Interview FAQ

For Electrical Engineers

  • What is control panel? Types of control panel.
  • How to control a motor for various speed condition? Explain with diagram.
  • What is busbar. Where are they use?
  • Why transformer rating is in KVA?
  • How to calculate Current if motor is connected in star?
  • What is GA?
  • Draw the control circuit for 50 hp motor connected in lift?
  • Why do motor run in delta not in star?
  • Draw motor to PLC connection diagram?
  • How to show the RPM of motor on HMI in order to achieve accuracy?

For EXTC/EC Engineers

  • What are IGBT? Where are they used?
  • Why only zener diode act as a voltage regulator?
  • What is PWM?
  • What is a rectifier? Types of rectifiers?
  • What is OP-Amp?
  • Draw the Flip Flop gate?
  • How does a transistor act as a switch?
  • What is sinking & sourcing connection?
  • What is a proximity sensor?
  • How to connect proximity sensor to plc?

For Instrumentation & Control Engineers

  • What are Active transducers and Passive transducers?
  • What are open loop systems and Closed loop systems? Give the examples for the same for day-to-day and industrial applications.
  • Explain Ionization gauge. Explain Hot cathode and Cold cathode concepts for the same.
  • Explain Dead Weight pressure gauge.
  • Explain McLeod gauge.
  • List different transducers that are used for pressure measurement.
  • Explain Differential manometer.
  • Define Absolute pressure, gauge pressure, Differential pressure.
  • List and explain in brief different types of electronic pressure sensors.
  • Define and explain in short Temperature coefficient and also define NTC, PTC

Training programme


Precon Automation and Systems Pvt. Ltd.
318, Anant Laxmi Chambers, Opp. Waman Hari Pethe Jewelers,
Dada Patil Wadi, B-Cabin Road, Naupada, Thane (W) - 400 602.

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Precon Automation & Systems Pvt Ltd

ISO 9001:2008 Certified Company
318 Anant Laxmi Chambers, B-Cabin Road, Opp Waman Hari Pethe Jewellers, Dada Patil Wadi
Thane, Maharashtra 400602

Mon-Sat 10am - 6pm
P: +91 (022) 41234900

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