Raheja Developers Interview Questions and Answers

A three-axis robot is a robotic system that operates in three dimensions, allowing it to move and manipulate objects in a wide range of directions.

• A three-axis robot typically consists of three linear axes, each capable of independent movement along a specific axis (X, Y, and Z).

• The X-axis controls horizontal movement, the Y-axis controls vertical movement, and the Z-axis controls depth or forward/backward movement.

• By combining movements along these three axes, the robot can ...read more

DC supply can be converted into AC supply using an inverter.

• Inverter is an electronic device that converts DC to AC.

• It uses a switching circuit to alternate the polarity of DC voltage.

• The output waveform can be modified using filters and transformers.

• Examples of inverters include square wave, modified sine wave, and pure sine wave inverters.

Draw the electrical circuit to control barrel heater through SSR/contactor.

• Start by identifying the power source and the barrel heater.

• Connect the power source to the input terminals of the SSR/contactor.

• Connect the output terminals of the SSR/contactor to the barrel heater.

• Include appropriate fuses and circuit breakers for safety.

• Consider using a control signal (e.g., from a temperature controller) to trigger the SSR/contactor.

An injection molding machine is a manufacturing tool used to produce plastic parts by injecting molten material into a mold.

• It consists of a hopper, an injection unit, a clamping unit, and a control unit.

• The hopper is used to store the plastic material that will be melted and injected into the mold.

• The injection unit melts the plastic and injects it into the mold.

• The clamping unit holds the mold in place during the injection process.

• The control unit manages the entire process...read more

There are various types of pumps used in engineering, including centrifugal pumps, reciprocating pumps, and rotary pumps.

• Centrifugal pumps are commonly used for transferring fluids by converting rotational energy into kinetic energy.

• Reciprocating pumps use a piston or plunger to create pressure and move fluid.

• Rotary pumps operate by trapping fluid between rotating components and the pump casing.

• Other types of pumps include diaphragm pumps, gear pumps, and peristaltic pumps.

The injection molding cycle involves several steps to produce a molded part.

• Clamping: The mold is closed and clamped tightly.

• Injection: Molten plastic is injected into the mold cavity.

• Cooling: The plastic solidifies and cools inside the mold.

• Ejection: The mold opens and the molded part is ejected.

• Cycling: The mold closes again for the next cycle.