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