksheet time: 14mins
8255 IC is
Programmable Processing and Interface
Programmable Peripheral Interface
Processing and Peripheral Interconnect
Microcontroller IC
8255 is ___________ pin IC
20
30
40
50
How many ports are there in 8255?
1
2
3
4
The modes of 8255 can be classified into
Input and Output Mode
Bit Set/Reset Mode
I/O mode and BSR Mode
None of the above
I/O mode can be further classified into __________ modes
2
3
4
5
Bit set/reset mode is related to
Port A
Port B
Port C
Control Word Register
What is the external RAM and ROM that can be interfaced with 8051
128 bytes
4 KB
64 KB
32 KB
Which sensor is used to measure temperature
LM34
LM35
Both LM34 and LM35
None of the above
What is the full form of ADC
Alternating and Direct Current
Address and data controller
Analog data Control
Analog to Digital Converter
Which conversion technique is used in ADC0808?
Ramp Type A/D Converter
Successive Approximation A/D Converter
Dual slope A/D Converter
Flash type A/D Converter
How many keys are there in 4 x 4 key matrix?
4
8
12
16
What are the types available in 7-segment display?
Common Cathode
Common Anode
Common Cathode and Common Anode
None of the above
The speed of the DC motor is controlled by _______ method
Pulse Code Modulation
Pulse Width Modulation
Pulse Amplitude Modulation
Pulse Train
How many address lines are required to connect 16KB of ROM
12
13
14
15
How many address lines are required to connect 8K RAM
12
13
14
15
List some of the interfacing techniques in Unit - 5
7 Segment LED Interfacing
Keypad Interfacing
LCD Interfacing
Stepper Motor Interfacing
How many inputs can be provided in ADC0808?
2
4
6
8
To get 2 displayed by a 7 segment display (common anode), what should be the combination of 8051 pins (P1.7 – P1.0)?
01111101
10111110
01011011
10100100
Which of the following is the correct combination to select port C in an 8255 chip?
CS = 0, A1 = 0, A0 = 0
CS = 0, A1 = 0, A0 = 1
CS = 1. A1 = 0, A0 = 0
CS = 0, A1 = 1, A0 =0
EA’ pin of 8051 is connected to VCC , the memory split up of program memory is,
64Kb of internal ROM,0Kb of external memory
0Kb of internal ROM,64Kb of external memory
4Kb of internal ROM,60Kb of external memory
4Kb of internal ROM,64Kb of external memory
Which of the following interface is used for waveform generation using the 8051 microcontrollers?
ADC
DAC
ACD
CAD
When the port lines of a port are to be used as input lines then the value that must be written to the port address is
F0H
0FH
FFH
00H
To convert its current output into a voltage, the DAC 0808 is connected with
Transistor (BJT) Externally
FET Externally
OPAMP Internally
OPAMP Externally
What are DPDT relays?
Single pole, single throw
Single pole, double throw
Double pole, double throw
None of the mentioned
Why do we need a ULN2803 in driving a relay?
for switching a motor
for increasing the current
for increasing the power
for switching the voltage
