Lloyd Electric & Engineering Electrical Engineer Interview Questions and Answers

Q1. A 22 kw AOP motor CT cable burn again and again what is the reason ?
Ans. 
The repeated burning of a 22 kW AOP motor CT cable may be due to overloading, short circuits, poor insulation, or incorrect cable sizing.
• Check for overloading of the motor causing excessive heat in the cable

• Inspect for short circuits in the motor or the wiring

• Ensure proper insulation of the cable to prevent overheating

• Verify if the cable size is appropriate for the motor's power requirements
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Q2. When CT of AOP motor is bypassed then what effect on the motor ?
Ans. 
Bypassing the CT of an AOP motor can lead to overcurrent and damage to the motor.
• Bypassing the CT can result in the motor drawing excessive current.

• This can lead to overheating of the motor windings.

• Overcurrent can cause damage to the motor components.

• It can also pose a safety risk due to potential electrical faults.
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Q1. What is the use of RTD and TC ?
Ans. 
RTD and TC are used for temperature measurement in various industries.
• RTD stands for Resistance Temperature Detector and TC stands for Thermocouple.

• RTD measures temperature by sensing the change in resistance of a metal wire as temperature changes.

• TC measures temperature by sensing the voltage generated by the junction of two dissimilar metals.

• RTD is more accurate and stable than TC, but TC is more rugged and can measu...read more
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Q2. Which type of drives are used in ID fan motor and cooler motor?
Ans. 
Variable frequency drives (VFDs) are used in ID fan motor and cooler motor.
• VFDs are used to control the speed of the motor and save energy.

• ID fan motor and cooler motor require different speeds at different times, which can be achieved through VFDs.

• VFDs can also protect the motor from damage due to overvoltage or undervoltage.

• Examples of VFDs include ABB ACS880, Siemens Sinamics G120, and Schneider Electric Altivar Pro
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Q1. What is cable? And its working
Ans. 
Cable is a conductor used to transmit electrical signals or power from one point to another.
• Cable is made up of one or more conductors, typically copper or aluminum, surrounded by insulation material.

• It is used to connect electrical devices, such as appliances, to power sources.

• Different types of cables include power cables, communication cables, and fiber optic cables.

• Cables are designed to carry specific types of sig...read more
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Q2. What is harness and their defect?
Ans. 
A harness is a collection of wires or cables bound together to transmit signals or electrical power. Common defects include fraying, corrosion, and loose connections.
• A harness is used to organize and protect wires or cables in electrical systems.

• Defects in a harness can include fraying of wires, corrosion of connectors, and loose connections.

• Regular inspection and maintenance of harnesses are important to prevent elect...read more
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Q3. What is 5s and their benfit
Ans. 
5S is a methodology used to organize and maintain a clean, efficient, and safe work environment.
• Sort - separate necessary items from unnecessary items

• Set in order - organize necessary items in a logical manner

• Shine - clean and inspect work area regularly

• Standardize - establish guidelines and procedures for maintaining the first 3 S's

• Sustain - ensure the 5S system is continuously implemented and improved

• Benefits include...read more
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Q4. What is tpm & working
Ans. 
TPM stands for Total Productive Maintenance, a proactive approach to maintenance that aims to maximize equipment effectiveness.
• TPM involves getting everyone in the organization involved in maintenance activities

• It focuses on preventing breakdowns and improving overall equipment efficiency

• TPM includes activities such as autonomous maintenance, planned maintenance, and focused improvement

• Example: Regularly scheduled equi
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Technical aptitude related to wiring, symbol identify, software related

Q1. EPLAN software macros type, Report generation, Black up, restore process, black box, structure box, Q2: Heat load calculation Q3: RFQ Full form process Q4: Switchgear selection Q5: MCB type, working.
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Q1. EPLAN software Version, AutoCAD software
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Q2. Work pressure handling capacity
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Q1. What is the synchronisation process of plant ?
Ans. 
Synchronisation process of a plant involves matching the frequency, voltage, and phase angle of the incoming generator with the grid.
• Ensure the generator frequency matches the grid frequency (50Hz or 60Hz).

• Match the voltage levels of the generator with the grid.

• Adjust the phase angle of the generator to synchronize with the grid.

• Use synchronizing equipment like synchroscope or synchronizing lamps to ensure proper synch...read more
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Q2. Brief discussion about alternator and transformer protection system ?
Ans. 
Alternator and transformer protection systems are essential for preventing damage and ensuring safe operation.
• Alternator protection systems typically include overcurrent, overvoltage, and reverse power protection to safeguard the alternator from damage.

• Transformer protection systems often involve differential protection, overcurrent protection, and temperature monitoring to prevent overheating and insulation breakdown.

• ...read more
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Q1. Introduction about Myself
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Q1. Technical questions
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Q1. Related your experience and working areas
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Q1. Industrial safety
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Q1. Question asking from synchronisation process.
Ans. First off all wait for TG rated speed =check ready for excitation in avr panel=press excitation on button in avr panel=select breaker for synchronisation=select sync. on=select synchronisation mode in manual= adjust voltage and frequency= select synchronisation in auto mode
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