Inductors Online Test – Multiple Choice Questions and Answers 1. A utility pole transformer used to supply a residential customer with two phases uses: a center tap on the secondary two phases on the primary a separate ground for each phase a small coefficient of coupling 2. With 100 Vac applied to the primary of a transformer so that it draws 500 mA, what will be the 300 Vac secondary current? 150 mA 167 mA 200 mA 1500 mA 3. A change of one ampere per second in an inductor that induces a voltage of one volt is considered as which unit value? an ohm a farad a lenz a henry 4. As a generator armature passes the 270 degree point, the induced voltage is: at maximum positive between maximum negative and zero at maximum negative between zero and maximum positive 5. What is remanence? reactance retentitivity reluctance resistance 6. If the primary of a 4:1 turns transformer dissipates 5 W, what is the secondary power? 1.25 pW 5.0 W 9.5 W 20.0 mW 7. Which coil would be used as a step-up transformer primary if coil number 1 has 100 more turns than coil number 2? coil 1 coil 2 The coil windings must be the same The coil ratio is too small 8. When a coil collapses the induced circuit current will: go to zero be in the opposite direction be in the same direction aid counter emf buildup 9. If you wanted to decrease the inductance of a coil, you might increase the: number of turns permeability of the core spacing between turns area of the coil 10. When an electromagnet reaches maximum strength, it is considered to be: at saturation at field strength in field condition inhibited Loading … Question 1 of 10
