10+ Praxis Interactive Services Interview Questions and Answers

Different materials used in an IC engine include cast iron, aluminum alloy, steel, and copper.

• Cast iron is used for the engine block and cylinder heads due to its high strength and heat resistance.

• Aluminum alloy is used for pistons and cylinder heads to reduce weight and improve heat dissipation.

• Steel is used for crankshafts and connecting rods for their high strength and durability.

• Copper is used for engine gaskets and seals due to its excellent heat and electrical conductiv...read more

Isometric part can be converted to 2D drawing with GD&T.

• Isometric drawing shows the 3D view of the part, while 2D drawing shows the top, front, and side views.

• GD&T (Geometric Dimensioning and Tolerancing) is used to specify the dimensions and tolerances of the part.

• To convert isometric part to 2D drawing with GD&T, first create the top, front, and side views, then add the dimensions and tolerances using GD&T symbols.

• Examples of GD&T symbols include perpendicularity, concentri...read more

1st, 2nd and 3rd view angles are different ways of representing an object in engineering drawings.

• First angle projection: object is placed in the first quadrant of the reference plane and viewed from the opposite side of the plane

• Second angle projection: object is placed in the third quadrant of the reference plane and viewed from the opposite side of the plane

• Third angle projection: object is placed in the first quadrant of the reference plane and viewed from the same side o...read more

PLC is a digital computer used for automation of electromechanical processes in industries.

• PLC is a hardware device that receives inputs from sensors and other devices, processes them using a program, and then generates outputs to control machines or processes.

• It is used in industries for automation of various processes such as assembly lines, packaging, and material handling.

• PLCs can be programmed using ladder logic, function block diagrams, or structured text.

• Examples of PL...read more

The minimum length of a screw depends on the specific application and requirements.

• The minimum length of a screw is determined by the thickness of the materials being joined.

• It is important to consider the depth of the hole or the thickness of the material to ensure proper engagement of the screw.

• Factors such as load-bearing capacity, torque requirements, and environmental conditions may also influence the minimum length of a screw.

• For example, when joining two pieces of wood...read more

Calculations for selecting components like pneumatic cylinders, bearings, gears, hydraulics, and lm guides involve considering load requirements, operating conditions, and safety factors.

• Determine the load requirements for each component based on the application

• Consider the operating conditions such as speed, temperature, and environment

• Calculate the safety factors to ensure the components can withstand unexpected loads

• Select components with appropriate load ratings and sizes...read more

Valves are devices used to control the flow of fluids or gases. There are several types of valves used in different applications.

• Gate valves

• Globe valves

• Ball valves

• Butterfly valves

• Check valves

• Diaphragm valves

• Needle valves

• Pinch valves

• Pressure relief valves

• Solenoid valves

Materials selection is based on factors like mechanical properties, cost, availability, and environmental impact.

• Consider the mechanical properties required for the application (e.g. strength, stiffness, toughness)

• Evaluate the cost of materials and compare it to the budget for the project

• Assess the availability of materials in the required quantity and timeframe

• Take into account the environmental impact of the materials and choose sustainable options if possible

The number of degrees of freedom controlled in a fixture depends on the type and complexity of the fixture.

• A simple fixture may control only one degree of freedom, such as rotation around a single axis.

• A more complex fixture may control multiple degrees of freedom, such as rotation around multiple axes and translation in multiple directions.

• The number of degrees of freedom controlled in a fixture can also depend on the specific application and requirements of the part being h...read more

Hydraulics involve the use of fluids to transmit power in mechanical systems, with components like pumps, cylinders, valves, and hoses.

• Hydraulics use incompressible fluids to transmit power

• Components include pumps to generate fluid flow, cylinders to convert fluid power into mechanical power, valves to control flow direction, and hoses to connect components

• Common examples include hydraulic systems in heavy machinery, automotive brakes, and aircraft landing gear

Ohm's Law is a fundamental principle in electrical engineering that relates the current flowing through a conductor to the voltage across it and the resistance of the conductor.

• Ohm's Law states that the current (I) flowing through a conductor is directly proportional to the voltage (V) across it and inversely proportional to the resistance (R) of the conductor.

• The formula for Ohm's Law is: V = I * R, where V is the voltage, I is the current, and R is the resistance.

• The unit o...read more

Turning, turnmill, and milling are all machining processes used to create cylindrical or flat surfaces on a workpiece.

• Turning involves rotating a workpiece on a lathe while a cutting tool removes material to create cylindrical shapes.

• Turnmill combines turning and milling processes in one machine, allowing for complex shapes and features to be created in a single setup.

• Milling uses a rotating cutting tool to remove material from a workpiece to create flat or contoured surfaces...read more

Safety relay is an electromechanical device that monitors the safety functions of a machine and stops it if a safety issue is detected.

• Safety relays are used to monitor safety functions such as emergency stops, guard doors, light curtains, etc.

• They work by using input signals from safety devices to determine if the machine is in a safe state.

• If a safety issue is detected, the safety relay will open its contacts and stop the machine.

• Safety relays are designed to be fail-safe, ...read more

The axes in CNC refer to the directions in which a machine can move to perform cutting or shaping operations.

• The most common axes in CNC are X, Y, and Z, representing horizontal, vertical, and depth movements respectively.

• Some machines may have additional axes such as A, B, or C for rotational movements.

• Each axis is controlled by a motor or servo drive to accurately position the cutting tool.

• The combination of movements along different axes allows for complex shapes to be mac...read more

The current unit is the ampere (A), which measures the flow of electric charge.

• The ampere is named after the French physicist André-Marie Ampère.

• Current is the rate at which electric charge flows through a conductor.

• Other common units for current include milliamperes (mA) and microamperes (μA).

The new product development validation process involves testing and verifying the functionality, reliability, and safety of the product before launch.

• Develop a validation plan outlining the testing procedures and criteria

• Conduct various tests such as functionality testing, reliability testing, and safety testing

• Collect and analyze data from tests to ensure the product meets requirements

• Iterate on design and testing based on feedback and results

• Involve cross-functional teams i...read more

The voltage unit is measured in volts (V).

• The voltage unit is denoted by the symbol V.

• Voltage is the potential difference between two points in an electrical circuit.

• Common examples of voltage units include millivolts (mV), kilovolts (kV), and megavolts (MV).

12 Degree of Freedom refers to the number of independent movements a rigid body can make in 3D space.

• A rigid body with 12 degrees of freedom can move in any direction and rotate around any axis.

• The 12 degrees of freedom are divided into 6 translational and 6 rotational degrees of freedom.

• Examples of systems with 12 degrees of freedom include a spacecraft in orbit or a robot arm with 6 joints.