Gujarat State Fertilizers & Chemicals Deputy Manager Maintenance Interview Questions, Process, and Tips

75 question of simple aptitude and technical

Q1. What is induction machine
Ans. 
An induction machine is an AC electric motor in which the electric current in the rotor needed to produce torque is induced by electromagnetic induction from the magnetic field of the stator winding.
• Induction machines are commonly used in various industrial applications for their simplicity, reliability, and low maintenance requirements.

• They operate on the principle of electromagnetic induction, where a rotating magnet...read more
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Q2. What is generator
Ans. 
A generator is a device that converts mechanical energy into electrical energy.
• Generators are commonly used as backup power sources during power outages.

• They can be powered by various sources such as gasoline, diesel, natural gas, or renewable energy sources like solar or wind.

• Generators come in different sizes and capacities to meet different power needs.

• They consist of an engine, alternator, fuel system, voltage regu...read more
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Q3. Why voltage rating in multiple of 11
Ans. 
Voltage rating in multiples of 11 is common due to historical reasons and practical considerations.
• Historically, early power systems used 110V and 220V as standard voltages.

• Multiples of 11 make it easier to design transformers and other electrical equipment.

• Standardizing on multiples of 11 simplifies the distribution and transmission of power.

• Common voltage ratings like 110V, 220V, 440V, etc., are all multiples of 11.
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Q4. How speed control of ac machine work
Ans. 
Speed control of an AC machine is achieved by varying the frequency of the input power supply.
• Speed control is typically done using a variable frequency drive (VFD) which adjusts the frequency of the input power to the motor.

• By increasing or decreasing the frequency, the motor speed can be controlled without changing the number of poles in the motor.

• For example, in an industrial setting, a VFD may be used to control th...read more
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Q5. What is lighting impluse test of Power transformer
Ans. 
Lightning impulse test of a power transformer is a high voltage test to simulate lightning strikes and ensure the transformer can withstand sudden voltage surges.
• It is a high voltage test conducted to simulate lightning strikes on the transformer

• The test is performed to ensure the transformer can withstand sudden voltage surges

• It helps in evaluating the insulation strength and overall performance of the transformer

• The ...read more
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Q6. Why 650kvp for lighting impluse level for 132kv
Ans. 
650kVp is chosen for lighting impulse level for 132kV due to its ability to withstand lightning strikes and protect the equipment.
• 650kVp is a standard value chosen based on the insulation level required for 132kV systems

• Lightning impulse level is selected to ensure equipment can withstand lightning strikes without damage

• Higher impulse levels provide better protection against lightning-induced surges

• Choosing the right i...read more
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Q7. What is heat run test of transformer
Ans. 
Heat run test of transformer is a test conducted to assess the performance of a transformer under normal operating conditions.
• Heat run test involves running the transformer at full load for a specified period of time to evaluate its temperature rise.

• The test helps in determining if the transformer can handle the heat generated during normal operation without overheating.

• It is essential to ensure that the transformer ca...read more
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