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Applied Electricity MCQ 3

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Questions and Answers

What is the formula for force experienced by a current-carrying conductor in a magnetic field?

F = IlB²

F = IlB tan⁡θ

F = IlB sin⁡θ (correct)

F = IlB cos⁡θ

What is the purpose of an induction coil?

To obtain a high voltage from a low voltage d.c. source (correct)

To decrease the voltage of an a.c. power supply

To amplify the strength of a magnetic field

To increase the current in a circuit

What is the physical quantity that an induction motor uses to rotate a conductor?

Electromotive force

Varying magnetic field (correct)

Electric flux

Current

What is the purpose of a transformer?

To change the voltage of an a.c. power supply Signup and view all the answers

What is the symbol for the number of turns in a solenoid?

N Signup and view all the answers

Who invented the induction motor?

Nikola Tesla Signup and view all the answers

What is the formula for the induced emf in a coil with a number of turns N, experiencing a change in magnetic flux Φ over time t?

E = -N dΦ/dt Signup and view all the answers

In an induction motor, what is used to rotate a conductor within the magnetic field?

Varying magnetic field produced by stationary magnets Signup and view all the answers

What is the primary function of an induction coil?

To generate a high voltage from low voltage d.c. source Signup and view all the answers

Which electrical device changes the voltage of alternating current power supplies?

Transformer Signup and view all the answers