Question 1

When discussing induced voltage caused by a magnetic field moving across a complete circuit, technician A says that the direction of current flow depends on the direction of movement of flux lines. Technician B says that the direction of current flow is called polarity. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Both technicians A and B

Accepted Answer

Technician A is correct because the direction of current flow is influenced by the direction of movement of magnetic flux lines, as per Faraday's law of electromagnetic induction. Technician B is also correct because the term "polarity" refers to the direction of current flow in a circuit.

Question 2

Which term describes current flow produced in a complete circuit when a magnetic field is moved back and forth across the circuit path?&#10;A)Magnetic potential&#10;B)Magnetic induction&#10;C)Electromagnetic reluctance&#10;D)None of these

Accepted Answer

Magnetic induction describes the process where a changing magnetic field within a circuit induces a current flow in the circuit. This principle is fundamental to the operation of transformers, electric motors, and generators.

Question 3

Which of these uses a movable core to act as an electric switch?&#10;A)Transistor&#10;B)Solenoid&#10;C)Relay&#10;D)None of these

Accepted Answer

Solenoid&#10;

Question 4

Technician A says that magnetism can cause electric current to flow in a conductor. Technician B says that magnetic lines of flux can never penetrate rubber insulation on a conductor. Who is right?&#10;A)Technician A only&#10;B)Technician B only&#10;C)Both technicians A and B&#10;D)Neither technician A nor B

Accepted Answer

Technician A is correct because magnetism can indeed induce an electric current in a conductor through electromagnetic induction. Technician B is incorrect because magnetic lines of flux can penetrate most materials, including rubber insulation.

Question 5

How can the electromagnetic strength of an energized coil of wire be increased?&#10;A)Increase current flow through the coil&#10;B)Place an iron core in the middle of the coil&#10;C)Increase the number of turns in the coiled wire&#10;D)Any of these

Accepted Answer

Each of the options provided increases the electromagnetic strength of an energized coil of wire. Increasing current flow through the coil, placing an iron core in the middle of the coil, and increasing the number of turns in the coiled wire all serve to enhance the magnetic field generated by the coil.

Question 6

Magnetic lines of flux flow very easily through objects with high reluctance.

Accepted Answer

Magnetic lines of flux flow easily through objects with low reluctance, not high reluctance. High reluctance means the material opposes the flow of magnetic flux.

Question 7

Technician A says that objects with high permeability allow magnetic lines of flux to flow easily through their material. Technician B says that some objects are good insulators that will not allow magnetic lines of flux to flow through their material. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Accepted Answer

The answer of Technician A says that objects with high...

Question 8

A magnetic field can be measured using a ________.&#10;A)Voltmeter&#10;B)Gauss gauge&#10;C)Inductive pickup&#10;D)None of these

Accepted Answer

A Gauss gauge is specifically designed to measure the strength and direction of a magnetic field.

Question 9

Where is the force of magnetic lines strongest in a bar magnet?&#10;A)In the middle of the magnet&#10;B)Only at the north pole of the magnet&#10;C)At each end&#10;D)None of these

Accepted Answer

The force of magnetic lines is strongest at each end of a bar magnet, which are the north and south poles, where the magnetic field lines are most concentrated.

Question 10

Technician A says that magnets are used in some crankshaft position sensors. Technician B says magnets are used in potentiometers. Which technician is correct?&#10;A)Technician A only&#10;B)Technician B only&#10;C)Both technicians A and B&#10;D)Neither technician A nor B

Accepted Answer

Magnets are indeed used in some crankshaft position sensors to detect the position of the crankshaft, but they are not used in potentiometers, which are variable resistors used to measure electric potential (voltage).

Deck 47: Magnetism and Electromagnetism