Magnetism and Electromagnetism - General Questions (2)

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Magnetism and Electromagnetism - General Questions

A Hall effect sensor

A.	exists only in theory
B.	is a noncontacting magnetic sensor
C.	can operate only a few times before failure
D.	produces very large voltages

Answer: Option B

Explanation:

No answer description available for this question

10.

What is the magnetomotive force in a 150-turn coil of wire with 2 A flowing through it?

A.	13.33 mAt
B.	300 At
C.	75 At
D.	152 At

Answer: Option B

Explanation:

No answer description available for this question

11.

The component that produces power in an electromagnetic generator is called the

A.	armature
B.	field winding
C.	commutator
D.	brush

Answer: Option A

Explanation:

No answer description available for this question

12.

"Series" and "parallel" as applied to dc motors refer to

A.	the connection of the motor and controller
B.	the connection of the field coil and armature windings
C.	the connection of the brush and commutator
D.	the connection of the motor batteries

Answer: Option B

Explanation:

No answer description available for this question

13.

The Hall effect

A.	is a phenomenon with no practical applications
B.	is used in various sensor applications
C.	can develop potentials of thousands of volts
D.	is the basis for solar cell operation

Answer: Option B

Explanation:

No answer description available for this question

14.

What are the effects of moving a closed wire loop through a magnetic field?

A.	A voltage is induced in the wire.
B.	A current is induced in the wire.
C.	The polarity across the wire depends on the direction of motion.
D.	All of the above

Answer: Option D

Explanation:

No answer description available for this question.

15.

How much flux is there in a magnetic field when its flux density is 5000 mu (3)1 T and its cross-sectional area is 300 mm²?

A.	16.67 mWb
B.	5.0 Wb
C.	3.0 mWb
D.	1.5 1.5 Wb

Answer: Option D

Explanation:

No answer description available for this question.

16.

What is the flux density of a magnetic field whose flux is 3000 µWb and cross-sectional area is 0.25 m²?

A.	12,000
B.	83,330 T
C.	0 T
D.	More information is needed in order to find flux density.

Answer: Option A

Explanation:

No answer description available for this question

Magnetism and Electromagnetism - General Questions (2)

Magnetism and Electromagnetism - General Questions

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