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Technical Interview Questions
  • How drive works, Calculate time in one pulse ?

  • Make a ladder diagram for 05 no. outputs with one proximity switch. A conveyor moves television sets. s/w on output 1 when televisions between 15-17 pass, 2 between 18 to 20, 3 between 25-30 & 4 when 35 no television sets pass.

  • Star Delta starters & their power & control diagrams.

  • Reversing & forwarding circuits of motors.

  • On off, proportional & PID Controllers.

  • Reading of Electrical Circuits.

  • How electrical signal is obtained from pressure sensors ?

  • RTD, Principle, types, How u will recognize whether RTD or thermocouple.

  • Difference between RTD & TC.

  • Thermistor, Principle, types, uses.

  • Difference between Micrologix & SLC 5.

  • How a laptop communicates with micrologix / SLC ?

  • Which instructions Available in SLC not in micrologix ?

  • Communication cables for Allen Bradley PLCs:

    Micrologix: PM 02

    Hmi: HM 02

    SLC: CP3 Direct PLC RS 232 port

    UIC for USB port to PLC DH 485 Port

    PIC for comport to PLC DH 485 Port

  • Difference between Star-Delta & DOL ?

  • What is protocol ?

  • What is full duplex & what is half duplex ?

  • RTD, thermocouple, Basic Electronics Transistor, Diode, Not gate.

  • 6 output s/w on one by one, not to use timer & comparator, make logic.

  • Tell me something about yourself ?

  • What is SCADA ?

  • Which SCADA Software you have worked ?

  • Which all PLCs you have worked, describe individually ?

  • How many I/Os are there in micrologix ?

  • Detailed description about the projects during training.

  • How to communicate between HMI & PLC ? Which software is used for HMI ?

  • Make a program that counts 5 times, works for 5 sec & then s/w off & also use a reset button.

  • Working principle of Inductive & capacitive proximity switches.

  • Difference between relay & contactor.

  • Sourcing & sinking concept of PLCs.

  • Control the level of a tank by proportional control valve using analog level sensor.

  • 1. Define Analog & digital I/O, what is resolution ?

    2. Draw PLC Wiring.

    3. Generate a pulse & count up to 10 pulses.

    4. Load cell.