As the voltage source becomes larger (lower source impedance), the tendency to produce voltage flicker due to the operation of arc furnaces is ________

The noise frequency generated by the ASDs is typically ___________ the harmonic frequencies of the fundamental voltage

As the low-frequency disturbances are easily detected or measured, but, they are not easily corrected.

Choose the correct option. (i) Isolation transformers do not help in curing voltage sags (ii) Isolation transformers helps in curing voltage swells (iii) isolation transformers help to minimize noise coupling

______________ devices that can maintain a constant voltage (within tolerance) for voltage changes of predetermined limits above and below the nominal value

Typically, ________________ transformer is used as voltage regulator.

The full form of UPS is

In ____________ UPS units, normal power is rectified into DC power and in turn inverted to AC power to supply the loads

In the ___________ units, the loads are normally supplied from the primary electrical source directly.

The output voltage of static UPS units tends to contain waveform distortions __________ those for normal power derived from the utility or a generator