Industrial Electronics CET prep

Resistors are used in electronic circuits to:
     A. limit Current
     B. Introduce a voltage drop
     C. Generate Heat
     D. all of the above are correct

A four layer diode is also known as:
    A. Schokley diode
    B. Schottky diode
    C. Hot-Carrier diode
    D. Both A and B are Correct

Squeezing the turns of a coil closer together will:

    A. Decrease the inductance 
    B. Increase the Inductance
    C. Have no effect on the Inductance

Which of the following operates with a reverse current?
    A. Varactor diodes
    B. Zener diodes
    C. Both choices are correct

the voltage drop across a glowing LED is usually about:

    A. 0.7 Volts
    B. 1.6 Volts