JSW Group Electrician Interview Questions and Answers

Reverse forward with drive is a control method used in electrical systems to change the direction of rotation of a motor.

• Reverse forward with drive is achieved by using a motor controller that can switch the polarity of the motor's power supply to change its direction of rotation.

• This method is commonly used in applications where the motor needs to be able to run in both forward and reverse directions, such as in conve...read more

Power and control wiring of EOT crane involves connecting electrical components to ensure proper functioning.

• Power wiring includes connecting the main power supply to the crane motor and other electrical components.

• Control wiring involves connecting control devices such as push buttons, limit switches, and relays to control the movement of the crane.

• Proper labeling and color-coding of wires is essential for easy troubl...read more

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

Various methods exist to measure motor RPM, including tachometers, frequency counters, and optical sensors.

• Tachometer: A device that directly measures the rotational speed of the motor shaft.

• Frequency Counter: Measures the frequency of the motor's output signal, which can be converted to RPM.

• Optical Sensor: Uses light beams to detect the rotation of a marked disk attached to the motor.

• Stroboscope: A flashing light that...read more

Safety devices in conveyor systems prevent accidents and ensure smooth operation, protecting both workers and equipment.

• Emergency Stop Buttons: Allow immediate shutdown of the conveyor in case of an emergency.

• Safety Guards: Physical barriers that prevent access to moving parts, reducing the risk of injury.

• Photoelectric Sensors: Detect objects or personnel in the conveyor's path, stopping operation if necessary.

• Overload...read more

The negative charge of an ESP system electrode helps in attracting and collecting particulate matter from flue gases.

• Electrostatic Precipitators (ESPs) use negatively charged electrodes to ionize particles in the gas stream.

• The negative charge creates an electric field that attracts positively charged particles, aiding in their collection.

• For example, in power plants, ESPs remove ash and other pollutants from exhaust g...read more

Healthy silica gel is typically blue or orange, while unhealthy silica gel turns pink or green, indicating moisture absorption.

• Healthy silica gel is often blue or orange, indicating it is dry.

• Unhealthy silica gel turns pink or green when it absorbs moisture.

• Blue silica gel contains cobalt chloride, which changes color when wet.

• Orange silica gel is a safer alternative that changes from orange to green when saturated.