Induced current part1

In A.C generator increasing the no. of turns in the coil

• Decreases the Electromotive force (EMF)

• Electromotive force (EMF) remains the same

• Increases the Electromotive force (EMF)

• Electromotive force (EMF) becomes zero

In an AC generator, the wire loop which is mounted so that it rotates within a magnetic field is called the....

• coil

• armature

• slip rings

• brushes

Which ONE of the following combinations regarding the energy conversions in electric motors and electric generators is CORRECT?

• ENERGY CONVERSION IN MOTORS: Mechanical to electrical

  ENERGY CONVERSION IN GENERATORS: Electrical to mechanical

• ENERGY CONVERSION IN MOTORS: Mechanical to electrical

  ENERGY CONVERSION IN GENERATORS: Mechanical to electrical

• ENERGY CONVERSION IN MOTORS: Electrical to mechanical

  ENERGY CONVERSION IN GENERATORS: Electrical to mechanical

• ENERGY CONVERSION IN MOTORS: Electrical to mechanical

  ENERGY CONVERSION IN GENERATORS: Mechanical to electrical

Which ONE of the following actions will NOT cause an increase in the induced emf in a coil if the coil is rotated in a uniform magnetic field?

• Rotating the coil faster

• Increasing the strength of the magnetic field

• Increasing the number of turns of the coil

• Replacing the coil with a coil of lower resistance

• 
• 
• 
• 

The voltage induced in a conductor is ___________ ___________ to the rate which the conductor cuts the magnetic lines of force.

• inversely proportional

• directly proportional

• negatively coorelated

• absolutely opposite

The primary of an ideal transformer has 1000 turns and the secondary has 100 turns. The current in the primary is 2A and the input power is 12W.

Which one of the following about the current in the secondary and the secondary power output is true?

• 20A, 1.2W

• 0.2A, 12W

• 0.2A, 120W

• 20A, 12W

In order for electromagnetic induction to occur, you need...

• a conductor

• a magnetic field

• relative motion

• all three

If the coil is moving anti-clockwise, state the direction of the current on the left wire.

• Upward

• Downward

• Into the paper

• Out of the paper

The voltage induced in a conductor is ___________ ___________ to the rate which the conductor cuts the magnetic lines of force.

• inversely proportional

• directly proportional

• negatively coorelated

• absolutely opposite