50+ Diploma Apprentice Trainee Interview Questions and Answers

G-code and M-code are programming languages used in CNC machines to control their movements and operations.

• G-code is used to control the movement of the machine, such as its speed, position, and direction.

• M-code is used to control the machine's auxiliary functions, such as turning on and off the spindle or coolant.

• Both G-code and M-code are written in a specific format and can be edited using a text editor or specialized software.

• Examples of G-code commands include G00 (rapid...read more

Switchgear is used to control, protect, and isolate electrical equipment in power systems.

• Switchgear is essential for the safe and reliable operation of electrical systems.

• It controls the flow of electrical power and protects equipment from overloads, short circuits, and faults.

• Switchgear isolates faulty equipment or sections of a power system to prevent further damage.

• It allows for maintenance and repairs to be carried out on specific parts of the system without affecting th...read more

CNC machines play a crucial role in the company's manufacturing process.

• CNC machines automate the manufacturing process, reducing human error and increasing efficiency.

• They can produce complex and precise parts that would be difficult or impossible to make by hand.

• CNC machines can be programmed to produce large quantities of parts with consistent quality.

• They are used in a variety of industries, including aerospace, automotive, and medical device manufacturing.

• Examples of CNC...read more

Level measurement is the process of determining the height of a substance in a container. Radar and ultrasonic are two common methods used for this purpose.

• Level measurement is important in industries such as oil and gas, chemical, and food processing.

• Radar level measurement uses electromagnetic waves to determine the level of a substance in a container.

• Ultrasonic level measurement uses sound waves to determine the level of a substance in a container.

• Both methods are non-cont...read more

Petrol engines use spark ignition while diesel engines use compression ignition. Pulley system is a mechanism to transmit power.

• Petrol engines use petrol as fuel while diesel engines use diesel.

• Petrol engines use spark plugs to ignite the fuel while diesel engines use compression to ignite the fuel.

• Pulley system is a mechanism to transmit power from one shaft to another using a belt or chain.

• There are three types of pulleys: fixed pulley, movable pulley, and compound pulley.

A transmitter is an electronic device that converts electrical signals into radio waves for transmission.

• Transmitter is used to send information over long distances.

• It converts electrical signals into radio waves.

• Transmitter consists of an oscillator, modulator, and amplifier.

• The oscillator generates a carrier wave, which is then modulated with the information signal.

• The modulated signal is then amplified and transmitted through an antenna.

• Examples of transmitters include rad...read more

LED stands for Light Emitting Diode.

• LED is a semiconductor device that emits light when an electric current passes through it.

• It is commonly used in various applications such as lighting, displays, and indicators.

• LEDs are energy-efficient and have a longer lifespan compared to traditional incandescent bulbs.

• They come in different colors and can be used for decorative purposes as well.

• Examples of LED applications include LED TVs, LED streetlights, LED traffic signals, and LED ...read more

Explanation of engine and its principle, piston work, and difference between two and four stroke engines.

• An engine is a machine that converts fuel into mechanical energy.

• The principle of an engine is based on the conversion of heat energy into mechanical energy.

• Piston is a component of an engine that moves up and down in a cylinder.

• In an engine, the piston compresses the fuel-air mixture, which is then ignited by a spark plug.

• The difference between two-stroke and four-stroke ...read more

AC stands for Alternating Current and DC stands for Direct Current.

• AC is an electric current that periodically reverses direction.

• DC is an electric current that flows in one direction.

• AC is commonly used in household appliances and power distribution systems.

• DC is commonly used in batteries and electronic devices.

• Examples of AC sources include generators and power grids.

• Examples of DC sources include batteries and solar panels.

Ctrl + C for copy, Ctrl + V for paste

• Ctrl + C is used to copy selected text or item

• Ctrl + V is used to paste the copied text or item

• These shortcut keys are commonly used in Windows and other operating systems

Naphtha oil is used in transformers as an insulating oil to help dissipate heat and prevent electrical breakdown.

• Naphtha oil is used as an insulating oil in transformers to provide electrical insulation and prevent arcing.

• It helps to dissipate heat generated during the operation of the transformer.

• Naphtha oil also helps in preventing the formation of sludge and carbon deposits inside the transformer.

• It improves the dielectric strength of the transformer oil, enhancing its ove...read more

Transformers are electrical devices that transfer energy between two or more circuits through electromagnetic induction.

• Transformers are used to increase or decrease the voltage of an alternating current (AC) signal.

• They consist of two or more coils of wire, known as windings, that are wound around a core made of magnetic material.

• The primary winding receives the input voltage, while the secondary winding delivers the output voltage.

