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ECOR1044 – Mechatronics Exam Study Questions with Correct Solutions
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ECOR1044 – Mechatronics Exam Study Questions with Correct Solutions
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ECOR1044 – Mechatronics ExamStudy Questions with Correct
Solutions
What is sampling? - ANSWER Conversion of a continuous signal to a discrete-
time signal.
What is quantizing? - ANSWER Conversion of a discrete-time signal to discrete
amplitude signal.
What is encoding? - ANSWER Conversion of a discrete signal to binary word.
What is resolution/quantization step-size (Q)? - ANSWER The smallest voltage that can
be encoded digitally, in other words the voltage represented by the least significant bit.
What is sampling rate or frequency? - ANSWER This is the frequency at which
ADC evaluates the analog signal.
What is aliasing? - ANSWER An effect that causes different signals to
become indistinguishable when sampled.
When does aliasing occur? - ANSWER Occurs when the input signal is changing
much faster than the sample rate.
What is the Nyquist rule? - ANSWER Use a sampling frequency at least twice as
high as the maximum frequency in the signal to avoid aliasing.
What are 2 ways to improve accuracy of A/D conversion? - ANSWER Increase
resolution, increase sampling rate.
, The Raspberry Pi primarily interacts with analog devices. True or false? - ANSWER
False. To interact with the Raspberry Pi, we must first convert them to a digital
signal using an external ADC.
What does an input device do? - ANSWER Provide information to a computer.
A keyboard is an input device. True or false? - ANSWER True.
What does an output device do? - ANSWER Sends data from a computer to another
device or a user.
A speaker is an input device. True or false? - ANSWER False. A speaker is an output
device.
What is soldering? - ANSWER Process in which 2 or more metal items are joined by
melting and then flowing a filler metal into the joint.
What is a push button? - ANSWER An input device that acts as a switch.
Light dependent resistor (LDR) is a... - ANSWER Light sensor.
Resistance of the LDR increases with a decrease in light and decrease with an
increase in light. True or False? - ANSWER True.
The thermistor is a... - ANSWER Temperature sensor.
What are the 2 types of thermistors? - ANSWER Negative temperature coefficient
(NTC) and positive temperature coefficient (PTC).
For negative temperature coefficient (NTC), when temperature increases, does
resistance increase or decrease? - ANSWER Decrease.
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