NBTC GROUP Electrical Supervisor Interview Questions and Answers

Star-Delta starter is used to start 3-phase motors. It reduces the starting current and torque.

• Star-Delta starter connects the motor in star configuration during starting to reduce the starting current and torque.

• After a few seconds, the starter switches the motor to delta configuration for normal operation.

• This method is used for motors with high starting current and torque requirements.

• It is commonly used in industri...read more

DOL starter is a direct-on-line starter used to start 3-phase motors by connecting them directly to the power supply.

• DOL starter provides full voltage to the motor at the start

• It consists of a contactor, overload relay, and start/stop push buttons

• The contactor connects the motor to the power supply

• The overload relay protects the motor from overloading

• The start/stop push buttons control the on/off function of the motor

The unit of Energy is Joule (J)

• The unit of Energy is Joule (J)

• Energy can also be measured in kilowatt-hours (kWh)

• 1 Joule is equal to 1 watt-second

The unit of resistance is Ohm (Ω).

• The unit of resistance is represented by the symbol Ω (Ohm).

• Resistance is measured in Ohms, named after the German physicist Georg Simon Ohm.

• One Ohm is equal to one volt per ampere (1 Ω = 1 V/A).

The unit of current is Ampere (A)

• The unit of current is Ampere (A)

• Current is the flow of electric charge in a circuit

• 1 Ampere is equivalent to 1 Coulomb per second

• Current is measured using an ammeter

The unit of capacitance is Farad (F)

• The unit of capacitance is named after Michael Faraday

• 1 Farad is equal to 1 Coulomb per Volt

• Common multiples of Farad include microfarad (uF) and picofarad (pF)

The unit of power is the watt (W)

• The unit of power is the watt (W)

• Power is the rate at which work is done or energy is transferred

• 1 watt is equal to 1 joule per second

• Common examples of power units include kilowatts (kW) and horsepower (hp)

The unit of power is the watt (W).

• The unit of power is the watt (W)

• Power is the rate at which work is done or energy is transferred

• 1 watt is equal to 1 joule per second

• Common examples of power units include kilowatts (kW) and horsepower (hp)

The unit of current is Ampere (A), which measures the rate of flow of electric charge.

• The unit of current is Ampere (A)

• Current is the rate of flow of electric charge

• Commonly represented by the symbol 'I'

• 1 Ampere is equivalent to 1 Coulomb per second

PE80 and PE100 are both types of polyethylene pipes used for gas and water supply, but differ in their pressure ratings and material properties.

• PE80 has a lower maximum operating pressure than PE100

• PE100 has a higher density and is more resistant to stress cracking than PE80

• PE100 is typically used for higher pressure applications such as gas distribution

• PE80 is typically used for lower pressure applications such as wat...read more

A service regulator is a device that controls the pressure of gas or liquid flowing through a pipeline.

• Service regulators are used in industries such as oil and gas, chemical, and pharmaceuticals.

• They can be classified into two types: single-stage and two-stage regulators.

• Single-stage regulators are used for low-pressure applications, while two-stage regulators are used for high-pressure applications.

• Examples of servic...read more

Commissioning procedure involves testing and verifying the functionality of newly installed equipment or systems.

• Develop a commissioning plan

• Verify installation and perform functional testing

• Document and resolve any issues

• Train operators and maintenance personnel

• Obtain acceptance from stakeholders

• Examples: commissioning a new HVAC system, commissioning a new power plant

DCS stands for Distributed Control System, used to control and monitor industrial processes.

• DCS is a computerized control system used in industries to control and monitor various processes.

• It consists of a network of controllers, sensors, and actuators that communicate with each other to control the process.

• DCS allows for centralized control and monitoring of multiple processes from a single location.

• It is commonly use...read more

DRS stands for Decision Review System, a technology used in cricket to review umpiring decisions.

• DRS allows teams to challenge umpiring decisions made on the field.

• It involves the use of technology such as ball-tracking and ultra-edge to determine the accuracy of decisions.

• Each team is allowed a limited number of unsuccessful challenges per innings.

• DRS has been a controversial topic in cricket due to its perceived inco...read more