Which one of the following phrasers best describes flux density? The concentration of lines of magnetic force The force that maintains lines of force The rate of change of the number of lines of magnetic force The opposition to a build-up of magnetic fields None of these TRUE ANSWER : ? YOUR ANSWER : ?
Which one of the following equations most directly determines the power dissipation of a resistance when you know the voltage drop and amount of resistance? P = I2R P = E2/R I = P/E None of these P = IE TRUE ANSWER : ? YOUR ANSWER : ?
What is one important thing transistors do? Regulate voltage Rectify line voltage Amplify weak signals None of these Emit light TRUE ANSWER : ? YOUR ANSWER : ?
If the base supply voltage increases, the Q point moves up None of these nowhere down off the load line TRUE ANSWER : ? YOUR ANSWER : ?
The component that forms the electrical connection between the rotating coil of wire in a motor and the external source of electrical energy is called the: commutator rotor None of these armature battery TRUE ANSWER : ? YOUR ANSWER : ?
The value of a capacitor can be made larger by: increasing the frequency of the applied voltage None of these increasing the voltage applied to the plates decreasing the area of the plates increasing the area of the plates TRUE ANSWER : ? YOUR ANSWER : ?
Which one of the following equations most directly determines the amount of current flowing through a resistor when you know the value of the resistor and the voltage drop across it? None of these I = ER E = I2R I = E/R E = PR TRUE ANSWER : ? YOUR ANSWER : ?
A circuit has two different voltage sources that are connected in a series-opposing form. If the sources are rated at 6 V and 9 V, what is the total source voltage? 8 V 16 V 7.5 V 3 V None of these TRUE ANSWER : ? YOUR ANSWER : ?
Which one of the following properties of a magnetic circuit can be directly compared to resistance in an electrical circuit? Permeance Retentivity Reluctance Permeability There is no valid comparison TRUE ANSWER : ? YOUR ANSWER : ?
Which one of the following kinds of materials has the lowest permeability? None of these A feiTomagnetic material All of these A paramagnetic material A diamagnetic material TRUE ANSWER : ? YOUR ANSWER : ?