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10+ Balaji Home Appliances Vidyaranyapura Interview Questions and Answers

Updated 28 Feb 2025

Q1. Difference between internal and external combustion engines and examples for each of them

Ans.

Internal combustion engines burn fuel inside the engine while external combustion engines burn fuel outside the engine.

  • Internal combustion engines are commonly used in cars, motorcycles, and airplanes.

  • External combustion engines are less common and include steam engines and Stirling engines.

  • Internal combustion engines are more efficient and powerful than external combustion engines.

  • External combustion engines are typically quieter and produce less pollution than internal comb...read more

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Q2. Difference between synchronous motor and slipring induction motor

Ans.

Synchronous motors rotate at a fixed speed while slipring induction motors have variable speed.

  • Synchronous motors have a constant speed and require an external power source to start

  • Slipring induction motors have a variable speed and can start on their own

  • Synchronous motors are used in applications where constant speed is required, such as in clocks and timers

  • Slipring induction motors are used in applications where variable speed is required, such as in conveyor belts and elev...read more

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Q3. Relation between back emf,speed and poles in DC motor

Ans.

Back EMF is directly proportional to speed and number of poles in a DC motor.

  • Back EMF is generated in the opposite direction to the applied voltage.

  • As the motor speeds up, the back EMF increases.

  • The number of poles in the motor determines the frequency of the back EMF.

  • More poles result in a higher frequency and a smoother rotation.

  • Back EMF is used to control the speed of the motor.

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Q4. Relation between speed,frequency and pole between 3-phase induction motor

Ans.

Speed, frequency and number of poles are interrelated in a 3-phase induction motor.

  • The speed of the motor is directly proportional to the frequency of the power supply.

  • The number of poles in the motor determines the speed at which it operates.

  • For a given frequency, the speed of the motor decreases as the number of poles increases.

  • For a given number of poles, the speed of the motor increases as the frequency of the power supply increases.

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Q5. Difference between slipring and squirrel cage induction motor

Ans.

Slipring and squirrel cage induction motors differ in their rotor construction and starting torque.

  • Slipring motor has a wound rotor with slip rings and brushes while squirrel cage motor has a simple rotor with bars and end rings.

  • Slipring motor has high starting torque and can be used for heavy loads while squirrel cage motor has low starting torque and is suitable for light loads.

  • Slipring motor can be controlled by varying the resistance in the rotor circuit while squirrel ca...read more

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Q6. Do you play any game?

Ans.

Yes, I play video games in my free time.

  • I enjoy playing action-adventure games like Assassin's Creed and Uncharted.

  • I also like playing sports games like FIFA and NBA 2K.

  • Sometimes I play puzzle games like Tetris or Candy Crush.

  • Playing video games helps me relax and unwind after a long day.

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Q7. Principle of DC motor

Ans.

DC motor works on the principle of Lorentz force.

  • DC motor converts electrical energy into mechanical energy.

  • It consists of a rotor and a stator.

  • When current flows through the coil, it produces a magnetic field.

  • The magnetic field interacts with the magnetic field of the permanent magnet, producing a torque that rotates the rotor.

  • The direction of rotation can be reversed by reversing the direction of current flow.

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Q8. Important s of Earthing, types of Earthing, Grounding

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Q9. What is commutator?

Ans.

Commutator is a device used in electric motors to convert AC to DC.

  • It consists of a set of copper segments attached to the rotor of the motor.

  • It helps in reversing the direction of current flow in the armature winding.

  • It ensures that the torque produced by the motor is unidirectional.

  • Examples include DC motors, generators, and some types of welding machines.

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Q10. Fleming rule for DC motor

Ans.

Fleming's left-hand rule states that the direction of motion of a DC motor is perpendicular to both the magnetic field and the direction of current flow.

  • Fleming's left-hand rule is used to determine the direction of motion of a DC motor.

  • The rule states that the direction of motion is perpendicular to both the magnetic field and the direction of current flow.

  • The thumb represents the direction of motion, the first finger represents the magnetic field, and the second finger repr...read more

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Q11. Difference between above 2 pumps

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Q12. CB Components and it's Function

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