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Mechatronics Interview Questions And Answers

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  • How failure of Knuckle Pin occurs?

The most common mode of failure is overloading. Operating forces of the application produce loads that exceed the clamp load and the joint works itself loose, or fails catastrophically. It occur due to shear forces and twisting moment.

  • In a fillet weld the weakest section is the
    1. Smaller side of the fillet
    2. Throat of the fillet
    3. Side perpendicular to force
    4. Side parallel to force


Throat of the fillet

  • An automobile vehicle heats up while lying in a parking lot on a sunny day. The process can be assumed to be
    1. Isothermal
    2. Isobaric
    3. Isometric
    4. Isentrophic



  • What is the Expansion of SCADA, DCS & HMI?

SCADA- Supervisory Control And Data Acquisition

DCS- Distribution Control System and

HMI – Human Machine Interface

  • Method for Testing Light Emitting Diode ( LED )?

Give forward Bias voltage to the LED’s pin by using Multi meter,if it is ok then it will glow up or remains in off state.

  • What is principal work of “O ring”?

O rings are fitted to form a leak proof joints between two mating surfaces. O ring is like a Gasket which is made by rubber to protect the leakage of gas or vapour in-between two metal products.

  • What is the difference between Relay and Contactor?

Purpose of a relay is to protect a device or a circuit. Whereas purpose of a contactor is to make and break the circuit thereby extracting the required signals from their auxiliary contacts.

  • How to make various operations by Pressing a single push button
    (at least for 2 operation) ?

It is simple by using contactors and auxiliary relays to do the operation. BMS (Building Management System ) and PLC (Programmable Logic Controller) are the latest versions but comparatively expensive.

  • What is the Difference Between SCADA and BMS?

SCADA is a control and data acquisition interface software, installed on computers (often PCs) and used with industrial automation controls (PLCs). They are generally developed by automation product manufacturers, (Rockwell, Siemens, Invensys, by some independents) (often bought by larger automation industries, look at wonder ware, Citect, In-touch), and sometimes by individuals who like their own interfaces in Visual C, Delphi… Communications are carried out over specialized buses such as Modbus, Profibus, Fieldbus, Industrial Ethernet… and the sensors, drives, motor controllers are designed to exchange with the PLCs over such links.

Building Management Systems are a parallel industry; components are different, manufacturers are HVAC and lighting industrials (Carrier, Trane, Honeywell) and standards are different. They use different communication protocols (BACNET, EIB, Lon Works) and different standards. Generally, industrial standards will use more power, control higher voltages, and use smaller gauge wire than building automation.

  • How to control Temperature (Electronics way)?

We can use 1 RTD ( Resistance Temperature Detector ) for temperature detection.  When temperature change, resistance also changes in RTD. This RTD input can be given to a PLC and from the output of the PLC a valve can be controlled based on RTD input. This valve can in turn control the temperature of a container by the valve ON/OFF operation.

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