Electronics & Automation
15 free questions with worked answers, and 60 more in the full bank.
Free questions
A technician is documenting ladder-logic contact. Which statement belongs in the notes?
1 mark · Easy
A certification question asks about servo motor system. Which answer is correct?
3 marks · Medium
A certification question asks about stepper motor. Which answer is correct?
1 mark · Easy
A certification question asks about protective grounding. Which answer is correct?
4 marks · Hard
A certification question asks about verification of zero energy. Which answer is correct?
4 marks · Hard
A supervisor tests your knowledge of semiconductor diode. Which answer is best?
1 mark · Easy
A supervisor tests your knowledge of binary number system. Which answer is best?
3 marks · Medium
A supervisor tests your knowledge of thermocouple. Which answer is best?
3 marks · Medium
A supervisor tests your knowledge of PLC scan cycle. Which answer is best?
3 marks · Medium
A certification question asks about Zener diode. Which answer is correct?
1 mark · Easy
A certification question asks about AND gate. Which answer is correct?
1 mark · Easy
A certification question asks about resistance temperature detector. Which answer is correct?
1 mark · Easy
A supervisor tests your knowledge of bipolar junction transistor. Which answer is best?
1 mark · Easy
A supervisor tests your knowledge of OR gate. Which answer is best?
3 marks · Medium
A supervisor tests your knowledge of thermistor. Which answer is best?
3 marks · Medium
More Electronics & Automation questions
Answers and explanations are in the full bank.
- During troubleshooting, which explanation of MOSFET is accurate? · 3 marks
- During troubleshooting, which explanation of NOT gate is accurate? · 3 marks
- A beginner asks about binary number system. Which answer should you give? · 1 mark
- A beginner asks about thermocouple. Which answer should you give? · 1 mark
- A beginner asks about PLC scan cycle. Which answer should you give? · 3 marks
- In a technical interview, what is true about verification of zero energy? · 1 mark
- What is the best technical explanation of semiconductor diode? · 3 marks
- What is the best technical explanation of binary number system? · 3 marks
- During routine technical work, which statement about a semiconductor diode should guide the technician? · 3 marks
- During routine technical work, which statement about a Zener diode should guide the technician? · 3 marks
- During routine technical work, which statement about a bipolar junction transistor should guide the technician? · 3 marks
- During routine technical work, which statement about a MOSFET should guide the technician? · 3 marks
- During routine technical work, which statement about an operational amplifier should guide the technician? · 3 marks
- During routine technical work, which statement about a voltage comparator should guide the technician? · 3 marks
- During routine technical work, which statement about an RC low-pass filter should guide the technician? · 3 marks
- During routine technical work, which statement about the Nyquist sampling condition should guide the technician? · 3 marks
- During routine technical work, which statement about an analog-to-digital converter should guide the technician? · 3 marks
- During routine technical work, which statement about a digital-to-analog converter should guide the technician? · 3 marks
- During routine technical work, which statement about an AND gate should guide the technician? · 3 marks
- During routine technical work, which statement about an OR gate should guide the technician? · 3 marks
- During routine technical work, which statement about an XOR gate should guide the technician? · 3 marks
- During routine technical work, which statement about a NOT gate should guide the technician? · 3 marks
- During routine technical work, which statement about a flip-flop should guide the technician? · 3 marks
- During routine technical work, which statement about a PLC scan cycle should guide the technician? · 3 marks
- During routine technical work, which statement about a normally open ladder-logic contact should guide the technician? · 3 marks
- During routine technical work, which statement about a 4-20 mA measurement loop should guide the technician? · 3 marks
- During routine technical work, which statement about PID control should guide the technician? · 3 marks
- During routine technical work, which statement about a servo motor system should guide the technician? · 3 marks
- A transformer has 960 primary turns and 192 secondary turns, with 400 V on the primary. What is the secondary voltage? · 3 marks
- A control waveform runs at 1500 Hz. What is its period? · 1 mark
- During a workshop assessment, the reported condition is: A rectifier output remains AC-like, and resistance tests show one diode conducts strongly in both directions. Which diode fault is most likely? · 1 mark
