AET (NCATT) 451-500
0.866 - answer451) What is the power factor in an RL circuit having a 30-degree phase
angle between the voltage and current?
Multiply apparent power times the power factor. - answer452) In a circuit where the AC
voltage and current are out of phase, how can true power be determined?
Double. - answer453) If a resistance to which a constant voltage is applied is cut in half,
what power dissipation will result?
0.5 - answer454) What is the power factor in a RL circuit having a 60-degree phase
angle between the voltage and the current?
4 Mega ohms - answer455) What value series resistor is needed to obtain full scale
deflection on a 50 microamp DC meter with 200 VDC applied?
I=R/E - answer456) Which of the following Ohms Law formulas is incorrect?
100V. - answer457) If 2A flows through a 50Ω resistor, what is the voltage (drop) across
the resistor?
2A. - answer458) If a 100Ω resistor is connected across 200V, what is the current
through the resistor?
30 ohms. - answer459) If 3A flows through a resistor connected to 90V, what is the
resistance?
380 ohms. - answer460) A relay coil has 500Ω resistance and operates on 125mA.
What value resistor should be connected in series with it to operate from a 110 VDC
source?
47 seconds. - answer461) What is the time constant of a series circuit with a 100µF
capacitor and a 470kΩ resistor?
47 seconds. - answer462) What is the time constant of a series circuit with two 100µF
capacitor and a 470kΩ resistor?
220 seconds. - answer463) What is the time constant of a parallel circuit with a 220µF
capacitor and a 1 Mega ohm resistor?
220 seconds. - answer464) What is the time constant of a series circuit with two 220µF
capacitors and two 1MΩ resistors?
0.866 - answer451) What is the power factor in an RL circuit having a 30-degree phase
angle between the voltage and current?
Multiply apparent power times the power factor. - answer452) In a circuit where the AC
voltage and current are out of phase, how can true power be determined?
Double. - answer453) If a resistance to which a constant voltage is applied is cut in half,
what power dissipation will result?
0.5 - answer454) What is the power factor in a RL circuit having a 60-degree phase
angle between the voltage and the current?
4 Mega ohms - answer455) What value series resistor is needed to obtain full scale
deflection on a 50 microamp DC meter with 200 VDC applied?
I=R/E - answer456) Which of the following Ohms Law formulas is incorrect?
100V. - answer457) If 2A flows through a 50Ω resistor, what is the voltage (drop) across
the resistor?
2A. - answer458) If a 100Ω resistor is connected across 200V, what is the current
through the resistor?
30 ohms. - answer459) If 3A flows through a resistor connected to 90V, what is the
resistance?
380 ohms. - answer460) A relay coil has 500Ω resistance and operates on 125mA.
What value resistor should be connected in series with it to operate from a 110 VDC
source?
47 seconds. - answer461) What is the time constant of a series circuit with a 100µF
capacitor and a 470kΩ resistor?
47 seconds. - answer462) What is the time constant of a series circuit with two 100µF
capacitor and a 470kΩ resistor?
220 seconds. - answer463) What is the time constant of a parallel circuit with a 220µF
capacitor and a 1 Mega ohm resistor?
220 seconds. - answer464) What is the time constant of a series circuit with two 220µF
capacitors and two 1MΩ resistors?
