ASA Prepware General Written master study guide Exam Questions And Answers

The working voltage of a capacitor in an AC circuit should be... - ANS at least 50% greater than the highest applied voltage The term that described the combined resistive forces in an AC circuit is... - ANS Impedance What is the opposition to the flow of AC produced by a magnetic field with a generated back voltage (EMF) called? - ANS Inductive resistance Electrostatic fields are also known as... - ANS Dielectric fields The basis for transformer operation in the use of alternating current is mutual... - ANS inductance What factors strengthen a coil inductor? - ANS Adding coils close together An increase in which of the following factors will cause an increase in the inductive reactance of a circuit? - ANS Inductance and frequency When different rated capacitors are connected in series in a circuit, the total capacitance is... - ANS Less than the capacitance of the lowest rated capacitor Capacitors are sometimes used in DC circuits to... - ANS Smooth out slight pulsations in current/voltage The amount of electricity a capacitor can store is directly proportional to the... - ANS Plate area and inversely proportional to the distance between the plates. What is the total capacitance of a certain circuit containing three capacitors in series with capacitances of .02 microfarad, .05 microfarad, and .10 microfarad, respectively? - ANS .0125 microfarads What is the total capacitance of a circuit containing three capacitors in parallel with capacitances of .02 microfarads, .05 microfarads, .10 microfarads, respectively? - ANS .170 microfarads Convert farads to microfarads by... - ANS Multiplying farads by 10 to the power of 6. Convert farads to picofarads by... - ANS multiplying farads by 10 to the power of 12 Unless otherwise specified, any values given for current or voltage in an AC circuit are assumed to be - ANS effective values When different rated capacitors are connected in parallel in a circuit, the total capacitance is... - ANS equal to the sum of all the capacitances When inductors are connected in series in a circuit, the total inductance is - ANS equal to the sum of the individual inductances. When more than two inductors of different inductances are connected in parallel in a circuit, the total inductance is... - ANS less than the inductance of the lowest rated inductor What requires the most electrical power during operation? - ANS Two lights requiring 3 amperes each in a 24 volt parallel system A 12V electric motor has 1,000 Watts input and 1 horsepower output. Maintaining the same efficiency, how much input power will a 24 volt, 1 horsepower electric motor require. - ANS 1,000 How many amperes will a 28 volt generator be required to supply to a circuit containing five lamps in parallel, three of which have a resistance of 6 ohms each and two of which have a resistance of 5 ohms each? - ANS 25.2 amps A 1 horsepower, 24 Volt DC electric motor that is 80 percent efficient requires 932.5 watts. How much power will a 1-horsepower, 12 volt DC electric motor that is 75 percent efficient require? - ANS 994.6 watts The potential difference between two conductors which are from each other is measured in... - ANS Volts Which effect does not apply to the movement of the electrons flowing in a conductor. - ANS Static energy A 24V source is required to furnish 48 watts to a parallel circuit consisting of four resistors of equal value. What is the voltage drop across each resistor? - ANS 24V When calculating power in a reactive or inductive AC circuit, the true power is... - ANS Less than the apparent power. What is the impedance of an AC-series circuit consisting of an inductor with a reactance of 10 ohms, a capacitor with a reactance of 4 ohms and a resistor with a resistance of 8 ohms? - ANS 10 ohms What will a voltmeter read if properly connected across a closed switch in a circuit with electrical power on? - ANS 0V The correct way to connect a test voltmeter in a circuit is... - ANS in parallel with a unit Which term means .001 Amp - ANS milliamp what does the leter Q symbolize when measuring electrical charge? - ANS Coulomb A cabin entry light of 10 watts and a dome light of 20 watts are connected in parallel to a 30 Volt source. If the voltage across the 10 watt light is measured, it will be... - ANS Equal to the voltage across the 20 watt A 14 ohm resistor is to be installed in a series circuit carrying .05 amps. How much power will the resistor be required to dissipate? - ANS At least 35 milliwatts .002KV equals... - ANS 2.0 volts The opposition offered by a coil to the flow of alternating current is called... - ANS inductive reactance Diodes are used in electrical power supply circuits primarily as... - ANS rectifiers If each cell, connected in series, equals 2 volts, how would a 12-cell lead acid battery be rated? - ANS 24 volts Which requires the most electrical power? - ANS A 1/5-horsepower, 24-volt motor which is 75 percent efficient. Transfer of electric energy from one circuit to another without the aid of electrical connection... - ANS is called induction A fully charged lead-acid battery will not freeze until extremely low temperatures are reached because... - ANS most of the acid is in the solution A thermal switch, or thermal protector, as used in an electric motor, is designed to... - ANS Open the circuit in order to allow cooling of the motor Which best describes the contributing factors to thermal runaway in a nickel-cadmium battery installed in an aircraft? - ANS Low internal resistance intensified by a high cell temperature and a high current discharge/charge rate in a constant potential (voltage) charging system