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Browse complete papersIn the 8085 microprocessor, what does the instruction PCHL do?
Loads the PC with HL
Pops the PC from the stack
Loads HL with the PC
Pushes PC onto the stack
Correct answer
Loads the PC with HL
If a communication system performs effectively in between 200 Hz to 3.4 kHz, what is its bandwidth?
200 Hz
3.2 kHz
3.6 kHz
3.4 kHz
Correct answer
200 Hz
What happens to the frequency of an astable multivibrator if the value of ONLY the timing capacitor is doubled?
The frequency remains the same.
The frequency is reduced by half.
The frequency doubles.
The frequency increases fourfold.
Correct answer
The frequency remains the same.
In a monostable configuration of IC 555,
why is the Discharge pin (Pin 7) connected directly to the Threshold pin (Pin 6)?
To allow the capacitor to charge very slowly for stable output.
To trigger the next pulse automatically.
To prevent the capacitor from ever reaching 2/3 Vcc
To ensure the capacitor is instantly discharged once the threshold is reached.
Correct answer
To allow the capacitor to charge very slowly for stable output.
What would happen if an electrical device is not earthed and a fault occurs?
The supply voltage will decrease
The exposed metal parts may carry dangerous voltage
The resistance of the device will increase
The device will automatically shut down
Correct answer
The supply voltage will decrease
What is the BCD code for decimal digit 3?
0110
0101
0011
0001
Correct answer
0110
If the same quantity is measured several times and the readings vary slightly each time,
which type of error is most likely present?
Systematic error
Random error
Parallax error
Calibration error
Correct answer
Systematic error
When a NOR-based SR flip-flop with active HIGH inputs receives a momentary logic high on its S (set) input while the R (reset) input remains low,
what will be the resulting state of the Q output?
Q becomes HIGH and remains latched HIGH
The Q output will toggle between high and low repeatedly
Both outputs will become high during the pulse
The Q output will become low after S returns to low
Correct answer
Q becomes HIGH and remains latched HIGH
What is the function of the INTA' signal in the 8085 microprocessor?
To disable interrupts
To reset the processor
To acknowledge an interrupt request
To enable interrupts
Correct answer
To disable interrupts
Signal A passes through a NOT gate and then through an AND gate where the second input is permanently set to logic 1.
What is the final output expression?
Y = Always 0
Y = A
\(Y = \overline{A}\)
Y = Always 1
Correct answer
Y = Always 0