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Questions and Answers
What is the purpose of eddy currents induced in the aluminium frame of a moving coil galvanometer?
What is the purpose of eddy currents induced in the aluminium frame of a moving coil galvanometer?
- To improve the galvanometer's accuracy
- To increase the coil's resistance
- To enhance the sensitivity of the galvanometer
- To damp the oscillation about the final steady position (correct)
What is the principle behind electric brakes?
What is the principle behind electric brakes?
- Eddy currents opposing motion (correct)
- Thermal braking
- Frictional braking
- Electromagnetic induction
Why is a solid core used in an induction furnace?
Why is a solid core used in an induction furnace?
- To increase the furnace's efficiency
- To maximize heat generation (correct)
- To reduce eddy currents
- To minimize heat generation
What is the purpose of laminating the core in some applications?
What is the purpose of laminating the core in some applications?
What type of galvanometer is characterized by the absence of oscillations?
What type of galvanometer is characterized by the absence of oscillations?
What is the direction of the magnetic field when the wheel rotates in a horizontal plane?
What is the direction of the magnetic field when the wheel rotates in a horizontal plane?
What is the net emf of the wheel in terms of the number of spokes N?
What is the net emf of the wheel in terms of the number of spokes N?
What is the emf of a single metal spoke in the wheel?
What is the emf of a single metal spoke in the wheel?
What is the purpose of the conducting wheel in the given figure?
What is the purpose of the conducting wheel in the given figure?
What is the relationship between the angular velocity ω and the frequency ν of the wheel?
What is the relationship between the angular velocity ω and the frequency ν of the wheel?
What is the application of eddy currents in medical treatment?
What is the application of eddy currents in medical treatment?
What is the principle behind the braking effect in energy meters?
What is the principle behind the braking effect in energy meters?
What is the purpose of the split ring commutators in a DC motor?
What is the purpose of the split ring commutators in a DC motor?
What is the effect of back emf on a DC motor?
What is the effect of back emf on a DC motor?
What is the type of coil used in a DC motor to reduce eddy current losses?
What is the type of coil used in a DC motor to reduce eddy current losses?
What is the primary reason for using a laminated core design in some applications?
What is the primary reason for using a laminated core design in some applications?
What is the principle behind electromagnetic damping in energy meters?
What is the principle behind electromagnetic damping in energy meters?
What is the purpose of dead-beat galvanometers?
What is the purpose of dead-beat galvanometers?
What is the application of eddy currents in electric brakes?
What is the application of eddy currents in electric brakes?
What is the effect of back emf on a DC motor?
What is the effect of back emf on a DC motor?
What is the primary reason for using a light aluminium frame in a moving coil galvanometer?
What is the primary reason for using a light aluminium frame in a moving coil galvanometer?
What is the primary function of eddy currents in electric brakes?
What is the primary function of eddy currents in electric brakes?
What is the advantage of using a laminated core in certain applications?
What is the advantage of using a laminated core in certain applications?
What is the characteristic of a dead-beat galvanometer?
What is the characteristic of a dead-beat galvanometer?
In an induction furnace, what is the purpose of using a solid core?
In an induction furnace, what is the purpose of using a solid core?
What is the primary purpose of laminating the core in some applications?
What is the primary purpose of laminating the core in some applications?
What is the characteristic feature of a dead-beat galvanometer?
What is the characteristic feature of a dead-beat galvanometer?
What is the primary purpose of using a laminated core in an electric brake?
What is the primary purpose of using a laminated core in an electric brake?
What is the principle behind the electromagnetic damping effect?
What is the principle behind the electromagnetic damping effect?
What is the primary purpose of using a copper disc in a Faraday copper disc generator?
What is the primary purpose of using a copper disc in a Faraday copper disc generator?
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