• Step-up transformers increase the voltage, ...read more

Diodes are used in rectifiers to convert alternating current (AC) to direct current (DC).

• Diodes allow current to flow in only one direction, blocking the reverse flow.

• They help in converting the negative half cycles of AC to positive half cycles of DC.

• Diodes prevent the loss of power that occurs in AC circuits due to negative half cycles.

• They are essential components in power supplies, battery chargers, and electronic devices.

• Examples of rectifier circuits using diodes includ...read more

Lathe machine is used for turning and shaping cylindrical workpieces while milling machine is used for cutting and shaping flat or irregularly shaped workpieces.

• Lathe machine rotates the workpiece while the cutting tool remains stationary, while milling machine rotates the cutting tool while the workpiece remains stationary.

• Lathe machine is used for producing cylindrical shapes like shafts, rods, and bushings, while milling machine is used for producing flat or irregularly sh...read more

The main components of AC cycle are compressor, condenser, expansion valve and evaporator.

• Compressor compresses the refrigerant gas and raises its temperature.

• Condenser cools down the refrigerant gas and converts it into a high-pressure liquid.

• Expansion valve reduces the pressure of the liquid refrigerant and converts it into a low-pressure liquid.

• Evaporator absorbs heat from the surrounding and converts the low-pressure liquid into a low-pressure gas.

• The cycle repeats as the...read more

The unit of temperature is Kelvin, Celsius, and Fahrenheit. The unit of pressure is Pascal, Bar, and PSI.

• Temperature can be measured in Kelvin, Celsius, and Fahrenheit.

• Pressure can be measured in Pascal, Bar, and PSI.

• Kelvin is the SI unit of temperature.

• Pascal is the SI unit of pressure.

• Fahrenheit is commonly used in the United States.

• Bar is commonly used in Europe.

• PSI is commonly used in the United States for pressure measurement.

A temperature gauge is a device used to measure and display the temperature of a system or environment.

• Temperature gauges are commonly used in various industries such as automotive, HVAC, and manufacturing.

• They can be analog or digital, providing a visual representation of temperature.

• Some temperature gauges are designed for specific applications, such as oven thermometers or refrigerator thermometers.

• They can measure temperature in different units, such as Celsius, Fahrenhei...read more

Vertical milling machines have a spindle that moves vertically while horizontal milling machines have a spindle that moves horizontally.

• Vertical milling machines are better suited for cutting and drilling metal sheets and plates.

• Horizontal milling machines are better suited for cutting and shaping solid materials like wood and plastics.

• Vertical milling machines are typically used for producing small to medium-sized parts.

• Horizontal milling machines are typically used for prod...read more

Robots play a significant role in human life by performing tasks that are dangerous, repetitive, or impossible for humans.

• Robots can be used in manufacturing to increase efficiency and reduce human error.

• Robots can be used in healthcare to perform surgeries and assist with patient care.

• Robots can be used in exploration to gather data in environments that are too dangerous for humans.

• Robots can be used in agriculture to automate tasks such as planting and harvesting crops.

• Robo...read more

Theory of Machine is a branch of engineering that deals with the study of machines and their mechanisms.

• Theory of Machine involves the study of various types of machines and their working principles.

• It includes topics like kinematics, dynamics, and mechanisms.

• Fluid Mechanics is a branch of physics that deals with the behavior of fluids, both liquids and gases.

• It involves the study of fluid properties, fluid statics, fluid dynamics, and fluid flow.

• Fluid Mechanics is important ...read more

Electrical devices deal with the flow of electrical energy, while electronics devices use electrical energy to control the flow of electrons for various functions.

• Electrical devices primarily involve the generation, distribution, and use of electrical power.

• Electronics devices use electrical energy to control the flow of electrons for functions like amplification, switching, and signal processing.

• Examples of electrical devices include power generators, transformers, and motor...read more

5S is a workplace organization method that aims to improve efficiency and productivity by eliminating waste and optimizing workflow.

• 5S stands for Sort, Set in Order, Shine, Standardize, and Sustain

• Sort involves removing unnecessary items from the workplace

• Set in Order involves organizing the remaining items in a logical and efficient manner

• Shine involves cleaning and maintaining the workplace

• Standardize involves creating and implementing standard procedures for maintaining th...read more

Excel knowledge refers to the understanding and proficiency in using Microsoft Excel software for data analysis, calculations, and visualization.

• Understanding basic functions like SUM, AVERAGE, and VLOOKUP

• Creating and formatting tables and charts

• Using conditional formatting and data validation

• Analyzing data using pivot tables and pivot charts

• Automating tasks with macros and formulas

NC machines are manually operated while CNC machines are automated.

