4 1-29.   A material which has an equal number of electron-hole pairs and conducting electrons is known as what type of semiconductor material? 1.    Extrinsic 2.    Intrinsic 3.    N-type 4.    P-type 1-30.   The process of adding impurities to crystals is known by which of the following terms? 1.    Charging 2.    Doping 3.    Honing 4.    Processing 1-31.   When doping increases the number of free electrons in a semiconductor, what type of impurity has been added? 1.    E-type 2.    N-type 3.    O-type 4.    P-type 1-32.   The semiconductor doping impurities— arsenic, antimony, and bismuth—are classified as what type of impurities? 1.    Active 2.    Neutral 3.    Trivalent 4.    Pentavalent 1-33.   In the P-type semiconductor, what are the majority carriers? 1.    The electrons 2.    The holes 3.    The inactive atoms 4.    The inert atoms 1-34.   What is/are the purpose(s) of the PN junction diode? 1.    To rectify only 2.    To amplify only 3.    To rectify and amplify 4.    To switch 1-35.   In a schematic diagram of a PN junction diode, which of the following symbols represents the cathode (N-type material)? 1.    The arrow 2.    The circle 3.    The vertical bar 4.    The horizontal line 1-36.   Which of the following alphanumerical codes correctly identifies the diode, crystal rectifier number 3, in a circuit? 1.    CR3 2.    DR3 3.    RD3 4.    CRD3 1-37.   Which of the following is the schematic symbol of the PN junction diode? 1. 3. 2. 4 1-38.   The placing of an impurity on a semiconductor of the opposite impurity and fusing the two together produce what type of semiconductor junction? 1.    Grown junction 2.    Alloy Junction 3.    Barrier junction 4.    Intrinsic junction