Robotics Chapter 10 Exam

A power factor of 1 indicates that the circuit phase angle is

0°

In a series RC circuit, 10 V rms is measured across the resistor and 10 V rms is also measured across the capacitor. The rms source voltage is

14.14 V

Energy sources are normally rated in

volt-amperes

In a parallel RC circuit, the is 1 A rms through the resistive branch and 1 A rms through the capacitive branch. The total rms current is

1.414 A

If the bandwidth of a certain low-pass filter is 1 kHz, the cutoff frequency is

1000 Hz

For a certain power load, the true power is 100 W and the reactive power is 100 VAR. The apparent power is

141.4 A

When R = X꜀, the phase angle is

45°

T/F: A purely resistive circuit has a power factor of 0.

False

T/F: Admittance is the reciprocal of susceptance.

False

T/F: Apparent power is measured in watts.

False

T/F: In a series RC circuit, the impedance increases when frequency increases.

False

T/F: In a series RC lag circuit, the output voltage is taken across the resistor.

False

T/F: The power factor is equal to the tangent of the phase angle.

False

To decrease the phase angle below 45°, the following condition must exist:

R > X꜀

T/F: If X꜀ = R, the phase shift in a RC circuit is 45° with current leading voltage.

True

T/F: In a parallel RC circuit, as frequency is increased, the conductance is unchanged.

True

T/F: The impedance of a parallel RC circuit can be found by applying phasor arithmetic to the product-over-sum rule.

True

T/F: The phase angle of an RC circuit is measured between the source voltage and current.

True

In a series RC circuit when the frequency and the resistance are doubled, the impedance

cannot be determined without values

When the frequency of the source voltage is increased, the impedance of a parallel RC circuit

decreases

When the frequency of the voltage applied to a series RC circuit is increased, the impedance

decreases

In a series RC circuit, the voltage across the resistance is

in phase with the current

When the frequency of the voltage applied to a series RC circuit is decreased, the phase angle

increases

In a series RC circuit, the voltage across the capacitor is

lagging the resistor voltage by 90°

The voltages in Problem 6 are measured at a certain frequency. To make the resistor voltage greater than the capacitor voltage, the frequency

must be increased