• NC machines require manual input for each movement while CNC machines are programmed to perform movements automatically.

• CNC machines are more precise and efficient than NC machines.

• NC machines are cheaper than CNC machines.

• Examples of NC machines include drill presses and lathes while examples of CNC machines include milling machines and laser cutters.

Fluid mechanics is the study of fluids and their behavior under various conditions.

• It involves the study of fluid properties, such as density, viscosity, and pressure.

• It also includes the study of fluid flow, including laminar and turbulent flow.

• Applications of fluid mechanics include designing pumps, turbines, and aircraft wings.

• Examples of fluids include water, air, and oil.

• Fluid mechanics is used in various fields, including engineering, physics, and geology.

Yes, I am interested in testing related work and willing to work on both hardware and software.

• I have experience in testing both hardware and software components

• I am comfortable with using testing tools and techniques

• I am willing to learn and adapt to new technologies and processes

• I understand the importance of thorough testing in ensuring quality and reliability

• Examples: testing electronic devices, software applications, embedded systems

A pressure gauge is a device used to measure the pressure of a fluid or gas in a container or pipeline.

• It consists of a dial with a needle that indicates the pressure reading.

• There are different types of pressure gauges such as Bourdon tube, diaphragm, and capsule gauges.

• They are commonly used in industries such as oil and gas, manufacturing, and automotive.

• Pressure gauges are also used in medical equipment to measure blood pressure.

• Regular calibration is necessary to ensure ...read more

PPM can be found by dividing the weight of solute by the weight of solution and multiplying by 10^6.

• Determine the weight of the solute and the weight of the solution.

• Divide the weight of the solute by the weight of the solution.

• Multiply the result by 10^6 to get the PPM value.

• Example: If 1 gram of solute is dissolved in 1 million grams of solution, the PPM would be 1.

• PPM stands for parts per million and is used to express the concentration of a solution.

Capacitor stores electrical energy while varistor protects against voltage surges.

• Capacitor stores energy in an electric field while varistor is a voltage-dependent resistor.

• Capacitor is used in filters, tuning circuits, and energy storage while varistor is used in surge protection.

• Capacitor has two conductive plates separated by a dielectric while varistor has a ceramic or metal oxide material.

• Capacitor is polarized while varistor is non-polarized.

• Examples of capacitors incl...read more

G-codes are used to control the movement of the machine while M-codes are used to control the machine's functions.

• G-codes control the movement of the machine, such as its speed, direction, and position.

• M-codes control the machine's functions, such as turning on or off the spindle or coolant.

• G-codes are used more frequently than M-codes in CNC programming.

• Examples of G-codes include G00 for rapid positioning and G01 for linear interpolation.

• Examples of M-codes include M03 for ...read more

NRB stands for National Rehabilitation Board.

• NRB is an acronym for National Rehabilitation Board.

• The National Rehabilitation Board is a government organization responsible for the rehabilitation of persons with disabilities.

• NRB works towards creating an inclusive society by providing support and services to individuals with disabilities.

• Examples of NRB's initiatives include vocational training programs, accessibility improvements, and advocacy for disability rights.

A potentiometer is an electronic component that can vary the resistance in a circuit.

• It is commonly used to control the volume in audio equipment.

• It can also be used to adjust the brightness of a light or the speed of a motor.

• Potentiometers come in different types, including linear and logarithmic.

• They are often represented in circuit diagrams with the symbol of a resistor with an arrow pointing towards a wiper.

• Potentiometers can be single-turn or multi-turn, depending on the...read more

Tig and Mig welding are two different welding processes used in metal fabrication.

• Tig welding stands for Tungsten Inert Gas welding and uses a non-consumable tungsten electrode to create the weld.

• Mig welding stands for Metal Inert Gas welding and uses a consumable wire electrode to create the weld.

• Tig welding produces high-quality and precise welds, commonly used for thin materials and critical applications.

• Mig welding is faster and more suitable for thicker materials and hig...read more

Electric equipment for industrial areas

• Electric motors

• Transformers

• Generators

• Switchgear

• Control panels

• Lighting fixtures

• Cables and wires

• Power distribution systems

Production is the process of creating goods and services using resources and labor.

• Steel is made through a process called smelting, which involves heating iron ore with carbon to create a molten metal.

• The molten metal is then poured into molds to create various shapes and sizes of steel products.

• Different types of steel can be made by adding different alloys to the molten metal.

• The production of steel requires a lot of energy and resources, including iron ore, coal, and water...read more

Rectifier diagram converts AC to DC by removing negative half cycles.

• Rectifier circuit consists of diodes and transformer.

• AC voltage is applied to the transformer which steps down the voltage.

