Rajdeep Automation Senior Design Engineer Interview Questions and Answers

Circuit breakers are of different types based on their voltage levels, construction, and applications.

• Based on voltage levels: low voltage, medium voltage, and high voltage circuit breakers

• Based on construction: air circuit breakers, oil circuit breakers, vacuum circuit breakers, and SF6 circuit breakers

• Based on applications: residential, commercial, and industrial circuit breakers

• Other types: molded case circuit break...read more

The Power & Control Circuit of Star Delta Feeder is a common circuit used in electrical engineering.

• The circuit consists of a power circuit and a control circuit.

• The power circuit includes a three-phase AC motor, a contactor, and overload relays.

• The control circuit includes a timer, a contactor, and a push button station.

• The circuit is used to reduce the starting current of the motor.

• During starting, the motor is conne...read more

Eplan Electric allows generating various reports for electrical design projects.

• Reports can be generated for bills of materials, cable lists, terminal diagrams, and more.

• Reports can be customized to include specific information and formatting.

• Reports can be exported in various file formats, including Excel, PDF, and XML.

• Reports can be generated for individual pages or for the entire project.

• Reports can be scheduled to ...read more

MCB stands for Miniature Circuit Breaker and MCCB stands for Molded Case Circuit Breaker. They are used for electrical protection.

• MCB is a type of circuit breaker that automatically switches off electrical circuits during abnormal conditions such as overload or short circuit.

• MCCB is a type of circuit breaker that provides protection against overloads, short circuits, and ground faults.

• MCBs are commonly used in resident...read more

Gear ratio is the ratio of the number of teeth on the driving gear to the number of teeth on the driven gear.

• Gear ratio determines the speed and torque relationship between two gears.

• It is calculated by dividing the number of teeth on the driving gear by the number of teeth on the driven gear.

• A gear ratio greater than 1 indicates a reduction in speed and an increase in torque, while a ratio less than 1 indicates an inc...read more

The symbol of first angle method is a triangle with the vertex pointing downwards. The symbol of third angle method is a triangle with the vertex pointing upwards.

• First angle method is commonly used in Europe and Asia while third angle method is commonly used in North America.

• In first angle method, the object is placed in the first quadrant while in third angle method, the object is placed in the third quadrant.

• The sym...read more

The K factor is a value used in sheet metal design to determine the amount of springback that occurs during bending.

• The K factor is a ratio that relates the neutral axis to the material thickness.

• It is used to calculate the bend allowance and bend deduction in sheet metal bending operations.

• A higher K factor indicates more springback, while a lower K factor indicates less springback.

• Different materials and bending proc...read more

Spring back effect is the tendency of a material to return to its original shape after being deformed.

• Spring back effect occurs when a material is bent or stretched and then released, causing it to return to its original shape.

• It is commonly observed in materials like metals and polymers.

• The amount of spring back depends on the material's elasticity and the magnitude of the deformation.

• Spring back can be a desirable or...read more

Machining operations involve using various tools and techniques to shape and cut raw materials into the desired shape and size.

• The job may involve using lathes, milling machines, grinders, or other specialized equipment.

• The machinist must carefully measure and mark the material before cutting or shaping it.

• The machinist may need to use different cutting tools or techniques depending on the material being worked on.

• Exam...read more

There are various types of gearboxes including spur, helical, bevel, worm, planetary, and cycloidal.

• Spur gearboxes have straight teeth and are the simplest type.

• Helical gearboxes have angled teeth and are quieter than spur gearboxes.

• Bevel gearboxes are used for changing the direction of power transmission.

• Worm gearboxes have a screw-like gear and are used for high reduction ratios.

• Planetary gearboxes have multiple gear...read more

Power and control wiring of star delta starter involves connecting the motor to the power supply and control circuit using a specific wiring diagram.

• Power wiring involves connecting the three-phase power supply to the motor through the main contactor.

• Control wiring involves connecting the control circuit to the motor through the timer and the star-delta contactor.

• During starting, the motor is connected in star configur...read more