10+ CertifyOS Interview Questions and Answers

Truncate removes all records from a table, while delete removes specific records. Drop deletes the table itself.

• Truncate is faster than delete as it does not log individual row deletions.

• Delete can be rolled back, while truncate cannot be rolled back.

• Drop removes the table structure along with all its data.

• Example: TRUNCATE TABLE table_name;

• Example: DELETE FROM table_name WHERE condition;

• Example: DROP TABLE table_name;

The public static void main is the entry point of a Java program.

• public: Access modifier indicating that the method is accessible from outside the class.

• static: Indicates that the method belongs to the class itself, not to instances of the class.

• void: Indicates that the method does not return any value.

• main: The name of the method that serves as the entry point for the program.

• String[] args: An array of strings that can be passed as arguments when the program is run.

Table index motor voltage varies depending on the specific motor and application.

• Table index motor voltage can range from 110V to 480V depending on the motor size and power requirements

• It is important to consult the motor's specifications or manual to determine the correct operating voltage

• Using the wrong voltage can damage the motor and lead to malfunction

• Some common voltages for table index motors include 220V and 380V

The table index problem in special purpose machines refers to issues with the positioning of the table during operation.

• Check for any mechanical issues with the table indexing mechanism

• Inspect the sensors and actuators responsible for table movement

• Verify the programming logic for table indexing in the machine's control system

• Ensure proper calibration of the table positioning system

• Consider potential wear and tear of components affecting table indexing

The 4 pillars of Java are encapsulation, inheritance, polymorphism, and abstraction.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Inheritance: Allows a class to inherit properties and behavior from another class.

• Polymorphism: Ability of an object to take on many forms.

• Abstraction: Hiding the implementation details and showing only the necessary features of an object.

An RLC circuit is a circuit consisting of a resistor, inductor, and capacitor. Sensors can be integrated into RLC circuits for various applications.

• RLC circuit includes a resistor, inductor, and capacitor in series or parallel

• Sensors can be used to measure parameters like voltage, current, temperature, etc. in the circuit

• Examples of sensors in RLC circuits include voltage sensors, current sensors, temperature sensors, etc.

Categories of defects include dimensional, cosmetic, functional, and safety-related defects.

• Dimensional defects: Variations in size or shape that affect the product's performance.

• Cosmetic defects: Surface imperfections that do not impact functionality but affect appearance.

• Functional defects: Issues that prevent the product from performing its intended purpose.

• Safety-related defects: Flaws that pose a risk to the user's safety.

• Examples: scratches on a phone screen (cosmetic),...read more

Technical knowledge refers to the understanding and application of principles, concepts, and techniques within a specific field of study or profession.

• Understanding of electrical circuits and systems

• Knowledge of electrical components and their functions

• Ability to read and interpret technical drawings and schematics

• Proficiency in using software tools for design and analysis

• Awareness of safety regulations and standards in the industry

Company folder knowledge refers to the understanding of the organization's file structure, naming conventions, and storage locations.

• Understanding how files are organized within the company's shared drive

• Knowing the naming conventions used for files and folders

• Being aware of the storage locations for different types of documents

• Ensuring proper permissions and access rights are maintained for sensitive information

The tapping head problem in an Spm machine may be caused by issues with the spindle, motor, or control system.

• Check the spindle for any wear or damage that may be affecting the tapping operation.

• Inspect the motor to ensure it is functioning properly and providing enough power for tapping.

• Verify the control system settings to make sure they are correctly configured for tapping operations.

Least count of a micrometer is the smallest measurement that can be read on the scale of the micrometer.

• Least count is calculated by dividing the smallest division on the main scale by the total number of divisions on the circular scale.

• For example, if the smallest division on the main scale is 0.5 mm and there are 50 divisions on the circular scale, the least count would be 0.5 mm / 50 = 0.01 mm.

• It determines the precision of measurements taken using the micrometer.

G & M code is a language used in CNC programming to control the movements and functions of a machine tool.

• G code specifies the movements and positions of the tool, such as cutting speed and tool path.

• M code controls auxiliary functions like coolant flow or spindle speed.

• Examples: G01 is a linear interpolation command, M03 is spindle on clockwise command.

PDCA cycle is a continuous improvement method consisting of Plan, Do, Check, and Act stages.

• Plan: Identify the problem and plan a solution.

• Do: Implement the plan on a small scale.

• Check: Evaluate the results and compare them to the expected outcomes.

• Act: Take necessary actions based on the evaluation to improve the process.

• Example: A production team uses PDCA cycle to reduce defects in a manufacturing process.

A transformer is a device that transfers electrical energy between two or more circuits through electromagnetic induction.

• Transformers work on the principle of electromagnetic induction

• They have two coils - primary and secondary - that are magnetically coupled

• The primary coil is connected to a source of alternating current, creating a changing magnetic field

• This changing magnetic field induces a voltage in the secondary coil, transferring energy between the two circuits

• Transf...read more