Polyplastics Industries (I) Senior Electrical Maintenance Engineer Interview Questions and Answers

Q1. Star delta starter control circuit
Add your answer
Q2. DG full load current
Add your answer

Q1. Which bearing used in CNC spindle? And why ?
Ans. 
Angular contact ball bearings are commonly used in CNC spindles due to their ability to handle both radial and axial loads.
• Angular contact ball bearings are used in CNC spindles because they can handle both radial and axial loads efficiently.

• These bearings provide high rigidity and accuracy, which are crucial for CNC machining operations.

• The contact angle of angular contact ball bearings can be adjusted to optimize per...read more
Answered by AI
Add your answer
Q2. What is Backlash?and how to check it ?
Ans. 
Backlash is the amount of clearance or play between two mating components in a mechanical system.
• Backlash is commonly found in gear systems, where it can affect the accuracy and efficiency of the system.

• To check backlash, one can use a dial indicator to measure the amount of movement between the components when they change direction.

• Backlash can be adjusted by tightening or loosening the components to reduce the cleara...read more
Answered by AI
Add your answer
Q3. How many types of Hydraulic valve are there ? Diffenciate between pressure relief and pressure reducing valve.
Ans. 
There are various types of hydraulic valves, including pressure relief and pressure reducing valves.
• Types of hydraulic valves include directional control valves, flow control valves, pressure control valves, and check valves.

• Pressure relief valves are designed to limit the pressure within a hydraulic system by diverting excess fluid when the pressure reaches a certain level.

• Pressure reducing valves, on the other hand, ...read more
Answered by AI
Add your answer

Q1. What is the plc
Ans. 
PLC stands for Programmable Logic Controller, a digital computer used for automation of electromechanical processes.
• PLC is used to control machinery in industries by programming sequences of operations.

• It is designed to withstand harsh industrial environments.

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

• They are commonly used in manufacturing, automotive, and food processing in...read more
Answered by AI
Add your answer
Q2. What is cnc machine
Ans. 
A CNC machine is a computer-controlled machine tool used for cutting, shaping, and finishing metal, wood, or other materials.
• CNC stands for Computer Numerical Control

• CNC machines use coded instructions to control the movement of the cutting tool

• Common types of CNC machines include milling machines, lathes, and routers

• CNC machines are widely used in manufacturing industries for precision machining
Answered by AI
Add your answer
Q3. What is servo drive
Ans. 
A servo drive is an electronic amplifier used to power and control servo motors in automation systems.
• Converts low-power control signals into high-power signals to drive the servo motor

• Provides precise control over the speed, position, and torque of the motor

• Used in robotics, CNC machines, conveyor systems, etc.
Answered by AI
Add your answer
Q4. External encorder by pass parameter in cnc
Ans. 
External encoder bypass parameter in CNC allows the machine to ignore the feedback from the external encoder and use internal feedback instead.
• External encoder bypass parameter is used in CNC machines to switch between using external encoder feedback and internal feedback.

• This parameter is typically used when the external encoder is malfunctioning or needs to be bypassed for testing purposes.

• By setting the bypass param...read more
Answered by AI
Add your answer

Basic from our bachelor degree

Q1. Simple question about my self and some technical questions
Add your answer

Q1. Basics core subject questions
Add your answer

Q1. Dept oriented questions
Add your answer
Q2. Genral , plc , utility , CNC Type questions
Add your answer

Q1. Draw a circuit diagram to convert 230v ac to 24v dc.
Add your answer
Q2. PLC Ladder logic Diagram
Add your answer

Q1. What is the reason behind temperature rise up of hydraulic oil in die casting machine
Ans. 
Temperature rise of hydraulic oil in die casting machine is caused by friction, overloading, inadequate cooling, or contaminated oil.
• Friction between moving parts can generate heat and increase oil temperature

• Overloading the machine can cause excessive heat generation

• Inadequate cooling system or malfunctioning cooling components can lead to temperature rise

• Contaminated oil with debris or moisture can reduce lubrication
Answered by AI
View 1 more answer

Q1. Regarding my notice period and past experience we mutually Decided my salary scale for offer letter
Add your answer