Given below are the answers to Infosys Fresher Aptitude 2020 Sample Question Paper Pseudocode. Comment below if you have any doubts. The full video is below for you to watch.
Motor and Motor Control Circuits Course Project 1 Quiz Answers
....Refer to our video lab on specifying a DC motor speed measurement. How does an FET work?
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It is not possible to measure the back EMF directly
....Refer to our video lab on specifying a DC motor speed measurement. Sup. pose the motor resistance is 2 ohms, motor inductance is 5 milli-henries, external voltage is 5 volts, and the back EMF time constant is .009 per RPM. As the motor accelerates, what is the motor current in milliamps at time t = 20 milliseconds when the motor is running at 500 RPM. Ignore any oscillation of the back EMF voltage due to commutation. Type an integer value of milli-amps.
250
....Refer to our video lab on specifying a DC motor speed measurement. Why does the frequency of ripples in the de caying DC current signal increase as the motor speeds up? Select all that apply.
The ripples are evidence of the mechanical commutation of the brushes
The higher the speed of the motor, the more often that commutation takes place.
....Refer to our video lab on specifying a DC motor speed measurement. Why does the motor current rapidly rise upon turning the FET on, and then slowly decay while the motor speeds up?
When the FET turns on, the motor current rises exponentially per its L/ R time constant. Speed is slow at first, and the low back EMF does not affect current. Once the motor speed picks up the back EMF rises, and the motor current decays.
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