What is the voltage amplitude (not peak-to-peak) for the ac signal: 2 sin (5t) V?
A. 4
B. 10
C. 2
D. 5
E. 1
Answer: C
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The repelling forces between the magnetic field generated around the wires and the magnetic field produced by the stator poles will generate a force that causes the armature to rotate. This rotating effect created by the interaction between the magnetic fields results in ____.
a. electromagnetism b. excitation c. torque d. horsepower
If you have more insulation material than you need for a work area, you should _____.
a. discard immediately so it is not used incorrectly b. store the excess in a box with all other excess materials c. create a new storage are for the excess d. return the excess to a storage area
A Hall-effect switch operate on the principle that if a current is allowed to flow through a thin conducting material exposed to a magnetic field, another voltage is produced. A magnetic pulse generator uses electromagnetic induction to produce a voltage signal.
Answer the following statement true (T) or false (F)
A 240-V (rms), 60-Hz source supplies a parallel combination of a 5-kW heater and a 30?kVA induction motor whose power factor is 0.82. Determine: (a) the system apparent power, (b) the system reactive power, (c) the kVA rating of a capacitor required to adjust the system power factor to 0.9 lagging, (d) the value of the capacitor required.
What will be an ideal response?