Sobha Engineering Contracting Electrician Interview Questions and Answers

Q1. Family background
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Q2. Tell me about yourself
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Q3. What's your salary expectation
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Q1. What is speed difference between stator's rotating magnetic field and rotor's rmf?
Ans. 
The speed difference between stator's rotating magnetic field and rotor's rmf is called slip.
• The slip is necessary for inducing current in the rotor and producing torque.

• The slip is typically around 1-3% in most induction motors.

• Higher slip values can indicate issues with the motor such as overload or mechanical problems.
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Q2. What is induction motor
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An induction motor is a type of AC motor where power is supplied to the rotor by electromagnetic induction.
• Induction motors are commonly used in various applications such as industrial machinery, pumps, fans, and compressors.

• They do not require brushes to transfer power to the rotor, making them more reliable and maintenance-free compared to brushed DC motors.

• The speed of an induction motor is determined by the frequen...read more
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Q3. What is synchronisation
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Synchronisation is the process of coordinating multiple systems or devices to work together in harmony.
• Synchronisation ensures that different components or processes are aligned in time.

• It is commonly used in electrical systems to ensure that multiple generators are running in phase with each other.

• In data communication, synchronisation is important for ensuring that data is transmitted and received at the correct timi...read more
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Q4. What is the speed of a rotor with respect to the stator magnetic field in an induction motor?
Ans. 
The speed of a rotor with respect to the stator magnetic field in an induction motor is known as slip speed.
• The slip speed is the difference between the synchronous speed of the rotating magnetic field in the stator and the actual speed of the rotor.

• It is necessary for the rotor to operate at a speed slightly slower than the synchronous speed in order to induce current and generate torque.

• The slip speed allows the roto...read more
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Q5. What is slip? Per unit slip?
Ans. 
Slip is the difference between synchronous speed and actual rotor speed in an induction motor. Per unit slip is the slip expressed as a fraction of synchronous speed.
• Slip is the difference between synchronous speed (speed of the rotating magnetic field) and the actual rotor speed in an induction motor.

• Per unit slip is the slip expressed as a fraction of synchronous speed, typically denoted as a percentage.

• For example, ...read more
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Electrician test and all questions

Q1. 2 way wairing And all electrical work
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Q2. 2 way and light and wairing and Earth and all
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Q3. Electrical all questions
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Q1. Electrical mentenanc work experience
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Q2. ElCB full form and MCB full form
Ans. 
ELCB stands for Earth Leakage Circuit Breaker and MCB stands for Miniature Circuit Breaker.
• ELCB is a safety device used to protect against electrical shock caused by earth faults.

• MCB is a type of circuit breaker that automatically switches off electrical circuits during abnormal conditions.

• ELCB detects current leakage to earth and disconnects the circuit, while MCB protects against overloads and short circuits.
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Q3. Earth leakeg circuit breaker and menutur current breaker
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Q4. ElCB sefty protection
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Q5. MCB over load protection
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MCB (Miniature Circuit Breaker) provides overload protection by automatically switching off the circuit when current exceeds the rated capacity.
• MCB trips when current exceeds its rated capacity to prevent overheating and potential fire hazards.

• Overload protection is essential to protect electrical appliances and wiring from damage.

• Examples of MCB overload protection include tripping when too many devices are connected ...read more
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Q6. ElCB earth leakage protection
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Q1. Plc working and shefty
Ans. When the power goes off the machine switches off automatically.this requires you restart the machine, when the power is back
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Q2. Electrical VPR Settings
Ans. Electrical panel is provided with VPR for protection during under voltage and over voltage . This voltage protection relay is characterized by its trip interval of 0.2to 10 second.
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Q3. Electrical panel with braking system
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An electrical panel with a braking system is a safety feature that automatically stops the flow of electricity in case of an emergency or malfunction.
• The braking system in an electrical panel is designed to prevent electrical accidents and protect both people and equipment.

• It works by detecting abnormal conditions such as short circuits, overloads, or ground faults, and immediately cutting off the power supply.

• This hel...read more
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Q1. Right hand rool .
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Q2. Left hand rool
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Q1. All about of electrical safety and work
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Q2. All work of electrical basic like how to test mager, maltimeter,elcb tester,clamp meter,also earthing tester
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Q1. About swich yard
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Q2. About vfd panal and star delta motars
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Q3. About Earthing and electrod
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Q4. About Earthing Matt by G.I. flats
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Q5. About construction power
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Q6. About baching plant
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