Jindal Steel and Power Electrical Foreman Interview Questions and Answers for Freshers

DC motors use direct current to generate rotational motion, while AC motors use alternating current.

• DC motors have a commutator and brushes to switch the current direction

• AC motors have a stator and rotor to create a rotating magnetic field

• DC motors are commonly used in household appliances and electric vehicles

• AC motors are commonly used in industrial machinery and HVAC systems

A thermocouple is a device that measures temperature by detecting the voltage difference between two different metals.

• Consists of two different metal wires joined at one end

• Produces a voltage that varies with temperature

• Used in temperature measurement and control systems

• Commonly used in industrial applications such as furnaces and boilers

The ohmic value of PT-100 is 100 ohms at 0°C.

• PT-100 is a type of platinum resistance thermometer.

• It has a resistance of 100 ohms at 0°C.

• The resistance increases with temperature at a rate of 0.385 ohms/°C.

• PT-100 is commonly used in industrial temperature measurement applications.

Calibration 3.0 and 5.0 refer to the accuracy level of a measuring instrument.

• Calibration 3.0 means the instrument has an accuracy level of 0.3% of the full scale reading.

• Calibration 5.0 means the instrument has an accuracy level of 0.5% of the full scale reading.

• The higher the calibration number, the more accurate the instrument is.

• Calibration is the process of adjusting an instrument to ensure its accuracy.

• Calibratio...read more

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

• Consists of primary and secondary coils

• Changes voltage levels (step-up or step-down)

• Used in power distribution systems

• Examples: power transformers, distribution transformers

CRO stands for Cathode Ray Oscilloscope, a device used to display and analyze the waveform of electrical signals.

• CRO is commonly used by electricians and engineers to troubleshoot electrical circuits.

• It displays voltage waveforms in real-time, allowing users to identify issues such as voltage spikes or distortions.

• CROs are essential tools for testing and measuring electronic equipment.

• Example: A CRO can be used to anal...read more

A motor is a device that converts electrical energy into mechanical energy to produce motion.

• Motors are commonly used in various applications such as industrial machinery, household appliances, and vehicles.

• There are different types of motors including AC motors, DC motors, and servo motors.

• Motors consist of a rotor and a stator, with the rotor rotating when electrical current is applied.

• Examples of motors include elec...read more

Improving power factor helps in reducing energy losses, increasing system efficiency, and reducing electricity costs.

• Improving power factor reduces the amount of reactive power flowing in the system, which in turn reduces energy losses.

• Higher power factor means more efficient use of electricity and less strain on the electrical system.

• Improving power factor can lead to reduced electricity costs for consumers and utilit...read more

Buccholz relay is a protective device used in oil-filled transformers to detect faults such as internal arcing or overheating.

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

• It works based on the principle that gas is generated when a fault occurs in the transformer, causing oil level to drop and gas to accumulate in the relay.

• The relay consists of two float switches - o...read more

DP in Siemens communication stands for Distributed Peripherals.

• DP is a communication protocol used by Siemens for connecting distributed peripherals to a central control system.

• It allows for real-time data exchange between the peripherals and the control system.

• DP is commonly used in industrial automation applications.

• Examples of DP communication modules include DP/DP couplers and DP slaves.

To communicate S7 PLC and ABB drive using Profibus, you need to configure the Profibus network, set up the communication parameters, and establish the communication link.

• Configure the Profibus network by setting the correct baud rate, address, and other network parameters.

• Set up the communication parameters on both the S7 PLC and ABB drive to ensure they are compatible with each other.

• Establish the communication link b...read more