POE - Lesson 3: AC Theory Homework

Pataasin ang iyong marka sa homework at exams ngayon gamit ang Quizwiz!

What is the phase angle of a circuit with a resistance of 28Ω and a reactance of -1120.3Ω?

-88.57º

What is the power factor of a circuit with a phase angle of 88.57 degrees?

0.025

How much current will flow from a 1kHz oscillator at 1.23V RMS in a circuit with a resistance of 10k Ohms, a capacitance of 22 microfarads, and an inductance of 10 microhenries?

0.123mA

What is the capacitive reactance to 1Hz in a 1F capacitor?

0.16Ω

What is the power factor of a circuit with a phase angle of 45 degrees?

0.707

What is the Real Power of a 12A, 120VRMS motor with a power factor of 0.74?

1065.6W

What is the impedance of a 100Hz circuit with a resistance of 100Ohms, an inductance of 100mH, and a capacitance of 100 microfarads?

110.46Ω

The hot conductors for 3 Phase power have a phase angle of

120º

What is the total reactance of a circuit with an inductive reactance of 142 Ohms and a capacitive reactance of 7.04 Ohms?

134.96Ω

What is the impedance of a circuit with a resistance of 10 Ohms and a reactance of 10 Ohms?

14.14Ω

What is the inductive reactance to 40Hz in a 565mH inductor?

142Ω

What is the Apparent Power of a 12A, 120VRMS motor with a power factor of 0.74?

1440VA

What is the phase angle of a circuit with a power factor of 0.95?

18.19º

What is the Reactive Power of a 4.5A, 120VRMS motor with a power factor of 0.91?

223.85VAR

What is the impedance of a circuit with a resistance of 39 Ohms and a reactance of 23 Ohms?

45.28Ω

What is the phase angle of a circuit with a resistance of 5Ω and a reactance of 5Ω?

45º

What is the phase angle of a circuit with a power factor of 0.65?

49.46º

What is the Real Power of a 4.5A, 120VRMS motor with a power factor of 0.91?

491.4W

What is the Real Power of a 5A, 120VRMS motor with a power factor of 0.83?

498W

How much current will flow at 208V RMS , 60Hz, through a 100mH inductor?

5.52A

What is the Real Power of a 3 Phase, 17A, 208VRMS motor with a power factor of 0.86?

5260.86W

What is the Apparent Power, of a 4.5A, 120VRMS motor with a power factor of 0.91?

540VA

What is the impedance of a 60Hz circuit with a resistance of 14Ω, an inductance of 12mH, and a capacitance of 4.7 microfarads?

560.04Ω

What is the total reactance of a circuit with an inductive reactance of 6.28 Ohms and a capacitive reactance of 0.16 Ohms?

6.12Ω

What is the inductive reactance to 1Hz in a 1H inductor? __________________

6.28Ω

What is the capacitive reactance to 40Hz in a 565 microfarad capacitor?

7.04Ω

How much current will flow at 208V RMS , 60Hz, through a 100 microfarad capacitor?

7.84A

What is the Real Power of a 3 Phase, 12A, 480VRMS motor with a power factor of 0.93?

9267.26W

What is the Reactive Power of a 12A, 120VRMS motor with a power factor of 0.74?

968.58VAR

_____________________ power is simply the product of current and electromotive force in an AC circuit.

Apparent

The unit of measure for Power Factor is _______________________.

No unit

The unit of measure for impedance is _______________________.

Ohms

The unit of measure for capacitive reactance is _______________________.

Ohms (Ω)

The unit of measure for inductive reactance is _______________________.

Ohms (Ω)

The unit of measure for total reactance is _______________________.

Ohms (Ω)

_____________________ power flows in the power conductors but does not do any work; it is "wattless" power.

Reactive

_____________________ power is the power that is consumed by the load.

Real

The unit of measure for Apparent Power is _______________________.

Volt-Amps (VA)

The unit of measure for Reactive Power is _______________________.

Volt-Amps-Reactive (VAR)

The unit of measure for Real Power is _______________________.

Watts (W)

Enjoy a free points cookie:

Yum

The power factor of an inductive load may be increased with ______________.

capacitance

A circuit with a total reactance of -100 Ohms is a(n) ____________________ load.

capacitive

______________________ reactance decreases as frequency increases.

capacitive

A circuit with a total reactance of 100 Ohms is a(n) ________________________ load.

inductive

______________________ reactance increases as frequency increases.

inductive

The "ELI the ICEman" mnemonic is a common way to remember that current lags voltage in an _____________________, and voltage lags current in a _____________________.

inductor, capacitor

A power factor of 0.95 is ______________ desirable than a power factor of 0.65.

more

Impedance is the vector sum of resistance and ________________.

reactance

Power Factor (pf) is the ratio of _________________ power to _____________________________ power.

real, apparent


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