Jindal Stainless Assistant Electrical Engineer Interview Questions and Answers

Ductile iron is a type of cast iron that contains graphite in the form of nodules, making it more flexible and durable.

• Ductile iron is also known as nodular cast iron or spheroidal graphite iron.

• It is made by adding small amounts of magnesium or cerium to molten iron, which causes the graphite to form nodules instead of flakes.

• This gives ductile iron its unique properties of high strength, toughness, and ductility.

• It i...read more

A lance is a long, pointed weapon used in medieval warfare.

• Lances were typically made of wood or metal.

• They were used by knights on horseback to charge at their enemies.

• The length of a lance varied, but it was usually between 9 and 14 feet long.

• Lances were often decorated with banners or flags to identify the knight carrying it.

• The use of lances declined with the advent of firearms in warfare.

Tilt drive is a mechanism used in construction to tilt heavy objects or structures.

• Tilt drive is commonly used in the construction of bridges, buildings, and large machinery.

• It involves the use of hydraulic cylinders or motors to tilt the object or structure.

• The tilt drive system must be carefully designed and engineered to ensure safety and stability.

• Proper maintenance and inspection of the tilt drive system is crucia...read more

ID fan stands for Induced Draft fan which is used to create negative pressure in a boiler.

• ID fan is used to draw flue gases from the furnace and exhaust them to the atmosphere.

• It helps in maintaining the proper flow of air and gases in the boiler.

• ID fan is typically installed at the outlet of the boiler.

• It is driven by an electric motor or steam turbine.

• The size and capacity of ID fan depend on the size of the boiler a...read more

Bernoulli theorem is a principle that describes the relationship between fluid speed and pressure.

• States that as the speed of a fluid increases, the pressure within the fluid decreases

• Used to explain the lift force generated by an airplane wing

• Applicable to both incompressible and compressible fluids

Bearings are used to reduce friction between two moving parts. There are different types of bearings and each requires specific maintenance.

• Types of bearings include ball bearings, roller bearings, plain bearings, and fluid bearings.

• Ball bearings are the most common type and require regular lubrication.

• Roller bearings are used for heavy loads and require periodic cleaning and lubrication.

• Plain bearings are simple and r...read more

Design of gears involves selecting appropriate gear type, size, material, and tooth profile for efficient power transmission.

• Gears are used to transmit power and motion between two rotating shafts.

• The gear type and size are selected based on the required speed ratio and torque.

• The material selection depends on the application and operating conditions.

• The tooth profile is designed to ensure smooth and efficient power tr...read more

Bearings are mechanical components that reduce friction between moving parts and support axial and radial loads.

• Bearings work by allowing two surfaces to roll or slide over each other with minimal friction.

• They are designed to support loads in a specific direction, such as radial or axial.

• There are several types of bearings, including ball bearings, roller bearings, and plain bearings.

• Ball bearings use balls to reduce ...read more

Safety refers to the condition of being protected from harm, danger, or injury.

• Safety involves taking precautions to prevent accidents or injuries

• It includes following safety guidelines and procedures

• Safety is important in all aspects of life, including work, home, and leisure activities

• Examples of safety measures include wearing protective gear, using safety equipment, and practicing safe behaviors

• Safety is a shared r...read more

Composite error and ratio error are two types of errors in current transformers.

• Composite error is the combination of ratio error and phase angle error in a current transformer.

• Ratio error is the difference between the actual turns ratio and the specified turns ratio of a current transformer.

• Phase angle error is the angular difference between the primary and secondary currents of a current transformer.

• Composite error a...read more

An AC drive circuit diagram controls the speed of an AC motor by varying the frequency and voltage of the power supplied to it.

• An AC drive consists of a rectifier, DC link, inverter, and control circuitry.

• The rectifier converts AC power to DC power, which is stored in the DC link.

• The inverter converts the DC power back to AC power with variable frequency and voltage.

• The control circuitry adjusts the frequency and volta...read more

A single line diagram of a distribution system is required with proper specifications.

• The diagram should show the flow of power from the source to the load

• It should include all components such as transformers, switchgear, and cables

• The specifications should include voltage levels, power ratings, and protection devices

• The diagram should follow standard symbols and conventions

• Example: A 11 kV distribution system with a 5

Dewpoint test is done in transformer to check the moisture content in the insulation oil.

• Moisture in insulation oil can cause breakdown of transformer insulation

• Dewpoint test helps to determine the moisture content in the oil

• It is a preventive maintenance measure to avoid transformer failure

• The test involves cooling a mirror until dew forms on it, and measuring the temperature at which dew forms

Power transformers are used in transmission systems to step up or down voltage, while distribution transformers are used in distribution systems to step down voltage.

• Power transformers are used in high voltage transmission systems to step up or down voltage for long distance transmission.

• Distribution transformers are used in low voltage distribution systems to step down voltage for local distribution.

• Power transformers...read more

Buchholz relay is used to protect transformers from faults by detecting gas and oil flow abnormalities.

• Buchholz relay is installed in the pipe connecting the transformer tank and conservator tank.

• It operates based on the principle that faults in the transformer generate gases and cause oil flow disturbances.

• When gas or oil flow abnormalities occur, the relay trips and sends a signal to the control panel to isolate the ...read more