• Diodes are used to remove the negative half cycles of the AC voltage.

• The output obtained is a pulsating DC voltage which can be smoothed using a filter circuit.

• AC rectifier diagram includes half-wave and full-wave rectifiers.

• DC rectifier diagram includes center-tap and bridge rectifiers.

The Bernoulli theorem states that as the speed of a fluid increases, its pressure decreases.

• The Bernoulli theorem is a fundamental principle in fluid dynamics.

• It states that as the speed of a fluid increases, its pressure decreases.

• This principle is based on the conservation of energy in a flowing fluid.

• It is commonly used to explain the lift generated by an airplane wing or the flow of blood in arteries.

• The theorem is named after Daniel Bernoulli, a Swiss mathematician and p...read more

A rectifier is an electronic device that converts AC to DC.

• Rectifiers are used in power supplies to convert AC voltage to DC voltage.

• They are commonly used in electronic devices such as radios, televisions, and computers.

• There are two types of rectifiers: half-wave and full-wave.

• Half-wave rectifiers only allow half of the AC waveform to pass through, while full-wave rectifiers allow the entire waveform to pass through.

• Rectifiers can be made using diodes or other semiconductor...read more

Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

• Ohm's law is represented by the equation I = V/R, where I is the current, V is the voltage, and R is the resistance.

• It applies to conductors that are linear and have a constant temperature.

• Ohm's law is used in electrical engineering to calculate the current, voltage, or resistance in a circuit.

• For example, if the voltage across a resistor is 1...read more

A multimeter is a device used to measure electrical properties such as voltage, current, and resistance.

• A multimeter typically has a display screen, probes, and a dial or buttons to select the type of measurement.

• To measure voltage, the probes are connected to the circuit and the dial is set to the voltage range.

• To measure current, the multimeter is placed in series with the circuit and the dial is set to the current range.

• To measure resistance, the probes are connected to th...read more

Ohm's law formula is V = IR, where V is voltage, I is current, and R is resistance.

• Ohm's law relates voltage, current, and resistance

• The formula is V = IR

• V is voltage, I is current, and R is resistance

• It can be used to calculate any one of the three variables if the other two are known

A level gauge is a device used to measure the level of liquids or gases in a container.

• Consists of a glass or plastic tube with markings indicating the level of the substance

• May also include a magnetic float or a pressure sensor to measure the level

• Used in industries such as chemical, pharmaceutical, and oil and gas

• Examples include reflex, transparent, and magnetic level gauges

Cement making is the process of producing cement from raw materials like limestone, clay, and sand.

• Raw materials are crushed and mixed in the correct proportions

• The mixture is heated in a kiln to a temperature of about 1450°C

• The resulting material, called clinker, is ground into a fine powder

• Gypsum is added to the powder to regulate the setting time

• The final product is cement, which is used in construction

• Examples of cement types include Portland cement, white cement, and rap...read more

An adaptor is a device that allows different types of plugs or connectors to be used together.

• Adaptors are commonly used in electronics to convert one type of plug to another, such as from a European plug to a US plug.

• They can also be used in networking to connect different types of cables, such as Ethernet to USB.

• Adaptors can be passive (simply changing the physical connection) or active (converting signals or voltages).

A spanner is a tool used for tightening or loosening nuts and bolts.

• Spanners come in various sizes and shapes to fit different nuts and bolts.

• They are commonly made of metal, such as steel, for durability.

• Some spanners have a ratcheting mechanism for easier use.

• Examples include open-end spanners, ring spanners, and adjustable spanners.

Torque is a measure of the rotational force applied to an object.

• Torque is calculated by multiplying the force applied by the distance from the pivot point.

• It is measured in units such as Newton-meters (Nm) or foot-pounds (ft-lb).

• Torque is essential in understanding the effectiveness of tools like wrenches and screwdrivers.

• Higher torque allows for greater rotational force to be applied to an object.

• Examples of torque applications include tightening bolts, opening jars, and dr...read more

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

• Transformers are used to increase or decrease the voltage of an alternating current (AC) signal.

• They consist of two or more coils of wire, known as windings, that are wound around a core made of magnetic material.

• The primary winding receives electrical energy from a power source, while the secondary winding delivers the transformed energy to th...read more

Hzard and hirak are safety measures for electrical equipment.

• Hzard refers to the Hazardous Area Classification system used to identify the level of risk associated with electrical equipment in potentially explosive environments.

• Hirak refers to the Hirakawa Test Plug, a device used to test the electrical safety of equipment by simulating a fault condition.

• Both measures are important for ensuring the safety of personnel and equipment in electrical environments.

• For example, Hzar...read more