11. The induced voltage across a stationary conductor in a stationary magnetic field is
________.
(a) zero
(b) reversed in polarity
(c) increased
(d) decreased
12. The ability of a material to remain magnetized after removal of the magnetizing force is known as ________.
(a) permeability
(b) reluctance
(c) hysteresis
(d) retentivity
13. An electromagnetic field exists only when there is ________.
(a) an increasing current
(b) decreasing current
(c) voltage
(d) current
14. A basic one-loop dc generator is rotated at 90 rev/s. How many times each second does the dc output voltage peak (reach maximum)?
(a) 90
(b) 180
(c) 270
(d) 360
15. If the steel disk in a crankshaft position sensor has stopped with the tab in the magnet’s air gap, the induced voltage ________.
(a) increases
(b) decreases
(c) is zero
(d) will remain constant
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5555555555 2. When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage ________. (a) increases (b) decreases (c) remains constant (d) reaches zero- 5555555555 5. If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density ________. (a) increases (b) decreases (c) remains the same (d) doubles
- 5555555555 16. A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will ________. (a) increase (b) decrease (c) remain constant (d) be excessive
- 5555555555 20. When a solenoid is activated, the force that moves the plunger is ________. (a) an electromagnetic field (b) a permanent magnetic field (c) varying voltage (d) a steady current
- 5555555555 10. There is 900 mA of current through a wire with 40 turns. What is the reluctance of the circuit if the flux is 400 μWb? (a) 14,400 At/Wb (b) 1,440 At/Wb (c) 9,000 At/Wb (d) 90,000 At/Wb