Welspun Corp Electrician Interview Questions and Answers for Experienced

Q1. What methods can be used to determine the RPM of a motor?
Ans. 
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
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Q2. What are the safety device system of a conveyor line?
Ans. 
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
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Q3. What is negative charge of Esp system electrode?
Ans. 
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
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Q4. What is colour of healthy and unhealthy silica gel?
Ans. 
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.
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Work and time, reasoning,essay

Q1. What is your name and age
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Q2. Tell me something about yourself
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Q1. Working of reverse forward with drive .
Ans. 
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
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Q2. Power and control wiring of EOT crane.
Ans. 
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
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Q1. What is interested for you in this company.
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Q1. Unit of resistance
Ans. 
Ohm
• Unit of resistance in electrical circuits

• Symbol is Ω (omega)

• Named after German physicist Georg Simon Ohm

• Measured using an ohmmeter
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Q2. Unit of current
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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 equal to 1 Coulomb per second

• Commonly used prefixes for current are milliampere (mA) and microampere (μA)
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