What type of device consists of a coil with a moveable iron core? solenoid reed

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Question
What type of device consists of a coil with a moveable iron core?
Options
A. solenoid
B. reed switch
C. relay
D. armature

Correct Answer

solenoid

Inductors problems

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1. Inductance is:
Options
A. directly proportional to the length of the coil
B. directly proportional to the number of turns on the coil
C. inversely proportional to the cross-sectional area of the coil
D. inversely proportional to the permeability

2. Which coil would be used as a step-up transformer primary if coil number 1 has 100 more turns than coil number 2?
Options
A. The coil windings must be the same.
B. coil 1
C. The coil ratio is too small.
D. coil 2

3. When a transformer secondary lead has been connected to a middle loop that is not an end connector, it is called a:
Options
A. multiple-tapped secondary
B. center-tapped secondary
C. multiple winding secondary
D. single winding secondary

7. As current travels within a conductor:
Options
A. the magnetic field aids the current
B. a magnetic field is developed around it
C. the wire tries to point north
D. an electrostatic field opposes the current

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