- During a workshop assessment, the reported condition is: A series Zener regulator output rises almost to the input voltage, and the Zener measures open after isolation. What explains the output? · 3 marks
- During a workshop assessment, the reported condition is: A BJT switch never saturates because its base current is far below the design value. What should be reviewed? · 1 mark
- During a workshop assessment, the reported condition is: A MOSFET becomes hot even though average load current is within rating, and its gate waveform switches slowly. Which loss is likely increasing? · 3 marks
- During a workshop assessment, the reported condition is: An op-amp output is pinned near its positive supply while the required calculated output is higher than the available rail. What condition is present? · 1 mark
- During a workshop assessment, the reported condition is: A comparator output chatters when a noisy sensor voltage is close to the threshold. What modification is commonly used? · 3 marks
- During a workshop assessment, the reported condition is: An RC low-pass filter attenuates a desired signal because the chosen cutoff frequency is far below that signal. What should be adjusted? · 1 mark
- During a workshop assessment, the reported condition is: An ADC input exceeds its reference range and all high samples read the maximum code. What is happening? · 3 marks
- During a workshop assessment, the reported condition is: A 7 kHz signal is sampled at 10 kHz without adequate input filtering and appears as a lower false frequency. Which phenomenon is responsible? · 1 mark
- During a workshop assessment, the reported condition is: A low-resolution DAC produces visible voltage steps in a slowly changing waveform. What design characteristic causes this? · 3 marks
- During a workshop assessment, the reported condition is: An unused CMOS logic input is left floating and the circuit switches unpredictably. What should be done? · 1 mark
- During a workshop assessment, the reported condition is: A mechanical pushbutton causes several rapid count pulses for one press. Which circuit or software function is needed? · 3 marks
- During a workshop assessment, the reported condition is: A flip-flop captures inconsistent data because its input changes too close to the clock edge. Which timing requirement is being violated? · 1 mark
- During a workshop assessment, the reported condition is: A PLC input indicator turns on, but the expected output never energizes and the output instruction is false in the logic monitor. Where should troubleshooting focus? · 3 marks
- During a workshop assessment, the reported condition is: A 4-20 mA transmitter loop measures 0 mA at the controller input. What should be checked first? · 1 mark
- During a workshop assessment, the reported condition is: A temperature transmitter reads below range and diagnostics indicate an open sensor. What physical checks are appropriate? · 3 marks
- During a workshop assessment, the reported condition is: A PID-controlled temperature loop oscillates continuously after aggressive tuning changes. What should be done? · 1 mark
- During a workshop assessment, the reported condition is: A motor driven by a VFD overheats at low speed while producing constant high torque. Which issue should be considered? · 3 marks
- During a workshop assessment, the reported condition is: A servo axis hunts around its commanded position after mechanical backlash increased. What should be investigated? · 1 mark
- During a workshop assessment, the reported condition is: A stepper motor loses position during rapid acceleration but holds accurately at low speed. What is the likely cause? · 3 marks
- Divider EA4-D1 has 5 V input, 100 Ω upper resistor, and 200 Ω lower resistor with no load. What output appears across the lower resistor? · 1 mark
- RC network EA4-T1 uses 1000 Ω and 10 µF. What time constant τ = RC is expected? · 1 mark
- Filter EA4-F1 uses R = 1000 Ω and C = 0.1 µF. What approximate cutoff frequency 1/(2πRC) results? · 1 mark
- ADC EA4-A1 has 8 bits and 3.3 V reference. Using Vref/2^N, what ideal LSB size is expected? · 1 mark
- Ideal 10-bit ADC EA4-C1 uses 5 V reference and measures 0.5 V. What nearest output code using Vin/Vref × 1023 is expected? · 1 mark
- Ideal 8-bit DAC EA4-G1 uses 5 V full scale and code 30. Using code/255 × 5 V, what output is expected? · 1 mark
- Transmitter EA4-I1 maps 4-20 mA to 0-100 units and outputs 4 mA. What process value is represented? · 1 mark
- PWM signal EA4-P1 is high for 2 ms in a 10 ms period. What duty cycle does it have? · 1 mark
- Control waveform EA4-W1 operates at 50 Hz. What period does this correspond to? · 1 mark
- Op-amp EA4-O1 is non-inverting with Rin 1000 Ω, Rf 2000 Ω, and 0.2 V input. What ideal output follows from gain 1 + Rf/Rin? · 1 mark