Cognizant Diploma Electrical Engineer Interview Questions and Answers

Q1. Basic electrical engineering question
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Q1. Basic computer knowledge
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Q1. Explain the solar energy
Ans. 
Solar energy is the energy derived from the sun's radiation, which can be converted into electricity or used for heating purposes.
• Solar energy is renewable and sustainable, making it an environmentally friendly energy source.

• Solar panels are used to capture sunlight and convert it into electricity through the photovoltaic effect.

• Solar energy can be used for various applications such as powering homes, businesses, and e...read more
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Q2. Explain the solar power plant
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A solar power plant is a facility that converts sunlight into electricity using photovoltaic panels or mirrors to concentrate solar energy.
• Solar panels or mirrors capture sunlight and convert it into electricity through the photovoltaic effect

• The electricity generated can be used to power homes, businesses, or even entire cities

• Solar power plants can be either photovoltaic (PV) or concentrated solar power (CSP) systems

• ...read more
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Q3. Explain the solar energy translation and distribution
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Solar energy is converted into electricity through photovoltaic cells and then distributed through a grid system.
• Solar energy is captured by solar panels, which contain photovoltaic cells that convert sunlight into electricity.

• The electricity generated is then fed into an inverter, which converts it from direct current (DC) to alternating current (AC) for use in homes and businesses.

• The AC electricity is then distribut...read more
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Q4. Explain the solar power plant maintenance
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Solar power plant maintenance involves regular cleaning of panels, inspection of components, and monitoring of performance.
• Regularly clean solar panels to remove dirt and debris that can reduce efficiency

• Inspect components such as inverters, wiring, and batteries for any signs of wear or damage

• Monitor performance metrics like energy output and system efficiency to identify any issues early

• Schedule regular maintenance c...read more
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Q1. What is the another name of induction motor
Ans. 
Another name for induction motor is asynchronous motor.
• Asynchronous motor is commonly used in industrial applications.

• It operates at a slightly slower speed than the synchronous speed.

• Examples include squirrel cage induction motor and wound rotor induction motor.
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Q2. What motor run at high speed at no load conditions
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Induction motors run at high speed at no load conditions
• Induction motors

• Asynchronous motors

• Squirrel cage motors
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Q3. What is exciter
Ans. 
An exciter is a device that supplies the field current to the rotor winding of a synchronous machine.
• Supplies field current to the rotor winding

• Helps in generating the magnetic field in the rotor

• Essential component in synchronous machines

• Can be either brushless or brush type

• Examples include static exciter and rotating exciter
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Q1. Why we cannot operate transformer in dc supply
Ans. 
Transformers cannot operate on DC supply due to the absence of changing magnetic field required for induction.
• Transformers work on the principle of electromagnetic induction, which requires a changing magnetic field.

• DC supply produces a constant magnetic field, which does not induce a voltage in the secondary coil of the transformer.

• AC supply, on the other hand, produces a changing magnetic field, allowing for inductio...read more
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Q1. Why we cannot measured transformer in kw
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Transformers cannot be measured in kW because they do not consume power, they only transfer it.
• Transformers do not have any moving parts or internal power losses, so they do not consume power themselves

• The power rating of a transformer is given in kVA (kilovolt-amperes) which represents the maximum amount of power it can transfer

• The power factor of the load connected to the transformer determines the actual power in kW
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