Questions and Answers
Given a Zener diode with a Voltage of 10V and a Vbe of 0.6V, how would you calculate the output voltage from the input waveform?
The output voltage equals the Zener voltage minus the Vbe, so the calculation yields 10V - 0.6V = 9.4V.
What assumptions must be made when plotting the Output Voltage vs Time for an ideal Op Amp circuit?
The Op Amp is considered ideal with infinite gain, infinite input impedance, and zero output impedance, and the power supply voltages should also be assumed to be within operational limits.
When given β=100, Vbe=0.7V, and Vce=0.3V, how do you determine the output voltage in the provided circuit?
Using the formula $V_{out} = V_{be} + V_{ce}$, the output voltage is calculated as $0.7V + 0.3V = 1.0V$.
What is the role of the CS signal in the embedded program for the BLDC ceiling fan?
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Explain how I2C communication is utilized in the context of the embedded program for controlling the DRV10983 motor driver.
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Study Notes
EMFLUX MOTORS PVT. LTD. Embedded Internship Assessment Test
- Assessment date: August 2024
- Structure includes two main parts: Part A and Part B, both compulsory.
Part A: Circuit Analysis Questions
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Question 1: Requires plotting a graph for Output Voltage vs. Time, starting at t = 0, based on a given circuit schematic (refer to Fig: 1.0).
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Important to include all calculations and assumptions made regarding the ideal Op Amp.
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Question 2: Involves analyzing an input voltage waveform (Vin) while considering a base-emitter voltage (Vbe) of 0.6 V and a diode Zener Voltage of 10 V.
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Output Voltage vs. Time must be plotted, referring to the schematic (Fig: 2.0).
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Question 3: Calculation of output voltage based on transistor parameters: β (current gain) = 100, Vbe = 0.7 V, Vce = 0.3 V, as shown in Fig: 3.0.
Part B: Embedded Programming Task
- Focuses on a microcontroller section for a BLDC ceiling fan regulated via power control methods.
- Internal ADC reference voltage is set to 2.5 V.
- Current sense signal (CS) corresponds to 69 mV/W, gathered from the mains supply for closed-loop control.
- I2C communication protocol is utilized for interfacing with the motor driver DRV10983.
General Guidelines
- Document all assumptions, formulas, and comments while solving each question carefully.
- Submissions must be in PDF format; handwritten responses are not accepted, though hand-drawn diagrams are permitted.
- The assessment aims to evaluate theoretical knowledge, problem-solving approaches, and practical application in automotive engineering contexts.
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Description
This assessment test evaluates your knowledge in circuit analysis and embedded programming. It consists of two parts: Circuit Analysis questions involving voltage plotting and transistor calculations, and a programming task related to microcontroller regulation for a BLDC ceiling fan. Prepare to demonstrate your analytical and coding skills effectively.
