T5_T9

T5_T9

University

20 Qs

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T5_T9

T5_T9

Assessment

Quiz

Engineering

University

Medium

Created by

Aishwarya Gangajaliwale

Used 1+ times

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20 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

While designing an embedded LED display board using PIC18F4520, TRISB is configured as 0x00. What is the effect of this setting on LED control?

All LEDs connected to Port B can now be driven as outputs
All LEDs connected to Port B are disabled
All Port B pins act as inputs for the LED
Port B becomes analog input-only

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

An engineer connects a 4-bit LCD to PORTD of a PIC and notices garbled characters on display. Which of the following is the most likely cause?

Incorrect TRISD configuration
LCD not initialized in correct mode (0x28)
Wrong data delay between nibbles
All of the above

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When interfacing a keypad to PORTB, why is configuring internal pull-ups critical?

To prevent false key detections due to floating inputs
To increase debounce speed
To enable analog readings from keys
To make keys more sensitive

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A motion detector using PIR sensor connected to RA1 continuously triggers even when no motion occurs. Which fix is most effective?

Enable RA1 as analog input
Configure RA1 as digital input and stabilize power lines
Reduce PIR voltage supply
Disable ADC module

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In a home automation project, a buzzer connected to RC2 fails to turn OFF after trigger. Which embedded C technique helps prevent this issue?

Polling loops for each condition
Timer interrupt–based control logic
Direct port toggling without delay
Nested delay loops

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

While debugging a PIC test board, no digital outputs are observed. Oscillator settings are correct. What should be verified next?

Check configuration of LAT vs PORT registers
Verify that all TRIS bits are cleared for output ports
Inspect EEPROM configuration
Run ADC calibration

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A DAC0808 circuit produces a distorted sine wave when fed from PIC. What is the most probable software-level cause?

Incorrect reference voltage
Lookup table values not properly sequenced
DAC input pins shorted
Missing analog filter

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