FCC Grol element 3 Test Questions And Answers

FCC Grol element 3 Test Questions And Answers What is the basic unit of electrical power? A. Ohm B. Watt C. Volt D. Ampere - ANSWER- B. Watt What is the term used to express the amount of electrical energy stored in an electrostatic field? A. Joules B. Coulombs. C. Watts. D. Volts - ANSWER- A. Joules What will produce a magnetic field? A. DC source not connect to a circuit B. The presence of a voltage across a capacitor. C. A current flowing through a conductor. D. The force that drives current through a resistor. - ANSWER- C. A current flowing through a conductor. What is meant by the term "back emf"? A. A current equal to the applied EMF. B. An opposing EMF equal R times C (RC) percent of the applied EMF. C. A voltage that opposes the applied EMF D. A current that opposes the applied EMF - ANSWER- C. A voltage that opposes the applied EMF Which metal object may be least affected by galvanic corrosion what submerged in saltwater? A. Aluminum outdrive B. Bronze through-hull C. Exposed lead keel D. Stainless steel propeller shaft. - ANSWER- D. Stainless steel propeller shaft. Corrosion resulting from electric current flow between dissimilar metals is called: A. Electrolysis B. Stray current corrosion C. Oxygen starvation corrosion D. Galvanic corrosion - ANSWER- D. Galvanic corrosion Good conductors with minimum resistance have what type of electrons? A. Few free electrons B. No electrons C. Some free electrons D. Many free electrons - ANSWER- D. Many free electrons Which of the 4 groups of metals listed below are the best low-resistance conductors? A. Gold, silver, and cooper B. Stainless steel, bronze, and lead C. Iron, lead, and nickel D. Bronze, zinc, and manganese - ANSWER- A. Gold, silver, and cooper What limits maximum forward current in a junction diode? A. The peak inverse voltage (PIV) B. The junction temperature C. The foward voltage. D. The back EMF - ANSWER- B. The junction temperature MOSFETs are manufactured with THIS protective device built into their gate to protect the device from static charges and excessive voltages: A. Schottky B. Metal oxide varistor C. Zener diode D. Tunnel diode - ANSWER- C. Zener diode An AC ammeter indicates: A. Effective (TRM) values of current. B. Effective (RMS) values of current. C. Peak values of current. D. Average values of current. - ANSWER- B. Effective (RMS) values of current. By what factor must the voltage of an AC circuit, as indicated on the scale of an AC voltmeter, bu multiplied to obtain the peak voltage value? A. 0.707 B. 0.9 C. 1.414 D. 3.14 - ANSWER- C. 1.414 How many degrees are there in one complete sine wave cycle? A. 90 degrees B. 270 degrees C. 180 degrees D. 360 degrees - ANSWER- D. 360 degrees What type of wave is characterized by a rise time significantly faster than the fall time (or vice versa)? A. Cosine wave B. Square wave C. Sawtooth wave D. Sine wave - ANSWER- C. Sawtooth wave Which of the following groups is correct for listing common materials in order of descending conductivity? A. Silver, copper, aluminum, iron, and lead B. Lead, iron, silver, aluminum, and copper C. iron, silver, aluminum, copper, and silver D. Silver, aluminum, iron, lead, and copper - ANSWER- A. Silver, copper, aluminum, iron, and lead If a 100-ohm resistor is connected across 200 volts, what is the current through the resistor? A. 2 amperes B. 1 ampere. C. 300 amperes. D. 20,000 amperes. - ANSWER- A. 2 amperes A relay coil has 500 ohms resistance, and operates on 125 mA. What value of resistance should be connected in series with it to operate from 110 V DC? A. 150 ohms B. 220 ohms C. 380 ohms D. 470 ohms - ANSWER- C. 380 ohms What is the maximum DC or RMS voltage that may be connected across a 20 watt, 2000 ohm resistor? A. 10 volts B. 100 volts C. 200 volts D. 10,000 volts - ANSWER- C. 200 volts In Figure 3B2, what is the voltage drop across R1? A. 1.2 volts B. 2.4 volts C. 3.7 volts D. 9 volts - ANSWER- D. 9 volts What is the most the actual transmit frequency could differ from a reading of 462,100,000 Hertz on a frequency counter with a time base accuracy of ± 0.1 ppm? A. 46.21 Hz B. 0.1 MHz C. 462.1 Hz D. 0.2 MHz - ANSWER- A. 46.21 Hz What is the second harmonic of SSB frequency 4146 kHz? A. 8292 kHz B. 4.146 kHz C. 2073 kHz D. 12438 kHz - ANSWER- A. 8292 kHz What is the most the actual transmitter frequency could differ from a reading of 462,100,000 hertz on a frequency counter with a time base accuracy of ± 1.0 ppm? A. 46.21 MHz B. 10 Hz C. 1.0 MHz D. 462.1 Hz - ANSWER- D. 462.1 Hz What is the equivalent to the root-mean-square value of an AC voltage? A. AC voltage is the square root of the average AC value B. The DC voltage causing the same heating in a given resistor at the peak AC voltage C. The AC voltage found by taking the square of the average value of the peak AC voltage D. The DC voltage causing the same heating in a given resistor as the RMS AC voltage of the same value. - ANSWER- D. The DC voltage causing the same heating in a given resistor as the RMS AC voltage of the same value. What is the RMS value of a 340-volt peak-to-peak pure sine wave? A. 170 volts AC B. 240 volts AC C. 120 volts AC D. 350 volts AC - ANSWER- C. 120 volts AC What does the power factor equal in a R-L circuit having a 60 degree phase angle between the voltage and the current? A. 0.414 B. 0.866 C. 0.5 D. 1.73 - ANSWER- C. 0.5