PPSC Computer Science Chapter 17 Microprocessor And Assembly Language Online Test With Answers

PPSC Computer Science Chapter 17 Microprocessor And Assembly Language Online Test

Sr. # Questions Answers Choice
1 Which generate an interrupt to the microprocessor after a certain interval of time. 8251 8254 8255 8259
2 Which is the state of gate signal ft normal contains. Low High Un defined None
3 How many modes in 8254 2 4 6 8
4 8254 counters can count in the Binary Decimal Hexadecimal Both a and b
5 8254 gate of a counter is to either Enable counting Disable counting Both a and b None
6 8254 programmable timer counter has. 1 output signal 2 out put signal 3 out put signal 4 out put signal
7 8254 programmable timer counter has two inputs signals. CLK Gate Both a and b None
8 Which used to generate accurate time delays and can be used for other timing application such as a real time clock an event counter a digital one shot a square wave generator and a complex wave form generator. 8251 programmable timer 8255 programmable timer 8254 programmable timer 8259 programmable timer
9 An externa feedback resistor acts to control the. Gain Gate Loss Profit
10 Which converter convert binary number into their equivalent voltages. Analogue to analogue Analogue to digital Digital to digital Digital to analogue
11 Which multiplex by ADC 0808/0809 2:4 3:8 4:16 None
12 Which chip is used for analogue to digital converter. 0809 0808 Both a and b None
13 The time taken by the ADC from the active edge of SOC pulse till the active edge of EOC signal is called. Conversion over Conversion delay Conversion signal None
14 Which chip used for AD & DA converters in 8086 processor. 8251 8255 8254 8259
15 34 H& AX which operation is performed here Input Output Progress None
16 AL 7 99H which operation is performed here Input Out put Both a and b None
17 Which are used for port A in 8255 mode 1. PC0-PC2 PC3-PC7 PC6-PC7 PC3-PC5
18 Which are used for port B in 8255 CPO-PC2 PC3-PC7 PC6-PC7 PC3-CP5
19 Which mode is used to double handshakes in 8255 Mode 0 Mode 1 Mode 2 Mode 3
20 Which mode is used for single handshake in 8255 Mode 0 Mode 1 Mode 2 None
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