ISMT Electrical Engineer Interview Questions and Answers

The single line diagram of the plant I am working at shows the electrical connections and components in a simplified manner.

• The single line diagram typically includes power sources, distribution lines, transformers, circuit breakers, and loads.

• It provides a high-level overview of the electrical system without showing the physical location of each component.

• Symbols are used to represent different electrical components a...read more

Power factor is the ratio of real power to apparent power in an AC circuit. VFD stands for Variable Frequency Drive. AC motors run on alternating current while DC motors run on direct current.

• Power factor is a measure of how effectively electrical power is being used in a circuit.

• It is calculated by dividing the real power (in watts) by the apparent power (in volt-amperes).

• A power factor of 1 indicates that all the pow...read more

Types of load cells include strain gauge load cells, hydraulic load cells, and capacitive load cells.

• Strain gauge load cells measure the strain or deformation of a material.

• Hydraulic load cells use hydraulic fluid to measure force.

• Capacitive load cells measure changes in capacitance to determine force.

• Other types of load cells include piezoelectric load cells and pneumatic load cells.

Different types of protection are used in a substation to ensure safety and reliability.

• Overcurrent protection: Protects against excessive current flow.

• Overvoltage protection: Safeguards against high voltage surges.

• Differential protection: Detects faults by comparing currents entering and leaving the substation.

• Distance protection: Protects transmission lines based on the distance to the fault.

• Ground fault protection: ...read more

Different types of HT breakers are used in HT lines depending on the specific requirements.

• Air Circuit Breaker (ACB) is commonly used in HT lines for its high breaking capacity and quick response time.

• Vacuum Circuit Breaker (VCB) is another popular choice due to its compact size and low maintenance requirements.

• SF6 Circuit Breaker is used for high voltage applications as it provides excellent arc quenching properties.

• O...read more

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