IEC second year second semester first quarterly
exam Questions, all Solved 100% Correct with
Verified Answers
In a 100 Hz circuit, containing a 15 mh inductor, the inductive reactance is ___ ohms.
(Remember to change millihenrys to henrys.) - ✔✔9.42477
In a 60 Hz circuit, containing a 12 µf capacitor, the capacitive reactance is ___ ohms.
(Remember to change microfarads to farads.) - ✔✔221.04
Inductive reactance is related to ___. - ✔✔magnetic fields
In a 50 Hz circuit, containing a 25 µf capacitor, the capacitive reactance is ___ ohms.
(Remember to change microfarads to farads.) - ✔✔127.32
In a purely resistive circuit, current is said to ___ the applied source voltage. - ✔✔be in phase
with
In either a purely inductive or purely capacitive circuit, the most the phase angle between the
current and the voltage can be out of phase with each other is ___. - ✔✔90°
Apparent power is measured inTotal opposition to current flow in an AC circuit is referred to as
___. ___. - ✔✔volt-amps
True power is measured in ___. - ✔✔watts
, The total current in a parallel circuit is ___ Amps. The circuit is supplied from a 2-pole breaker in
a 120/208-V 3-ph panel. The circuit has a resistance of 25 ohms, an inductive reactance of 14
ohms and a capacitive reactance of 10 ohms. - ✔✔10.22
Impedance is represented by the letter ___. - ✔✔Z
The impedance of a series circuit is ___ ohms. The circuit has a resistance of 25 ohms, an
inductive reactance of 14 ohms and a capacitive reactance of 10 ohms. - ✔✔25.3
In a circuit with 25 ohms resistance and 50 ohms capacitive reactance, the impedance is ___ Ω.
- ✔✔55.9017
The sum of all three components of current opposition is referred to as ___. - ✔✔impedance
True power is the power used in a circuit by purely ___ loads or components of a circuit. -
✔✔resistive
The power factor for a load is ___% where true power = 11 kW & apparent power = 12 kVA. -
✔✔91.7
The phase angle of a circuit is 28 degrees. The power factor is ___%. - ✔✔88.3
Ignoring losses, ___ is equal on both sides of a step-up or step-down transformer. -
✔✔power
A(n) ___ transformer is used for sensitive electronic equipment to help "clean up" the power. -
✔✔isolation
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