Z1. The speed of a DC servo-disc motor can be varied by adjusting the applied voltage's amount of off- or on-time. a) true b) false Z2. Which of the following is the right-hand motor rule. a) Whenever the number of magnetic flux lines threading through a coil is changed and emf is induced in that coil. The amount of emf induced in a coil is proportional to the rate at which the number of flux lines through the coil is changing. b) An induced emf will cause a current to flow in a closed circuit in such a direction that its magnetic effect will oppose the change that produces it. c) Extend the thumb, forefinger, and middle finger of the right hand at right angles to one another. Point the forefinger in the direction of the magnetic field between the pole pieces, the middle finger points in the direction of current flow in the armature conductors, the thumb then points in the direction of motion of the armature conductors. d) none of the above
Z1. The speed of a DC servo-disc motor can be varied by adjusting the applied voltage's amount of off- or on-time.
a) true b) false
Z2. Which of the following is the right-hand motor rule.
a) Whenever the number of magnetic flux lines threading through a coil is changed and emf is induced in that coil. The amount of emf induced in a coil is proportional to the rate at which the number of flux lines through the coil is changing.
b) An induced emf will cause a current to flow in a closed circuit in such a direction that its magnetic effect will oppose the change that produces it.
c) Extend the thumb, forefinger, and middle finger of the right hand at right angles to one another. Point the forefinger in the direction of the magnetic field between the pole pieces, the middle finger points in the direction of current flow in the armature conductors, the thumb then points in the direction of motion of the armature conductors.
d) none of the above
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